CN113054371A

CN113054371A - Communication device and filter thereof

Info

Publication number: CN113054371A
Application number: CN201911383503.0A
Authority: CN
Inventors: 周峰; 钟志波; 李华; 刘学鑫
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 port is arranged on the shell; the first filtering branch is connected with the first port and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch further form a cross-coupling zero point; and the second filtering branch circuit is connected with the first port and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the second filtering branch circuit further form a cross coupling zero point. By the mode, the two filtering branches are connected with the first port, so that the number of taps can be reduced, and the size of the filter is reduced; the isolation between the two filtering branches is high, 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 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 this application discovers in long-term research and development work, for reducing the volume of wave filter, the wave filter is provided with the filtering branch road of two sets of or more than two sets of different frequencies usually, but every filtering branch road that has now all need independently be provided with the tap, the quantity of taking a tap is too much, it is also more to lead to required welding point, be unfavorable for reducing the volume of wave filter, influence the stability of wave filter, the performance such as outband suppression of current wave filter is relatively poor moreover, accomplish the high isolation between the filtering branch road of different frequencies very difficultly.

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, where the filter includes:

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

a first port disposed on the housing;

the first filtering branch is connected with the first port and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch further form a cross-coupling zero point;

and the second filtering branch circuit is connected with the first port and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the second filtering branch circuit further form a cross coupling zero point.

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 filter as described above and is configured to filter a radio frequency signal.

Compared with the prior art, the filter of this application includes: a housing having a first direction and a second direction perpendicular to each other; the first port is arranged on the shell; the first filtering branch is connected with the first port and consists of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the first filtering branch further form a cross-coupling zero point; and the second filtering branch circuit is connected with the first port and consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the second filtering branch circuit further form a cross coupling zero point. Through the mode, the two filtering branches are connected with the first port, so that the number of taps can be reduced, welding points can be reduced, and the size of the filter can be reduced; the first filtering branch and the second filtering branch are provided with cross coupling zero points, zero point suppression can be achieved, isolation between the two filtering branches is high, product complexity can be reduced, and stability of the filter is improved.

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 an embodiment of a filter provided herein;

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 topology of a second filtering branch provided in the present application;

FIG. 4 is a schematic diagram of another embodiment of a filter provided herein;

fig. 5 is a schematic diagram of a topology of a third filtering branch provided in the present application;

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

FIG. 7 is a schematic diagram of a filter according to another embodiment of the present application;

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

fig. 9 is a schematic diagram of a topology of a sixth filtering branch provided in the present application;

FIG. 10 is a diagram illustrating simulation results of another embodiment of the filter provided herein;

FIG. 11 is a diagram illustrating simulation results of another embodiment of the filter provided in the present application

Fig. 12 is a schematic structural diagram of an embodiment of a communication device provided in 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 system 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 system.

The present application provides a filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes a housing 11, a first port 12, a first filtering branch 13 and a second filtering branch 14; the first filtering branch 13 and the second filtering branch 14 may be a receiving filtering branch and a transmitting filtering branch, respectively, or may be both a receiving filtering branch and a transmitting filtering branch. The first port 12 is disposed on the housing 11, wherein 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 13 is connected to the first port 12 and is composed of seven filtering cavities coupled in sequence, and the seven filtering cavities of the first filtering branch 13 further form a cross-coupling zero 131.

The second filtering branch 14 is connected to the first port 12 and is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the second filtering branch 14 further form a cross-coupling zero 141.

In this embodiment, the first filtering branch 13 and the second filtering branch 14 are connected to the first port 12 to implement signal transceiving, and the number of taps can be reduced by setting the first port 12, so as to reduce the number of welding points, thereby reducing the size of the filter 10 and improving the out-of-band rejection performance of the filter 10.

Wherein, the seven filter cavities of the first filter branch 13 are divided into four columns arranged along the first direction L; the first filtering cavity a1 and the second filtering cavity a2 of the first filtering branch 13 are in a row and are sequentially arranged along the second direction D; the fourth filtering cavity a4 and the third filtering cavity A3 of the first filtering branch 13 are in a row and are sequentially arranged along the second direction D; the fifth filtering cavities a5 of the first filtering branch 13 are in one row; the sixth filter cavity a6 and the seventh filter cavity a7 of the first filter branch 13 are in a row and are sequentially arranged along the second direction D.

Further, the fifth filter cavity a5 of the first filter branch 13 is respectively disposed adjacent to the third filter cavity A3, the fourth filter cavity a4 and the sixth filter cavity A6, and the fifth filter cavity a5 to the seventh filter cavity a7 of the first filter branch 13 are disposed in a triangle, a projection of a center of the sixth filter cavity A6 in the first direction L is located between a projection of a center of the fifth filter cavity a5 and a projection of a center of the seventh filter cavity a7 in the first direction L, and a projection of a center of the fifth filter cavity a5 in the second direction D is located between a projection of a center of the sixth filter cavity A6 and a projection of a center of the seventh filter cavity a7 in the second direction D; the first filtering cavity a1 of the first filtering branch 13 is respectively adjacent to the second filtering cavity a2, the third filtering cavity A3 and the fourth filtering cavity a 4; the first filter chamber a1 of the first filter branch 13 is further connected to the first port 12.

The seven filter cavities of the first filter branch 13 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Furthermore, the seven filter cavities of the first filter branch 13 have the same size, so that the seven filter cavities of the first filter branch 13 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have the same distance and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

The first filtering cavity B1 and the second filtering cavity B2 of the second filtering branch 14 are in a row and are sequentially arranged along the second direction D; the first filtering cavity B1, the fourth filtering cavity B4 and the fifth filtering cavity B5 of the second filtering branch 14 are in a row and are sequentially arranged along the first direction L; the third filter cavity B3 of the second filter branch 14 is respectively adjacent to the first filter cavity B1, the second filter cavity B2 and the fourth filter cavity B4; the first filter chamber B1 of the second filter branch 14 is further connected to the first port 12.

The five filter cavities of the second filter branch 14 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, the sizes of the five filter cavities of the second filter branch 14 are the same, so that the five filter cavities of the second filter branch 14 in the housing 11 can be distributed at equal intervals, the distances between the centers of any two adjacent filter cavities are equal, the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved.

Further, as shown in fig. 2, the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 13 are capacitively cross-coupled to form a capacitive cross-coupled zero of the first filter branch 13, such as the capacitor C1 shown in fig. 2. The capacitive cross-coupling zero of the first filtering branch 13 can be set to realize zero suppression, so that the debugging indexes are facilitated, and the design requirements are met.

Specifically, a window may be disposed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 13, and a capacitive fly rod may be disposed at the window, so as to implement capacitive cross coupling between the first filter cavity a1 and the third filter cavity A3, forming a capacitive cross coupling zero, which is equivalent to the capacitor C1 shown in fig. 2.

As shown in fig. 3, the first filter cavity B1 of the second filter branch 14 is inductively cross-coupled with the third filter cavity B3 to form a cross-coupled zero 141 of the second filter branch 14, such as the inductor L1 shown in fig. 3. The zero point suppression can be realized by setting the cross-coupling zero point 141 of the second filtering branch 14, so that the debugging index is facilitated, and the design requirement is met.

Specifically, a window may be disposed between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the first filter cavity B1 and the third filter cavity B3, and an inductive cross coupling zero is formed, which is equivalent to the inductance L1 shown in fig. 3. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy cannot pass through the network at the frequency point corresponding to the transmission zero, so that the complete isolation effect is achieved, the inhibition effect on signals outside the band-pass is achieved, and the high isolation among a plurality of band-passes can be better achieved.

In this embodiment, the first filtering branch 13 and the second filtering branch 14 are connected to the first port 12 to implement signal transceiving, and the number of taps can be reduced by setting the first port 12, so as to reduce the number of welding points, further reduce the size of the filter 10 and improve the out-of-band rejection performance of the filter 10; seven filter cavities of the first filter branch 13 and five filter cavities of the second filter branch 14 are regularly arranged, so that the space in the shell 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved; furthermore, the seven filter cavities of the first filter branch 13 and the five filter cavities of the second filter branch 14 have the same size, so that the seven filter cavities of the first filter branch 13 and the five filter cavities of the second filter branch 14 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have the same distance and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10; the setting of the cross-coupling zero point 141 of the second filtering branch 14 and the setting of the cross-coupling zero point 131 of the first filtering branch 13 can realize zero point suppression, thereby facilitating debugging indexes and meeting design requirements.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the filter of the present application. The filter 10 of the present embodiment further includes a second port 15, a third filtering branch 16 and a fourth filtering branch 17 on the basis of the embodiment shown in fig. 1.

The second port 15 is spaced apart from the first port 12 and disposed on the housing 11.

And a third filtering branch 16 connected to the second port 15 and disposed adjacent to the first filtering branch 13, wherein the third filtering branch 16 is composed of seven sequentially coupled filtering cavities, and the seven filtering cavities of the third filtering branch further form a cross-coupling zero point 161.

And a fourth filtering branch 17 connected to the second port 15 and disposed adjacent to the second filtering branch 14, wherein the fourth filtering branch 17 is composed of five filtering cavities coupled in sequence, and the five filtering cavities of the fourth filtering branch 17 further form a cross-coupling zero 171.

In this embodiment, the third filtering branch 16 and the fourth filtering branch 17 are connected to the second port 15 to implement the transceiving of signals, and the number of taps can be reduced by setting the second port 15, so as to reduce the number of welding points, and further reduce the size of the filter 10 and improve the out-of-band rejection performance of the filter 10.

In this embodiment, the first filtering branch 13 and the third filtering branch 16 may be transmitting filtering branches, and the second filtering branch 14 and the fourth filtering branch 17 may be receiving filtering branches.

Wherein, the seven filter cavities of the first filter branch 13 and the seven filter cavities of the third filter branch 16 are divided into four rows arranged along the first direction L; the first filter cavity a1 of the first filter branch 13, the second filter cavity a2 and the first filter cavity C1 of the third filter branch 16 are in a row and are sequentially arranged along the second direction D; the fourth filtering cavity a4, the third filtering cavity A3, the third filtering cavity C3 and the second filtering cavity C2 of the first filtering branch 13, the third filtering cavity C3, the third filtering cavity C3 and the second filtering cavity C2 are in a row and are sequentially arranged along the second direction D; the fifth filter cavity a5 of the first filter branch 13, the fourth filter cavity C4 of the third filter branch 16 and the fifth filter cavity C5 are in a row and are sequentially arranged along the second direction D; the sixth filtering cavity a6, the seventh filtering cavity a7 of the first filtering branch 13, the seventh filtering cavity C7 and the sixth filtering cavity C6 of the third filtering branch 16 are in a row and are sequentially arranged along the second direction D.

Further, the sixth filter cavity C6 of the third filter branch 16 is respectively disposed adjacent to the seventh filter cavity C7 and the fifth filter cavity C5; the fourth filtering cavity C4 of the third filtering branch 16 is respectively adjacent to the seventh filtering cavity C7, the fifth filtering cavity C5, the third filtering cavity C3, the seventh filtering cavity a7 of the first filtering branch 13, the fifth filtering cavity a5 and the third filtering cavity A3; the third filtering cavity C3 of the third filtering branch 16 is respectively adjacent to the fourth filtering cavity C4, the fifth filtering cavity C5, the second filtering cavity C2, the first filtering cavity C1, the second filtering cavity a2 of the first filtering branch 13 and the third filtering cavity A3; the first filter chamber C1 of the third filter branch 16 is further connected to the second port 15.

The seven filter cavities of the third filter branch 16 and the seven filter cavities of the first filter branch 13 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, the seven filter cavities of the third filter branch 16 and the seven filter cavities of the first filter branch 13 have the same size, so that the seven filter cavities of the third filter branch 16 and the seven filter cavities of the first filter branch 13 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have the same distance and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

Five filter cavities of the second filter branch 14 and five filter cavities of the fourth filter branch 17 are divided into four rows arranged along the first direction L; the fourth filtering cavity B4 of the second filtering branch 14, the fifth filtering cavity D5 of the fourth filtering branch 17 and the fourth filtering cavity D4 are in a row and are sequentially arranged along the second direction D; the third filtering cavity B3 of the second filtering branch 14, the third filtering cavity D3 of the fourth filtering branch 17 and the second filtering cavity D2 are in a row and are sequentially arranged along the second direction D; the first filter cavity B1 of the second filter branch 14, the second filter cavity B2 and the first filter cavity D1 of the fourth filter branch 17 are in a row and are arranged in sequence along the second direction D.

Further, the first filter cavity D1 of the fourth filter branch 17 is respectively disposed adjacent to the second filter cavity D2, the third filter cavity D3 and the second filter cavity B2 of the second filter branch 14; the third filtering cavity D3 of the fourth filtering branch 17 is respectively adjacent to the first filtering cavity D1, the second filtering cavity D2, the fourth filtering cavity D4, the fifth filtering cavity D5, the second filtering cavity B2 of the second filtering branch 14 and the third filtering cavity B3; the fifth filter cavity D5 of the fourth filter branch 17 is further arranged adjacent to the fourth filter cavity B4 of the second filter branch 14; the first filter chamber D1 of the fourth filter branch 17 is further connected to the second port 15.

The five filter cavities of the fourth filter branch 17 and the five filter cavities of the second filter branch 14 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, the five filter cavities of the fourth filter branch 17 and the five filter cavities of the second filter branch 14 have the same size, so that the five filter cavities of the fourth filter branch 17 and the five filter cavities of the second filter branch 14 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have equal distances and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

As shown in fig. 5, the third filter cavity C3 of the third filter branch 16 is capacitively cross-coupled with the fifth filter cavity C5 to form a capacitive cross-coupling zero of the third filter branch 16, such as the capacitor C1 shown in fig. 5. The zero point suppression can be realized by setting the cross-coupling zero point 161 of the third filtering branch 16, so that the debugging index is facilitated, and the design requirement is met.

Specifically, a window may be disposed between the third filtering cavity C3 and the fifth filtering cavity C5 of the third filtering branch 16, and a capacitive fly rod may be disposed at the window, so as to implement capacitive cross coupling between the third filtering cavity C3 and the fifth filtering cavity C5, forming a capacitive cross coupling zero, which is equivalent to the capacitor C1 shown in fig. 5.

As shown in fig. 6, the first filter cavity D1 of the fourth filter branch 17 is inductively cross-coupled with the third filter cavity D3 to form an inductive cross-coupling zero of the fourth filter branch 17, such as the inductor L1 shown in fig. 6. The zero point suppression can be realized by the arrangement of the cross-coupling zero point 171 of the fourth filtering branch 17, so that the debugging index is facilitated, and the design requirement is met.

Specifically, a window may be disposed between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 17, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the first filter cavity D1 and the third filter cavity D3, and an inductive cross coupling zero is formed, which is equivalent to the inductance L1 shown in fig. 6. In this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so as to prevent the filter 10 from generating the temperature drift.

In this embodiment, the third filtering branch 16 and the fourth filtering branch 17 are connected to the second port 15 to implement signal transceiving, and the number of taps can be reduced by setting the second port 15, so as to reduce the number of welding points, further reduce the size of the filter 10 and improve the out-of-band rejection performance of the filter 10; the seven filter cavities of the third filter branch 16 and the seven filter cavities of the first filter branch 13 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 is reduced, the stability of the filter 10 is improved, the seven filter cavities of the third filter branch 16 and the seven filter cavities of the first filter branch 13 are the same in size, the seven filter cavities of the third filter branch 16 and the seven filter cavities of the first filter branch 13 in the housing 11 can be equidistantly distributed, the distances between the centers of any two adjacent filter cavities are equal, the arrangement is tight, the layout and debugging are convenient, and the consistency of the filter 10 is improved; the five filter cavities of the fourth filter branch 17 and the five filter cavities of the second filter branch 14 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 is reduced, the stability of the filter 10 is improved, the five filter cavities of the fourth filter branch 17 and the five filter cavities of the second filter branch 14 are the same in size, the five filter cavities of the fourth filter branch 17 and the five filter cavities of the second filter branch 14 in the housing 11 can be equidistantly distributed, the distances between the centers of any two adjacent filter cavities are equal, the arrangement is tight, the layout and debugging are convenient, and the consistency of the filter 10 is improved; the setting of the cross-coupling zero point 161 of the third filtering branch 16 and the setting of the cross-coupling zero point 171 of the fourth filtering branch 17 can realize zero point suppression, thereby facilitating debugging indexes and meeting design requirements.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of the filter of the present application. The filter 10 of the present embodiment further includes a fifth filtering branch 18 and a sixth filtering branch 19 on the basis of the embodiment shown in fig. 4.

The fifth filtering branch 18 is adjacent to the third filtering branch 16 and is composed of ten filtering cavities coupled in sequence, and the ten filtering cavities of the fifth filtering branch 18 further form four cross-coupling zeros 181, so that zero suppression can be realized.

The sixth filtering branch 19 is disposed adjacent to the fourth filtering branch 17 and is composed of ten sequentially coupled filtering cavities, and the ten filtering cavities of the sixth filtering branch 19 further form four cross-coupling zeros 191, so that zero suppression can be realized.

In this embodiment, the first filtering branch 13 and the third filtering branch 16 may be transmitting filtering branches, and the second filtering branch 14 and the fourth filtering branch 17 may be receiving filtering branches; the fifth filtering branch 18 and the sixth filtering branch 19 may be a transmitting filtering branch or a receiving filtering branch.

Wherein the ten filter cavities of the fifth filter branch 18 are divided into three columns arranged along the second direction D; the fifth filter cavity E5 and the tenth filter cavity E10 of the fifth filter branch 18 are in a row and are sequentially arranged along the first direction L; the ninth filtering cavity E9, the sixth filtering cavity E6, the fourth filtering cavity E4 and the first filtering cavity E1 of the fifth filtering branch 18 are in a row and are sequentially arranged along the first direction L; the eighth filter cavity E8, the seventh filter cavity E7, the third filter cavity E3, and the second filter cavity E2 of the fifth filter branch 18 are arranged in a row and sequentially arranged along the first direction L.

Further, the second filter cavity E2 of the fifth filter branch 18 is respectively disposed adjacent to the first filter cavity E1, the third filter cavity E3 and the fourth filter cavity E4; the fifth filter cavity E5 of the fifth filter branch 18 is respectively adjacent to the fourth filter cavity E4, the sixth filter cavity E6, the second filter cavity C2 of the third filter branch 16, the fifth filter cavity C5 and the sixth filter cavity C6; the sixth filtering cavity E6 of the fifth filtering branch 18 is respectively adjacent to the third filtering cavity E3, the fourth filtering cavity E4, the fifth filtering cavity E5, the seventh filtering cavity E7 and the ninth filtering cavity E9; the tenth filter cavity E10 of the fifth filter branch 18 is disposed adjacent to the ninth filter cavity E9, the first filter cavity C1 of the third filter branch 16 and the second filter cavity C2, respectively.

The ten filter cavities of the fifth filter branch 18 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, ten filter cavities of the fifth filter branch 18 have the same size, so that the ten filter cavities of the fifth filter branch 18 in the housing 11 can be distributed at equal intervals, the distances between the centers of any two adjacent filter cavities are equal, the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved. Further, the ten filter cavity sizes of the fifth filter branch 18 are smaller than the eight filter cavity sizes of the third filter branch 16.

Wherein, ten filter cavities of the sixth filter branch 19 are divided into four columns arranged along the first direction L; the fourth filter cavity F4, the fifth filter cavity F5 and the seventh filter cavity F7 of the sixth filter branch 19 are in a row and are sequentially arranged along the second direction D; the third filter cavity F3, the sixth filter cavity F6 and the eighth filter cavity F8 of the sixth filter branch 19 are in a row and are sequentially arranged along the second direction D; the second filter cavity F2 and the ninth filter cavity F9 of the sixth filter branch 19 are in a row and are sequentially arranged along the second direction D; the first filter cavity F1 and the tenth filter cavity F10 of the sixth filter branch 19 are in a row and are sequentially arranged along the second direction D.

Further, the sixth filtering cavity F6 of the sixth filtering branch 19 is respectively adjacent to the second filtering cavity F2, the third filtering cavity F3, the fifth filtering cavity F5, the seventh filtering cavity F7, the eighth filtering cavity F8 and the ninth filtering cavity F9; the fourth filter cavity D4 of the fourth filter branch 17 is respectively adjacent to the third filter cavity F3 and the fourth filter cavity F4 of the sixth filter branch 19; the fifth filter cavity F5 of the sixth filter branch 19 is respectively adjacent to the third filter cavity F3, the fourth filter cavity F4, the sixth filter cavity F6 and the seventh filter cavity F7; the first filter cavity F1 of the sixth filter branch 19 is respectively adjacent to the tenth filter cavity F10 and the second filter cavity F2; the second filter cavity D2 of the fourth filter branch 17 is arranged adjacent to the third filter cavity F3 and the second filter cavity F2 of the sixth filter branch 19, respectively.

The ten filter cavities of the sixth filter branch 19 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, ten filter cavities of the sixth filter branch 19 are the same in size, so that the ten filter cavities of the sixth filter branch 19 in the housing 11 can be distributed at equal intervals, the distances between the centers of any two adjacent filter cavities are equal, the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved. Further, ten filter cavity sizes of the sixth filter branch 19 are smaller than eight filter cavity sizes of the fourth filter branch 17, and ten filter cavity sizes of the sixth filter branch 19 are equal to ten filter cavity sizes of the fifth filter branch 18.

As shown in fig. 8, the second filter cavity E2 and the fourth filter cavity E4, the fifth filter cavity E5 and the seventh filter cavity E7, and the fifth filter cavity E5 and the eighth filter cavity E8 of the fifth filter branch 18 are inductively cross-coupled, respectively, and the second filter cavity E2 and the fifth filter cavity E5 are capacitively cross-coupled to form four cross-coupled zeros 181 of the fifth filter branch 18, such as the inductances L1, L2, L3, and the capacitance C1 shown in fig. 8. The zero point suppression can be realized by the arrangement of the cross-coupling zero point 181 of the fifth filtering branch 18, so that the debugging index is facilitated, and the design requirement is met.

As shown in fig. 9, capacitive cross coupling exists between the third filter cavity F3 and the fifth filter cavity F5 of the sixth filter branch 19, inductive cross coupling exists between the third filter cavity F3 and the sixth filter cavity F6, between the sixth filter cavity F6 and the eighth filter cavity F8, and between the sixth filter cavity F6 and the ninth filter cavity F9, respectively, so as to form four cross-coupling zeros 191 of the sixth filter branch 19, such as the capacitors C1, the inductors L1, L2, and L3 shown in fig. 9. The zero point suppression can be realized by the arrangement of the cross-coupling zero point 191 of the sixth filtering branch 19, so that the debugging index is facilitated, and the design requirement is met.

Optionally, the housing 11 is further provided with a third port (not shown), a fourth port (not shown), a fifth port (not shown), a sixth port (not shown), a seventh port (not shown), an eighth port (not shown), a ninth port (not shown) and a tenth port (not shown).

The seventh filtering cavity a7 of the first filtering branch 13 is connected to the third port, the fifth filtering cavity B5 of the second filtering branch 14 is connected to the fourth port, and the seventh filtering cavity C7 of the third filtering branch 14 is connected to the fifth port; the fifth filtering cavity D5 of the fourth filtering branch 15 is connected to the sixth port, the first filtering cavity E1 of the fifth filtering branch 18 is connected to the seventh port, the tenth filtering cavity E10 of the fifth filtering branch 18 is connected to the eighth port, the first filtering cavity F1 of the sixth filtering branch 19 is connected to the ninth port, and the tenth filtering cavity F10 of the sixth filtering branch 19 is connected to the tenth port.

The first to tenth ports may be taps of the filter 10. The filter 10 is provided with a first port 12 and a second port 15, the first port 12 is connected to the first filtering cavity a1 of the first filtering branch 13 and the first filtering cavity B1 of the second filtering branch 14, the second port 15 is connected to the first filtering cavity C1 of the third filtering branch 16 and the first filtering cavity D1 of the fourth filtering branch 17, the size of the filter 10 can be reduced, the number of taps is reduced, and the welding point is reduced.

The bandwidth of the first filtering branch 13 of the present embodiment is in the range of 1804Mhz-1831 Mhz. In particular, the coupling bandwidth between the first port 12 and the first filter cavity a1 of the first filter branch 13 ranges from 25Mhz to 33 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 13 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 of the first filter branch 13 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 13 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 13 ranges from-6 Mhz to-1 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 13 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 of the first filter branch 13 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 of the first filter branch 13 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 13 and the third port is in the range of 25Mhz-33 Mhz.

The bandwidth of the second filtering branch 14 of this embodiment is in the range of 1709Mhz-1736 Mhz. In particular, the coupling bandwidth between the first port 12 and the first filter cavity B1 of the second filter branch 14 ranges from 25Mhz to 33 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 of the second filter branch 14 ranges from 19Mhz to 26 Mhz; the coupling bandwidth between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 14 ranges from 1Mhz to 6 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 of the second filter branch 14 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 of the second filter branch 14 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 of the second filter branch 14 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the fourth port of the second filter branch 14 is in the range of 13Mhz-19 Mhz.

Therefore, the resonant frequencies of the first filter cavity a1 through the seventh filter cavity a7 of the first filter branch 13 are sequentially located in the following ranges: 1816Mhz-1818Mhz, 1812Mhz-1814Mhz, 1816Mhz-1818 Mhz.

The sizes of the filter cavities of the first filter branch 13 are substantially the same, and the resonant frequencies of the filter cavities are substantially the same, wherein the first resonant frequency, the second resonant frequency, the third resonant frequency, the fifth resonant frequency, the sixth resonant frequency and the seventh resonant frequency are completely the same; the consistency can be improved, the modulation is convenient, namely the manufacturing can be carried out by adopting the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

The resonant frequencies of the second filter cavity B1 through the fifth filter cavity B5 of the second filter branch 14 are sequentially in the following ranges: 1721Mhz-1723Mhz, 1724Mhz-1726Mhz, 1720Mhz-1722Mhz, 1721Mhz-1723 Mhz.

The sizes of the filter cavities of the second filter branch 14 are substantially the same, and the resonant frequencies of the filter cavities are substantially the same, wherein the first resonant frequency, the fourth resonant frequency and the fifth resonant frequency are completely the same; the consistency can be improved, the modulation is convenient, namely the manufacturing can be carried out by adopting the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

The bandwidth of the third filtering branch 16 of this embodiment is in the range 1804Mhz-1831 Mhz. In particular, the coupling bandwidth between the second port 15 and the first filter cavity C1 of the third filter branch 16 ranges from 25Mhz to 33 Mhz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 of the third filter branch 16 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 of the third filter branch 16 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 of the third filter branch 16 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the third filter cavity C3 and the fifth filter cavity C5 of the third filter branch 16 ranges from-6 Mhz to-1 Mhz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 of the third filter branch 16 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the fifth filter cavity C5 and the sixth filter cavity C6 of the third filter branch 16 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the sixth filter cavity C6 and the seventh filter cavity C7 of the third filter branch 16 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the seventh filter cavity C7 and the fifth port of the third filter branch 16 is in the range of 25Mhz-33 Mhz.

The bandwidth of the fourth filtering branch 17 of this embodiment is in the range of 1709Mhz-1736 Mhz. In particular, the coupling bandwidth between the second port 15 and the first filter cavity D1 of the fourth filter branch 17 ranges from 25Mhz to 33 Mhz; the coupling bandwidth between the first filter cavity D1 and the second filter cavity D2 of the fourth filter branch 17 ranges from 19Mhz to 26 Mhz; the coupling bandwidth between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 17 ranges from 1Mhz to 6 Mhz; the coupling bandwidth between the second filter cavity D2 and the third filter cavity D3 of the fourth filter branch 17 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the third filter cavity D3 and the fourth filter cavity D4 of the fourth filter branch 17 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the fourth filter cavity D4 and the fifth filter cavity D5 of the fourth filter branch 17 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the fifth filter cavity D5 and the fourth port of the fourth filter branch 17 is in the range of 13Mhz-19 Mhz.

Therefore, the resonant frequencies of the first filter cavity C1 through the seventh filter cavity C7 of the third filter branch 16 are sequentially located in the following ranges: 1816Mhz-1818Mhz, 1812Mhz-1814Mhz, 1816Mhz-1818 Mhz.

The sizes of the filter cavities of the third filter branch 16 are substantially the same, and the resonant frequencies of the filter cavities are substantially the same, wherein the first resonant frequency, the second resonant frequency, the third resonant frequency, the fifth resonant frequency, the sixth resonant frequency and the seventh resonant frequency are completely the same; the consistency can be improved, the modulation is convenient, namely the manufacturing can be carried out by adopting the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

The resonant frequencies of the first filter cavity D1 through the fifth filter cavity D5 of the fourth filter branch 17 are sequentially in the following ranges: 1721Mhz-1723Mhz, 1724Mhz-1726Mhz, 1720Mhz-1722Mhz, 1721Mhz-1723 Mhz.

The sizes of the filter cavities of the fourth filter branch 17 are substantially the same, the resonant frequencies of the filter cavities are substantially the same, and the first resonant frequency, the fourth resonant frequency and the fifth resonant frequency are completely the same; the consistency can be improved, the modulation is convenient, namely the manufacturing can be carried out by adopting the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

The bandwidth of the fifth filtering branch 18 of the present embodiment is in the range of 2514Mhz-2676 Mhz. In particular, the coupling bandwidth between the seventh port and the first filter cavity E1 of the fifth filter branch 18 ranges from 158Mhz to 180 Mhz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 of the fifth filter branch 18 ranges from 123Mhz to 141 Mhz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 of the fifth filter branch 18 ranges from 49Mhz to 59 Mhz; the coupling bandwidth between the second filter cavity E2 and the fourth filter cavity E4 of the fifth filter branch 18 ranges from-75 Mhz to-63 Mhz; the coupling bandwidth between the second filter cavity E2 and the fifth filter cavity E5 of the fifth filter branch 18 ranges from 17Mhz to 24 Mhz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 of the fifth filter branch 18 ranges from 31Mhz to 39 Mhz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 of the fifth filter branch 18 ranges from 73Mhz to 86 Mhz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 of the fifth filter branch 18 ranges from 34Mhz to 42 Mhz; the coupling bandwidth between the fifth filter cavity E5 and the seventh filter cavity E7 of the fifth filter branch 18 ranges from 60Mhz to 71 Mhz; the coupling bandwidth between the fifth filter cavity E5 and the eighth filter cavity E8 of the fifth filter branch 18 ranges from 24Mhz to 31 Mhz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 of the fifth filter branch 18 ranges from 23Mhz to 30 Mhz; the coupling bandwidth between the seventh filter cavity E7 and the eighth filter cavity E8 of the fifth filter branch 18 ranges from 71Mhz to 84 Mhz; the coupling bandwidth between the eighth filter cavity E8 and the ninth filter cavity E9 of the fifth filter branch 18 ranges from 83Mhz to 97 Mhz; the coupling bandwidth between the ninth filter cavity E9 and the tenth filter cavity E10 of the fifth filter branch 18 ranges from 123Mhz-141 Mhz; the coupling bandwidth between the tenth filter cavity E10 and the eighth port of the fifth filter branch 18 is in the range of 158Mhz-180 Mhz.

The bandwidth of the sixth filtering branch 19 of the present embodiment is in the range of 2514Mhz-2676 Mhz. In particular, the coupling bandwidth between the ninth port and the first filter cavity F1 of the sixth filter branch 19 ranges from 151Mhz to 172 Mhz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 of the sixth filter branch 19 ranges from 121Mhz to 139 Mhz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 of the sixth filter branch 19 ranges from 84Mhz to 98 Mhz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 of the sixth filter branch 19 ranges from 39Mhz to 48 Mhz; the coupling bandwidth between the third filter cavity F3 and the fifth filter cavity F5 of the sixth filter branch 19 ranges from-73 Mhz to-61 Mhz; the coupling bandwidth between the third filter cavity F3 and the sixth filter cavity F6 of the sixth filter branch 19 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 of the sixth filter branch 19 ranges from 26Mhz to 34 Mhz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 of the sixth filter branch 19 ranges from 72Mhz to 85 Mhz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 of the sixth filter branch 19 ranges from 47Mhz to 57 Mhz; the coupling bandwidth between the sixth filter cavity F6 and the eighth filter cavity F8 of the sixth filter branch 19 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the sixth filter cavity F6 and the ninth filter cavity F9 of the sixth filter branch 19 ranges from 16Mhz to 22 Mhz; the coupling bandwidth between the seventh filter cavity F7 and the eighth filter cavity F8 of the sixth filter branch 19 ranges from 39Mhz to 48 Mhz; the coupling bandwidth between the eighth filter cavity F8 and the ninth filter cavity F9 of the sixth filter branch 19 ranges from 82Mhz to 96 Mhz; the coupling bandwidth between the ninth filter cavity F9 and the tenth filter cavity F10 of the sixth filter branch 19 ranges from 121Mhz to 139 Mhz; the coupling bandwidth between the tenth filter cavity F10 and the tenth port of the sixth filtering branch 19 ranges from 151Mhz to 172 Mhz.

Therefore, the resonant frequencies of the first filter cavity E1 through the tenth filter cavity E10 of the fifth filter branch 18 are sequentially located in the following ranges: 2592Mhz-2594Mhz, 2571Mhz-2573Mhz, 2522Mhz-2524Mhz, 2591Mhz-2593Mhz, 2605Mhz-2607Mhz, 2660Mhz-2662Mhz, 2592Mhz-2594 Mhz.

It can be seen that the resonant frequencies of the ten filter cavities of the fifth filter branch 18 are substantially the same, which improves the convenience of manufacturing and tuning the filter 10, i.e. the filter can be manufactured with the same specification parameters during the manufacturing process, and the required parameter range can be reached only by simple tuning during the actual process.

The resonant frequencies of the second filter cavity F1 through the tenth filter cavity F10 of the sixth filter branch 19 are sequentially in the following ranges: 2592Mhz-2594Mhz, 2521Mhz-2523Mhz, 2572Mhz-2574Mhz, 2591Mhz-2593Mhz, 2659Mhz-2661Mhz, 2607Mhz-2609Mhz, 2592Mhz-2594 Mhz.

It can be seen that the resonant frequencies of the ten filter cavities of the sixth filter branch 19 are substantially the same, which improves the convenience of manufacturing and debugging the filter 10, i.e. the filter can be manufactured with the same specification parameters in the manufacturing process, and the required parameter range can be reached only by simple debugging in the practical process.

As shown in fig. 10, fig. 10 is a diagram showing simulation results of the filter in fig. 4. Through experimental tests, the bandwidths of the first filtering branch 13 and the third filtering branch 16 of the present application are in the range of 1804Mhz-1831Mhz, and the bandwidths of the second filtering branch 14 and the fourth filtering branch 17 are in the range of 1711Mhz-1736Mhz, as shown in the first frequency band curve 21 and the second frequency band curve 22 in fig. 10. The first frequency band curve 21 corresponds to simulation results of the first filtering branch 13 and the third filtering branch 16, and the second frequency band curve 22 corresponds to simulation results of the second filtering branch 14 and the fourth filtering branch 17. The first 13 and third 16 filter branches have a bandwidth rejection of more than 90dB in the frequency range below 1710Mhz and a bandwidth rejection of more than 60dB in the frequency range above 1980 Mhz. The second 14 and fourth 17 filter branches have a bandwidth rejection of more than 50dB in the frequency range below 1670Mhz and a bandwidth rejection of more than 30dB in the frequency range above 1755 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the first frequency band curve 21 in fig. 10, the capacitive cross-coupling zero of the first filter branch 13 is zero a, and the frequency of the zero a is 1766Mhz, where the bandwidth rejection is greater than 132 dB. As shown in the second frequency band curve 22 in fig. 10, the inductive cross-coupling zero of the second filtering branch 14 is zero B, and the frequency of the zero B is 1776Mhz, and the bandwidth is always larger than 129 dB.

As shown in fig. 11, fig. 11 is a diagram showing simulation results of the filter in fig. 7. Through experimental tests, the bandwidth of the fifth filtering branch 18 and the bandwidth of the sixth filtering branch 19 of the present application are in the range of 2514Mhz-2676Mhz, such as the third frequency band curve 23 in fig. 11. The bandwidth rejection of the fifth 18 and sixth 19 filter branches is greater than 76dB in the frequency range below 1785Mhz and greater than 77dB in the frequency range above 1885 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the third frequency band curve 23 in fig. 11, one capacitive cross-coupling zero point of the fifth filtering branch 18 is a zero point C, and the frequency of the zero point C is 2500Mhz, where the bandwidth rejection is greater than 60 dB.

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.

Therefore, the filter 10 of the present application can reduce the size of the filter 10 and improve the performance of the filter 10 such as out-of-band rejection.

The present application further provides a communication device, as shown in fig. 12, fig. 12 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device 30 of the present embodiment includes an antenna 31 and a radio frequency unit 32 connected to the antenna 31, the radio frequency unit 32 includes the filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering the radio frequency signal. In other embodiments, the rf Unit 32 may be integrally designed with the Antenna 31 to form an Active Antenna Unit (AAU).

Some embodiments of the present application are referred to as filters, and it is understood that in other embodiments, the present application may also be a combiner, i.e., a dual-frequency combiner.

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 first port disposed on the housing;

2. The filter of claim 1,

seven filter cavities of the first filter branch are divided into four columns arranged along the first direction;

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

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

the fifth filtering cavities of the first filtering branch are in a row;

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

the fifth filtering cavity of the first filtering branch is respectively adjacent to the third filtering cavity, the fourth filtering cavity and the sixth filtering cavity, the fifth filtering cavity to the seventh filtering cavity of the first filtering branch are arranged in a triangular shape, the projection of the center of the sixth filtering cavity in the first direction is positioned between the center of the fifth filtering cavity and the projection of the center of the seventh filtering cavity in the first direction, and the projection of the center of the fifth filtering cavity in the second direction is positioned between the center of the sixth filtering cavity and the projection of the center of the seventh filtering cavity in the second direction;

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

the first filtering cavity of the first filtering branch is further connected with the first port;

and the third filter cavity and the fifth filter cavity of the first filter branch are capacitively and cross-coupled to form a cross-coupling zero point of the first filter branch.

3. The filter of claim 2,

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

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

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

the first filtering cavity of the second filtering branch is further connected with the first port;

and the first filter cavity and the third filter cavity of the second filter branch are inductively cross-coupled to form a cross-coupling zero point of the second filter branch.

4. The filter of claim 3,

the filter further comprises:

the second port and the first port are arranged on the shell at intervals;

the third filtering branch is connected with the second port and is arranged adjacent to the first filtering branch, the third filtering branch is composed of seven filtering cavities which are sequentially coupled, and the seven filtering cavities of the third filtering branch further form a cross-coupling zero point;

and the fourth filtering branch is connected with the second port and is arranged adjacent to the second filtering branch, the fourth filtering branch consists of five filtering cavities which are sequentially coupled, and the five filtering cavities of the fourth filtering branch further form a cross-coupling zero point.

5. The filter of claim 4,

seven filter cavities of the first filter branch and seven filter cavities of the third filter branch are divided into four columns arranged along the first direction;

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

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

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

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

a sixth filter cavity of the third filter branch is respectively adjacent to the seventh filter cavity and the fifth filter cavity;

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

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

the first filtering cavity of the third filtering branch is further connected with the second port;

and the third filter cavity and the fifth filter cavity of the third filter branch are capacitively and cross-coupled to form a cross-coupling zero point of the third filter branch.

6. The filter of claim 5,

five filter cavities of the second filter branch circuit and five filter cavities of the fourth filter branch circuit are divided into four rows arranged along the first direction;

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

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

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

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

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

the fifth filter cavity of the fourth filter branch is further arranged adjacent to the fourth filter cavity of the second filter branch;

the first filtering cavity of the fourth filtering branch is further connected with the second port;

and the first filter cavity and the third filter cavity of the fourth filter branch are inductively cross-coupled to form a cross-coupling zero point of the fourth filter branch.

7. The filter of claim 6,

the filter further comprises:

the fifth filtering branch is arranged adjacent to the third filtering branch and consists of ten filtering cavities which are sequentially coupled, and the ten filtering cavities of the fifth filtering branch further form four cross-coupling zeros;

and the sixth filtering branch is adjacent to the fourth filtering branch and consists of ten filtering cavities which are sequentially coupled, and the ten filtering cavities of the sixth filtering branch further form four cross-coupling zero points.

8. The filter of claim 7,

ten filter cavities of the fifth filter branch are divided into three columns arranged along the second direction;

the fifth filtering cavities and the tenth filtering cavities of the fifth filtering branch are in a row and are sequentially arranged along the first direction;

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

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

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

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

a sixth filtering cavity of the fifth filtering branch is respectively adjacent to the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity, the seventh filtering cavity and the ninth filtering cavity;

a tenth filtering cavity of the fifth filtering branch is respectively adjacent to a ninth filtering cavity, and a first filtering cavity and a second filtering cavity of the third filtering branch;

and the second filtering cavity and the fifth filtering cavity of the fifth filtering branch are in inductive cross coupling respectively with the fourth filtering cavity, the fifth filtering cavity and the seventh filtering cavity, and the fifth filtering cavity and the eighth filtering cavity, and the second filtering cavity and the fifth filtering cavity are in capacitive cross coupling to form four cross coupling zeros of the fifth filtering branch.

9. The filter of claim 8,

ten filter cavities of the sixth filter branch are divided into four columns arranged along the first direction;

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

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

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

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

a sixth filtering cavity of the sixth filtering branch is respectively adjacent to the second filtering cavity, the third filtering cavity, the fifth filtering cavity, the seventh filtering cavity, the eighth filtering cavity and the ninth filtering cavity;

a fourth filter cavity of the fourth filter branch is respectively adjacent to a third filter cavity and a fourth filter cavity of the sixth filter branch;

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

the first filter cavity of the sixth filter branch is respectively adjacent to the tenth filter cavity and the second filter cavity;

the second filter cavity of the fourth filter branch is respectively adjacent to the third filter cavity and the second filter cavity of the sixth filter branch;

and the third filtering cavity and the fifth filtering cavity of the sixth filtering branch are in capacitive cross coupling, the third filtering cavity and the sixth filtering cavity are in inductive cross coupling, the sixth filtering cavity and the eighth filtering cavity are in inductive cross coupling, and the sixth filtering cavity and the ninth filtering cavity are in inductive cross coupling, so that four cross coupling zeros of the sixth filtering branch are formed.

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