CN113036372A

CN113036372A - Filter and communication equipment

Info

Publication number: CN113036372A
Application number: CN201911361431.XA
Authority: CN
Inventors: 杨绍春; 钟志波; 张宝真; 王贺
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 perpendicular to the first direction; the first filtering branch is arranged on the shell and consists of six filtering cavities which are sequentially coupled, the nth filtering cavity and the (n + 1) th filtering cavity of the first filtering branch are arranged in an intersecting manner, and n is an integer which is greater than or equal to 1 and less than 6. In this way, this application is through reducing the distance between nth filter chamber and the (n + 1) th filter chamber, strengthens the coupling strength between nth filter chamber and the (n + 1) th filter chamber to the filter chamber that makes the wave filter closely arranges, reduces the volume of wave filter.

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 device, 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.

The inventor of the application discovers in long-term research and development work that the filtering cavities in the prior art comprise a plurality of filtering cavities, a separation wall is often required to be arranged between two sequentially coupled filtering cavities, then a coupling window is arranged on the separation wall, the processing steps are complicated, and the coupling strength between two adjacent filtering cavities is weak due to the fact that the center distance between the two adjacent filtering cavities is long, and the size of the filter is increased.

Disclosure of Invention

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

To solve the above problem, an embodiment of the present application provides a filter, where 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 six filtering cavities which are sequentially coupled, the nth filtering cavity and the (n + 1) th filtering cavity of the first filtering branch are arranged in an intersecting mode, and n is an integer which is larger than or equal to 1 and smaller than 6.

In order to solve the above problem, an embodiment of the present application provides a communication device, where the communication device includes an antenna and a radio frequency unit connected to the antenna, and the radio frequency unit includes the above filter and is configured to filter a radio frequency signal.

Different from the situation of the prior art, the filter of the application consists of six filter cavities which are sequentially coupled, the nth filter cavity and the (n + 1) th filter cavity of the first filter branch are intersected, namely the two filter cavities which are sequentially coupled in the first filter branch are intersected, so that a separation wall is prevented from being required to be arranged between the two filter cavities which are sequentially coupled in the traditional filter, then a coupling window is arranged on the separation wall, the materials are reduced, and the processing is convenient; in addition, the distance between the nth filter cavity and the (n + 1) th filter cavity is reduced, and the coupling strength between the nth filter cavity and the (n + 1) th filter cavity is enhanced, so that the filter cavities of the filter are closely arranged, and the size of the filter is reduced.

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 the topology of the first filtering branch of FIG. 1;

FIG. 3 is a diagram illustrating simulation results of the filter of the present application;

FIG. 4 is a schematic diagram of the structure of a second embodiment of the filter of the present application;

FIG. 5 is a schematic diagram of the topology of the second filtering branch of FIG. 4;

fig. 6 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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a filter according to the present application. The filter 10 of this embodiment includes the casing 11 and first filtering branch 12, and first filtering branch 12 sets up on casing 11, comprises six filter chambers of coupling in proper order, and six filter chambers of first filtering branch 12 divide into first filter chamber A1, second filter chamber A2, third filter chamber A3, fourth filter chamber A4, fifth filter chamber A5 and sixth filter chamber A6 of first filtering branch 12.

The nth filter cavity and the (n + 1) th filter cavity of the first filter branch 12 are arranged in an intersecting manner, n is an integer greater than or equal to 1 and less than 6, that is, two filter cavities sequentially coupled in the first filter branch 12 are arranged in an intersecting manner. Specifically, the first filter cavity a1 and the second filter cavity a2 of the first filter branch 12 are arranged in an intersecting manner, the second filter cavity a2 and the third filter cavity A3 of the first filter branch 12 are arranged in an intersecting manner, the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 12 are arranged in an intersecting manner, the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 12 are arranged in an intersecting manner, and the fifth filter cavity a5 and the sixth filter cavity a6 of the first filter branch 12 are arranged in an intersecting manner.

Because the nth filter cavity and the (n + 1) th filter cavity of the first filter branch 12 are intersected, the distance between the nth filter cavity and the (n + 1) th filter cavity is reduced, namely, the distance between the center of the nth filter cavity and the center of the (n + 1) th filter cavity is reduced, and then the coupling strength between the nth filter cavity and the (n + 1) th filter cavity is enhanced, so that the filter cavities of the filter 10 are closely arranged, and the size of the filter 10 is reduced.

Taking first filter cavity a1 and second filter cavity a2 of first filter arm 12 as an example, first filter cavity a1 and second filter cavity a2 are disposed to intersect to form intersection points C and D. A window (not shown) is arranged between the first filtering cavity A1 and the second filtering cavity A2, the width of the window is equal to the distance between the intersection points C and D, through the intersection arrangement of the filtering cavities, the situation that a partition wall needs to be arranged between two filtering cavities which are sequentially coupled in a traditional filter is avoided, then a coupling window is arranged on the partition wall, materials are reduced, and the processing is convenient. .

The window between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 12 may form a coupling zero, which is also referred to as a transmission zero, and thus zero suppression can be achieved, which is convenient for debugging indexes. 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.

In other embodiments, a metal stiffener may be disposed between first filter cavity a1 and second filter cavity a2, and the metal stiffener passes through the window to connect the center of first filter cavity a1 and the center of second filter cavity a2 to enhance the coupling strength between first filter cavity a1 and second filter cavity a 2.

The housing 11 has a first direction L1 and a second direction L2 perpendicular to the first direction L1, the first direction L1 may be a width direction of the housing 11, and the second direction L2 may be a length direction of the housing 11. The first filtering cavity a1 to the fifth filtering cavity a5 of the first filtering branch 12 are divided into two columns arranged along the first direction L1, and the sizes of the first filtering cavity a1 to the sixth filtering cavity a6 of the first filtering branch 12 can be the same, so that the layout and debugging are facilitated, and the consistency of the filter 10 is improved.

Specifically, the first filter cavity a1, the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 12 are in a row and arranged along the second direction L2; the second filter cavity a2 and the fourth filter cavity a4 of the first filter branch 12 are in a column and arranged along the second direction L2. The second filter cavity a2 of the first filter branch 12 intersects with the first filter cavity a1 and the third filter cavity A3 of the first filter branch 12, respectively; the fourth filter cavity a4 of the first filter branch 12 intersects with the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 12, respectively. Therefore, the first filter cavity a1 through the fifth filter cavity a5 of the first filter branch 12 are regularly distributed, which facilitates layout to reduce the size of the filter 10.

The sixth filter cavity a6 of the first filter branch 12 intersects with the fifth filter cavity a5 of the first filter branch 12, the sixth filter cavity a6 of the first filter branch 12 is away from the bisector 111 of the housing 11 in the second direction L2 with respect to the fifth filter cavity a5 of the first filter branch 12, and an included angle a between a connecting line 121 between a center of the sixth filter cavity a6 of the first filter branch 12 and a center of the fifth filter cavity a5 and the bisector 111 is an acute angle, for example, the included angle a is 70 ° to 85 °.

The fourth filtering cavity a4 to the sixth filtering cavity a6 of the first filtering branch 12 are arranged in a triangle; the projection of the center of the fifth filter cavity a5 of the first filter branch 12 in the second direction L2 is located between the center of the sixth filter cavity a6 of the first filter branch 12 and the projection of the center of the fourth filter cavity a4 in the second direction L2; the projection of the center of the sixth filter cavity a6 of the first filter branch 12 in the first direction L1 is located between the center of the fifth filter cavity a5 of the first filter branch 12 and the projection of the center of the fourth filter cavity a4 in the first direction L1.

Therefore, the first filter cavity a1 to the sixth filter cavity a6 of the first filter branch 12 of the present embodiment may be arranged in a serpentine shape, so that the first filter cavity a1 to the sixth filter cavity a6 of the first filter branch 12 are compactly arranged; in addition, the present embodiment can satisfy the bandwidth requirement only through six filter cavities of the first filter branch 12, and further can reduce the number of filter cavities and the volume of the filter 10. As shown in fig. 2, fig. 2 is a schematic topology diagram of the first filtering branch in fig. 1. The first filter cavity a1 to the sixth filter cavity a6 of the first filter branch 12 are sequentially arranged in an intersecting manner, and no cross coupling is arranged, so that the topological diagram of the first filter branch 12 is a straight line.

Wherein, the housing 11 is further provided with a first port (not shown) and a second port (not shown), the first filter cavity a1 of the first filter branch 12 is coupled with the first port, and the sixth filter cavity a6 of the first filter branch 12 is coupled with the second port. Wherein the first port and the second port may both be taps of the filter 10.

In the first filtering branch 12, the coupling bandwidth between the first port and the first filtering cavity a1 is in the range: 527- & lt589 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 is in the range of 412 and 462 MHz; the coupling bandwidth between the second filter cavity A2 and the third filter cavity A3 is in the range of 286 and 322 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 is 271-305 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 is in the range of 286-322 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 is in the range of 412 and 462 MHz; the coupling bandwidth between the sixth filter cavity a6 and the second port ranges from: 527- & lt589 MHz.

Therefore, the resonant frequencies of the first filter cavity a1 through the sixth filter cavity a6 of the first filter branch 12 are sequentially located in the following ranges:

1937-1940MHz, 1937-1940MHz and 1937-1940 MHz.

Therefore, the bandwidth of the first filtering branch 12 of the present embodiment is within the range of 1709-2201MHz, which can meet the design requirement.

As shown in fig. 3, from the frequency band curve 31 simulated by the first filtering branch 12 in this embodiment, it can be obtained that the simulated bandwidth of the first filtering branch 12 is within the range of 1709-2201MHz, which meets the design requirement and can accurately control the bandwidth of the first filtering branch 12. The bandwidth suppression of the first filtering branch 12 in the frequency range of 2496-.

Referring further to fig. 4, fig. 4 is a schematic structural diagram of a second embodiment of the filter of the present application. The filter of the present embodiment is described on the basis of the filter 10 disclosed in the first embodiment.

The filter cavity 10 further includes a second filter branch 13, which is composed of five filter cavities coupled in sequence. The five filter cavities of the second filter branch 13 are divided into a first filter cavity B1, a second filter cavity B2, a third filter cavity B3, a fourth filter cavity B4 and a fifth filter cavity B5 of the second filter branch 13.

The five filter cavities of the second filter branch 13 are in a row and are sequentially arranged along the second direction L2, that is, the first filter cavity B1, the second filter cavity B2, the third filter cavity B3, the fourth filter cavity B4 and the fifth filter cavity B5 of the second filter branch 13 are in a row and are sequentially arranged along the second direction L2; the first filtering cavity B1, the second filtering cavity B2, the third filtering cavity B3, the fourth filtering cavity B4 and the fifth filtering cavity B5 of the second filtering branch 13 are adjacently arranged in sequence. The third filtering cavity B3 of the second filtering branch 13 is adjacent to the third filtering cavity A3 of the first filtering branch 12, so as to reduce the distance between the second filtering branch 13 and the first filtering branch 12, and thus the miniaturization of the filter 10 is facilitated.

As shown in fig. 5, fig. 5 is a schematic diagram of the topology of the second filtering branch in fig. 4. The first filter cavity B1 to the fifth filter cavity B5 of the second filter branch 13 are sequentially arranged in an intersecting manner, and no cross coupling is provided, so that the topology of the second filter branch 13 is a straight line.

Wherein, the housing 11 is further provided with a third port (not shown) and a fourth port (not shown), the first filter cavity B1 of the second filter branch 13 is coupled with the third port, and the fifth filter cavity B5 of the second filter branch 13 is coupled with the fourth port. Wherein, the third port and the fourth port can be taps of the filter 10.

In the second filtering branch 13, the coupling bandwidth between the third port and the first filtering cavity B1 is in the range: 226-256 MHz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 is in the range of 177-202 MHz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 is in the range of 125-143 MHz; the coupling bandwidth range between the third filter cavity B3 and the fourth filter cavity B4 is 125-143 MHz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 is in the range of 177-202 MHz; the coupling bandwidth between the fifth filter cavity B5 and the fourth port ranges from: 26-256 MHz.

Therefore, the resonant frequencies of the first filter cavity B1 through the fifth filter cavity B5 of the second filter branch 13 are sequentially located in the following ranges:

2549, 2592, 2549, 2592 and 2592 MHz.

Therefore, the bandwidth of the second filtering branch 13 of the present embodiment is in the range of 2495-2691MHz, which can meet the design requirement.

As shown in fig. 3, from the frequency band curve 32 simulated by the second filtering branch 13 in this embodiment, it can be obtained that the bandwidth simulated by the second filtering branch 13 is within the range of 2495-2691MHz, which meets the design requirement and can accurately control the bandwidth of the second filtering branch 13. The bandwidth suppression of the second filtering branch 13 in the range of 1710-2200MHz is greater than 40dB, so that the out-of-band suppression performance of the second filtering branch 13 can be improved, and the isolation between the first filtering branch 12 and the second filtering branch 13 can be further improved.

The first filtering branch 12 disclosed in the present application may be a transmitting filtering branch or a receiving filtering branch, and the second filtering branch 13 may be a transmitting filtering branch or a receiving filtering branch.

The present application further provides a communication device, as shown in fig. 6, fig. 6 is a schematic diagram of an embodiment of the communication device of the present application.

The communication device of the present embodiment includes an antenna 62 and a radio frequency unit 61. The antenna 62 and the radio frequency unit 61 can be installed on a base station, and can also be installed on objects such as a street lamp; the antenna 62 is connected to a Radio Unit (RRU) 61. The rf unit 61 includes the filter 10 disclosed in the above embodiments for filtering the rf signal.

In other embodiments, the rf Unit 61 may be integrated with the Antenna 62 to form an Active Antenna Unit (AAU).

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;

2. The filter of claim 1,

the first to fifth filter cavities of the first filter branch are divided into two rows arranged along the first direction.

3. The filter of claim 2,

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

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

the second filter cavity of the first filter branch is respectively intersected with the first filter cavity and the third filter cavity of the first filter branch;

and the fourth filter cavity of the first filter branch is respectively intersected with the third filter cavity and the fifth filter cavity of the first filter branch.

4. The filter of claim 3,

the sixth filtering cavity of the first filtering branch and the fifth filtering cavity of the first filtering branch are arranged in an intersecting manner, the sixth filtering cavity of the first filtering branch is opposite to the fifth filtering cavity of the first filtering branch and faces the shell, the middle branch lines in the second direction are far away from the shell, and a connecting line of the center of the sixth filtering cavity of the first filtering branch and the center of the fifth filtering cavity and an included angle between the middle branch lines are acute angles.

5. The filter of claim 4,

the fourth filtering cavity to the sixth filtering cavity of the first filtering branch are arranged in a triangular mode, the center of the fifth filtering cavity of the first filtering branch is located in the projection in the second direction, the center of the sixth filtering cavity of the first filtering branch and the center of the fourth filtering cavity are located between the projections in the second direction, the center of the sixth filtering cavity of the first filtering branch is located in the projection in the first direction, and the center of the fifth filtering cavity of the first filtering branch and the center of the fourth filtering cavity are located between the projections in the first direction.

6. The filter of claim 5 wherein the bandwidth of the first filtering branch is 1709-2201 MHz.

7. The filter of claim 5, wherein the filter cavities comprise a second filter branch consisting of five filter cavities coupled in series.

8. The filter of claim 7,

the five filter cavities of the second filter branch are in a row and are sequentially arranged along the second direction.

9. The filter of claim 7,

the bandwidth range of the second filtering branch is 2495-2691 MHz.

10. A communication device, characterized in that the communication device comprises an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-9 for filtering radio frequency signals.