CN113054358A

CN113054358A - Communication equipment and filter

Info

Publication number: CN113054358A
Application number: CN201911381091.7A
Authority: CN
Inventors: 杨绍春; 张海峰; 王磊; 何慧华
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The application discloses communication equipment and wave filter, this wave filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of thirteen filtering cavities which are sequentially coupled to form five cross-coupling zeros of the first filtering branch; thirteen filter cavities of the first filter branch form three rows arranged along the first direction in a closest packing mode, and the distance between any two adjacent filter cavities in the first filter branch is a preset threshold value. The first filtering branch is regularly divided into three rows for arrangement, and the distance between any two adjacent filtering cavities is a preset threshold value, so that the arrangement rule of the first filtering branch can be compact, and the size of the filter is reduced.

Description

Communication equipment and filter

Technical Field

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

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 accurately control its upper and lower limit frequencies. And should also consider maintaining high isolation between the passbands of the channels if both transmit and receive channels are present.

The inventor of this application discovers in long-term research and development work that present wave filter sets up a plurality of filtering chambeies, and the arrangement of a plurality of filtering chambeies is irregular to the distance between filtering chamber and the filtering chamber is inequality, has increased the volume of wave filter, has increased manufacturing cost.

Disclosure of Invention

The application provides a communication device and a filter, which are used for solving the problems of the filter in the prior art.

In order to solve the above technical problem, the present application provides a filter, including: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of thirteen filtering cavities which are sequentially coupled to form five cross-coupling zeros of the first filtering branch; thirteen filter cavities of the first filter branch form three rows arranged along the first direction in a closest packing mode, and the distance between any two adjacent filter cavities in the first filter branch is a preset threshold value.

The second filtering cavity, the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are arranged in a regular hexagon and are all arranged adjacent to the sixth filtering cavity of the first filtering branch; the sixth filtering cavity, the seventh filtering cavity, the eighth filtering cavity, the twelfth filtering cavity, the eleventh filtering cavity and the tenth filtering cavity of the first filtering branch are arranged in a regular hexagon and are all arranged adjacent to the ninth filtering cavity of the first filtering branch. The plurality of filter cavities are arranged adjacently, so that the size of the filter can be reduced.

The first filtering cavity, the second filtering cavity, the tenth filtering cavity, the eleventh filtering cavity and the thirteenth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction; the third filtering cavity, the sixth filtering cavity, the ninth filtering cavity and the twelfth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction; the fourth filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction. The first filtering branch circuit is regularly divided into three rows for arrangement, so that the same die can be used for manufacturing a plurality of filters, and the production cost is reduced.

The third filter cavity of the first filter branch is respectively adjacent to the first filter cavity, the second filter cavity, the sixth filter cavity, the fifth filter cavity and the fourth filter cavity of the first filter branch; the twelfth filtering cavity of the first filtering branch is respectively adjacent to the thirteenth filtering cavity, the eleventh filtering cavity, the ninth filtering cavity and the eighth filtering cavity of the first filtering branch. The plurality of filter cavities are arranged adjacently, so that the size of the filter can be reduced.

The capacitive cross coupling is respectively formed between the third filter cavity and the fifth filter cavity of the first filter branch, between the seventh filter cavity and the ninth filter cavity of the first filter branch, between the first filter cavity and the third filter cavity of the first filter branch, between the sixth filter cavity and the ninth filter cavity of the first filter branch, and between the ninth filter cavity and the eleventh filter cavity of the first filter branch, so as to form five cross coupling zeros of the first filter branch. The first filtering branch forms five cross-coupling zero points, and the effect of zero point suppression can be realized.

The bandwidth range of the first filtering branch is 2514-2676MHz, and the design parameter requirement of the filter can be met.

The filter comprises a second filtering branch and thirteen filtering cavities which are sequentially coupled, wherein the first filtering cavity to the sixth filtering cavity of the second filtering branch are symmetrically arranged with the first filtering cavity to the sixth filtering cavity of the first filtering branch, and the seventh filtering cavity to the thirteenth filtering cavity of the second filtering branch are identical to the seventh filtering cavity to the thirteenth filtering cavity of the first filtering branch in structure. Through setting up that part filtering branch is the same with the structure of first filtering branch, the second filtering branch that part filtering branch and the symmetry of first filtering branch set up, and first filtering branch rule sets up, can realize the rule setting of second filtering branch, reduces the volume of wave filter.

The fourth filter cavity of the second filter branch is adjacent to the fourth filter cavity of the first filter branch; a fifth filter cavity of the second filter branch is arranged adjacent to the fifth filter cavity of the first filter branch; the tenth filter cavity of the second filter branch is adjacent to the seventh filter cavity of the first filter branch; and the eleventh filter cavity of the second filter branch circuit and the eighth filter cavity of the first filter branch circuit are arranged adjacently. The plurality of filter cavities are arranged adjacently, so that the size of the filter can be reduced.

The bandwidth range of the second filtering branch is 2514-2676MHz, and the design parameter requirement of the filter can be met.

In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a communication device comprising the filter as described above and a communication base station that transceives radio frequency signals through the filter.

The beneficial effect of this application is: in distinction from the prior art, the present application provides a filter comprising: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of thirteen filtering cavities which are sequentially coupled to form five cross-coupling zeros of the first filtering branch; thirteen filter cavities of the first filter branch form three rows arranged along the first direction in a closest packing mode, and the distance between any two adjacent filter cavities in the first filter branch is a preset threshold value. The first filtering branches are regularly divided into three rows and arranged, and the distance between any two adjacent filtering cavities is a preset threshold value, so that the arrangement of the first filtering branches is tight and regular, and the size of the filter is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced 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 based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of a filter provided in the present application;

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

FIG. 3 is a schematic diagram of a second embodiment of a filter provided herein;

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

fig. 5 is a diagram of simulation results of a first filtering branch provided in the present application;

fig. 6 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 filter according to a first embodiment of the present disclosure. The filter 1 comprises a housing 10 and a first filter branch 20.

The housing 10 has a first direction i and a second direction ii, and the first direction i of the housing 10 and the second direction ii of the housing 10 are arranged perpendicularly.

The first filtering branch 20 is disposed on the housing 10 and is composed of thirteen filtering cavities 21 coupled in sequence, and the thirteen filtering cavities 21 further form five cross-coupling zeros 22, as shown in fig. 1, which can implement zero suppression and facilitate debugging. The thirteen filter cavities 21 of the first filter branch 20 are specifically the first filter cavity a1 through the thirteenth filter cavity a13 of the first filter branch 20. The distance between any two adjacent filter cavities of the first filter branch 20 is a preset threshold value, so that the filter cavities of the first filter branch 20 are arranged regularly and tightly, the size of the filter 1 is reduced, and the production cost is reduced.

As shown in fig. 1, the thirteen filter cavities 21 of the first filter branch 20 are formed in the closest packing in three rows arranged along the first direction i of the housing 10.

It should be noted that the closest packing is an arrangement of circles; in the closest packing, many equal diameter circles are juxtaposed, and the space utilization thereof reaches the maximum. In the two-dimensional closest packing mode, adjacent isodiametric balls in the dense layer are tangent, and the centers of 3 pairwise tangent isodiametric circles form an equilateral triangle. Some triangle-like gaps are left between the circles.

Specifically, the first filter cavity a1, the second filter cavity a2, the tenth filter cavity a10, the eleventh filter cavity a11 and the thirteenth filter cavity a13 are in a row and are sequentially arranged along the second direction ii of the housing 10; the third filter cavity A3, the sixth filter cavity A6, the ninth filter cavity A9 and the twelfth filter cavity A12 are in a row and are sequentially arranged along the second direction II of the shell 10; the fourth filter chamber a4, the fifth filter chamber a5, the seventh filter chamber a7 and the eighth filter chamber A8 are aligned in a row and are sequentially arranged along the second direction ii of the housing 10.

The second filtering cavity a2, the third filtering cavity A3, the fifth filtering cavity a5, the seventh filtering cavity a7, the ninth filtering cavity a9 and the tenth filtering cavity a10 are arranged in a regular hexagon and are all arranged adjacent to the sixth filtering cavity a 6; the sixth filtering cavity A6, the seventh filtering cavity A7, the eighth filtering cavity A8, the twelfth filtering cavity A12, the eleventh filtering cavity A11 and the tenth filtering cavity A10 are arranged in a regular hexagon and are all arranged adjacent to the ninth filtering cavity A9; the third filtering cavity A3 is respectively adjacent to the first filtering cavity A1, the second filtering cavity A2, the sixth filtering cavity A6, the fifth filtering cavity A5 and the fourth filtering cavity A4; the twelfth filter cavity a12 is respectively disposed adjacent to the thirteenth filter cavity a13, the eleventh filter cavity a11, the ninth filter cavity a9 and the eighth filter cavity A8.

The thirteen filter cavities 21 of the first filter branch 20 are regularly distributed in three rows, which can reduce the volume of the filter 1. Meanwhile, a plurality of filters 1 can be produced by using the same die, index parameters of the filters 1 are flexibly adjusted, and intermodulation of zero points is improved.

As shown in fig. 2, fig. 2 is a schematic diagram of a topology of a first filtering branch provided in the present application. Capacitive cross coupling is respectively performed between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 20, between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 20, between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 20, between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 20, and between the ninth filter cavity a9 and the eleventh filter cavity a11 of the first filter branch 20, so as to form five cross coupling zeros 22 of the first filter branch 20.

Specifically, a window may be disposed between the third filter cavity A3 and the fifth filter cavity a5, and a flying bar may be disposed at the window, so that the third filter cavity A3 and the fifth filter cavity a5 are capacitively cross-coupled to form a cross-coupling zero 22 of the first filter branch 20, which is equivalent to the capacitor C1 described in fig. 2. A window may be disposed between the seventh filter cavity a7 and the ninth filter cavity a9, and a flying bar is disposed at the window, so that the seventh filter cavity a7 and the ninth filter cavity a9 are capacitively cross-coupled to form a cross-coupling zero 22 of the first filter branch 20, which is equivalent to the capacitor C2 illustrated in fig. 2.

A window may be disposed between the first filter cavity a1 and the third filter cavity A3, and a metal coupling rib is disposed on the window, so that the first filter cavity a1 and the third filter cavity A3 realize inductive cross coupling, and a cross coupling zero 22 of the first filter branch 20 is formed, which is equivalent to the inductor L1 described in fig. 2. A window may be disposed between the sixth filter cavity a6 and the ninth filter cavity a9, and a metal coupling rib is disposed on the window, so that the sixth filter cavity a6 and the ninth filter cavity a9 realize inductive cross coupling, and a cross coupling zero 22 of the first filter branch 20 is formed, which is equivalent to the inductor L2 described in fig. 2. A window may be disposed between the ninth filter cavity a9 and the eleventh filter cavity a11, and a metal coupling rib is disposed on the window, so that the ninth filter cavity a9 and the eleventh filter cavity a11 realize inductive cross coupling, and a cross coupling zero 22 of the first filter branch 20 is formed, which is equivalent to the inductor L3 described in fig. 2.

In this embodiment, the first filter cavity a1, the second filter cavity a2, the third filter cavity A3, the fourth filter cavity a4, the fifth filter cavity a5, the sixth filter cavity A6, the seventh filter cavity a7, the eighth filter cavity A8, the ninth filter cavity a9, the tenth filter cavity a10, the eleventh filter cavity a11, the twelfth filter cavity a12, and the thirteenth filter cavity a13 of the first filter branch 20 may have the same size, that is, the thirteen filter cavities 21 of the first filter branch 20 may be distributed equidistantly, so as to facilitate layout and debugging and improve the uniformity of the filter 1.

Optionally, the housing 10 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 20 is connected with the first port, and the thirteenth filter cavity a13 of the first filter branch 20 is connected with the second port. Both the first port and the second port can be taps of the filter 1 and are connected with an external connector.

Referring further to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the filter provided in the present application. On the basis of the above embodiment, the filter 1 further comprises a second filtering branch 30.

The second filtering branch 30 is disposed on the housing 10 and is composed of thirteen filtering cavities 31 coupled in sequence, and the thirteen filtering cavities 31 further form five cross-coupling zeros 32, as shown in fig. 3, which can implement zero suppression and facilitate debugging. The second filter branch 30 is disposed adjacent to the first filter branch 20. The thirteen filter cavities 31 of the second filter branch 30 are specifically the first filter cavity B1 through the thirteenth filter cavity B13 of the second filter branch 30. The distance between any two adjacent filter cavities of the second filter branch 30 is a preset threshold value, so that the filter cavities of the second filter branch 30 are arranged regularly and tightly, the size of the filter 1 is reduced, and the production cost is reduced.

As shown in fig. 3, the thirteen filter cavities 31 of the second filter branch 30 are formed in the closest packing in three rows arranged along the first direction i of the housing 10. The first filtering cavity B1 through the sixth filtering cavity B6 of the second filtering branch 30 and the first filtering cavity a1 through the sixth filtering cavity a6 of the first filtering branch 20 are symmetrically arranged, and the seventh filtering cavity B7 through the thirteenth filtering cavity B13 of the second filtering branch 30 are identical to the seventh filtering cavity a7 through the thirteenth filtering cavity a13 of the first filtering branch 20 in structure.

Specifically, the first filter cavity B1, the second filter cavity B2, the seventh filter cavity B7 and the eighth filter cavity B8 are in a row and are sequentially arranged along the second direction ii of the housing 10; the third filter cavity B3, the sixth filter cavity B6, the ninth filter cavity B9 and the twelfth filter cavity B12 are in a row and are sequentially arranged along the second direction II of the shell 10; the fourth filter cavity B4, the fifth filter cavity B5, the tenth filter cavity B10, the eleventh filter cavity B11 and the thirteenth filter cavity B13 are arranged in a row and are sequentially arranged along the second direction ii of the housing 10.

The second filter cavity B2, the third filter cavity B3, the fifth filter cavity B5, the tenth filter cavity B10, the ninth filter cavity B9 and the seventh filter cavity B7 are arranged in a regular hexagon and are all arranged adjacent to the sixth filter cavity B6; the sixth filtering cavity B6, the seventh filtering cavity B7, the eighth filtering cavity B8, the twelfth filtering cavity B12, the eleventh filtering cavity B11 and the tenth filtering cavity B10 are arranged in a regular hexagon and are all arranged adjacent to the ninth filtering cavity B9; the third filtering cavity B3 is respectively adjacent to the first filtering cavity B1, the second filtering cavity B2, the sixth filtering cavity B6, the fifth filtering cavity B5 and the fourth filtering cavity B4; the twelfth filter chamber B12 is disposed adjacent to the thirteenth filter chamber B13, the eleventh filter chamber B11, the ninth filter chamber B9 and the eighth filter chamber B8, respectively.

And, the fourth filter cavity B4 of the second filter branch 30 is disposed adjacent to the fourth filter cavity a4 of the first filter branch 20; the fifth filter cavity B5 of the second filter branch 30 is disposed adjacent to the fifth filter cavity a5 of the first filter branch 20; the tenth filter cavity B10 of the second filter branch 30 is disposed adjacent to the seventh filter cavity a7 of the first filter branch 20; the eleventh filter cavity B11 of the second filter branch 30 is disposed adjacent to the eighth filter cavity a8 of the first filter branch 20.

The thirteen filter cavities 31 of the second filter branch 30 are regularly distributed in three rows, which can reduce the volume of the filter 1.

As shown in fig. 4, fig. 4 is a schematic diagram of a topology of a second filtering branch provided in the present application. Capacitive cross coupling is respectively performed between the third filter cavity B3 and the fifth filter cavity B5 of the second filter branch 30, between the seventh filter cavity B7 and the ninth filter cavity B9 of the second filter branch 30, between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 30, between the sixth filter cavity B6 and the ninth filter cavity B9 of the second filter branch 30, and between the ninth filter cavity B9 and the eleventh filter cavity B11 of the second filter branch 30, so as to form five cross coupling zeros 32 of the second filter branch 30.

Specifically, a window may be disposed between the third filter cavity B3 and the fifth filter cavity B5, and a flying bar may be disposed at the window, so that the third filter cavity B3 and the fifth filter cavity B5 are capacitively cross-coupled to form a cross-coupling zero 32 of the second filter branch 30, which is equivalent to the capacitor C3 illustrated in fig. 4. A window may be disposed between the seventh filter cavity B7 and the ninth filter cavity B9, and a flying bar is disposed at the window, so that the seventh filter cavity B7 and the ninth filter cavity B9 achieve capacitive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the capacitor C4 illustrated in fig. 4.

A window may be disposed between the first filter cavity B1 and the third filter cavity B3, and a metal coupling rib is disposed on the window, so that the ninth filter cavity B9 and the eleventh filter cavity B11 realize inductive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the inductor L4 shown in fig. 4. A window may be disposed between the sixth filter cavity B6 and the ninth filter cavity B9, and a metal coupling rib is disposed on the window, so that the sixth filter cavity B6 and the ninth filter cavity B9 realize inductive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the inductor L5 described in fig. 4. A window may be disposed between the ninth filter cavity B9 and the eleventh filter cavity B11, and a metal coupling rib is disposed on the window, so that the ninth filter cavity B9 and the eleventh filter cavity B11 realize inductive cross coupling, and a cross coupling zero 32 of the second filter branch 30 is formed, which is equivalent to the inductor L6 shown in fig. 4.

In this embodiment, the first filter cavity B1, the second filter cavity B2, the third filter cavity B3, the fourth filter cavity B4, the fifth filter cavity B5, the sixth filter cavity B6, the seventh filter cavity B7, the eighth filter cavity B8, the ninth filter cavity B9, the tenth filter cavity B10, the eleventh filter cavity B11, the twelfth filter cavity B12, and the thirteenth filter cavity B13 of the second filter branch 30 may have the same size, that is, the thirteen filter cavities 31 of the second filter branch 30 may be distributed at equal intervals, so as to facilitate layout and debugging and improve the uniformity of the filter 1.

Optionally, a third port (not shown) and a fourth port (not shown) are further disposed on the housing 10, the first filter cavity B1 of the second filter branch 30 is connected to the third port, and the thirteenth filter cavity B13 of the second filter branch 30 is connected to the fourth port. Wherein, the third port and the fourth port can be taps of the filter 1 and are connected with an external connector.

The bandwidth of the first filtering branch 20 of the present embodiment is in the range of 2514Mhz-2676 Mhz. Specifically, the coupling bandwidth between the first port and the first filter cavity A1 ranges from 141Mhz to 161 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 87Mhz to 101 Mhz; the coupling bandwidth between the first filter cavity a1 and the third filter cavity A3 ranges from 74Mhz-87 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 53Mhz to 64 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 68Mhz to 80 Mhz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity a5 ranges from (-38) Mhz- (-30) Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 64Mhz to 76 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 ranges from 71Mhz to 84 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 71Mhz to 84 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the ninth filter cavity a9 ranges from 2Mhz to 7 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the eighth filter cavity A8 ranges from 57Mhz to 68 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the ninth filter cavity a9 ranges from (-42) Mhz- (-34) Mhz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 62Mhz-74 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 ranges from 70Mhz to 82 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the eleventh filter cavity a11 ranges from 17Mhz to 24 Mhz; the coupling bandwidth between the tenth filter cavity a10 and the eleventh filter cavity a11 ranges from 72Mhz to 85 Mhz; the coupling bandwidth between the eleventh filter cavity a11 and the twelfth filter cavity a12 ranges from 81Mhz to 95 Mhz; the coupling bandwidth between the twelfth filter cavity a12 and the thirteenth filter cavity a13 ranges from 115Mhz to 133 Mhz; the coupling bandwidth between the thirteenth filter cavity a13 and the second port is in the range of 141Mhz-161Mhz, which can meet the design requirements.

Therefore, the resonant frequencies of the first filter cavity a1 through the thirteenth filter cavity a13 of the first filter branch 20 are sequentially located in the following ranges: 2592Mhz-2594Mhz, 2651Mhz-2653Mhz, 2586Mhz-2588Mhz, 2555Mhz-2557Mhz, 2592Mhz-2594Mhz, 2590Mhz-2592Mhz, 2552Mhz-2554Mhz, 2592Mhz-2594Mhz, 2614Mhz-2616Mhz, 2592Mhz-2594Mhz, and 2592Mhz-2594 Mhz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

As shown in fig. 5, fig. 5 is a schematic diagram of a simulation result of the first filtering branch provided in the present application. Through experimental tests, the bandwidth of the first filtering branch 20 of the present application is in the range of 2514Mhz-2676Mhz, as shown by the frequency band curve 50 in fig. 5. The first filtering branch 20 of the present application has a bandwidth suppression greater than or equal to 75dB between 2400Mhz and 2483.5Mhz, a bandwidth suppression greater than or equal to 53dB between 2483.5Mhz and 2500Mhz, a bandwidth suppression greater than or equal to 53dB between 2700Mhz and 2758.6Mhz, and a bandwidth suppression greater than or equal to 70dB between 2758.6Mhz and 2900Mhz, so that the out-of-band suppression performance of the filter 1 can be improved. Wherein, a cross coupling zero point D of the first filtering branch 20 is located in the range of 2450Mhz to 2500Mhz, the suppression is greater than 120dB, and the parameter design requirement of the filter 1 is met.

The coupling zero is also referred to as a transmission zero. 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.

It should be noted that the parameters (e.g., frequency point and suppression) of two or more coupling zeros of the present application may be the same; in the simulation diagram, the coupling zeros of the same parameters are shown as the same coupling zeros.

The bandwidth of the second filtering branch 30 of the present embodiment is in the range of 2514Mhz-2676 Mhz. Specifically, the coupling bandwidth between the third port and the first filter cavity B1 ranges from 141Mhz to 161 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 87Mhz to 101 Mhz; the coupling bandwidth between the first filter cavity B1 and the third filter cavity B3 ranges from 74Mhz-87 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 53Mhz to 64 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 68Mhz to 80 Mhz; the coupling bandwidth between the third filter cavity B3 and the fifth filter cavity B5 ranges from (-38) Mhz- (-30) Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 64Mhz to 76 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 71Mhz to 84 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 ranges from 71Mhz to 84 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the ninth filter cavity B9 ranges from 2Mhz to 7 Mhz; the coupling bandwidth between the seventh filter cavity B7 and the eighth filter cavity B8 ranges from 57Mhz to 68 Mhz; the coupling bandwidth between the seventh filter cavity B7 and the ninth filter cavity B9 ranges from (-42) Mhz- (-34) Mhz; the coupling bandwidth between the eighth filter cavity B8 and the ninth filter cavity B9 ranges from 62Mhz-74 Mhz; the coupling bandwidth between the ninth filter cavity B9 and the tenth filter cavity B10 ranges from 70Mhz to 82 Mhz; the coupling bandwidth between the ninth filter cavity B9 and the eleventh filter cavity B11 ranges from 17Mhz to 24 Mhz; the coupling bandwidth between the tenth filter cavity B10 and the eleventh filter cavity B11 ranges from 72Mhz-85 Mhz; the coupling bandwidth between the eleventh filter cavity B11 and the twelfth filter cavity B12 ranges from 81Mhz to 95 Mhz; the coupling bandwidth between the twelfth filter cavity B12 and the thirteenth filter cavity B13 ranges from 115Mhz to 133 Mhz; the coupling bandwidth between the thirteenth filter cavity B13 and the fourth port ranges from 141Mhz to 161Mhz, which can meet the design requirement.

Therefore, the resonant frequencies of the first filter cavity B1 through the thirteenth filter cavity B13 of the second filter branch 30 are sequentially located in the following ranges: 2592Mhz-2594Mhz, 2651Mhz-2653Mhz, 2586Mhz-2588Mhz, 2555Mhz-2557Mhz, 2592Mhz-2594Mhz, 2590Mhz-2592Mhz, 2552Mhz-2554Mhz, 2592Mhz-2594Mhz, 2614Mhz-2616Mhz, 2592Mhz-2594Mhz, and 2592Mhz-2594 Mhz. Therefore, the resonant frequencies of the resonant cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

The simulation result diagram of the second filtering branch 30 is consistent with the simulation result diagram of the first filtering branch 20, as shown in fig. 5, and is not repeated herein.

The present application further provides a communication device, as shown in fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device 60 includes an antenna 61 and a Radio frequency Unit 62(Radio Remote Unit, RRU), where the antenna 61 is connected to the Radio frequency Unit 62, and the Radio frequency Unit 62 includes a filter 1 as shown in the above embodiment, and the filter 1 is configured to filter a Radio frequency signal. In other embodiments, the rf Unit 62 may be integrally designed with the Antenna 61 to form an Active Antenna Unit (AAU).

Some embodiments of the present application are referred to as filters and may also be referred to as combiners, i.e., dual-frequency combiners.

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

Claims

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

a housing having a first direction and a second direction perpendicular to each other;

the first filtering branch is arranged on the shell and consists of thirteen filtering cavities which are coupled in sequence, and five cross-coupling zero points of the first filtering branch are formed;

thirteen filter cavities of the first filter branch circuit form three rows arranged along the first direction in a closest packing mode, and the distance between any two adjacent filter cavities in the first filter branch circuit is a preset threshold value.

2. The filter of claim 1,

the second filtering cavity, the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are arranged in a regular hexagon and are all arranged adjacent to the sixth filtering cavity of the first filtering branch;

and the sixth filtering cavity, the seventh filtering cavity, the eighth filtering cavity, the twelfth filtering cavity, the eleventh filtering cavity and the tenth filtering cavity of the first filtering branch are arranged in a regular hexagon and are all arranged adjacent to the ninth filtering cavity of the first filtering branch.

3. The filter of claim 2,

the first filtering cavity, the second filtering cavity, the tenth filtering cavity, the eleventh filtering cavity and the thirteenth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction;

the third filtering cavity, the sixth filtering cavity, the ninth filtering cavity and the twelfth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction;

and the fourth filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the second direction.

4. The filter of claim 3,

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

and the twelfth filtering cavity of the first filtering branch is respectively adjacent to the thirteenth filtering cavity, the eleventh filtering cavity, the ninth filtering cavity and the eighth filtering cavity of the first filtering branch.

5. The filter of claim 4,

capacitive cross coupling is respectively performed between the third filtering cavity and the fifth filtering cavity of the first filtering branch, between the seventh filtering cavity and the ninth filtering cavity of the first filtering branch, inductive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the first filtering branch, between the sixth filtering cavity and the ninth filtering cavity of the first filtering branch, and between the ninth filtering cavity and the eleventh filtering cavity of the first filtering branch, so that five cross coupling zeros of the first filtering branch are formed.

6. The filter of claim 1 wherein the bandwidth of the first filtering branch is 2514-2676 MHz.

7. The filter according to claim 4, wherein the filter comprises a second filtering branch, which is composed of thirteen filtering cavities coupled in sequence, the first filtering cavity to the sixth filtering cavity of the second filtering branch are symmetrically arranged with the first filtering cavity to the sixth filtering cavity of the first filtering branch, and the seventh filtering cavity to the thirteenth filtering cavity of the second filtering branch have the same structure with the seventh filtering cavity to the thirteenth filtering cavity of the first filtering branch.

8. The filter of claim 7,

a fourth filter cavity of the second filter branch is adjacent to the fourth filter cavity of the first filter branch;

a fifth filter cavity of the second filter branch is adjacent to the fifth filter cavity of the first filter branch;

a tenth filter cavity of the second filter branch is adjacent to a seventh filter cavity of the first filter branch;

and the eleventh filter cavity of the second filter branch circuit and the eighth filter cavity of the first filter branch circuit are arranged adjacently.

9. The filter of claim 7 wherein the bandwidth of the second filtering branch is 2514-2676 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 a radio frequency signal.