CN113054336A

CN113054336A - Communication device and filter thereof

Info

Publication number: CN113054336A
Application number: CN201911380948.3A
Authority: CN
Inventors: 钟志波; 蔡永宏; 唐梦军; 刘建伟
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 a communication device and a filter thereof. The 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 six filtering cavities which are sequentially coupled, the six filtering cavities in the first filtering branch further form two capacitive cross-coupling zero points of the first filtering branch, and the six filtering cavities in the first filtering branch are divided into two rows which are arranged along the second direction. Through the mode, the product complexity can be reduced, and the stability of the filter is improved.

Description

Communication device and filter thereof

Technical Field

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

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 includes not only the desired signal but also 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. The designed filter must therefore have its bandwidth precisely controlled.

The inventor of the application finds that the existing filter is provided with capacitive cross coupling and inductive cross coupling at the same time in long-term research and development work, and the product complexity is high due to the fact that materials of the capacitive cross coupling are different from materials of the inductive cross coupling, and the types of the materials needed by the filter are multiple.

Disclosure of Invention

In order to solve the above problems of the prior art filter, the present application provides a communication device and a filter thereof.

To solve the above problem, an embodiment of 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 six filtering cavities which are sequentially coupled, two capacitive cross-coupling zero points of the first filtering branch are formed, and the first filtering cavity to the sixth filtering cavity in the first filtering branch are divided into two rows arranged along the second direction.

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

Different from the situation of the prior art, the first filtering branch circuit of the capacitive cross coupling filter is composed of six filtering cavities which are sequentially coupled, and two capacitive cross coupling zero points are formed, so that zero point suppression can be realized, and the index debugging is facilitated; and the capacitive cross coupling is only arranged, and the same type of cross coupling is used, so that the material types can be reduced, the product complexity is reduced, and the stability of the filter is improved. In addition, first filtering chamber to sixth filtering chamber in the first filtering branch road divide into along the second direction two of arranging in this application, and the filtering chamber regular spread can make full use of the space of cavity, does benefit to the miniaturization of wave filter.

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 of the topology of the filter of FIG. 1;

FIG. 3 is a diagram showing simulation results of the filter of FIG. 1;

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 a third embodiment of the filter of the present application;

FIG. 7 is a schematic diagram of the topology of the third filtering branch of FIG. 6;

FIG. 8 is a schematic diagram of the structure of a fourth embodiment of the filter of the present application;

FIG. 9 is a schematic diagram of the topology of the fourth filtering branch of FIG. 8;

fig. 10 is a schematic structural 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.

The present application provides a filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of the filter of the present application. The filter 10 of the present embodiment includes a housing 11 and a first filter branch 121; the first filtering branch 121 may be a receiving filtering branch or a transmitting filtering branch.

The housing 11 has a first direction L and a second direction D, and the first direction L of the housing 11 is perpendicular to the second direction D of the housing 11. The first filtering branch 121 is disposed on the housing 11, and is composed of six filtering cavities 122 coupled in sequence, and two capacitive cross-coupling zeros of the first filtering branch 121 are formed, so that zero suppression can be realized, and debugging of indexes is facilitated.

The six filter cavities 122 of the first filter branch 121 are specifically the first filter cavity a1 through the sixth filter cavity a6 of the first filter branch 121, and are divided into two rows arranged along the second direction D. Specifically, the sixth filtering cavity a6, the fourth filtering cavity a4 and the first filtering cavity a1 of the first filtering branch 121 are in a row and are sequentially arranged along the first direction L; the fifth filter cavity a5, the third filter cavity A3, and the second filter cavity a2 of the first filter branch 121 are in a row and are sequentially arranged along the first direction L. The filter 10 has the advantages of regular cavity arrangement, cost saving, good material consistency and high stability.

The fourth filtering cavity a4 of the first filtering branch 121 is further disposed adjacent to the fifth filtering cavity a5, the third filtering cavity A3, the sixth filtering cavity a6 and the first filtering cavity a1 of the first filtering branch 121, and the second filtering cavity a2 of the first filtering branch 121 is further disposed adjacent to the third filtering cavity A3 and the first filtering cavity a1 of the first filtering branch 121. Such an adjacent arrangement can further reduce the size of the filter 10, which is advantageous for downsizing the filter 10.

The size of the first filter cavity a1 of the first filter branch 121, the size of the second filter cavity a2 of the first filter branch 121, the size of the third filter cavity A3 of the first filter branch 121, the size of the fourth filter cavity a4 of the first filter branch 121, the size of the fifth filter cavity a5 of the first filter branch 121, and the size of the sixth filter cavity a6 of the first filter branch 121 may be the same, so as to facilitate layout and debugging, and improve the consistency of the filter 10.

Referring again to fig. 1 and 2, the first filter cavity a1 of the first filter branch 121 and the third filter cavity A3 of the first filter branch 121 are capacitively cross-coupled, and the third filter cavity A3 of the first filter branch 121 and the fifth filter cavity a5 of the first filter branch 121 are capacitively cross-coupled to form two capacitive cross-coupling zeros of the first filter branch 121. Typically, the capacitive cross-coupling element may be a flying bar, for example, a flying bar is disposed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 121. The filter 10 of the present application can realize zero suppression, facilitating the debugging of the index. And the types of the cross-coupling zero points of the embodiment are the same, so that the product complexity can be reduced, and the stability of the filter 10 can be improved.

Optionally, 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 121 is connected to the first port, and the sixth filter cavity a6 of the first filter branch 121 is connected to the second port. Wherein the first port and the second port may both be taps of the filter 10.

In a specific embodiment, the bandwidth of the first filtering branch 121 lies in the range 2349MHz-2391 MHz. Specifically, the coupling bandwidth between the first port and the first filtering cavity a1 of the first filtering branch 121 is in the range of 34MHz-42 MHz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 121 is in the range of 25MHz-32 MHz; the coupling bandwidth between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 121 is in the range of (-16) MHz- (-11) MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 of the first filter branch 121 is in the range of 17MHz-23 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 121 is in the range of 15MHz-21 MHz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 121 is in the range of (-15) MHz- (-10) MHz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 121 is in the range of 16MHz-23 MHz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 of the first filter branch 121 ranges from 28MHz to 35 MHz; the coupling bandwidth between the sixth filter cavity a6 of the first filter branch 121 and the second port is in the range of 38MHz-42 MHz. Therefore, the bandwidth of the filter 10 of the present embodiment is in the range of 2349MHz-2391MHz, and can meet the design requirements.

The resonant frequencies of the first filter cavity a1 through the sixth filter cavity a6 of the first filter branch 121 are sequentially in the following ranges: 2370MHz-2372MHz, 2359MHz-2361MHz, 2371MHz-2373MHz, 2358MHz-2360MHz, 2370MHz-2372MHz, 2370MHz-2372 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. 3, fig. 3 is a diagram illustrating simulation results of the filter 10 in fig. 1. Experimentally, the bandwidth of the filter 10 of the present application lies in the range 2349MHz-2391MHz, as shown by the band curve 20 in fig. 3. Wherein the bandwidth suppression satisfies:

the two capacitive cross-coupling zeros of the first filtering branch 121 are respectively zero a and zero B, where the frequency of the zero B is 2345MHz, and the bandwidth rejection is greater than 52dB at this time, so that the out-of-band rejection performance of the filter 10 can be improved.

Different from the situation in the prior art, the first filtering branch 121 of the filter 10 of this embodiment is composed of six filtering cavities 122 coupled in sequence, and the six filtering cavities 122 of the first filtering branch 121 further form two capacitive cross-coupling zeros, so that zero suppression can be realized, and the index can be conveniently debugged; the types of the cross coupling zero points are the same, so that the material types can be reduced, the product complexity is reduced, and the stability of the filter 10 is improved. In addition, in the present application, the first filtering cavity a1 to the sixth filtering cavity a6 in the first filtering branch 121 are divided into two rows arranged along the second direction D, and the filtering cavities are regularly arranged, so that the space of the cavities can be fully utilized, which is beneficial to the miniaturization of the filter 10; in addition, the filter 10 of the present embodiment can produce a plurality of filters 10 by the same mold, which improves the production efficiency, reduces the cost, and has high stability.

The present application provides a filter of the second embodiment, which is described on the basis of the filter 10 disclosed in the first embodiment. As shown in fig. 4, the filter 10 of the present embodiment further includes: and the second filtering branch 123, the structure of the second filtering branch 123 is the same as that of the first filtering branch 121. The filter 10 of the embodiment has two identical row cavities, so that the space of the cavities can be fully utilized, and the debugging and the production cost reduction are facilitated.

The second filtering branch 123 is composed of six filtering cavities 124 coupled in sequence, and the six filtering cavities 124 in the second filtering branch 123 further form two capacitive cross-coupling zeros of the second filtering branch 123, so that zero suppression can be realized, and debugging of indexes is facilitated.

The six filter cavities 124 of the second filter branch 123 are specifically the first filter cavity B1 through the sixth filter cavity B6 of the second filter branch 123. The sixth filtering cavity B6, the fourth filtering cavity B4 and the first filtering cavity B1 of the second filtering branch 123 are in one row and are sequentially arranged along the first direction L; the fifth filter cavity B5, the third filter cavity B3 and the second filter cavity B2 of the second filter branch 123 are in a row and are sequentially arranged along the first direction L. The filter 10 is provided with the cavities in the regular arrangement mode, the size of the cavities can be reduced, the cost is saved, and the material consistency is good.

The fourth filtering cavity B4 of the second filtering branch 123 is further disposed adjacent to the fifth filtering cavity B5, the third filtering cavity B3, the sixth filtering cavity B6 and the first filtering cavity B1 of the second filtering branch 123, and the second filtering cavity B2 of the second filtering branch 123 is further disposed adjacent to the third filtering cavity B3 and the first filtering cavity B1 of the second filtering branch 123. By such a way of adjacent arrangement, the arrangement of the cavities can be more compact, the size of the filter 10 can be further reduced, and the miniaturization of the filter 10 is facilitated.

As shown in fig. 4 and 5, the first filter cavity B1 of the second filter branch 123 is capacitively cross-coupled with the third filter cavity B3 of the second filter branch 123, and the third filter cavity B3 of the second filter branch 123 is capacitively cross-coupled with the fifth filter cavity B5 of the second filter branch 123 to form two capacitive cross-coupling zeros of the second filter branch 123. The filter 10 of the present application can realize zero suppression, facilitating the debugging of the index. And the types of the cross-coupling zero points of the embodiment are the same, so that the product complexity can be reduced, and the stability of the filter 10 can be improved.

In this embodiment, the sizes of the first filter cavity a1 to the sixth filter cavity a6 of the first filter branch 121 and the sizes of the first filter cavity B1 to the sixth filter cavity B6 of the second filter branch 123 may be the same, so as to facilitate layout and debugging and improve the uniformity of the filter 10.

Optionally, a third port (not shown) and a fourth port (not shown) are further disposed on the housing 11, the first filter cavity B1 of the second filter branch 123 is connected to the third port, and the sixth filter cavity B6 of the second filter branch 123 is connected to the fourth port. Wherein, the third port and the fourth port can be taps of the filter 10.

In a specific embodiment, the bandwidth of the second filtering branch 123 is in the range of 2349MHz-2391 MHz. Since the structure of the second filtering branch 123 is the same as that of the first filtering branch 121, the debugging index parameter of the second filtering branch 123 may be the same as that of the first filtering branch 121, and is not described herein again. The simulation result of the second filtering branch 123 is the same as the frequency band curve 20 shown in fig. 3, and is not described herein again.

The filter 10 of this embodiment is provided with two filtering branches with the same structure, and the first filtering branch 121 and the second filtering branch 123 are arranged at intervals along the second direction D, so that the space of the filter 10 can be fully utilized, the production is convenient, and the production cost is reduced. The first filtering branch 121 and the second filtering branch 123 have the same structure and are regular in cavity arrangement, so that a plurality of filters 10 can be produced by the same die, the cost is reduced, and the stability is improved. In addition, the types of the cross-coupling zero points of the first filtering branch 121 and the second filtering branch 123 are the same, so that the material types can be reduced, the product complexity can be reduced, and the stability of the filter 10 can be improved.

The present application provides a filter of a third embodiment, which is described on the basis of the filter 10 disclosed in the second embodiment. As shown in fig. 6, the filter 10 of the present embodiment further includes a third filtering branch 125, the first filtering branch 121, the second filtering branch 123 and the third filtering branch 125 are disposed at intervals along the second direction D, and the second filtering branch 123 and the third filtering branch 125 are symmetrically disposed along the second direction D. The cavity is arranged regularly to each filtering branch of this embodiment, can make full use of the space of cavity, and is convenient for debug and reduction in production cost.

Specifically, the third filter branch 125 is composed of six filter cavities 126 coupled in sequence, and the six filter cavities 126 in the third filter branch 125 further form two capacitive cross-coupling zeros. Zero point suppression can be realized, and the debugging index is convenient.

The six filter cavities 126 of the third filter branch 125 are specifically a first filter cavity C1, a second filter cavity C2, a third filter cavity C3, a fourth filter cavity C4, a fifth filter cavity C5 and a sixth filter cavity C6 of the third filter branch 125. The six filter cavities 126 of the third filter branch 125 are divided into two rows arranged along the second direction D, and the fifth filter cavity C5, the third filter cavity C3 and the second filter cavity C2 of the third filter branch 125 are one row and sequentially arranged along the first direction L; the sixth filter cavity C6, the fourth filter cavity C4 and the first filter cavity C1 of the third filter branch 125 are in a row and are sequentially arranged along the first direction L. The filter 10 is provided with the cavities in the regular arrangement mode, the size of the cavities can be reduced, the cost is saved, and the material consistency is good.

The fourth filtering cavity C4 of the third filtering branch 125 is further disposed adjacent to the third filtering cavity C3, the fifth filtering cavity C5, the sixth filtering cavity C6 and the first filtering cavity C1 of the third filtering branch 125, respectively, and the second filtering cavity C2 of the third filtering branch 125 is further disposed adjacent to the first filtering cavity C1 and the third filtering cavity C3 of the third filtering branch 125, respectively. By this way, the arrangement of the cavities can be more compact, the size of the filter 10 can be further reduced, and the miniaturization of the filter 10 is facilitated.

As shown in fig. 6 and 7, the first filter cavity C1 of the third filter branch 125 and the third filter cavity C3 of the third filter branch 125, and the third filter cavity C3 of the third filter branch 125 and the fifth filter cavity C5 of the third filter branch 125 are capacitively cross-coupled to form two capacitive cross-coupling zeros of the third filter branch 125, respectively. The filter 10 of the present application can realize zero suppression, facilitating the debugging of the index. And the types of the cross-coupling zero points of the embodiment are the same, so that the product complexity can be reduced, and the stability of the filter 10 can be improved.

In this embodiment, the sizes of the first filtering cavity a1 to the sixth filtering cavity a6 of the first filtering branch 121, the sizes of the first filtering cavity B1 to the sixth filtering cavity B6 of the second filtering branch 123, and the sizes of the first filtering cavity C1 to the sixth filtering cavity C6 of the third filtering branch 125 may be the same, so as to facilitate layout and debugging, and improve the consistency of the filter 10.

Optionally, a fifth port (not shown) and a sixth port (not shown) are further disposed on the housing 11, the first filter cavity C1 of the third filter branch 125 is connected to the fifth port, and the sixth filter cavity C6 of the third filter branch 125 is connected to the sixth port. Wherein the fifth port and the sixth port can both be taps of the filter 10.

In a specific embodiment, the bandwidth of the third filtering branch 125 lies in the range 2349MHz-2391 MHz. The tuning index parameter of the third filtering branch 125 may be the same as the tuning index parameter of the first filtering branch 121, and is not described herein again. The simulation result of the third filtering branch 125 is the same as the frequency band curve 20 shown in fig. 3, and is not described herein again.

The filter 10 of this embodiment is provided with three routes of filtering branches, and first filtering branch 121, second filtering branch 123 and third filtering branch 125 are arranged along second direction D interval in proper order, can make full use of the space of filter 10, and convenient production, reduction in production cost. The filter cavities of the three filtering branches of the embodiment are arranged regularly, so that a plurality of filters 10 can be produced by the same die, the cost is reduced, and the stability is improved. In addition, the types of the cross-coupling zero points of the first filtering branch 121, the second filtering branch 123 and the third filtering branch 125 are the same, so that the material types can be reduced, the product complexity can be reduced, and the stability of the filter 10 can be improved.

The present application provides a filter of a fourth embodiment, which is described on the basis of the filter 10 disclosed in the third embodiment. As shown in fig. 8, the filter 10 of this embodiment further includes a fourth filtering branch 127, the first filtering branch 121, the second filtering branch 123, the third filtering branch 125 and the fourth filtering branch 127 are sequentially disposed at intervals along the second direction D, the fourth filtering branch 127 and the third filtering branch 125 are symmetrically disposed along the second direction D, and the structure of the fourth filtering branch 127 is the same as that of the first filtering branch 121.

The fourth filtering branch 127 is composed of six filtering cavities 128 coupled in sequence, and the six filtering cavities 128 in the fourth filtering branch 127 further form two capacitive cross-coupling zeros of the fourth filtering branch 127. Zero point suppression can be realized, and the debugging index is convenient.

Specifically, the six filter cavities 128 in the fourth filter branch 127 are divided into two rows arranged along the second direction D, and the sixth filter cavity D6, the fourth filter cavity D4 and the first filter cavity D1 of the fourth filter branch 127 are in one row and are sequentially arranged along the first direction L; the fifth filter cavity D5, the third filter cavity D3 and the second filter cavity D2 of the fourth filter branch 127 are in a row and are sequentially arranged along the first direction L. The filter 10 of the present application has regularly arranged cavities, which reduces the size of the filter 10.

The fourth filtering cavity D4 of the fourth filtering branch 127 is further disposed adjacent to the third filtering cavity D3, the fifth filtering cavity D5, the sixth filtering cavity D6 and the first filtering cavity D1 of the fourth filtering branch 127, respectively, and the second filtering cavity D2 of the fourth filtering branch 127 is further disposed adjacent to the first filtering cavity D1 and the third filtering cavity D3 of the fourth filtering branch 127, respectively. By such a way of adjacent arrangement, the arrangement of the cavities can be more compact, the size of the filter 10 can be further reduced, and the miniaturization of the filter 10 is facilitated.

As shown in fig. 8 and 9, the first filter cavity D1 of the fourth filter branch 127 and the third filter cavity D3 of the fourth filter branch 127, and the third filter cavity D3 of the fourth filter branch 127 and the fifth filter cavity D5 of the fourth filter branch 127 are capacitively cross-coupled to form two capacitive cross-coupling zeros of the fourth filter branch 127, respectively. The filter 10 of the present application can realize zero suppression, facilitating the debugging of the index. And the types of the cross-coupling zero points of the embodiment are the same, so that the product complexity can be reduced, and the stability of the filter 10 can be improved.

In this embodiment, the sizes of the first filtering cavity a1 to the sixth filtering cavity a6 of the first filtering branch 121, the sizes of the first filtering cavity B1 to the sixth filtering cavity B6 of the second filtering branch 123, the sizes of the first filtering cavity C1 to the sixth filtering cavity C6 of the third filtering branch 125, and the sizes of the first filtering cavity D1 to the sixth filtering cavity D6 of the fourth filtering branch 127 may be the same, so as to facilitate layout and debugging, and improve the consistency of the filter 10.

Optionally, a seventh port (not shown) and an eighth port (not shown) are further disposed on the housing 11, the seventh port is connected to the first filter cavity D1 of the fourth filter branch 127, and the eighth port is connected to the sixth filter cavity D6 of the fourth filter branch 127. Wherein, the seventh port and the eighth port can both be taps of the filter 10.

In a specific embodiment, the bandwidth of the fourth filtering branch 127 is in the range of 2349MHz-2391 MHz. Since the structure of the fourth filtering branch 127 is the same as that of the first filtering branch 121, the debugging index parameter of the fourth filtering branch 127 may be the same as that of the first filtering branch 121, and is not described herein again. The simulation result of the fourth filtering branch 127 is the same as the frequency band curve 20 shown in fig. 3, and is not described herein again.

The filter 10 of this embodiment is provided with four filtering branches, and the first filtering branch 121, the second filtering branch 123, the third filtering branch 125 and the fourth filtering branch 127 are arranged at intervals in sequence along the second direction D, make full use of the space of the filter 10, and are convenient for production, and production cost is reduced. The filter cavities of the four filter branches of the embodiment are arranged regularly, so that a plurality of filters 10 can be produced by the same die, the cost is reduced, and the stability is improved. In addition, the cross-coupling zeros in this embodiment are of the same type, which reduces the material types, reduces the product complexity, and improves the stability of the filter 10.

The present application further provides a communication device, as shown in fig. 10, fig. 10 is a schematic structural diagram of an embodiment of the communication device provided in 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 radio frequency unit 61 comprises the filter disclosed in the above embodiments for filtering the radio frequency signal.

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

The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to 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 six filtering cavities which are sequentially coupled, two capacitive cross-coupling zero points of the first filtering branch are formed, and the first filtering cavity to the sixth filtering cavity in the first filtering branch are divided into two rows arranged along the second direction.

2. The filter of claim 1,

the sixth filtering cavity, the fourth filtering cavity and the first filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction;

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

and the fourth filter cavity of the first filter branch is further arranged adjacent to the fifth filter cavity, the third filter cavity, the sixth filter cavity and the first filter cavity of the first filter branch, and the second filter cavity of the first filter branch is further arranged adjacent to the third filter cavity and the first filter cavity of the first filter branch.

3. The filter according to claim 2, wherein the first filter cavity and the third filter cavity of the first filter branch are capacitively cross-coupled, and the third filter cavity and the fifth filter cavity of the first filter branch are capacitively cross-coupled to form two capacitively cross-coupled zeros of the first filter branch, and a bandwidth of the first filter branch is in a range of: 2349MHz-2391 MHz.

4. The filter according to claim 2, further comprising a second filtering branch having the same structure as the first filtering branch, wherein the second filtering branch is composed of six sequentially coupled filtering cavities, and the six filtering cavities in the second filtering branch further form two capacitive cross-coupling zeros of the second filtering branch.

5. The filter according to claim 4, characterized in that the six filter cavities in the second filter branch are divided into two columns arranged in the second direction, wherein,

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

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

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

and the first filter cavity of the second filter branch circuit is capacitively and cross-coupled with the third filter cavity of the second filter branch circuit, and the third filter cavity of the second filter branch circuit is capacitively and cross-coupled with the fifth filter cavity of the second filter branch circuit, so that two capacitive cross-coupling zero points of the second filter branch circuit are formed.

6. The filter according to claim 5, further comprising a third filtering branch, wherein the first filtering branch, the second filtering branch and the third filtering branch are disposed at intervals along the second direction, and the third filtering branch is disposed symmetrically to the second filtering branch, the third filtering branch is composed of six filtering cavities coupled in sequence, and the six filtering cavities in the third filtering branch further form two capacitive cross-coupling zeros of the third filtering branch.

7. The filter according to claim 6, characterized in that the first through sixth filter cavities of the third filter branch are divided into two columns arranged in the second direction,

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

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

the fourth filter cavity of the third filter branch is further respectively and adjacently arranged with the third filter cavity, the fifth filter cavity, the sixth filter cavity and the first filter cavity of the third filter branch, and the second filter cavity of the third filter branch is further respectively and adjacently arranged with the first filter cavity and the third filter cavity of the third filter branch;

and the first filter cavity and the third filter cavity of the third filter branch circuit are in capacitive cross coupling, and the third filter cavity and the fifth filter cavity of the third filter branch circuit are in capacitive cross coupling, so that two capacitive cross coupling zeros of the third filter branch circuit are formed.

8. The filter according to claim 6, further comprising a fourth filtering branch, wherein the first filtering branch, the second filtering branch, the third filtering branch and the fourth filtering branch are disposed at intervals along the second direction, the structure of the fourth filtering branch is the same as that of the first filtering branch, the fourth filtering branch is composed of six filtering cavities coupled in sequence, and the six filtering cavities of the fourth filtering branch further form two capacitive cross-coupling zeros of the fourth filtering branch.

9. The filter according to claim 8, wherein the first through sixth filter cavities of the fourth filter branch are divided into two columns arranged in the second direction,

the sixth filtering cavity, the fourth filtering cavity and the first filtering cavity of the fourth filtering branch are in a row and are sequentially arranged along the first direction;

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

the fourth filter cavity of the fourth filter branch is further respectively and adjacently arranged with the third filter cavity, the fifth filter cavity, the sixth filter cavity and the first filter cavity of the fourth filter branch, and the second filter cavity of the fourth filter branch is further respectively and adjacently arranged with the first filter cavity and the third filter cavity of the fourth filter branch;

and the first filter cavity and the third filter cavity of the fourth filter branch circuit are in capacitive cross coupling, and the third filter cavity and the fifth filter cavity of the fourth filter branch circuit are in capacitive cross coupling, so that two capacitive cross coupling zeros of the fourth filter branch circuit are formed.

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.