CN113036371A

CN113036371A - Filter and communication equipment

Info

Publication number: CN113036371A
Application number: CN201911361427.3A
Authority: CN
Inventors: 钟志波; 杨绍春; 李炳才; 刘建伟
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2021-06-25

Abstract

The application discloses wave filter and communication equipment, this wave filter includes: a housing having a first direction and a second direction; the first filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled, and the nine filtering cavities further form four first cross-coupling zero points; the second filtering branch consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three second cross coupling zeros; the third filtering branch consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three third cross-coupling zeros; the first filtering branch, the second filtering branch and the third filtering branch are sequentially arranged along the first direction. By the mode, the first filtering branch, the second filtering branch and the third filtering branch are sequentially arranged along the first direction, so that the layout is convenient and the size of the filter is reduced; and the out-of-band rejection and other performances of the filter are improved through the coupling zero point, and the high isolation among different channels is met.

Description

Filter and communication equipment

Technical Field

The present application relates to the field of communications technologies, and in particular, to a filter and a communications device.

Background

In a mobile communication system, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth. And should also consider maintaining high isolation between the passbands of the channels if both transmit and receive channels are present.

The inventor of the present application finds, in long-term research and development work, that in the prior art, two or more groups of filtering branches with different frequencies are generally combined into a filter, but in order to meet different design parameter requirements, the number, coupling mode and specific arrangement mode of resonant cavities of different filtering branches of the filter are not completely the same, which causes a problem that the size of the existing filter is too large, and particularly when a plurality of filtering branches are involved and a plurality of cross-coupling zeros are provided, the problem is serious.

Disclosure of Invention

The technical problem that this application mainly solved provides a wave filter and communication equipment to solve above-mentioned problem.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes a housing having a first direction and a second direction perpendicular to the first direction; the first filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled, and the nine filtering cavities further form four first cross-coupling zero points; the second filtering branch consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three second cross coupling zeros; the third filtering branch consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three third cross-coupling zeros; the first filtering branch, the second filtering branch and the third filtering branch are sequentially arranged along the first direction. The first, second and third filtering branches are sequentially arranged along the first direction, so that the layout is convenient and the size of the filter is reduced; and the out-of-band rejection and other performances of the filter are improved through the coupling zero point, and the high isolation among different channels is met.

Further, the nine filter cavities of the first filter branch are divided into three columns arranged along the second direction; the first filtering cavity of the first filtering branch, the second filtering cavity of the first filtering branch, the sixth filtering cavity of the first filtering branch and the seventh filtering cavity of the first filtering branch are in a row and are sequentially arranged along a first direction; the third filter cavity of the first filter branch, the fifth filter cavity of the first filter branch and the eighth filter cavity of the first filter branch are in a row and are sequentially arranged along a first direction; the fourth filter cavity of the first filter branch and the ninth filter cavity of the first filter branch are in a row and are arranged along a first direction; the fifth filter cavity of the first filter branch is respectively adjacent to the second filter cavity of the first filter branch, the third filter cavity of the first filter branch, the fourth filter cavity of the first filter branch, the sixth filter cavity of the first filter branch, the eighth filter cavity of the first filter branch and the ninth filter cavity of the first filter branch. The gaps between the filter cavities can be further reduced through the adjacent arrangement, and the size of the filter is further reduced.

Furthermore, inductive cross coupling is respectively performed between the first filter cavity of the first filter branch and the third filter cavity of the first filter branch, between the fifth filter cavity of the first filter branch and the eighth filter cavity of the first filter branch, capacitive cross coupling is respectively performed between the third filter cavity of the first filter branch and the fifth filter cavity of the first filter branch, and between the sixth filter cavity of the first filter branch and the eighth filter cavity of the first filter branch, so that four first cross coupling zeros are formed. Zero point suppression is realized through the coupling zero point, and high isolation among different channels is met.

Furthermore, eight filter cavities from the first filter cavity of the second filter branch to the fifth filter cavity of the second filter branch and eight filter cavities of the third filter branch are divided into four rows arranged along the second direction; the second filter cavity of the third filter branch, the second filter cavity of the second filter branch and the first filter cavity of the second filter branch are in a row and are sequentially arranged along a first direction, and the second filter cavity of the third filter branch and the second filter cavity of the second filter branch are arranged at intervals; the first filter cavity of the third filter branch, the third filter cavity of the second filter branch and the fourth filter cavity of the second filter branch are in a row and are sequentially arranged along a first direction, and the third filter cavity of the third filter branch and the third filter cavity of the second filter branch are arranged at intervals; the fourth filter cavity of the third filter branch, the seventh filter cavity of the third filter branch and the fifth filter cavity of the second filter branch are in a row and are sequentially arranged along the first direction, and the seventh filter cavity of the third filter branch and the fifth filter cavity of the second filter branch are arranged at intervals; the fifth filter cavity of the third filter branch, the sixth filter cavity of the third filter branch and the eighth filter cavity of the third filter branch are in a row and are sequentially arranged along the first direction; the sixth filter cavity of the second filter branch is far away from the third filter cavity of the second filter branch along a second direction relative to the fifth filter cavity of the second filter branch, so that an included angle between the center of the sixth filter cavity of the second filter branch and the center connecting line of the fifth filter cavity of the second filter branch, and an included angle between the center of the third filter cavity of the second filter branch and the center connecting line of the fifth filter cavity of the second filter branch are acute angles; the sixth filtering cavities of the second filtering branch and the eighth filtering cavities of the second filtering branch are in a row and are sequentially arranged along the first direction; the seventh filter cavity of the second filter branch is respectively adjacent to the fourth filter cavity of the second filter branch, the sixth filter cavity of the second filter branch and the eighth filter cavity of the second filter branch; a third filter cavity of the second filter branch is respectively adjacent to a first filter cavity of the second filter branch, a second filter cavity of the second filter branch, a fourth filter cavity of the second filter branch and a fifth filter cavity of the second filter branch; the first filter cavity of the third filter branch is respectively adjacent to the second filter cavity of the third filter branch, the third filter cavity of the third filter branch and the fourth filter cavity of the third filter branch, and the sixth filter cavity of the third filter branch is respectively adjacent to the fourth filter cavity of the third filter branch, the fifth filter cavity of the third filter branch, the seventh filter cavity of the third filter branch and the eighth filter cavity of the third filter branch. The gaps between the filter cavities can be further reduced through the adjacent arrangement, and the size of the filter is further reduced.

Furthermore, inductive cross coupling is respectively performed between a first filtering cavity of the second filtering branch and a third filtering cavity of the second filtering branch and between a third filtering cavity of the second filtering branch and a fifth filtering cavity of the second filtering branch, and capacitive cross coupling is performed between a sixth filtering cavity of the second filtering branch and an eighth filtering cavity of the second filtering branch to form three second cross coupling zeros; and the first filtering cavity of the third filtering branch and the third filtering cavity of the third filtering branch as well as the fourth filtering cavity of the third filtering branch and the sixth filtering cavity of the third filtering branch are respectively in inductive cross coupling, and the sixth filtering cavity of the third filtering branch and the eighth filtering cavity of the third filtering branch are in capacitive cross coupling to form three third cross coupling zeros. Zero point suppression is realized through the coupling zero point, and high isolation among different channels is met.

The beneficial effects of the embodiment of the application are that: different from the prior art, the filter is convenient to arrange and further reduces the size of the filter by arranging the first, second and third filtering branches along the first direction in sequence; and the out-of-band rejection and other performances of the filter are improved through the coupling zero point, and the high isolation among different channels is met.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a first embodiment of a filter according to the present application;

fig. 2 is a schematic diagram of a topology of a first filtering branch of a filter provided in the present application;

fig. 3 is a schematic diagram of a topology of a second filtering branch of the filter provided in the present application;

fig. 4 is a schematic diagram of a topology of a third filtering branch of the filter provided in the present application;

FIG. 5 is a schematic diagram of a second embodiment of a filter provided herein;

fig. 6 is a schematic diagram of a topology of a fourth filtering branch of the filter provided in the present application;

fig. 7 is a schematic diagram of a topology of a fifth filtering branch of the filter provided in the present application;

fig. 8 is a schematic diagram of a topology of a sixth filtering branch of the filter provided in the present application;

FIGS. 9 and 10 are schematic diagrams of simulation results of the filter provided in the present application;

fig. 11 is a schematic diagram of an embodiment of a communication device of the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Please refer to fig. 1, which is a schematic structural diagram of a filter 10 according to a first embodiment of the present application.

As shown in fig. 1, the filter 10 of the present embodiment includes: the housing 210 has a first direction D1 and a second direction D2 perpendicular to the first direction D1. The first filtering branch 110 is arranged on the shell 210 and consists of nine filtering cavities which are sequentially coupled, and the nine filtering cavities further form four first cross-coupling zeros; the second filtering branch 130 is composed of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three second cross-coupling zeros; the third filtering branch 140 is composed of eight filtering cavities coupled in sequence, and the eight filtering cavities further form three third cross-coupling zeros; the first filtering branch 110, the second filtering branch 130 and the third filtering branch 140 are sequentially arranged along the first direction D1.

Preferably, the first filtering branch 110 of this embodiment is a transmitting filtering branch, the second filtering branch 130 of this embodiment is a receiving filtering branch, and the third filtering branch 140 of this embodiment is a receiving filtering branch.

By arranging the first filtering branch 110, the second filtering branch 130 and the third filtering branch 140 in sequence along the first direction D1, the layout can be facilitated and the size of the filter can be reduced.

The coupling zero point is also called a transmission zero point, so that zero point suppression can be realized, and the debugging of indexes is facilitated. The transmission zero is the transmission function of the filter is equal to zero, namely, the electromagnetic energy cannot pass through the network on the frequency point corresponding to the transmission zero, so that the full isolation effect is achieved, the suppression effect on signals outside the passband is achieved, and the high isolation among the multiple passbands can be better achieved.

Specifically, as shown in fig. 1, the nine filter cavities of the first filter branch 110 are specifically the first filter cavity a1 through the ninth filter cavity a9 of the first filter branch 110, and the nine first emission filter cavities are divided into three columns arranged along the second direction D2; the first filtering cavity a1 of the first filtering branch 110, the second filtering cavity a2 of the first filtering branch 110, the sixth filtering cavity a6 of the first filtering branch 110 and the seventh filtering cavity a7 of the first filtering branch 110 are in a row and are sequentially arranged along a first direction D1; the third filter cavity A3 of the first filter branch circuit 110, the fifth filter cavity a5 of the first filter branch circuit 110 and the eighth filter cavity A8 of the first filter branch circuit 110 are in a row and are sequentially arranged along a first direction D1; the fourth filter cavity a4 of the first filter branch 110 and the ninth filter cavity a9 of the first filter branch 110 are aligned in a row and arranged along the first direction D1; the fifth filtering cavity a5 of the first filtering branch 110 is respectively adjacent to the second filtering cavity a2 of the first filtering branch 110, the third filtering cavity A3 of the first filtering branch 110, the fourth filtering cavity a4 of the first filtering branch 110, the sixth filtering cavity a6 of the first filtering branch 110, the eighth filtering cavity A8 of the first filtering branch 110, and the ninth filtering cavity a9 of the first filtering branch 110.

Preferably, in this embodiment, the sizes of the first filter cavity a1 of the first filter branch 110 to the ninth filter cavity a9 of the first filter branch 110 may be the same, so as to facilitate layout and debugging, and improve the uniformity of the combiner 10.

In addition, in some other embodiments, the adjacent arrangement may also be equidistantly spaced to facilitate layout and debugging, thereby improving the uniformity of the filter 10.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a topology of the first filtering branch 110 of the filter 10 according to the present application.

As shown in fig. 2, the first filter cavity a1 of the first filter branch 110 and the third filter cavity A3 of the first filter branch 110, the fifth filter cavity a5 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110 are inductively cross-coupled, the third filter cavity A3 of the first filter branch 110 and the fifth filter cavity a5 of the first filter branch 110, and the sixth filter cavity a6 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110 are capacitively cross-coupled, respectively, to form four cross-coupling zeros.

Specifically, a window may be disposed between the first filter cavity a1 of the first filter branch 110 and the third filter cavity A3 of the first filter branch 110, and a metal coupling rib is disposed on the window, so that an inductive cross-coupling is implemented between the first filter cavity a1 of the first filter branch 110 and the third filter cavity A3 of the first filter branch 110, and an inductive cross-coupling zero is formed, which is equivalent to the inductor L1 shown in fig. 2. A window may be disposed between the fifth filter cavity a5 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110, and a metal coupling rib is disposed on the window, so that an inductive cross-coupling zero is formed between the fifth filter cavity a5 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110, which is equivalent to the inductance L2 shown in fig. 2.

The inductive cross coupling is realized through the metal coupling ribs, the metal coupling ribs are small in change of external temperature, and the filter 10 is prevented from generating temperature drift.

A capacitive coupling zero is formed between the third filter cavity A3 of the first filter branch 110 and the fifth filter cavity a5 of the first filter branch 110, which is equivalent to the capacitor C1 shown in fig. 2, and a capacitive cross-coupling zero is formed between the sixth filter cavity a6 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110, which is equivalent to the capacitor C2 shown in fig. 2.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. Namely, a flying bar is arranged between the third filtering cavity A3 of the first filtering branch 110 and the fifth filtering cavity a5 of the first filtering branch 110; that is, a flying bar is disposed between the sixth filtering cavity a6 of the first filtering branch 110 and the eighth filtering cavity A8 of the first filtering branch 110. Therefore, the positional relationship between the third filter cavity A3 of the first filter branch 110 in the receiving filter branch 110 and the fifth filter cavity a5 of the first filter branch 110, the six first transmitting filter cavities a6 and the eighth filter cavity A8 of the first filter branch 110 are combined; in this application, the distance between the third filtering cavity A3 of the first filtering branch 110 and the fifth filtering cavity a5, the six first emitting filtering cavities a6 of the first filtering branch 110 and the eighth filtering cavity A8 of the first filtering branch 110 is equal, so that the flying rod element with the same specification can be adopted to achieve the effect of realizing two capacitive coupling zeros. Specifically, the combiner 10 further includes a first port (not shown) coupled to the first filter cavity a1 of the first filter branch 110 and a second port (not shown) coupled to the ninth filter cavity a9 of the first filter branch 110, wherein the first port and the second port may be taps of the filter 10.

The resonant frequencies of the first filter cavity a1 of the first filter branch 110 to the ninth filter cavity a9 of the first filter branch 110 are in the following ranges in sequence:

2006Mhz-2008Mhz、2018Mhz-2020Mhz、2005Mhz-2007Mhz、1998Mhz-2000Mhz、2006Mhz-2008Mhz、2006Mhz-2008Mhz、2007Mhz-2009Mhz、2006Mhz-2008Mhz、2006Mhz-2008Mhz。

a coupling bandwidth between the first port and the first filter cavity a1 of the first filter branch 110, a coupling bandwidth between the first filter cavity a1 of the first filter branch 110 and the second filter cavity a2 of the first filter branch 110, a coupling bandwidth between the second filter cavity a2 of the first filter branch 110 and the third filter cavity A3 of the first filter branch 110, a coupling bandwidth between the third filter cavity A3 of the first filter branch 110 and the fourth filter cavity A4 of the first filter branch 110, a coupling bandwidth between the third filter cavity A3 of the first filter branch 110 and the fifth filter cavity A5 of the first filter branch 110, a coupling bandwidth between the fourth filter cavity A4 of the first filter branch 110 and the sixth filter cavity a 362 of the first filter branch 110, a coupling bandwidth between the fifth filter cavity a1 of the first filter branch 110 and the sixth filter cavity a 6853 of the first filter branch 110, A8 and the first filter cavity a 68542 of the first filter branch 110, The coupling bandwidth between the sixth filter cavity a6 of the first filter branch 110 and the seventh filter cavity a7 of the first filter branch 110, the coupling bandwidth between the sixth filter cavity a6 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110, the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 110 and the eighth filter cavity A8 of the first filter branch 110, the coupling bandwidth between the eighth filter cavity A8 of the first filter branch 110 and the ninth filter cavity a9 of the first filter branch 110, and the coupling bandwidth between the ninth filter cavity a9 and the second port of the first filter branch 110 are respectively in the following ranges:

24Mhz-31Mhz、12Mhz-18Mhz、14Mhz-20Mhz、6Mhz-11Mhz、11Mhz-16Mhz、-9Mhz--10Mhz、10Mhz-15Mhz、11Mhz-17Mhz、-4Mhz-0Mhz、13Mhz-19Mhz、-1Mhz-3Mhz、13Mhz-19Mhz、20Mhz-26Mhz、24Mhz-31Mhz。

therefore, the bandwidth of the first filtering branch circuit 110 can be within 1994-2201 MHz, and the design requirement is met.

Specifically, as shown in fig. 1, the eight filter cavities of the second filter branch 130 are specifically the first filter cavity C1 of the first filter branch 110 to the eighth filter cavity C8 of the first filter branch 110, and the eight filter cavities of the third filter branch 140 are specifically the first filter cavity D1 of the second filter branch 130 to the eighth filter cavity D8 of the second filter branch 130. The first filter cavity C1 of the second filter branch 130 to the fifth filter cavity C5 of the second filter branch 130, the eight second receiving filter cavities are divided into four columns arranged along the second direction D2; the second filtering cavity D2 of the third filtering branch 140, the second filtering cavity C2 of the second filtering branch 130 and the first filtering cavity C1 of the second filtering branch 130 are in a row and are sequentially arranged along a first direction D1, and the second filtering cavity D2 of the third filtering branch 140 and the second filtering cavity C2 of the second filtering branch 130 are arranged at intervals; the first filter cavity D1 of the third filter branch 140, the third filter cavity D3 of the third filter branch 140, the third filter cavity C3 of the second filter branch 130 and the fourth filter cavity C4 of the second filter branch 130 are in a row and are sequentially arranged along the first direction D1, and the third filter cavity D3 of the third filter branch 140 and the third filter cavity C3 of the second filter branch 130 are arranged at intervals; the fourth filtering cavity D4 of the third filtering branch 140, the seventh filtering cavity D7 of the third filtering branch 140 and the fifth filtering cavity C5 of the second filtering branch 130 are in a row and are sequentially arranged along the first direction D1, and the seventh filtering cavity D7 of the third filtering branch 140 and the fifth filtering cavity C5 of the second filtering branch 130 are arranged at intervals; the fifth filter cavity D5 of the third filter branch 140, the sixth filter cavity D6 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140 are in a row and are sequentially arranged along the first direction D1; the sixth filter cavity C6 of the second filter branch 130 is far away from the third filter cavity C3 of the second filter branch 130 along the second direction D2 relative to the fifth filter cavity C5 of the second filter branch 130, so that an included angle between a connecting line of a center of the sixth filter cavity C6 of the second filter branch 130 and a center of the fifth filter cavity C5 of the second filter branch 130, and a connecting line of a center of the third filter cavity C3 of the second filter branch 130 and a center of the fifth filter cavity C5 of the second filter branch 130 is an acute angle; the sixth filtering cavity C6 of the second filtering branch 130 and the eighth filtering cavity C8 of the second filtering branch 130 are in a row and are sequentially arranged along the first direction D1; the seventh filtering cavity C7 of the second filtering branch 130 is respectively adjacent to the fourth filtering cavity C4 of the second filtering branch 130, the sixth filtering cavity C6 of the second filtering branch 130 and the eighth filtering cavity C8 of the second filtering branch 130; the third filtering cavity C3 of the second filtering branch 130 is respectively adjacent to the first filtering cavity C1 of the second filtering branch 130, the second filtering cavity C2 of the second filtering branch 130, the fourth filtering cavity C4 of the second filtering branch 130 and the fifth filtering cavity C5 of the second filtering branch 130; the first filter cavity D1 of the third filter branch 140 is respectively adjacent to the second filter cavity D2 of the third filter branch 140, the third filter cavity D3 of the third filter branch 140 and the fourth filter cavity D4 of the third filter branch 140, and the sixth filter cavity D6 of the third filter branch 140 is respectively adjacent to the fourth filter cavity D4 of the third filter branch 140, the fifth filter cavity D5 of the third filter branch 140, the seventh filter cavity D7 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140.

Preferably, in this embodiment, the eight filter cavities of the second filter branch 130 and the eight filter cavities of the third filter branch 140 may have the same size and are smaller than the nine filter cavities of the first filter branch 110, so as to facilitate layout and debugging and improve the uniformity of the combiner 10.

Referring to fig. 3 and fig. 4, fig. 3 is a schematic diagram of a topology structure of a second filtering branch 130 of the filter provided by the present application, and fig. 4 is a schematic diagram of a topology structure of a third filtering branch 140 of the filter provided by the present application.

As shown in fig. 3, the first filter cavity C1 of the second filter branch 130 and the third filter cavity C3 of the second filter branch 130, and the third filter cavity C3 of the second filter branch 130 and the fifth filter cavity C5 of the second filter branch 130 are inductively cross-coupled, and the sixth filter cavity C6 of the second filter branch 130 and the eighth filter cavity C8 of the second filter branch 130 are capacitively cross-coupled to form three first receiving coupling zeros; as shown in fig. 4, the first filter cavity D1 of the third filter branch 140 and the third filter cavity D3 of the third filter branch 140, and the fourth filter cavity D4 of the third filter branch 140 and the sixth filter cavity D6 of the third filter branch 140 are inductively cross-coupled, and the sixth filter cavity D6 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140 are capacitively cross-coupled, so as to form three cross-coupling zeros.

Specifically, windows may be disposed between the first filter cavity C1 of the second filter branch 130 and the third filter cavity C3 of the second filter branch 130, between the third filter cavity C3 of the second filter branch 130 and the fifth filter cavity C5 of the second filter branch 130, and metal coupling ribs are disposed on the windows, so that an inductive cross coupling is implemented between the first filter cavity C1 of the second filter branch 130 and the third filter cavity C3 of the second filter branch 130, and between the third filter cavity C3 of the second filter branch 130 and the fifth filter cavity C5 of the second filter branch 130, so as to form an inductive cross coupling, which is equivalent to zero point inductors L1 and L2 shown in fig. 3, respectively. Windows may be disposed between the first filter cavity D1 of the third filter branch 140 and the third filter cavity D3 of the third filter branch 140, between the fourth filter cavity D4 of the third filter branch 140 and the sixth filter cavity D6 of the third filter branch 140, and metal coupling ribs are disposed on the windows, so that inductive cross coupling is achieved between the first filter cavity D1 of the third filter branch 140 and the third filter cavity D3 of the third filter branch 140, and between the fourth filter cavity D4 of the third filter branch 140 and the sixth filter cavity D6 of the third filter branch 140, an inductive cross coupling zero is formed, which is equivalent to the inductors L1 and L2 shown in fig. 4, respectively.

A capacitive coupling zero point, which is equivalent to the capacitor C1 shown in fig. 3, is formed between the sixth filter cavity C6 of the second filter branch 130 and the eighth filter cavity C8 of the second filter branch 130; a capacitive cross-coupling zero, equivalent to the capacitor C1 shown in fig. 4, is formed between the sixth filter cavity D6 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. Namely, a flying bar is arranged between the sixth filtering cavity C6 of the second filtering branch 130 and the eighth filtering cavity C8 of the second filtering branch 130; that is, a flying bar is disposed between the sixth filtering cavity D6 of the third filtering branch 140 and the eighth filtering cavity D8 of the third filtering branch 140. In addition, the position relationship between the sixth filter cavity C6 of the second filter branch 130 and the eighth filter cavity C8 of the second filter branch 130, and the position relationship between the sixth filter cavity D6 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140 in the first and second receiving

filter branches

130 and 140 are combined; in this application, the distance between the sixth filtering cavity C6 of the second filtering branch 130 and the eighth filtering cavity C8 of the second filtering branch 130, the distance between the sixth filtering cavity D6 of the third filtering branch 140 and the eighth filtering cavity D8 of the third filtering branch 140 in the first and second receiving filtering

branches

130 and 140 are equal, so that the flying rod element with the same specification can be adopted, and the effect of realizing two capacitive coupling zeros can be achieved.

Specifically, the filter 10 further includes a first port (not shown) coupled to the first filter cavity C1 of the second filter branch 130 and a second port (not shown) coupled to the eighth filter cavity C8 of the second filter branch 130, wherein both the first port and the second port may be taps of the filter 10.

The resonant frequencies of the first filter cavity C1 of the second filter branch 130 to the eighth filter cavity C8 of the second filter branch 130 are sequentially in the following ranges:

1916Mhz-1918Mhz、1918Mhz-2000Mhz、1917Mhz-1919Mhz、1918Mhz-1920Mhz、1916Mhz-1918Mhz、1917Mhz-1919Mhz、1912Mhz-1914Mhz、1916Mhz-1918Mhz。

a coupling bandwidth between the first port and the first filter cavity C1 of the second filter branch 130, a coupling bandwidth between the first filter cavity C1 of the second filter branch 130 and the second filter cavity C2 of the second filter branch 130, a coupling bandwidth between the first filter cavity C1 of the second filter branch 130 and the third filter cavity C3 of the second filter branch 130, a coupling bandwidth between the second filter cavity C2 of the second filter branch 130 and the third filter cavity C3 of the second filter branch 130, a coupling bandwidth between the third filter cavity C3 of the second filter branch 130 and the fourth filter cavity C4 of the second filter branch 130, a coupling bandwidth between the third filter cavity C3 of the second filter branch 130 and the fifth filter cavity C362 of the second filter branch 130, a coupling bandwidth between the fourth filter cavity C4 of the second filter branch 130 and the fifth filter cavity C5 of the second filter branch 130, a coupling bandwidth between the fifth filter cavity C7384 of the second filter branch 130 and the sixth filter cavity C68542 of the second filter branch 130, The coupling bandwidth between the sixth filter cavity C6 of the second filter branch 130 and the seventh filter cavity C1 of the second filter branch 130, the coupling bandwidth between the sixth filter cavity C6 of the second filter branch 130 and the eighth filter cavity C8 of the second filter branch 130, the coupling bandwidth between the seventh filter cavity C7 of the second filter branch 130 and the eighth filter cavity C8 of the second filter branch 130, and the coupling bandwidth between the eighth filter cavity C8 and the second port of the second filter branch 130 are respectively in the following ranges:

8Mhz-13Mhz、6Mhz-11Mhz、0Mhz-4Mhz、3Mhz-8Mhz、3Mhz-8Mhz、0Mhz-4Mhz、3Mhz-8Mhz、3Mhz-8Mhz、2Mhz-6Mhz、-7Mhz--4Mhz、4Mhz-9Mhz、8Mhz-13Mhz。

specifically, the combiner 10 further includes a first port (not shown) coupled to the first filter cavity D1 of the third filter branch 140 and a second port (not shown) coupled to the eighth filter cavity D8 of the second filter branch 130, wherein the first port and the second port may be taps of the filter 10.

The resonant frequencies of the first filter cavity D1 of the third filter branch 140 to the eighth filter cavity D8 of the third filter branch 140 are sequentially in the following ranges:

1916Mhz-1918Mhz、1918Mhz-2000Mhz、1917Mhz-1919Mhz、1916Mhz-1918Mhz、1918Mhz-1920Mhz、1917Mhz-1919Mhz、1912Mhz-1914Mhz、1916Mhz-1918Mhz。

a coupling bandwidth between the first port and the first filter cavity D1 of the third filter branch 140, a coupling bandwidth between the first filter cavity D1 of the second filter branch 130 and the second filter cavity D2 of the second filter branch 130, a coupling bandwidth between the first filter cavity D1 of the third filter branch 140 and the third filter cavity D3 of the third filter branch 140, a coupling bandwidth between the second filter cavity D2 of the third filter branch 140 and the third filter cavity D3 of the third filter branch 140, a coupling bandwidth between the third filter cavity D3 of the third filter branch 140 and the fourth filter cavity D4 of the third filter branch 140, a coupling bandwidth between the fourth filter cavity D4 of the third filter branch 140 and the fifth filter cavity D2 of the third filter branch 140, a coupling bandwidth between the fourth filter cavity D4 of the third filter branch 140 and the sixth filter cavity D73725 of the third filter branch 140, a coupling bandwidth between the fourth filter cavity D4 of the third filter branch 140 and the fifth filter cavity D5 of the third filter branch 140, a coupling bandwidth between the fourth filter cavity D4 of the third filter branch 140 and the sixth filter cavity D68542 of the third filter branch 140, and the sixth filter cavity D6853 of the third filter branch 140, The coupling bandwidth between the sixth filter cavity D6 of the third filter branch 140 and the seventh filter cavity D7 of the third filter branch 140, the coupling bandwidth between the sixth filter cavity D6 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140, the coupling bandwidth between the seventh filter cavity D7 of the third filter branch 140 and the eighth filter cavity D8 of the third filter branch 140, and the coupling bandwidth between the eighth filter cavity D8 of the third filter branch 140 and the second port are respectively in the following ranges:

8Mhz-13Mhz、6Mhz-11Mhz、0Mhz-4Mhz、3Mhz-8Mhz、3Mhz-8Mhz、3Mhz-8Mhz、0Mhz-4Mhz、3Mhz-8Mhz、2Mhz-6Mhz、-7Mhz--4Mhz、4Mhz-9Mhz、8Mhz-13Mhz。

therefore, the bandwidth of the receiving filtering branch circuit can be within 1919-2201 MHz, and the design requirement is met.

The beneficial effect of this embodiment is: by arranging the first filtering branch 110110, the second filtering branch 130130 and the third filtering branch 140140 in sequence along the first direction D1, the layout can be facilitated and the size of the filter can be reduced.

The first filtering branch circuit 110 further forms four cross-coupling zero points, so that the bandwidth range of the first filtering branch circuit 110 is 1994-2201 MHz; the second filtering branch 130 further forms three cross-coupling zero points, and the third filtering branch 140 further forms three cross-coupling zero points, so that the bandwidth range of the second filtering branch 130 is 1919-2201 MHz; therefore, the performance of out-of-band rejection and the like of the combiner can be improved, and high isolation among different channels is met.

Please refer to fig. 5, which is a schematic structural diagram of the filter 10 provided in the present application.

As shown in fig. 5, the filter 10 provided in the second embodiment of the present application further includes a fourth filtering branch 120, a fifth filtering branch 150, and a sixth filtering branch 160 on the basis of the first embodiment.

Preferably, in this embodiment, the fourth filtering branch 120 is a transmitting filtering branch, and the fifth and sixth filtering branches are receiving filtering branches.

The fourth filtering branch 120 is disposed adjacent to the first filtering branch 110, and is composed of nine filtering cavities sequentially coupled along the second main transmitting coupling path, and the nine filtering cavities further form four cross-coupling zeros; the fifth filtering branch 150 and the second filtering branch 130 are arranged at intervals and are composed of eight filtering cavities sequentially coupled along a third main receiving coupling path, and the eight filtering cavities further form three cross-coupling zeros; and a sixth filtering branch 160, which is disposed adjacent to the third filtering branch 140 and is composed of eight filtering cavities sequentially coupled along the fourth main receiving coupling path, wherein the eight filtering cavities further form three cross-coupling zeros.

Specifically, as shown in fig. 5, the nine filter cavities of the fourth filter branch 120 are the first filter cavity B1 of the fourth filter branch 120 to the eighth filter cavity B9 of the fourth filter branch 120.

The fourth filtering branch 120 is symmetrically disposed with respect to the first filtering branch 110, and a ninth filtering cavity of the fourth filtering branch 120 and the ninth filtering cavity of the first filtering branch 110 are adjacently disposed along the second direction.

The structure of the fourth filtering branch 120120 can be referred to the first filtering branch 110, and will not be described herein. ,

referring to fig. 6, fig. 6 is a schematic diagram illustrating a topology of the fourth filtering branch 120150 of the filter 10 according to the present application;

as shown in fig. 6, the first filter cavity B1 of the fourth filter branch 120 and the third filter cavity B3 of the fourth filter branch 120, the fifth filter cavity B5 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120 are inductively cross-coupled, the third filter cavity B3 of the fourth filter branch 120 and the fifth filter cavity B5 of the fourth filter branch 120, and the sixth filter cavity B6 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120 are capacitively cross-coupled, respectively, to form four coupling zeros.

Specifically, windows may be disposed between the first filter cavity B1 of the fourth filter branch 120 and the third filter cavity B3 of the fourth filter branch 120, between the fifth filter cavity B5 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120, and metal coupling ribs are disposed on the windows, so that an inductive cross coupling is implemented between the first filter cavity B1 of the fourth filter branch 120 and the third filter cavity B3 of the fourth filter branch 120, and between the fifth filter cavity B5 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120, so as to form an inductive cross coupling, which is equivalent to the inductive zeros L1 and L2 shown in fig. 6. The inductive cross coupling is realized through the metal coupling ribs, the metal coupling ribs are small in change of external temperature, and the filter 10 is prevented from generating temperature drift.

Capacitive cross-coupling zeros are formed between the third filter cavity B3 of the fourth filter branch 120 and the fifth filter cavity B5 of the fourth filter branch 120, and between the sixth filter cavity B6 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120, which are equivalent to the capacitors C1 and C2 shown in fig. 6, respectively.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. That is, a flying bar is disposed between the third filter cavity B3 of the fourth filter branch 120 and the fifth filter cavity B5 of the fourth filter branch 120, and between the sixth filter cavity B6 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120. In addition, the position relationship between the third filter cavity B3 of the fourth filter branch 120 and the fifth filter cavity B5 of the fourth filter branch 120, and the position relationship between the sixth filter cavity B6 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120 in the fourth filter branch 120120 are combined; it can be known that, in the present application, the distances between the third filter cavity B3 of the fourth filter branch 120 and the fifth filter cavity B5 of the fourth filter branch 120, and between the sixth filter cavity B6 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120 are equal, so that the flying bar elements with the same specification can be adopted to achieve the effect of implementing two capacitive cross-coupling zeros.

Specifically, the filter 10 further includes a first port (not shown) coupled to the first filter cavity B1 of the fourth filter branch 120 and a second port (not shown) coupled to the ninth filter cavity B9 of the fourth filter branch 120, wherein both the first port and the second port may be taps of the filter 10.

The resonant frequencies of the first filter cavity B1 of the fourth filter branch 120 to the ninth filter cavity B9 of the first filter branch 110 are sequentially in the following ranges:

a coupling bandwidth between the first port Bs and the first filter cavity B1 of the fourth filter branch 120, a coupling bandwidth between the first filter cavity B1 of the fourth filter branch 120 and the second filter cavity B2 of the fourth filter branch 120, a coupling bandwidth between the second filter cavity B2 of the fourth filter branch 120 and the third filter cavity B3 of the fourth filter branch 120, a coupling bandwidth between the third filter cavity B3 of the fourth filter branch 120 and the fourth filter cavity B4 of the fourth filter branch 120, a coupling bandwidth between the third filter cavity B3 of the fourth filter branch 120 and the fifth filter cavity B5 of the fourth filter branch 120, a coupling bandwidth between the fourth filter cavity B4 of the fourth filter branch 120 and the sixth filter cavity B6 of the fourth filter branch 120, a coupling bandwidth between the fifth filter cavity B5 of the fourth filter branch 120 and the sixth filter cavity B733 of the fourth filter branch 120, a coupling bandwidth between the fourth filter cavity B8 of the fourth filter branch 120 and the eighth filter cavity B6 of the fourth filter branch 120, a coupling bandwidth between the fourth filter cavity B4642 and the eighth filter cavity B6 of the fourth filter branch 120, The coupling bandwidth between the sixth filter cavity B6 of the fourth filter branch 120 and the seventh filter cavity B7 of the fourth filter branch 120, the coupling bandwidth between the sixth filter cavity B6 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120, the coupling bandwidth between the seventh filter cavity B7 of the fourth filter branch 120 and the eighth filter cavity B8 of the fourth filter branch 120, the coupling bandwidth between the eighth filter cavity B8 of the fourth filter branch 120 and the ninth filter cavity B9 of the fourth filter branch 120, and the coupling bandwidth between the ninth filter cavity B9 of the fourth filter branch 120 and the second port Ae are respectively in the following ranges:

therefore, the bandwidth of the fourth filtering branch 120 can be within 1994-2201 MHz, and the design requirement is met.

Specifically, as shown in fig. 5, eight filter cavities of the fifth filter branch 150 are the first filter cavity E1 of the fifth filter branch 150 to the eighth filter cavity C8 of the fifth filter branch 150, and eight filter cavities of the sixth filter branch 160 are the first filter cavity F1 of the sixth filter branch 160 to the eighth filter cavity F8 of the fourth filter branch 120.

The eight filter cavities of the fifth filter branch 150 and the eight filter cavities of the sixth filter branch 160 are divided into four rows arranged along the second direction D2; the fifth filter cavity F5 of the sixth filter branch 160, the sixth filter cavity F6 of the sixth filter branch 160, and the eighth filter cavity F8 of the sixth filter branch 160 are in a row and are sequentially arranged along the first direction D1; the fourth filter cavity F4 of the sixth filter branch 160, the seventh filter cavity F7 of the sixth filter branch 160, the fourth filter cavity E4 of the fifth filter branch 150, the seventh filter cavity E7 of the fifth filter branch 150, and the eighth filter cavity E8 of the fifth filter branch 150 are in a row and are sequentially arranged along the first direction D1, and the seventh filter cavity F7 of the sixth filter branch 160 and the fourth filter cavity E4 of the fifth filter branch 150 are arranged at an interval; the first filter cavity F1 of the sixth filter branch 160, the third filter cavity F3 of the sixth filter branch 160, the third filter cavity E3 of the fifth filter branch 150, the fifth filter cavity E5 of the fifth filter branch 150, and the sixth filter cavity E6 of the fifth filter branch 150 are in a row and are sequentially arranged along the first direction D1, the third filter cavity F3 of the sixth filter branch 160 and the third filter cavity E3 of the fifth filter branch 150 are arranged at an interval, and the sixth filter cavity E6 of the fifth filter branch 150 and the third filter cavity B3 of the fourth filter branch 120 are arranged in an intersecting manner; the second filter cavity F2 of the sixth filter branch 160, the second filter cavity E2 of the fifth filter branch 150, and the first filter cavity E1 of the fifth filter branch 150 are in a row and are sequentially arranged along a first direction D1, and the second filter cavity F2 of the sixth filter branch 160 and the second filter cavity E2 of the fifth filter branch 150 are arranged at intervals; the fifth filter cavity F5 of the sixth filter branch 160, the eighth filter cavity F8 of the sixth filter branch 160, the fourth filter cavity F4 of the sixth filter branch 160, and the seventh filter cavity F7 of the sixth filter branch 160 are adjacently disposed, and the sixth filter cavity D6 of the third filter branch and the sixth filter cavity F6 of the sixth filter branch 160 are adjacently disposed along the second direction D2; the third filtering cavity F3 of the sixth filtering branch 160 is adjacent to the fourth filtering cavity F4 of the sixth filtering branch 160, the seventh filtering cavity F7 of the sixth filtering branch 160, the first filtering cavity F1 of the sixth filtering branch 160, and the second filtering cavity F2 of the sixth filtering branch 160; the second filter cavity F2 of the sixth filter branch 160 is disposed adjacent to the first filter cavity F1 of the sixth filter branch 160 and the third filter cavity F3 of the sixth filter branch 160; the fifth filter cavity E5 of the fifth filter branch 150 is disposed adjacent to the fourth filter cavity E4 of the fifth filter branch 150, the seventh filter cavity E7 of the fifth filter branch 150, the third filter cavity E3 of the fifth filter branch 150, the sixth filter cavity E6 of the fifth filter branch 150, and the first filter cavity E1 of the fifth filter branch 150; the second filter cavity E2 of the fifth filter branch 150 is disposed adjacent to the first filter cavity E1 of the fifth filter branch 150 and the third filter cavity E3 of the fifth filter branch 150.

Preferably, in this embodiment, the eight filter cavities of the fifth filter branch 150 and the eight filter cavities of the sixth filter branch 160 may have the same size, and are equal to the size of the eight filter cavities of the second filter branch and the size of the eight filter cavities of the third filter branch, and smaller than the nine filter cavities of the fourth filter branch 120, so as to facilitate layout and debugging, and improve the consistency of the combiner 10.

In addition, in other embodiments, the adjacent arrangement may also be equidistantly spaced.

Referring to fig. 7 and 8, fig. 7 is a schematic diagram illustrating a topology of a fifth filtering branch 150 of the filter provided by the present application; fig. 8 is a schematic diagram of a topology of a sixth filtering branch 160 of the filter provided in the present application.

As shown in fig. 7, the first filter cavity E1 of the fifth filter branch 150 and the third filter cavity E3 of the fifth filter branch 150, and the third filter cavity E3 of the fifth filter branch 150 and the fifth filter cavity E5 of the fifth filter branch 150 are inductively cross-coupled, respectively, and the sixth filter cavity E6 of the fifth filter branch 150 and the eighth filter cavity E8 of the fifth filter branch 150 are capacitively cross-coupled to form three cross-coupling zeros; inductive cross coupling is respectively performed between the first filter cavity F1 of the sixth filter branch 160 and the third filter cavity F3 of the sixth filter branch 160, and between the fourth filter cavity F4 of the sixth filter branch 160 and the sixth filter cavity F6 of the sixth filter branch 160, and capacitive cross coupling is performed between the sixth filter cavity F6 of the sixth filter branch 160 and the eighth filter cavity F8 of the sixth filter branch 160, so as to form three cross-coupling zeros.

Specifically, windows may be disposed between the first filter cavity E1 of the fifth filter branch 150 and the third filter cavity E3 of the fifth filter branch 150, between the third filter cavity E3 of the fifth filter branch 150 and the fifth filter cavity E5 of the fifth filter branch 150, and metal coupling ribs are disposed on the windows, so that an inductive cross coupling is implemented between the first filter cavity E1 of the fifth filter branch 150 and the third filter cavity E3 of the fifth filter branch 150, and between the third filter cavity E3 of the fifth filter branch 150 and the fifth filter cavity E5 of the fifth filter branch 150, so as to form an inductive cross coupling, which is equivalent to zero point inductors L1 and L2 shown in fig. 7, respectively.

As shown in fig. 8, windows may be disposed between the first filter cavity F1 of the sixth filter branch 160 and the third filter cavity F3 of the sixth filter branch 160, between the fourth filter cavity F4 of the sixth filter branch 160 and the sixth filter cavity F6 of the sixth filter branch 160, and metal coupling ribs are disposed on the windows, so that an inductive cross coupling is implemented between the first filter cavity F1 of the sixth filter branch 160 and the third filter cavity F3 of the sixth filter branch 160, and between the fourth filter cavity F4 of the sixth filter branch 160 and the sixth filter cavity F6 of the sixth filter branch 160, so as to form an inductive cross coupling, which is equivalent to the zero point inductors L1 and L2 shown in fig. 8.

A capacitive coupling zero is formed between the sixth filter cavity E6 of the fifth filter branch 150 and the eighth filter cavity E8 of the fifth filter branch 150, which is equivalent to the capacitor C1 shown in fig. 7; a capacitive cross-coupling zero, equivalent to the capacitor C1 shown in fig. 8, is formed between the sixth filter cavity F6 of the sixth filter branch 160 and the eighth filter cavity F8 of the sixth filter branch 160.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. Namely, a flying bar is arranged between the sixth filter cavity E6 of the fifth filter branch 150 and the eighth filter cavity E8 of the fifth filter branch 150; that is, a flying bar is disposed between the sixth filter cavity F6 of the sixth filter branch 160 and the eighth filter cavity F8 of the sixth filter branch 160. In addition, the position relationship between the six third receiving filter cavities E6 of the third and fourth receiving

filter branches

150 and 160 and the eighth filter cavity E8 of the fifth filter branch 150, and the position relationship between the sixth filter cavity F6 of the sixth filter branch 160 and the eighth filter cavity F8 of the sixth filter branch 160 are combined; in this application, the distances between the sixth third receiving filter cavity E6 of the third and fourth receiving

filter branches

150 and 160 and the eighth filter cavity E8 of the fifth filter branch 150 and between the sixth filter cavity F6 of the sixth filter branch 160 and the eighth filter cavity F8 of the sixth filter branch 160 are equal, so that the flying rod elements with the same specification can be adopted to achieve the effect of realizing two capacitive cross-coupling zeros.

Specifically, the combiner 10 further includes a first port Es (not shown) coupled to the first filter cavity E1 of the fifth filter branch 150 and a second port Ee (not shown) coupled to the eighth filter cavity E8 of the fifth filter branch 150, where both the first port Es and the second port Ee may be taps of the filter 10.

The resonant frequencies of the first filter cavity E1 of the fifth filter branch 150 to the eighth filter cavity E8 of the second filter branch are sequentially in the following ranges:

a coupling bandwidth between the first port Es and the first filter cavity E1 of the fifth filter branch 150, a coupling bandwidth between the first filter cavity E1 of the fifth filter branch 150 and the second filter cavity E2 of the fifth filter branch 150, a coupling bandwidth between the first filter cavity E1 of the fifth filter branch 150 and the third filter cavity E3 of the fifth filter branch 150, a coupling bandwidth between the second filter cavity E2 of the fifth filter branch 150 and the third filter cavity E3 of the fifth filter branch 150, a coupling bandwidth between the third filter cavity E3 of the fifth filter branch 150 and the fourth filter cavity E4 of the fifth filter branch 150, a coupling bandwidth between the third filter cavity E3 of the fifth filter branch 150 and the fifth filter cavity E2 of the fifth filter branch 150, a coupling bandwidth between the fourth filter cavity E4 of the fifth filter branch 150 and the fifth filter cavity E383 of the fifth filter branch 150, a coupling bandwidth between the fifth filter cavity E6 of the fifth filter branch 150 and the fifth filter cavity E68542 of the fifth filter branch 150, The coupling bandwidth between the sixth filter cavity E6 of the fifth filter branch 150 and the seventh filter cavity E7 of the fifth filter branch 150, the coupling bandwidth between the sixth filter cavity E6 of the fifth filter branch 150 and the eighth filter cavity E8 of the fifth filter branch 150, the coupling bandwidth between the seventh filter cavity E7 of the fifth filter branch 150 and the eighth filter cavity E8 of the fifth filter branch 150, and the coupling bandwidth between the eighth filter cavity E8 of the fifth filter branch 150 and the second port Ee are respectively in the following ranges:

specifically, the filter 10 further includes a first port Fs (not shown) coupled to the first filter cavity F1 of the sixth filter branch 160 and a second port Fe (not shown) coupled to the eighth filter cavity F8 of the sixth filter branch 160, wherein both the first port Fs and the second port Fe may be taps of the filter 10.

The resonant frequencies of the first filter cavity F1 of the sixth filter branch 160 to the eighth filter cavity F8 of the sixth filter branch 160 are sequentially in the following ranges:

a coupling bandwidth between the first port Fs and the first filter cavity F1 of the sixth filter branch 160, a coupling bandwidth between the first filter cavity F1 of the sixth filter branch 160 and the second filter cavity F2 of the sixth filter branch 160, a coupling bandwidth between the first filter cavity of the sixth filter branch 160F4 and the third filter cavity F3 of the sixth filter branch 160, a coupling bandwidth between the second filter cavity F2 of the sixth filter branch 160 and the third filter cavity F3 of the sixth filter branch 160, a coupling bandwidth between the third filter cavity F3 of the sixth filter branch 160 and the fourth filter cavity F4 of the sixth filter branch 160, a coupling bandwidth between the fourth filter cavity F4 of the sixth filter branch 160 and the fifth filter cavity F2 of the sixth filter branch 160, a coupling bandwidth between the fourth filter cavity F4 of the sixth filter branch 160 and the sixth filter cavity F6 of the sixth filter branch 160, a coupling bandwidth between the sixth filter cavity F7384 of the sixth filter branch 160 and the sixth filter cavity F68542, The coupling bandwidth between the sixth filter cavity F6 of the sixth filter branch 160 and the seventh filter cavity F8 of the sixth filter branch 160, the coupling bandwidth between the sixth filter cavity F6 of the sixth filter branch 160 and the eighth filter cavity F8 of the sixth filter branch 160, the coupling bandwidth between the seventh filter cavity F7 of the third filter branch and the eighth filter cavity F of the third filter branch, and the coupling bandwidth between the eighth filter cavity F8 of the sixth filter branch 160 and the second port Fe are respectively in the following ranges:

As shown in FIG. 9, the bandwidths (see frequency band 300) of the first and

fourth filtering branches

110 and 120 of this embodiment are 1994-2201 MHz, the rejection of the filter 10 is greater than or equal to 85dB in the bandwidths of 1920 MHz-1960 MHz, greater than or equal to 40dB in the bandwidths of 1960 MHz-1980 MHz, greater than or equal to 40dB in the bandwidths of 1980 MHz-1985 MHz, greater than or equal to 27dB in the bandwidths of 2025 MHz-2030 MHz, and greater than or equal to 37dB in the bandwidths of 2030 MHz-2035 MHz. Three low-side coupling zeros are formed, thereby creating high-side isolation from other channels.

As shown in FIG. 10, the bandwidths (see band 400) of the two, three, five, and six filtering branches of this embodiment are within 1919-2201 MHz, and the rejection of the filter 10 is greater than or equal to 25dB within the bandwidth of 1830 MHz-1865 MHz, greater than or equal to 56dB within the bandwidth of 1930 MHz-1945 MHz, and greater than or equal to 60dB within the bandwidth of 1945 MHz-1995 MHz. Three low-side coupling zeros are formed to create high-side isolation from other channels.

The filter 10 of the embodiment of the present application includes: the filter comprises a first filtering branch circuit 110, a second filtering branch circuit 130, a third filtering branch circuit 140, a fourth filtering branch circuit 120, a fifth filtering branch circuit 150 and a sixth filtering branch circuit 160, wherein the fourth filtering branch circuit 120 is arranged adjacent to the first filtering branch circuit 110, the fifth filtering branch circuit 150 is arranged at an interval with the second filtering branch circuit 130, and the sixth filtering branch circuit 160 is arranged adjacent to the third filtering branch circuit 140 and is sequentially arranged along a first direction, so that the layout is facilitated and the size of the filter is reduced. In addition, the fourth filtering branch 120 further forms four cross-coupling zeros, the fifth filtering branch 150 further forms three cross-coupling zeros, and the sixth filtering branch 160 further forms three cross-coupling zeros, so that the out-of-band rejection performance of the filter can be improved, and the requirement for high isolation between signals of different channels can be met.

The present application further provides a communication device, as shown in fig. 11, fig. 11 is a schematic diagram of an embodiment of the communication device of the present application.

As shown in fig. 11, the communication device 30 of this embodiment includes an antenna 32 and a Radio frequency unit 31, where the antenna 32 is connected to the Radio frequency unit 31, and the Radio frequency unit may be an rru (remote Radio unit). The rf unit 31 includes the filter 10 disclosed in the above embodiments, and is used for filtering the rf signal.

In other embodiments, the rf unit 31 may be integrated with the Antenna 32 to form an active Antenna unit (aau).

Therefore, the bandwidth of the radio frequency signal transmitted by the base station device 30 is within the range of 1425-1882 MHz, and the bandwidth of the received radio frequency signal is within the range of 1919-2201 MHz, so that the design requirements can be met.

It should be noted that, some embodiments of the present application refer to the present invention as a filter, and may also be referred to as a combiner, that is, a dual-band combiner, and may also be referred to as a duplexer in other embodiments.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A filter, characterized in that the filter comprises:

a housing having a first direction and a second direction perpendicular to the first direction;

the first filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled, and the nine filtering cavities further form four first cross-coupling zeros;

the second filtering branch consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three second cross coupling zeros;

the third filtering branch consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities further form three third cross coupling zeros;

the first filtering branch, the second filtering branch and the third filtering branch are sequentially arranged along the first direction.

2. The filter of claim 1,

nine filter cavities of the first filter branch are divided into three rows arranged along the second direction;

the first filter cavity of the first filter branch, the second filter cavity of the first filter branch, the sixth filter cavity of the first filter branch and the seventh filter cavity of the first filter branch are in a row and are sequentially arranged along the first direction;

the third filter cavity of the first filter branch, the fifth filter cavity of the first filter branch and the eighth filter cavity of the first filter branch are in a row and are sequentially arranged along the first direction;

the fourth filter cavity of the first filter branch and the ninth filter cavity of the first filter branch are in a row and are arranged along the first direction;

the fifth filtering cavity of the first filtering branch is respectively adjacent to the second filtering cavity of the first filtering branch, the third filtering cavity of the first filtering branch, the fourth filtering cavity of the first filtering branch, the sixth filtering cavity of the first filtering branch, the eighth filtering cavity of the first filtering branch and the ninth filtering cavity of the first filtering branch.

3. The filter of claim 2,

inductive cross coupling is respectively performed between the first filter cavity of the first filter branch and the third filter cavity of the first filter branch, between the fifth filter cavity of the first filter branch and the eighth filter cavity of the first filter branch, capacitive cross coupling is respectively performed between the third filter cavity of the first filter branch and the fifth filter cavity of the first filter branch, and between the sixth filter cavity of the first filter branch and the eighth filter cavity of the first filter branch, so that four first cross coupling zeros are formed.

4. The filter of claim 2,

eight filter cavities from the first filter cavity of the second filter branch to the fifth filter cavity of the second filter branch and eight filter cavities of the third filter branch are divided into four rows arranged along the second direction;

the second filter cavities of the third filter branch, the second filter cavities of the second filter branch and the first filter cavities of the second filter branch are in a row and are sequentially arranged along the first direction, and the second filter cavities of the third filter branch and the second filter cavities of the second filter branch are arranged at intervals;

the first filter cavity of the third filter branch, the third filter cavity of the second filter branch and the fourth filter cavity of the second filter branch are in a row and are sequentially arranged along the first direction, and the third filter cavity of the third filter branch and the third filter cavity of the second filter branch are arranged at intervals;

the fourth filter cavity of the third filter branch, the seventh filter cavity of the third filter branch and the fifth filter cavity of the second filter branch are in a row and are sequentially arranged along the first direction, and the seventh filter cavity of the third filter branch and the fifth filter cavity of the second filter branch are arranged at intervals;

the fifth filter cavity of the third filter branch, the sixth filter cavity of the third filter branch and the eighth filter cavity of the third filter branch are in a row and are sequentially arranged along the first direction;

the sixth filter cavity of the second filter branch is far away from the third filter cavity of the second filter branch relative to the fifth filter cavity of the second filter branch along the second direction, so that an included angle between a connecting line of the center of the sixth filter cavity of the second filter branch and the center of the fifth filter cavity of the second filter branch, and an included angle between a connecting line of the center of the third filter cavity of the second filter branch and the center of the fifth filter cavity of the second filter branch are acute angles;

the sixth filtering cavities of the second filtering branch and the eighth filtering cavities of the second filtering branch are in a row and are sequentially arranged along the first direction;

the seventh filter cavity of the second filter branch is respectively adjacent to the fourth filter cavity of the second filter branch, the sixth filter cavity of the second filter branch and the eighth filter cavity of the second filter branch;

the third filter cavity of the second filter branch is respectively adjacent to the first filter cavity of the second filter branch, the second filter cavity of the second filter branch, the fourth filter cavity of the second filter branch and the fifth filter cavity of the second filter branch;

the first filter cavity of the third filter branch is respectively adjacent to the second filter cavity of the third filter branch, the third filter cavity of the third filter branch and the fourth filter cavity of the third filter branch, and the sixth filter cavity of the third filter branch is respectively adjacent to the fourth filter cavity of the third filter branch, the fifth filter cavity of the third filter branch, the seventh filter cavity of the third filter branch and the eighth filter cavity of the third filter branch.

5. The filter of claim 4,

inductive cross coupling is respectively performed between a first filtering cavity of the second filtering branch and a third filtering cavity of the second filtering branch and between a third filtering cavity of the second filtering branch and a fifth filtering cavity of the second filtering branch, and capacitive cross coupling is performed between a sixth filtering cavity of the second filtering branch and an eighth filtering cavity of the second filtering branch to form three second cross coupling zeros;

inductive cross coupling is respectively performed between the first filtering cavity of the third filtering branch and the third filtering cavity of the third filtering branch and between the fourth filtering cavity of the third filtering branch and the sixth filtering cavity of the third filtering branch, and capacitive cross coupling is performed between the sixth filtering cavity of the third filtering branch and the eighth filtering cavity of the third filtering branch, so that three third cross coupling zeros are formed.

6. The filter of claim 4, wherein the filter comprises:

the fourth filtering branch is arranged adjacent to the first filtering branch and consists of nine filtering cavities which are sequentially coupled along a second main transmitting coupling path, and the nine filtering cavities further form four fourth cross coupling zero points;

the fifth filtering branch circuit is arranged at an interval with the second filtering branch circuit and consists of eight filtering cavities which are sequentially coupled along a third main receiving coupling path, and the eight filtering cavities further form three fifth cross coupling zero points;

and the sixth filtering branch is arranged adjacent to the third filtering branch and consists of eight filtering cavities which are sequentially coupled along a fourth main receiving coupling path, and the eight filtering cavities further form three sixth cross-coupling zero points.

7. The filter of claim 6,

the fourth filtering branch is symmetrically arranged relative to the first filtering branch, and a ninth filtering cavity of the fourth filtering branch and the ninth filtering cavity of the first filtering branch are adjacently arranged along the second direction.

8. The filter of claim 7,

inductive cross coupling is respectively performed between the first filtering cavity of the fourth filtering branch and the third filtering cavity of the fourth filtering branch, between the fifth filtering cavity of the fourth filtering branch and the eighth filtering cavity of the fourth filtering branch, capacitive cross coupling is respectively performed between the third filtering cavity of the fourth filtering branch and the fifth filtering cavity of the fourth filtering branch, and between the sixth filtering cavity of the fourth filtering branch and the eighth filtering cavity of the fourth filtering branch, so that four fourth cross coupling zeros are formed.

9. The filter of claim 6,

the eight filter cavities of the fifth filter branch circuit and the eight filter cavities of the sixth filter branch circuit are divided into four rows arranged along the second direction;

the fifth filter cavity of the sixth filter branch, the sixth filter cavity of the sixth filter branch and the eighth filter cavity of the sixth filter branch are in a row and are sequentially arranged along the first direction;

the fourth filter cavity of the sixth filter branch, the seventh filter cavity of the sixth filter branch, the fourth filter cavity of the fifth filter branch, the seventh filter cavity of the fifth filter branch and the eighth filter cavity of the fifth filter branch are in a row and are sequentially arranged along the first direction, and the seventh filter cavity of the sixth filter branch and the fourth filter cavity of the fifth filter branch are arranged at intervals;

the first filter cavity of the sixth filter branch, the third filter cavity of the fifth filter branch, the fifth filter cavity of the fifth filter branch and the sixth filter cavity of the fifth filter branch are in a row and are sequentially arranged along the first direction, the third filter cavity of the sixth filter branch and the third filter cavity of the fifth filter branch are arranged at intervals, and the sixth filter cavity of the fifth filter branch and the third filter cavity of the second emission filter branch are arranged in an intersecting manner;

the second filter cavities of the sixth filter branch, the fifth filter cavity of the fifth filter branch and the first filter cavity of the fifth filter branch are in a row and are sequentially arranged along the first direction, and the second filter cavities of the sixth filter branch and the fifth filter cavity of the fifth filter branch are arranged at intervals;

a fifth filter cavity of the sixth filter branch, an eighth filter cavity of the sixth filter branch, a fourth filter cavity of the sixth filter branch, and a seventh filter cavity of the sixth filter branch are adjacently arranged, and a sixth filter cavity of the second receiving filter branch and the sixth filter cavity of the sixth filter branch are adjacently arranged along a second direction; the third filter cavity of the sixth filter branch is adjacent to the fourth filter cavity of the sixth filter branch, the seventh filter cavity of the sixth filter branch, the first filter cavity of the sixth filter branch and the second filter cavity of the sixth filter branch; the second filter cavity of the sixth filter branch is adjacent to the first filter cavity of the sixth filter branch and the third filter cavity of the sixth filter branch;

a fifth filter cavity of the fifth filter branch is adjacent to a fourth filter cavity of the fifth filter branch, a seventh filter cavity of the fifth filter branch, a third filter cavity of the fifth filter branch, a sixth filter cavity of the fifth filter branch and the first filter cavity of the fifth filter branch; the second filter cavity of the fifth filter branch is adjacent to the first filter cavity of the fifth filter branch and the third filter cavity of the fifth filter branch;

inductive cross coupling is respectively performed between a first filtering cavity of the fifth filtering branch and a third filtering cavity of the fifth filtering branch and between a third filtering cavity of the fifth filtering branch and a fifth filtering cavity of the fifth filtering branch, and capacitive cross coupling is performed between a sixth filtering cavity of the fifth filtering branch and an eighth filtering cavity of the fifth filtering branch to form three coupling zeros;

inductive cross coupling is respectively performed between the first filtering cavity of the sixth filtering branch and the third filtering cavity of the sixth filtering branch and between the fourth filtering cavity of the sixth filtering branch and the sixth filtering cavity of the sixth filtering branch, and capacitive cross coupling is performed between the sixth filtering cavity of the sixth filtering branch and the eighth filtering cavity of the sixth filtering branch, so that three coupling zeros are formed.

10. A communication device comprising an antenna and a radio frequency unit, the antenna being connected to the radio frequency unit, the radio frequency unit comprising a filter according to any one of claims 1 to 9 for filtering radio frequency signals.