CN113054356A

CN113054356A - Filter and communication equipment

Info

Publication number: CN113054356A
Application number: CN201911381060.1A
Authority: CN
Inventors: 温世议; 钟志波; 周峰; 龚爱强
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 present application discloses a filter and a communication device. The filter includes: a casing with vertical first and second directions, with first and second ports; the first and second receiving filtering branches, both of which are composed of eight filter cavities coupled in sequence, each forming two The first and second transmit filter branches are composed of ten filter cavities coupled in sequence, each forming four coupling zero points; the first and second receive filter branches are arranged along the first direction, the first, The second transmit filtering branch is arranged along the first direction, the first receiving filtering branch and the first transmitting filtering branch are arranged along the second direction, and the second receiving filtering branch and the second transmitting filtering branch are arranged along the second direction; The first receiving filtering branch and the first transmitting filtering branch are connected to the first port, and the second receiving filtering branch and the second transmitting filtering branch are connected to the second port. The size of the filter can be reduced and its cost can be reduced.

Description

Filter and communication equipment

Technical Field

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

Background

In a base station system for mobile communication, communication signals carrying communication data in a specific frequency range are generally transmitted through a transmitting antenna, and the communication signals are received through a receiving antenna. The signal received by the receiving antenna contains not only the communication signal carrying the communication data within the specific frequency range, but also a number of clutter or interference signals outside the specific frequency range. To obtain the communication signal carrying communication data in a specific frequency range transmitted by the transmitting antenna from the signal received by the receiving antenna, the signal received by the receiving antenna is usually filtered by a filter to filter out clutter or interference signals outside the specific frequency of the communication signal carrying communication data.

The inventor of the application finds that the volume and the number of taps of the existing filter are increased along with the increase of filter branches, so that the number of taps and the number of welding points are large, and the cost is high; with the increase of the filter branches, the row cavities are not reasonable, resulting in a larger filter volume.

Disclosure of Invention

The application provides a wave filter and communication equipment to the filtering chamber of the receiving and dispatching branch road that makes the wave filter arranges rationally, avoids the length overlength of certain direction of wave filter, thereby reduces the volume of wave filter, in order to reduce the quantity of taking a percentage and welding point, reduce cost.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes: the device comprises a shell, a first connecting piece and a second connecting piece, wherein the shell is provided with a first direction and a second direction which are perpendicular to each other; the first receiving filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a first coupling path, and two coupling zeros of the first receiving filtering branch are formed; the second receiving filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a third coupling path, and two coupling zeros of the second receiving filtering branch are formed; the first transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and four coupling zeros of the first transmitting and filtering branch are formed; the second transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a fourth coupling path, and four coupling zeros of the second transmitting and filtering branch are formed; wherein the first receiving filter branch and the second receiving filter branch are arranged along the first direction, the first transmitting filter branch and the second transmitting filter branch are arranged along the first direction, the first receiving filter branch and the first transmitting filter branch are arranged along the second direction, and the second receiving filter branch and the second transmitting filter branch are arranged along the second direction; the first filtering cavity of the first receiving filtering branch and the first filtering cavity of the first transmitting filtering branch are both connected with the first port, and the first filtering cavity of the second receiving filtering branch and the first filtering cavity of the second transmitting filtering branch are both connected with the second port.

In order to solve the technical problem, the application adopts a technical scheme that: a communication device is provided. The communication equipment comprises an antenna and a radio frequency unit connected with the antenna, wherein the radio frequency unit comprises the filter and is used for filtering radio frequency signals.

The beneficial effects of the embodiment of the application are that: different from the prior art, the filter of the embodiment of the application comprises: the device comprises a shell, a first connecting piece and a second connecting piece, wherein the shell is provided with a first direction and a second direction which are perpendicular to each other; the first receiving filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a first coupling path, and two coupling zeros of the first receiving filtering branch are formed; the second receiving filter branch is arranged on the shell and consists of eight filter cavities which are sequentially coupled along a third coupling path, and two coupling zeros of the second receiving filter branch are formed; the first transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and four coupling zeros of the first transmitting and filtering branch are formed; the second transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a fourth coupling path, and four coupling zeros of the second transmitting and filtering branch are formed; the first receiving filter branch and the second receiving filter branch are arranged along a first direction, the first transmitting filter branch and the second transmitting filter branch are arranged along the first direction, the first receiving filter branch and the first transmitting filter branch are arranged along a second direction, and the second receiving filter branch and the second transmitting filter branch are arranged along the second direction; the first filtering cavity of the first receiving filtering branch and the first filtering cavity of the first transmitting filtering branch are both connected with the first port, and the first filtering cavity of the second receiving filtering branch and the first filtering cavity of the second transmitting filtering branch are both connected with the second port. In this way, the two receiving filtering branches are arranged along the first direction of the shell, the two transmitting filtering branches are arranged along the first direction of the shell, but the receiving filtering branches and the transmitting filtering branches are arranged along the second direction of the shell, so that the length of the filter in a certain direction can be prevented from being too long, the size of the filter is reduced, the whole filter is relatively square, and the design requirement of miniaturization is met; in addition, the first receiving filter branch and the first transmitting filter branch of the filter share the first port, and the second receiving filter branch and the second transmitting filter branch share the second port, so that the number of ports of the filter can be reduced, the number of taps of the filter for the ports and the number of tap welding points can be reduced, and the cost of the filter can be reduced.

Drawings

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

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

FIG. 2 is a schematic diagram of a topology of a first receiving filter branch in an embodiment of a filter of the present application;

fig. 3 is a schematic diagram of a topology of a first transmit filter branch in an embodiment of a filter of the present application;

FIG. 4 is a schematic diagram of a topology of a second receiving filter branch in an embodiment of the filter of the present application;

FIG. 5 is a schematic diagram of a topology of a second transmit filter branch in an embodiment of a filter of the present application;

FIG. 6 is a schematic diagram of a topology of a third receiving filter branch in an embodiment of the filter of the present application;

fig. 7 is a schematic diagram of a topology of a third transmit filter branch in an embodiment of the filter of the present application;

FIG. 8 is a schematic diagram of a topology of a fourth receiving filter branch in an embodiment of the filter of the present application;

fig. 9 is a schematic diagram of a topology of a fourth transmit filter branch in an embodiment of a filter of the present application;

FIG. 10 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

FIG. 11 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

fig. 12 is a schematic structural diagram of an embodiment of the communication device of the present application.

Detailed Description

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

The terms "first" and "second" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The present application first proposes a filter, as shown in fig. 1 to 10, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 2 is a schematic diagram of a topology of a first receiving filter branch in an embodiment of a filter of the present application; fig. 3 is a schematic diagram of a topology of a first transmit filter branch in an embodiment of a filter of the present application; FIG. 4 is a schematic diagram of a topology of a second receiving filter branch in an embodiment of the filter of the present application; FIG. 5 is a schematic diagram of a topology of a second transmit filter branch in an embodiment of a filter of the present application; FIG. 6 is a schematic diagram of a topology of a third receiving filter branch in an embodiment of the filter of the present application; fig. 7 is a schematic diagram of a topology of a third transmit filter branch in an embodiment of the filter of the present application; FIG. 8 is a schematic diagram of a topology of a fourth receiving filter branch in an embodiment of the filter of the present application; fig. 9 is a schematic diagram of a topology of a fourth transmit filter branch in an embodiment of a filter of the present application; FIG. 10 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes: the antenna comprises a shell 11, a first receiving filter branch 12, a first transmitting filter branch 13, a second receiving filter branch 14 and a second transmitting filter branch 15, wherein the shell 11 has a first direction x and a second direction y which are perpendicular to each other, and the shell 11 is provided with a first port (not shown) and a second port (not shown); the first receiving filter branch 12 is arranged on the housing 11, the first receiving filter branch 12 is composed of eight filter cavities a1-A8 coupled in sequence along a first coupling path, and the eight filter cavities a1-A8 of the first receiving filter branch 12 form two coupling zeros of the first receiving filter branch 12; the first emission filtering branch 13 is arranged on the housing 11, the first emission filtering branch 13 is composed of ten filtering cavities B1-B10 coupled in sequence along the second coupling path, and the ten filtering cavities B1-B10 of the first emission filtering branch 13 form four coupling zeros of the first emission filtering branch 13; the second receiving filter branch 14 is composed of eight filter cavities C1-C8 coupled in sequence along a third coupling path, and forms two coupling zeros of the second receiving filter branch 14; the second transmitting and filtering branch 15, the second transmitting and filtering branch 15 is composed of ten filtering cavities D1-D10 coupled in sequence along a fourth coupling path, and four coupling zeros of the second transmitting and filtering branch 15 are formed; the first receiving filter branch 12 and the second receiving filter branch 14 are arranged along a first direction x, the first transmitting filter branch 13 and the second transmitting filter branch 15 are arranged along the first direction x, the first receiving filter branch 12 and the first transmitting filter branch 13 are arranged along a second direction y, and the second receiving filter branch 14 and the second transmitting filter branch 15 are arranged along the second direction y; the first filter cavity a1 of the first receiving filter branch 12 and the first filter cavity B1 of the first transmitting filter branch 13 are both connected to the first port, and the first filter cavity C2 of the second receiving filter branch 14 and the first filter cavity D1 of the second transmitting filter branch 15 are both connected to the second port.

In the embodiment, the two receiving filtering branches are arranged along the first direction x of the housing, the two transmitting filtering branches are arranged along the first direction x of the housing, but the receiving filtering branches and the transmitting filtering branches are arranged along the second direction y of the housing, so that the length of the filter 10 in a certain direction can be prevented from being too long, the size of the filter 10 is reduced, the filter 10 is relatively square as a whole, and the design requirement of miniaturization is met; in addition, the first receiving filtering branch 12 and the first transmitting filtering branch 13 of the filter 10 of the present embodiment share the first port, and the second receiving filtering branch 14 and the second transmitting filtering branch 15 share the second port, so that the number of ports of the filter 10 can be reduced, and the number of taps and tap welding points of the filter 10 for the ports can be reduced, thereby reducing the cost of the filter 10.

As shown in fig. 1, the eight filter cavities a1-A8 of the first receiving filter branch 12 include: a first filter cavity A1, a second filter cavity A2, a third filter cavity A3, a fourth filter cavity A4, a fifth filter cavity A5, a sixth filter cavity A6, a seventh filter cavity A7 and an eighth filter cavity A8; the ten filter cavities B1-B10 of the first transmit filter branch 13 comprise: a first filter cavity B1, a second filter cavity B2, a third filter cavity B3, a fourth filter cavity B4, a fifth filter cavity B5, a sixth filter cavity B6, a seventh filter cavity B7, an eighth filter cavity B8, a ninth filter cavity B9 and a tenth filter cavity B10.

In addition, the filtering branches of the embodiment of the application are provided with coupling zero points, so that the characteristics of out-of-band rejection and the like of signals of the filtering branches can be improved.

Alternatively, as shown in fig. 1, the eight filter cavities a1-A8 of the first receiving filter branch 12 are arranged adjacently in sequence along the first coupling path; the first filtering cavity a1, the second filtering cavity a2, the sixth filtering cavity A6 and the seventh filtering cavity a7 of the first receiving filtering branch 12 are arranged in a diamond shape, the first filtering cavity a1, the second filtering cavity a2, the fifth filtering cavity a5 and the sixth filtering cavity A6 of the first receiving filtering branch 12 are arranged in a diamond shape, and the second filtering cavity a2, the third filtering cavity A3, the fourth filtering cavity a4 and the fifth filtering cavity a5 of the first receiving filtering branch 12 are arranged in a diamond shape; the projections of the first filter cavity a1, the second filter cavity a2 and the third filter cavity A3 of the first receiving filter branch 12 in the first direction x overlap, and the projections of the fourth filter cavity a4, the fifth filter cavity a5, the sixth filter cavity a6 and the seventh filter cavity a7 of the first receiving filter branch 12 in the first direction x overlap.

As can be seen from the above analysis, the seven filter cavities a1-a7 of the first receiving filter branch 12 are arranged in two rows, which can shorten the arrangement space of the first receiving filter branch 12 in the second direction y; and two rows of filtering cavities are adjacently arranged, a plurality of filtering cavities in each row are sequentially adjacently arranged, and the two rows of filtering cavities are staggered, so that the arrangement space of the first receiving filtering branch circuit 12 can be reduced.

As shown in fig. 1, the eighth filter cavity A8 of the first receiving filter branch 12 is close to the bisectrix of the housing 11 in the first direction x and the bisectrix of the housing 11 in the second direction y with respect to the seventh filter cavity a7 of the first receiving filter branch 12, and a projection of the center of the seventh filter cavity a7 of the first receiving filter branch 12 in the first direction x is located between a center of the first filter cavity a1 of the first receiving filter branch 12 and a projection of the center of the eighth filter cavity A8 of the first receiving filter branch 12 in the first direction x.

This cavity array structure can prevent the eighth filter cavity A8 from being arranged in a line shape with any one of the two rows of filter cavities of the first receiving filter branch 12, and can reduce the arrangement space of the first receiving filter branch 12 in the second direction y.

Further, as shown in fig. 1, the eight filter cavities a1-A8 of the first receiving filter branch 12 have the same size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the first receiving filter branch 12 can be more compact, and the arrangement space of the first receiving filter branch 12 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, inductive cross-coupling is performed between the second filter cavity a2 of the first receiving filter branch 12 and the fifth filter cavity a5 of the first receiving filter branch 12, and between the third filter cavity A3 of the first receiving filter branch 12 and the fifth filter cavity a5 of the first receiving filter branch 12, respectively, to form two inductive coupling zeros of the first receiving filter branch 12.

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

Generally, the inductive coupling zero point is realized by a window, and a metal coupling rib is arranged on the window. That is, a window and a metal coupling rib (equivalent to the capacitor L1 shown in fig. 2) are disposed between the second filter cavity a2 of the first receiving filter branch 12 and the fifth filter cavity a5 of the first receiving filter branch 12, and a window and a metal coupling rib (equivalent to the capacitor L2 shown in fig. 2) are disposed between the third filter cavity A3 of the first receiving filter branch 12 and the fifth filter cavity a5 of the first receiving filter branch 12.

The coupling zero points of the first receiving and filtering branch 12 are all inductive coupling zero points, which can improve the consistency of the materials of the first receiving and filtering branch 12, and in this embodiment, inductive cross coupling is realized through the metal coupling rib, and the metal coupling rib is subject to little change of the external temperature, which can reduce the temperature drift of the first receiving and filtering branch 12.

Optionally, ten filter cavities B1-B10 of the first emission filter branch 13 are arranged adjacently in sequence along the second coupling path; the second filtering cavity B2, the third filtering cavity B3, the fourth filtering cavity B4 and the fifth filtering cavity B5 of the first transmitting and filtering branch 13 are arranged in a diamond shape, the third filtering cavity B3, the fourth filtering cavity B4, the fifth filtering cavity B5 and the sixth filtering cavity B6 of the first transmitting and filtering branch 13 are arranged in a diamond shape, the fifth filtering cavity B5, the sixth filtering cavity B6, the seventh filtering cavity B7 and the eighth filtering cavity B8 of the first transmitting and filtering branch 13 are arranged in a diamond shape, and the seventh filtering cavity B7, the eighth filtering cavity B8, the ninth filtering cavity B9 and the tenth filtering cavity B10 of the first transmitting and filtering branch 12 are arranged in a diamond shape; the projections of the second filter cavity B2, the third filter cavity B3, the sixth filter cavity B6, the seventh filter cavity B7 and the tenth filter cavity B10 of the first emission filter branch 13 in the first direction x are overlapped, and the projections of the fourth filter cavity B4, the fifth filter cavity B5, the eighth filter cavity B8 and the ninth filter cavity B9 of the first emission filter branch 13 in the first direction x are overlapped.

As can be seen from the above analysis, the nine filter cavities B2-B10 of the first emission filter branch 13 are arranged in two rows, which can shorten the arrangement space of the first emission filter branch 13 in the second direction y; and two filter chambers are adjacently arranged, a plurality of filter chambers in each row are sequentially adjacently arranged, and the two rows of filter chambers are arranged in a staggered manner, so that the arrangement space of the first emission filter branch circuit 13 can be reduced.

As shown in fig. 1, the second filter cavity B2 of the first transmitting filter branch 13 is close to the bisectrix of the housing 11 in the first direction x and the bisectrix of the housing 11 in the second direction y with respect to the first filter cavity B1 of the first transmitting filter branch 13, and the projection of the center of the first filter cavity B1 in the first direction x is located between the projection of the center of the second filter cavity B2 and the projection of the center of the fourth filter cavity B4 in the first direction x.

This cavity array structure can prevent the first filter cavity B1 from being arranged in a line shape with any one of the two rows of filter cavities of the first emission filter branch 13, and can reduce the arrangement space of the first emission filter branch 13 in the second direction y.

Further, as shown in fig. 1, the ten filter cavities B1-B10 of the first emission filter branch 13 have the same size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the first emission filter branch 13 can be more compact, and the arrangement space of the first emission filter branch 13 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, inductive cross-coupling is performed between the third filter cavity B3 of the first transmit filter branch 13 and the fifth filter cavity B5 of the first transmit filter branch 13, and between the seventh filter cavity B7 of the first transmit filter branch 13 and the tenth filter cavity B10 of the first transmit filter branch 13, respectively, to form two inductive coupling zeros of the first transmit filter branch 13; capacitive cross coupling is respectively formed between the seventh filter cavity B7 of the first transmitting filter branch 13 and the ninth filter cavity B9 of the first transmitting filter branch 13, and between the third filter cavity B3 of the first transmitting filter branch 13 and the sixth filter cavity B6 of the first transmitting filter branch 13, so as to form two capacitive coupling zeros of the first transmitting filter branch 13.

As shown in fig. 3, a window and a metal coupling rib (equivalent to the capacitor L3 shown in fig. 3) are disposed between the third filter cavity B3 of the first transmitting and filtering branch 13 and the fifth filter cavity B5 of the first transmitting and filtering branch 13, and a window and a metal coupling rib (equivalent to the capacitor L4 shown in fig. 3) are disposed between the seventh filter cavity B7 of the first transmitting and filtering branch 13 and the tenth filter cavity B10 of the first transmitting and filtering branch 13; in the embodiment, the inductive cross coupling is realized through the metal coupling rib, the metal coupling rib is slightly changed by the external temperature, and the temperature drift of the first transmitting and filtering branch 13 can be reduced.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. As shown in fig. 3, that is, a flying bar (equivalent to the capacitor C1 shown in fig. 3) is disposed between the third filter cavity B3 of the first transmitting filter branch 13 and the sixth filter cavity B6 of the first transmitting filter branch 13, and a flying bar (equivalent to the capacitor C2 shown in fig. 3) is disposed between the seventh filter cavity B7 of the first transmitting filter branch 13 and the ninth filter cavity B9 of the first transmitting filter branch 13.

In this embodiment, the inductive coupling zero is set in the first receiving filtering branch 12, and the capacitive coupling zero is set in the first transmitting filtering branch 13, so that the signal isolation between the first receiving filtering branch 12 and the first transmitting filtering branch 13 can be improved.

As shown in fig. 1, the eight filter cavities C1-C8 of the second receiving filter branch 14 include: 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, a sixth filter cavity C6, a seventh filter cavity C7 and an eighth filter cavity C8.

The coupling zero points of the second receiving and filtering branch 14 are all inductive coupling zero points, which can improve the consistency of materials, reduce the types of materials, and reduce the temperature drift of the second receiving and filtering branch 14. And the coupling zero can improve the characteristics of out-of-band rejection and the like of the signal of the second receiving and filtering branch 14.

As shown in fig. 1, the eight filter cavities C1-C8 of the second receiving filter branch 14 are arranged adjacently in sequence along the third coupling path; the first filtering cavity C1, the second filtering cavity C2, the sixth filtering cavity C6 and the seventh filtering cavity C7 of the second receiving filtering branch 14 are arranged in a diamond shape, the first filtering cavity C1, the second filtering cavity C2, the fifth filtering cavity C5 and the sixth filtering cavity C6 of the second receiving filtering branch 14 are arranged in a diamond shape, and the second filtering cavity C2, the third filtering cavity C3, the fourth filtering cavity C4 and the fifth filtering cavity C5 of the second receiving filtering branch 14 are arranged in a diamond shape; the projections of the first filter cavity C1, the second filter cavity C2 and the third filter cavity C3 of the second receiving filter branch 14 in the first direction x overlap, and the projections of the fourth filter cavity C4, the fifth filter cavity C5, the sixth filter cavity C6 and the seventh filter cavity C7 of the second receiving filter branch 14 in the first direction x overlap.

As can be seen from the above analysis, the seven filter cavities C1-C7 of the second receiving filter branch 14 are arranged in two rows, which can shorten the arrangement space of the second receiving filter branch 14 in the second direction y; and two rows of filtering cavities are adjacently arranged, a plurality of filtering cavities in each row are sequentially adjacently arranged, and the two rows of filtering cavities are staggered, so that the arrangement space of the second receiving filtering branch circuit 14 can be reduced.

As shown in fig. 1, the eighth filter cavity C8 of the second receiving filter branch 14 is close to the bisectrix of the housing 11 in the first direction x and the bisectrix of the housing 11 in the second direction y with respect to the seventh filter cavity C7 of the second receiving filter branch 14, and a projection of the center of the eighth filter cavity C8 of the second receiving filter branch 14 in the first direction x is located between a projection of the center of the first filter cavity C1 of the second receiving filter branch 14 and a projection of the center of the seventh filter cavity C7 of the second receiving filter branch 14 in the first direction x.

This cavity array structure can prevent the eighth filter cavity C8 from being arranged in a line shape with any one of the two rows of filter cavities of the second receiving filter branch 14, and can reduce the arrangement space of the second receiving filter branch 14 in the second direction y.

Further, as shown in fig. 1, the eight filter cavities C1-C8 of the second receiving filter branch 14 have the same size, and as can be known from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the second receiving filter branch 14 can be more compact, and the arrangement space of the second receiving filter branch 14 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, the coupling zero distribution of the second receiving filter branch 14 is the same as that of the first receiving filter branch 12; specifically, the inductive cross-coupling is respectively formed between the second filter cavity C2 of the second receiving and filtering branch 14 and the fifth filter cavity C5 of the second receiving and filtering branch 14, and between the third filter cavity C3 of the second receiving and filtering branch 14 and the fifth filter cavity C5 of the second receiving and filtering branch 14, so as to form two inductive coupling zeros of the second receiving and filtering branch 14.

As shown in fig. 4, a window and a metal coupling rib (equivalent to the capacitor L5 shown in fig. 4) are disposed between the second filter cavity C2 of the second receiving filter branch 14 and the fifth filter cavity C5 of the second receiving filter branch 14, and a window and a metal coupling rib (equivalent to the capacitor L6 shown in fig. 4) are disposed between the third filter cavity C3 of the second receiving filter branch 14 and the fifth filter cavity C5 of the second receiving filter branch 14; in this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subjected to a small change of the external temperature, so that the temperature drift of the second receiving filtering branch 14 can be reduced.

As shown in fig. 1, the ten filter cavities D1-D10 of the second transmitting filter branch 15 include: the filter comprises a first filter cavity D1, a second filter cavity D2, a third filter cavity D3, a fourth filter cavity D4, a fifth filter cavity D5, a sixth filter cavity D6, a seventh filter cavity D7, an eighth filter cavity D8, a ninth filter cavity D9 and a tenth filter cavity D10.

As shown in fig. 1, the structures of the third filter cavity D3 through the tenth filter cavity D10 of the second transmitting filter branch 15 are the same as the structures of the third filter cavity B3 through the tenth filter cavity B10 of the first transmitting filter branch 13. Specifically, eight filter cavities D3-D10 of the second transmitting filter branch 15 are arranged adjacently in sequence along a fourth coupling path; the third filtering cavity D3, the fourth filtering cavity D4, the fifth filtering cavity D5 and the sixth filtering cavity D6 of the second emission filtering branch 15 are arranged in a diamond shape, the fifth filtering cavity D5, the sixth filtering cavity D6, the seventh filtering cavity D7 and the eighth filtering cavity D8 of the second emission filtering branch 15 are arranged in a diamond shape, and the seventh filtering cavity D7, the eighth filtering cavity D8, the ninth filtering cavity D9 and the tenth filtering cavity D10 of the second emission filtering branch 15 are arranged in a diamond shape; the projections of the third filter cavity D3, the sixth filter cavity D6, the seventh filter cavity D7 and the tenth filter cavity D10 of the second emission filter branch 15 in the first direction x overlap, and the projections of the fourth filter cavity D4, the fifth filter cavity D5, the eighth filter cavity D8 and the ninth filter cavity D9 of the second emission filter branch 15 in the first direction x overlap.

From the above analysis, it can be seen that the eight filter cavities D3-D10 of the second emission filter branch 15 are arranged in two rows, which can shorten the arrangement space of the second emission filter branch 15 in the second direction y; and two are listed as the adjacent setting of filter chamber, and a plurality of filter chambers in every are listed as adjacent setting in proper order, and this two are listed as the crisscross setting of filter chamber, can reduce the space of arranging of second transmission filtering branch road 15.

As shown in fig. 1, the second filter cavity D2 of the second transmitting filter branch 15 is disposed adjacent to the first filter cavity D1 and the third filter cavity D3; the second filter cavity D2 of the second transmitting filter branch 15 is close to the bisector of the housing 11 in the first direction x relative to the third filter cavity D3 of the second transmitting filter branch 15, and the projection of the center of the second filter cavity D2 in the second direction y is located between the center of the first filter cavity D1 and the projection of the center of the third filter cavity D3 in the second direction y.

This cavity arrangement structure can prevent any one of the two rows of filter cavities of the first filter cavity D1, the second filter cavity D2 and the second emission filter branch 15 from being arranged in a "one" shape, and can reduce the arrangement space of the second emission filter branch 15 in the second direction y.

Further, as shown in fig. 1, the ten filter cavities D1-D10 of the second emission filter branch 15 have the same size, and as can be known from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the second emission filter branch 15 can be more compact, and the arrangement space of the second emission filter branch 15 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, capacitive cross coupling is respectively performed between the third filter cavity D3 of the second transmitting filter branch 15 and the fifth filter cavity B5 of the second transmitting filter branch 15, and between the seventh filter cavity D7 of the second transmitting filter branch 15 and the tenth filter cavity D10 of the second transmitting filter branch 15, so as to form two capacitive coupling zeros of the second transmitting filter branch 15; inductive cross coupling is respectively formed between the seventh filter cavity D7 of the second transmitting filter branch circuit 15 and the ninth filter cavity D9 of the second transmitting filter branch circuit 15, and between the third filter cavity D3 of the second transmitting filter branch circuit 15 and the sixth filter cavity D6 of the second transmitting filter branch circuit 15, so as to form two inductive coupling zeros of the second transmitting filter branch circuit 15.

As shown in fig. 5, a window and a metal coupling rib (equivalent to the capacitor L7 shown in fig. 5) are disposed between the third filter cavity D3 of the second transmitting filter branch 15 and the sixth filter cavity D6 of the second transmitting filter branch 15, and a window and a metal coupling rib (equivalent to the capacitor L8 shown in fig. 5) are disposed between the seventh filter cavity D7 of the second transmitting filter branch 15 and the ninth filter cavity D9 of the second transmitting filter branch 15; in this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subject to a small change of the external temperature, so that the temperature drift of the second transmitting and filtering branch 15 can be reduced.

As shown in fig. 5, a flying bar (equivalent to the capacitor C3 shown in fig. 5) is disposed between the third filter cavity D3 of the second transmitting filter branch 15 and the fifth filter cavity D5 of the second transmitting filter branch 15, and a flying bar (equivalent to the capacitor C4 shown in fig. 5) is disposed between the seventh filter cavity D7 of the second transmitting filter branch 15 and the tenth filter cavity D10 of the second transmitting filter branch 15.

In this embodiment, the inductive coupling zero is set in the second receiving filtering branch 14, and the capacitive coupling zero is set in the second transmitting filtering branch 15, so that the signal isolation between the second receiving filtering branch 14 and the second transmitting filtering branch 15 can be improved.

Optionally, as shown in fig. 1, the filter 10 further includes a third receiving filtering branch 16 disposed on the housing 11, where the third receiving filtering branch 16 is composed of eight filtering cavities E1-E8 coupled in sequence along a fifth coupling path, and forms two inductive coupling zeros of the third receiving filtering branch 16. Wherein the eight filter cavities E1-E8 of the third receiving filter branch 16 include: a first filter cavity E1, a second filter cavity E2, a third filter cavity E3, a fourth filter cavity E4, a fifth filter cavity E5, a sixth filter cavity E6, a seventh filter cavity E7 and an eighth filter cavity E8.

The coupling zero points of the third receiving and filtering branch 16 are all inductive coupling zero points, which can improve the consistency of the materials, reduce the types of the materials, and reduce the temperature drift of the third receiving and filtering branch 16. And the coupling zero can improve the characteristics of the third receiving filter branch 16, such as out-of-band rejection of the signal.

As shown in fig. 1, the third receiving filter branch 16 has the same structure as the second receiving filter branch 14. Specifically, eight filter cavities E1-E8 of the third receiving filter branch 16 are arranged adjacently in sequence along a fifth coupling path; the first filter cavity E1, the second filter cavity E2, the sixth filter cavity E6 and the seventh filter cavity E7 of the third receiving filter branch 16 are arranged in a diamond shape, the first filter cavity E1, the second filter cavity E2, the fifth filter cavity E5 and the sixth filter cavity E6 of the third receiving filter branch 16 are arranged in a diamond shape, and the second filter cavity E2, the third filter cavity E3, the fourth filter cavity E4 and the fifth filter cavity E5 of the third receiving filter branch 16 are arranged in a diamond shape; the projections of the first filter cavity E1, the second filter cavity E2 and the third filter cavity E3 of the third receiving filter branch 16 in the first direction x overlap, and the projections of the fourth filter cavity E4, the fifth filter cavity E5, the sixth filter cavity E6 and the seventh filter cavity E7 of the third receiving filter branch 16 in the first direction x overlap.

As can be seen from the above analysis, the seven filter cavities E1-E7 of the third receiving filter branch 16 are arranged in two rows, which can shorten the arrangement space of the third receiving filter branch 16 in the second direction y; and two rows of filter cavities are adjacently arranged, a plurality of filter cavities in each row are sequentially adjacently arranged, and the two rows of filter cavities are staggered, so that the arrangement space of the third receiving filter branch circuit 16 can be reduced.

As shown in fig. 1, the eighth filter cavity E8 of the third receiving filter branch 16 is close to the bisectrix of the housing 11 in the first direction x and the bisectrix of the housing 11 in the second direction y with respect to the seventh filter cavity E7 of the third receiving filter branch 16, and the projection of the center of the eighth filter cavity E8 of the third receiving filter branch 16 in the first direction x is located between the center of the first filter cavity E1 of the third receiving filter branch 16 and the projection of the center of the seventh filter cavity E7 of the third receiving filter branch 16 in the first direction x.

This cavity array structure can prevent the eighth filter cavity E8 from being arranged in a line shape with any one of the two rows of filter cavities of the third receiving filter branch 16, and can reduce the arrangement space of the third receiving filter branch 16 in the second direction y.

Further, as shown in fig. 1, the eight filter cavities E1-E8 of the third receiving filter branch 16 have the same size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the third receiving filter branch 16 can be more compact, and the arrangement space of the third receiving filter branch 16 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, the coupling zero distribution of the third receiving filter branch 16 is the same as that of the second receiving filter branch 14; specifically, the two inductive coupling zeros of the third receiving and filtering branch 16 are formed by inductive cross coupling between the second filter cavity E2 of the third receiving and filtering branch 16 and the fifth filter cavity E5 of the third receiving and filtering branch 16, and between the third filter cavity E3 of the third receiving and filtering branch 16 and the fifth filter cavity E5 of the third receiving and filtering branch 16, respectively.

As shown in fig. 6, a window and a metal coupling rib (equivalent to the capacitor L9 shown in fig. 6) are disposed between the second filter cavity E2 of the third receiving filter branch 16 and the fifth filter cavity E5 of the third receiving filter branch 16, and a window and a metal coupling rib (equivalent to the capacitor L10 shown in fig. 6) are disposed between the third filter cavity E3 of the third receiving filter branch 16 and the fifth filter cavity E5 of the third receiving filter branch 16; 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 that the temperature drift of the third receiving filtering branch 16 can be reduced.

Optionally, as shown in fig. 1, the filter 10 further includes a third transmitting filter branch 17, where the third transmitting filter branch 17 is composed of ten filter cavities F1-F0 coupled in sequence along a sixth coupling path, and forms four coupling zeros of the third transmitting filter branch 17; the coupling zero can improve the out-of-band rejection and other characteristics of the signal of the third transmitting and filtering branch 17.

As shown in fig. 1, the ten filter cavities F1-F10 of the third transmitting filter branch 17 comprise: a first filter cavity F1, a second filter cavity F2, a third filter cavity F3, a fourth filter cavity F4, a fifth filter cavity F5, a sixth filter cavity F6, a seventh filter cavity F7, an eighth filter cavity F8, a ninth filter cavity F9 and a tenth filter cavity F10.

As shown in fig. 1, the structures of the third filter cavity F3 through the tenth filter cavity F10 of the third transmitting filter branch 17 are the same as the structures of the third filter cavity D3 through the tenth filter cavity D10 of the second transmitting filter branch 15. Specifically, eight filter cavities F3-F10 of the third transmitting filter branch 17 are sequentially and adjacently arranged along the sixth coupling path; the third filter cavity F3, the fourth filter cavity F4, the fifth filter cavity F5 and the sixth filter cavity F6 of the third emission filter branch 17 are arranged in a diamond shape, the fifth filter cavity F5, the sixth filter cavity F6, the seventh filter cavity F7 and the eighth filter cavity F8 of the third emission filter branch 17 are arranged in a diamond shape, and the seventh filter cavity F7, the eighth filter cavity F8, the ninth filter cavity F9 and the tenth filter cavity F10 of the third emission filter branch 17 are arranged in a diamond shape; the projections of the third filter cavity F3, the sixth filter cavity F6, the seventh filter cavity F7 and the tenth filter cavity F10 of the third emission filter branch 17 in the first direction x overlap, and the projections of the fourth filter cavity F4, the fifth filter cavity F5, the eighth filter cavity F8 and the ninth filter cavity F9 of the third emission filter branch 17 in the first direction x overlap.

From the above analysis, it can be seen that the eight filter cavities F3-F10 of the third emission filter branch 17 are arranged in two rows, which can shorten the arrangement space of the third emission filter branch 17 in the second direction y; and two filter cavities are adjacently arranged, a plurality of filter cavities in each row are sequentially adjacently arranged, and the two rows of filter cavities are staggered, so that the arrangement space of the third emission filter branch 17 can be reduced.

As shown in fig. 1, the second filter chamber F2 of the third transmitting filter branch 17 is arranged adjacent to the first filter chamber F1 and the third filter chamber F3; the second filter cavity F2 of the third transmitting filter branch 17 overlaps the first filter cavity F1 in projection in the first direction x, and the third filter cavity F3 is bisected and drawn together in the first direction x toward the housing 11 with respect to the second filter cavity F2.

The cavity arrangement structure can prevent any one of the two rows of filter cavities of the first filter cavity F1, the second filter cavity F2 and the third emission filter branch 17 from being arranged in a shape like a Chinese character 'yi', and can reduce the arrangement space of the third emission filter branch 17 in the second direction y.

Further, as shown in fig. 1, the ten filter cavities F1-F10 of the third emission filter branch 17 have the same size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the third emission filter branch 17 can be more compact, and the arrangement space of the third emission filter branch 17 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, the distribution of the zero point of the third transmitting filter branch 17 is the same as that of the second transmitting filter branch 15. Specifically, capacitive cross coupling is respectively performed between the third filter cavity F3 of the third transmitting filter branch 17 and the fifth filter cavity F5 of the third transmitting filter branch 17, and between the seventh filter cavity F7 of the third transmitting filter branch 17 and the tenth filter cavity F10 of the third transmitting filter branch 17, so as to form two capacitive coupling zeros of the third transmitting filter branch 17; inductive cross coupling is respectively formed between the seventh filter cavity F7 of the third transmitting filter branch 17 and the ninth filter cavity F9 of the third transmitting filter branch 17, and between the third filter cavity F3 of the third transmitting filter branch 17 and the sixth filter cavity F6 of the third transmitting filter branch 17, so as to form two inductive coupling zeros of the third transmitting filter branch 17.

As shown in fig. 7, a window and a metal coupling rib (equivalent to the capacitor L11 shown in fig. 7) are disposed between the third filter cavity F3 of the third transmitting filter branch 17 and the sixth filter cavity F6 of the third transmitting filter branch 17, and a window and a metal coupling rib (equivalent to the capacitor L12 shown in fig. 5) are disposed between the seventh filter cavity F7 of the third transmitting filter branch 17 and the ninth filter cavity F9 of the third transmitting filter branch 17; in the embodiment, the inductive cross coupling is realized through the metal coupling rib, the metal coupling rib is slightly changed by the external temperature, and the temperature drift of the third transmitting and filtering branch 17 can be reduced.

As shown in fig. 7, a flying bar (equivalent to the capacitor C5 shown in fig. 7) is disposed between the third filter cavity F3 of the third transmitting filter branch 17 and the fifth filter cavity F5 of the third transmitting filter branch 17, and a flying bar (equivalent to the capacitor C6 shown in fig. 5) is disposed between the seventh filter cavity F7 of the third transmitting filter branch 17 and the tenth filter cavity F10 of the third transmitting filter branch 17.

In this embodiment, the inductive coupling zero is set in the third receiving filtering branch 16, and the capacitive coupling zero is set in the third transmitting filtering branch 17, so that the signal isolation between the third receiving filtering branch 16 and the third transmitting filtering branch 17 can be improved.

As shown in fig. 1, the housing 11 is further provided with a third port (not shown), and the first filter cavity E1 of the third receiving filter branch 16 and the first filter cavity F1 of the third transmitting filter branch 17 are both connected to the third port; the third receiving filtering branch 16 and the third transmitting filtering branch 17 share the second port, so that the number of ports of the filter 10 can be reduced, and the number of taps and tap welding points of the filter 10 for the ports can be reduced, thereby reducing the cost of the filter 10 and improving the flexibility of the configuration thereof.

Optionally, as shown in fig. 1, the filter 10 further includes a fourth receiving filtering branch 18 disposed on the housing 11, where the fourth receiving filtering branch 18 is composed of eight filtering cavities G1-G8 coupled in sequence along a seventh coupling path, and forms two inductive coupling zeros of the fourth receiving filtering branch 18. Wherein the eight filter cavities G1-G8 of the fourth receiving filter branch 18 include: the filter comprises a first filter cavity G1, a second filter cavity G2, a third filter cavity G3, a fourth filter cavity G4, a fifth filter cavity G5, a sixth filter cavity G6, a seventh filter cavity G7 and an eighth filter cavity G8.

The coupling zero points of the fourth receiving and filtering branch circuit 18 are all inductive coupling zero points, which can improve the consistency of materials, reduce the types of materials, and reduce the temperature drift of the fourth receiving and filtering branch circuit 18. And the coupling zero can improve the characteristics of the signal of the fourth receiving and filtering branch 18, such as out-of-band rejection.

As shown in fig. 1, the first filtering cavity G1, the second filtering cavity G2, the third filtering cavity G3, the fourth filtering cavity G4, the sixth filtering cavity G6 and the seventh filtering cavity G7 of the fourth receiving filtering branch 18 are adjacent in sequence and arranged in a regular hexagon, the first filtering cavity G1 and the second filtering cavity G2 of the fourth receiving filtering branch 18 are located on the same side of the regular hexagon, and projections of the first filtering cavity G1 and the second filtering cavity G2 in the first direction x are overlapped; the fifth filtering cavity G5 of the fourth receiving filtering branch 18 is located at the center of the regular hexagon, and is respectively adjacent to the first filtering cavity G1, the second filtering cavity G2, the third filtering cavity G3, the fourth filtering cavity G4, the sixth filtering cavity G6 and the seventh filtering cavity G7 of the fourth receiving filtering branch 18; the eighth filter cavity G8 of the fourth receiving filter branch 18 overlaps with the projection of the sixth filter cavity G6 of the fourth receiving filter branch 18 in the first direction x, and the projection of the center of the seventh filter cavity G7 of the fourth receiving filter branch 18 in the second direction y is located between the center of the eighth filter cavity G8 of the fourth receiving filter branch 18 and the projection of the center of the sixth filter cavity G6 of the fourth receiving filter branch 18 in the second direction y.

As can be seen from the above analysis, the eight filter cavities G1-G8 of the fourth receiving filter branch 18 are arranged in three rows, which can shorten the arrangement space of the fourth receiving filter branch 18 in the second direction y; and three rows of filtering cavities are adjacently arranged, a plurality of filtering cavities in each row are sequentially adjacently arranged, and the two rows of filtering cavities are arranged in a staggered manner, so that the arrangement space of the fourth receiving filtering branch circuit 18 can be reduced.

Further, as shown in fig. 1, the eight filter cavities G1-G8 of the fourth receiving filter branch 18 have the same size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the fourth receiving filter branch 18 can be more compact, and the arrangement space of the fourth receiving filter branch 18 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, the coupling zero distribution of the fourth receiving filter branch 18 is the same as that of the first receiving filter branch 12; specifically, the inductive cross-coupling is respectively formed between the second filter cavity G2 of the fourth receiving filter branch 18 and the fifth filter cavity G5 of the fourth receiving filter branch 18, and between the third filter cavity G3 of the fourth receiving filter branch 18 and the fifth filter cavity F5 of the fourth receiving filter branch 18, so as to form two inductive coupling zeros of the fourth receiving filter branch 18.

As shown in fig. 8, a window and a metal coupling rib (equivalent to the capacitor L13 shown in fig. 8) are disposed between the second filter cavity G2 of the fourth receiving filter branch 18 and the fifth filter cavity G5 of the fourth receiving filter branch 18, and a window and a metal coupling rib (equivalent to the capacitor L14 shown in fig. 8) are disposed between the third filter cavity G3 of the fourth receiving filter branch 18 and the fifth filter cavity G5 of the fourth receiving filter branch 18; 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 that the temperature drift of the fourth receiving filtering branch 18 can be reduced.

Optionally, as shown in fig. 1, the filter 10 further includes a fourth emission filter branch 19, where the fourth emission filter branch 19 is disposed on the housing 11, and is composed of ten filter cavities H1-H0 coupled in sequence along an eighth coupling path, and forms four coupling zeros of the fourth emission filter branch 19; the coupling zero can improve the out-of-band rejection and other characteristics of the signal of the fourth transmitting and filtering branch 19.

As shown in fig. 1, the ten filter cavities H1-H10 of the fourth transmit filter branch 19 include: the filter comprises a first filter cavity H1, a second filter cavity H2, a third filter cavity H3, a fourth filter cavity H4, a fifth filter cavity H5, a sixth filter cavity H6, a seventh filter cavity H7, an eighth filter cavity H8, a ninth filter cavity H9 and a tenth filter cavity H10.

As shown in fig. 1, the ten filter cavities H3-H10 of the fourth transmitting filter branch 19 are arranged next to each other in sequence along the eighth coupling path; the third filtering cavity H3, the fourth filtering cavity H4, the fifth filtering cavity H5 and the sixth filtering cavity H6 of the fourth emission filtering branch 19 are arranged in a diamond shape, the fifth filtering cavity H5, the sixth filtering cavity H6, the seventh filtering cavity H7 and the eighth filtering cavity H8 of the fourth emission filtering branch 19 are arranged in a diamond shape, and the seventh filtering cavity H7, the eighth filtering cavity H8, the ninth filtering cavity H9 and the tenth filtering cavity H10 of the fourth emission filtering branch 19 are arranged in a diamond shape; the projections of the second filter cavity H2, the third filter cavity H3, the sixth filter cavity F6, the seventh filter cavity F7 and the tenth filter cavity F10 of the fourth emission filter branch 19 in the first direction x are overlapped, and the projections of the fourth filter cavity H4, the fifth filter cavity H5, the eighth filter cavity H8 and the ninth filter cavity H9 of the fourth emission filter branch 19 in the first direction x are overlapped.

From the above analysis, it can be seen that the nine filter cavities H2-H10 of the fourth emission filter branch 19 are arranged in two rows, which can shorten the arrangement space of the fourth emission filter branch 19 in the second direction y; and two rows of filtering cavities are adjacently arranged, a plurality of filtering cavities in each row are sequentially adjacently arranged, and the two rows of filtering cavities are staggered, so that the arrangement space of the fourth transmitting filtering branch circuit 19 can be reduced.

As shown in fig. 1, the second filter cavity H2 of the fourth transmitting filter branch 19 is close to the bisectrix of the housing 11 in the first direction x and the bisectrix of the housing 11 in the second direction y with respect to the first filter cavity H1 of the fourth transmitting filter branch 19, and the projection of the center of the first filter cavity H1 in the first direction x is located between the center of the second filter cavity H2 and the projection of the center of the fourth filter cavity H4 in the first direction x.

This cavity arrangement structure can prevent any one of the two rows of filter cavities of the first filter cavity H1 and the fourth emission filter branch circuit 19 from being arranged in a "straight" shape, and can reduce the arrangement space of the fourth emission filter branch circuit 19 in the second direction y.

Further, as shown in fig. 1, the ten filter cavities H1-H10 of the fourth emission filter branch 19 are all the same in size, and as can be seen from the arrangement of the filter cavities, the distances between the centers of any two adjacent filter cavities are all the same, so that the cavity array of the fourth emission filter branch 19 can be made more compact, and the arrangement space of the fourth emission filter branch 19 can be reduced; and the equidistant distribution of the filter cavities can be realized, the debugging and the layout are convenient, and the consistency is higher.

Optionally, as shown in fig. 1, inductive cross-coupling is performed between the fourth filter cavity H4 of the fourth transmit filter branch 19 and the sixth filter cavity H6 of the fourth transmit filter branch 19, and between the seventh filter cavity H7 of the fourth transmit filter branch 19 and the tenth filter cavity H10 of the fourth transmit filter branch 19, respectively, to form two inductive coupling zeros of the fourth transmit filter branch 19; capacitive cross coupling is respectively formed between the seventh filter cavity H7 of the fourth transmitting filter branch 19 and the tenth filter cavity H10 of the fourth transmitting filter branch 19, and between the third filter cavity H3 of the fourth transmitting filter branch 19 and the sixth filter cavity H6 of the fourth transmitting filter branch 19, so as to form two capacitive coupling zeros of the fourth transmitting filter branch 19.

As shown in fig. 9, a window and a metal coupling rib (equivalent to the capacitor L14 shown in fig. 9) are disposed between the fourth filter cavity H4 of the fourth transmitting filter branch 19 and the sixth filter cavity H6 of the fourth transmitting filter branch 19, and a window and a metal coupling rib (equivalent to the capacitor L15 shown in fig. 5) are disposed between the seventh filter cavity H7 of the fourth transmitting filter branch 19 and the tenth filter cavity H10 of the fourth transmitting filter branch 19; in this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is subject to a small change of the external temperature, so that the temperature drift of the fourth transmitting and filtering branch circuit 19 can be reduced.

As shown in fig. 9, a flying bar (equivalent to the capacitor C7 shown in fig. 9) is disposed between the third filter cavity H3 of the fourth transmitting filter branch 19 and the sixth filter cavity H6 of the fourth transmitting filter branch 19, and a flying bar (equivalent to the capacitor C8 shown in fig. 9) is disposed between the seventh filter cavity H7 of the fourth transmitting filter branch 19 and the tenth filter cavity H10 of the fourth transmitting filter branch 19.

In this embodiment, the inductive coupling zero is set in the fourth receiving filtering branch 18, and the capacitive coupling zero is set in the fourth transmitting filtering branch 19, so that the signal isolation between the fourth receiving filtering branch 18 and the fourth transmitting filtering branch 19 can be improved.

As shown in fig. 1, the housing 11 is further provided with a fourth port (not shown), and the first filter cavity G1 of the fourth receiving filter branch 18 and the first filter cavity H1 of the fourth transmitting filter branch 19 are both connected to the third port; the fourth receiving filtering branch 18 and the fourth transmitting filtering branch 19 share the fourth port, so that the number of ports of the filter 10 can be reduced, and the number of taps and tap welding points of the filter 10 for the ports can be reduced, thereby reducing the cost of the filter 10 and improving the flexibility of the configuration thereof.

Optionally, the first receiving filter branch 12, the second receiving filter branch 14, the third receiving filter branch 16, and the fourth receiving filter branch 18 are sequentially arranged along the first direction x, and the first receiving filter branch 12 and the second receiving filter branch 14 are disposed adjacent to each other, so that the arrangement space of the first receiving filter branch 12 and the second receiving filter branch 14 can be reduced, the second receiving filter branch 14 and the third receiving filter branch 16 are disposed at an interval, so that the signal crosstalk between the second receiving filter branch 14 and the third receiving filter branch 16 can be reduced, the third receiving filter branch 16 and the fourth receiving filter branch 19 are disposed at an interval, and the arrangement space of the third receiving filter branch 16 and the fourth receiving filter branch 19 can be reduced.

The first transmitting filter branch 13, the second transmitting filter branch 15, the third transmitting filter branch 17 and the fourth transmitting filter branch 19 are sequentially arranged at intervals along the first direction x, so that signal crosstalk among the filter branches can be reduced.

The first receiving filter branch 12 and the first transmitting filter branch 13 are arranged at intervals along the second direction y, so that signal crosstalk between the first receiving filter branch 12 and the first transmitting filter branch 13 can be reduced, the second receiving filter branch 14 and the second transmitting filter branch 15 are arranged at intervals along the second direction y, so that signal crosstalk between the second receiving filter branch 14 and the second transmitting filter branch 15 can be reduced, the third receiving filter branch 16 and the third transmitting filter branch 17 are arranged at intervals along the second direction y, so that signal crosstalk between the third receiving filter branch 16 and the third transmitting filter branch 17 can be reduced, the fourth receiving filter branch 18 and the fourth transmitting filter branch 18 are arranged at intervals along the second direction y, so that signal crosstalk between the fourth receiving filter branch 18 and the fourth transmitting filter branch 18 can be reduced.

The structure of part of a plurality of filtering branches of this embodiment is the same, can adopt same mould to produce, can simplify production technology, practices thrift the cost, improves the uniformity of signal.

In this embodiment, the first port, the second port, the third port and the fourth port are input ports.

Further, as shown in fig. 1, the housing 11 is further provided with: a first output port (not shown) connected to the eighth filter cavity A8 of the first receiving filter branch 12; a second output port (not shown) connected to the tenth filter cavity B10 of the first transmit filter branch 13; a third output port (not shown) connected to the eighth filter cavity C8 of the second receiving filter branch 14; a fourth output port (not shown) connected to the tenth filter cavity D10 of the second transmitting filter branch 15; a fifth output port (not shown) connected to the eighth filter cavity E8 of the third receiving filter branch 16; a sixth output port (not shown) connected to the tenth filter cavity F10 of the third transmitting filter branch 17; a seventh output port (not shown) connected to the eighth filter cavity G8 of the fourth receiving filter branch 18; an eighth output port (not shown) connected to the tenth filter cavity H10 of the fourth transmit filter branch 19; the port is used for filtering signal transmission; the ports may each be taps.

As shown in fig. 1, in the first receiving and filtering branch 12, the coupling bandwidth between the first port and the first filtering cavity a1 of the present embodiment is in the range of 66MHz-70 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 is in the range of 51MHz-55 MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 is in the range of 35MHz-39 MHz; the coupling bandwidth between the second filter cavity A2 and the fifth filter cavity A5 ranges from 2MHz to 6 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 is in the range of 22MHz-26 MHz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity A5 ranges from 19MHz to 23 MHz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 24MHz to 28 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 32MHz to 36 MHz; the coupling bandwidth between the sixth filtering cavity A6 and the seventh filtering cavity A7 ranges from 35MHz to 39 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 51MHz to 55 MHz; the coupling bandwidth between the eighth filter cavity A8 and the first output port is in the range of 66MHz-70MHz, which can meet the design requirement.

The resonant frequencies of the first filter cavity a1 to the eighth filter cavity A8 of the first receiving filter branch 12 are sequentially in the following ranges: 1878MHz-1980MHz, 1881MHz-1883MHz, 1899MHz-1901MHz, 1878MHz-1980 MHz.

The quality factor of the first filter branch 12 is 26.5-28.5.

Therefore, the resonant frequencies of the filter cavities are basically the same, and the convenience of manufacturing and debugging is improved; the method can be manufactured by adopting the same specification parameters, and the required parameter range can be reached only by simple debugging in the actual process.

The filtering parameters of the second receiving filtering branch 14, the third receiving filtering branch 16 and the fourth receiving filtering branch 18 are the same as those of the first receiving filtering branch 12, and are not described in detail.

As shown in fig. 1, in the first transmitting and filtering branch 13, the coupling bandwidth between the first port and the first filtering cavity B1 of the present embodiment is in the range of 65MHz-69 MHz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 50MHz to 54 MHz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 is in the range of 34MHz-38 MHz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 25MHz to 29 MHz; the coupling bandwidth between the third filter cavity B3 and the fifth filter cavity B5 is in the range of (-21) MHz- (-17) MHz; the coupling bandwidth between the third filter cavity B3 and the sixth filter cavity B6 ranges from 1MHz to 5 MHz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 21MHz to 25 MHz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 30MHz to 34 MHz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 ranges from 30MHz to 34 MHz; the coupling bandwidth between the seventh filter cavity B7 and the eighth filter cavity B8 ranges from 28MHz to 32 MHz; the coupling bandwidth between the seventh filter cavity B7 and the ninth filter cavity B9 ranges from 5MHz to 9 MHz; the coupling bandwidth between the seventh filter cavity B7 and the tenth filter cavity B10 is in the range of (-12) MHz- (-8) MHz; the coupling bandwidth between the eighth filter cavity B8 and the ninth filter cavity B9 ranges from 40MHz to 44 MHz; the coupling bandwidth between the ninth filter cavity B9 and the tenth filter cavity B10 ranges from 39MHz to 43 MHz; the coupling bandwidth between the tenth filter cavity B10 and the second output port ranges from 65MHz to 69MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity B1 to the tenth filtering cavity B10 of the second filter branch 13 are sequentially in the following ranges: 1959MHz-1961MHz, 1940MHz-1942MHz, 1957MHz-1959MHz, 1959MHz-1961MHz, 1965MHz-1967MHz, 1958MHz-1960MHz, 1959MHz-1961 MHz.

The quality factor of the first transmit filter branch 13 is 28-30.

The filtering parameters of the second transmitting and filtering branch 15 and the third transmitting and filtering branch 17 are the same as those of the first transmitting and filtering branch 13, and are not described in detail.

As shown in fig. 1, in the fourth transmitting and filtering branch 19, the coupling bandwidth between the fourth port and the first filtering cavity H1 in this embodiment is in the range of 65MHz-69 MHz; the coupling bandwidth between the first filter cavity H1 and the second filter cavity H2 ranges from 50MHz to 54 MHz; the coupling bandwidth between the second filter cavity H2 and the third filter cavity H3 is in the range of 34MHz-38 MHz; the coupling bandwidth between the third filter cavity H3 and the fourth filter cavity H4 ranges from 31MHz to 35 MHz; the coupling bandwidth between the third filter cavity H3 and the sixth filter cavity H6 ranges from 1MHz to 5 MHz; the coupling bandwidth between the fourth filter cavity H4 and the fifth filter cavity H5 ranges from 21MHz to 25 MHz; the coupling bandwidth between the fourth filter cavity H4 and the sixth filter cavity H6 is in the range of (-20) MHz- (-16) MHz; the coupling bandwidth between the fifth filter cavity H5 and the sixth filter cavity H6 ranges from 23MHz to 27 MHz; the coupling bandwidth between the sixth filtering cavity H6 and the seventh filtering cavity H7 ranges from 29MHz to 33 MHz; the coupling bandwidth between the seventh filter cavity H7 and the eighth filter cavity H8 ranges from 28MHz to 32 MHz; the coupling bandwidth between the seventh filter cavity H7 and the tenth filter cavity H10 is in the range of (-12) MHz- (-8) MHz; the coupling bandwidth between the eighth filter cavity H8 and the ninth filter cavity H9 ranges from 39MHz to 43 MHz; the coupling bandwidth between the eighth filtering cavity H8 and the tenth filtering cavity H10 ranges from 9MHz to 13 MHz; the coupling bandwidth between the ninth filter cavity H9 and the tenth filter cavity H10 ranges from 48MHz to 52 MHz; the coupling bandwidth between the tenth filter cavity H10 and the eighth output port ranges from 65MHz to 69MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity H1 to the tenth filtering cavity H10 of the fourth transmitting filtering branch 19 are sequentially in the following ranges: 1959MHz-1961MHz, 1957MHz-1959MHz, 1941MHz-1943MHz, 1959MHz-1961MHz, 1956MHz-1958MHz, 1967MHz-1969MHz, 1959MHz-1961 MHz.

The quality factor of the fourth transmit filter branch 19 is 28-30.

In this embodiment, the first receiving filter branch 12, the second receiving filter branch 14, the third receiving filter branch 16, and the fourth receiving filter branch 18 are receiving filter branches, and the first transmitting filter branch 13, the second transmitting filter branch 15, the third transmitting filter branch 17, and the fourth transmitting filter branch 19 are transmitting filter branches.

As shown in fig. 10 and fig. 11, the bandwidth of the receiving filter branch is in the range of 1849MHz to 1911MHz, and as shown in the frequency band curve S1 in fig. 10, the coupling zeros of the receiving filter branch include a and b; the bandwidth of the transmitting and filtering branch is in the range of 1929MHz-1991MHz, as shown in a frequency band curve S2 in fig. 11, the coupling zero of the transmitting and filtering branch includes c, d, e; the coupling zeros make the bandwidth rejection of 1850.5MHz-1885.5MHz less than or equal to 113dB, the bandwidth rejection of 1885.5MHz-1910.5MHz less than or equal to 105dB, the bandwidth rejection of 1910.5MHz-1920.5MHz less than or equal to 17dB, the bandwidth rejection of 1920.5MHz-1925MHz less than or equal to 2dB, the bandwidth rejection of 1995MHz-1999.5MHz less than or equal to 3dB, the bandwidth rejection of 1997.5MHz-2009.5MHz less than or equal to 19dB, the bandwidth rejection of 2009.5MHz-5054.5MHz less than or equal to 47dB, the bandwidth rejection of 5054.5MHz-2109.5MHz less than or equal to 52dB, the bandwidth rejection of 2109.5MHz-2299.5MHz less than or equal to 74dB, the bandwidth rejection of 1MHz-1601MHz less than or equal to 80dB, the bandwidth rejection of 1601MHz-1803MHz less than or equal to 51dB, the bandwidth rejection of 1803MHz-1831MHz is less than or equal to 26dB, the bandwidth rejection of 1929MHz-1949MHz is less than or equal to 80dB, the bandwidth rejection of 149MHz-2031MHz is less than or equal to 85dB, the bandwidth rejection of 2031MHz-2690MHz is less than or equal to 70dB, the bandwidth rejection of 2690MHz-3800MHz is less than or equal to 60dB, and the performance of filtering branches such as out-of-band rejection can be realized.

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.

Some embodiments of the present application are referred to as filters, and may also be referred to as duplexers or combiners.

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 of the present embodiment includes an antenna 32 and a radio frequency unit 31 connected to the antenna 32, the radio frequency unit 31 includes a filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering a radio frequency signal.

In other embodiments, the rf Unit 31 may be integrated with the Antenna 32 to form an Active Antenna Unit (AAU).

Different from the prior art, the filter of the embodiment of the application comprises: the device comprises a shell, a first connecting piece and a second connecting piece, wherein the shell is provided with a first direction and a second direction which are perpendicular to each other; the first receiving filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a first coupling path, and two coupling zeros of the first receiving filtering branch are formed; the second receiving filter branch is arranged on the shell and consists of eight filter cavities which are sequentially coupled along a third coupling path, and two coupling zeros of the second receiving filter branch are formed; the first transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and four coupling zeros of the first transmitting and filtering branch are formed; the second transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a fourth coupling path, and four coupling zeros of the second transmitting and filtering branch are formed; the first receiving filter branch and the second receiving filter branch are arranged along a first direction, the first transmitting filter branch and the second transmitting filter branch are arranged along the first direction, the first receiving filter branch and the first transmitting filter branch are arranged along a second direction, and the second receiving filter branch and the second transmitting filter branch are arranged along the second direction; the first filtering cavity of the first receiving filtering branch and the first filtering cavity of the first transmitting filtering branch are both connected with the first port, and the first filtering cavity of the second receiving filtering branch and the first filtering cavity of the second transmitting filtering branch are both connected with the second port. In this way, the two receiving filtering branches are arranged along the first direction of the shell, the two transmitting filtering branches are arranged along the first direction of the shell, but the receiving filtering branches and the transmitting filtering branches are arranged along the second direction of the shell, so that the length of the filter in a certain direction can be prevented from being too long, the size of the filter is reduced, the whole filter is relatively square, and the design requirement of miniaturization is met; in addition, the first receiving filter branch and the first transmitting filter branch of the filter share the first port, and the second receiving filter branch and the second transmitting filter branch share the second port, so that the number of ports of the filter can be reduced, the number of taps of the filter for the ports and the number of tap welding points can be reduced, and the cost of the filter can be reduced.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

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

the device comprises a shell, a first connecting piece and a second connecting piece, wherein the shell is provided with a first direction and a second direction which are perpendicular to each other;

the first receiving filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a first coupling path, and two coupling zeros of the first receiving filtering branch are formed;

the second receiving filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a third coupling path, and two coupling zeros of the second receiving filtering branch are formed;

the first transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and four coupling zeros of the first transmitting and filtering branch are formed;

the second transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a fourth coupling path, and four coupling zeros of the second transmitting and filtering branch are formed;

wherein the first receiving filter branch and the second receiving filter branch are arranged along the first direction, the first transmitting filter branch and the second transmitting filter branch are arranged along the first direction, the first receiving filter branch and the first transmitting filter branch are arranged along the second direction, and the second receiving filter branch and the second transmitting filter branch are arranged along the second direction; the first filtering cavity of the first receiving filtering branch and the first filtering cavity of the first transmitting filtering branch are both connected with the first port, and the first filtering cavity of the second receiving filtering branch and the first filtering cavity of the second transmitting filtering branch are both connected with the second port.

2. The filter of claim 1, wherein the eight filter cavities of the first receiving filter branch are arranged adjacently in sequence along the first coupling path;

the first filtering cavity, the second filtering cavity, the fifth filtering cavity and the sixth filtering cavity of the first receiving filtering branch are arranged in a diamond shape, the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the first receiving filtering branch are arranged in a diamond shape, and the first filtering cavity, the second filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the first receiving filtering branch are arranged in a diamond shape;

the projections of a first filter cavity, a second filter cavity and a third filter cavity of the first receiving filter branch in the first direction are overlapped, and the projections of a fourth filter cavity, a fifth filter cavity, a sixth filter cavity and a seventh filter cavity of the first receiving filter branch in the first direction are overlapped;

the eighth filter cavity of the first receiving filter branch is close to the middle branching line of the shell in the first direction and the middle branching line of the shell in the second direction relative to the seventh filter cavity of the first receiving filter branch, and the projection of the center of the seventh filter cavity of the first receiving filter branch in the first direction is located between the projection of the center of the first filter cavity of the first receiving filter branch and the projection of the center of the eighth filter cavity of the first receiving filter branch in the first direction;

and the second filter cavity of the first receiving filter branch circuit and the fifth filter cavity of the first receiving filter branch circuit, and the third filter cavity of the first receiving filter branch circuit and the fifth filter cavity of the first receiving filter branch circuit are inductively cross-coupled to form two inductive cross-couplings of the first receiving filter branch circuit.

3. The filter according to claim 2, wherein the ten filter cavities of the first transmitting filter branch and the first transmitting filter branch are arranged adjacently in sequence along the second coupling path;

the second filter cavity, the third filter cavity, the fourth filter cavity and the fifth filter cavity of the first transmitting filter branch are arranged in a rhombus shape, the third filter cavity, the fourth filter cavity, the fifth filter cavity and the sixth filter cavity of the first transmitting filter branch are arranged in a rhombus shape, the fifth filter cavity, the sixth filter cavity, the seventh filter cavity and the eighth filter cavity of the first transmitting filter branch are arranged in a rhombus shape, and the seventh filter cavity, the eighth filter cavity, the ninth filter cavity and the tenth filter cavity of the first transmitting filter branch are arranged in a rhombus shape;

the projections of a second filter cavity, a third filter cavity, a sixth filter cavity, a seventh filter cavity and a tenth filter cavity of the first emission filter branch in the first direction are overlapped, and the projections of a fourth filter cavity, a fifth filter cavity, an eighth filter cavity and a ninth filter cavity of the first emission filter branch in the first direction are overlapped;

the second filter cavity of the first transmitting filter branch is close to the middle branching line of the shell in the first direction and the middle branching line of the shell in the second direction relative to the first filter cavity of the first transmitting filter branch;

the third filter cavity of the first transmit filter branch is inductively cross-coupled with the fifth filter cavity of the first transmit filter branch, the seventh filter cavity of the first transmit filter branch is inductively cross-coupled with the tenth filter cavity of the first transmit filter branch, so as to form two inductive cross-couplings of the first transmit filter branch, the third filter cavity of the first transmit filter branch is capacitively cross-coupled with the sixth filter cavity of the first transmit filter branch, and the seventh filter cavity of the first transmit filter branch is capacitively cross-coupled with the ninth filter cavity of the first transmit filter branch, so as to form two capacitive cross-couplings of the first transmit filter branch.

4. The filter according to claim 3, wherein the eight filter cavities of the second receiving filter branch are arranged adjacently in sequence along the third coupling path; the first filtering cavity, the second filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the second receiving filtering branch are arranged in a diamond shape, the first filtering cavity, the second filtering cavity, the fifth filtering cavity and the sixth filtering cavity of the second receiving filtering branch are arranged in a diamond shape, and the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the second receiving filtering branch are arranged in a diamond shape; the projections of a first filter cavity, a second filter cavity and a third filter cavity of the second receiving filter branch in the first direction are overlapped, and the projections of a fourth filter cavity, a fifth filter cavity, a sixth filter cavity and a seventh filter cavity of the second receiving filter branch in the first direction are overlapped;

the eighth filter cavity of the second receiving filter branch is close to the midline of the housing in the first direction and the midline of the housing in the second direction relative to the seventh filter cavity of the second receiving filter branch, and the projection of the center of the eighth filter cavity of the second receiving filter branch in the first direction is located between the projection of the center of the first filter cavity of the second receiving filter branch and the projection of the center of the seventh filter cavity of the second receiving filter branch in the first direction;

the coupling zero distribution of the second receiving filter branch is the same as that of the first receiving filter branch.

5. The filter of claim 4,

the structures of a third filtering cavity to a tenth filtering cavity of the second emission filtering branch are the same as the structures of the third filtering cavity to the tenth filtering cavity of the first emission filtering branch;

the second filter cavity of the second transmitting filter branch is also arranged adjacent to the first filter cavity and the second filter cavity of the second transmitting filter branch, the second filter cavity of the second transmitting filter branch is divided into a middle line of the housing in the first direction relative to the third filter cavity of the second transmitting filter branch, and the projection of the second filter cavity of the second transmitting filter branch in the second direction is located between the center of the first filter cavity of the second transmitting filter branch and the projection of the center of the third filter cavity of the second transmitting filter branch in the second direction;

and the third filter cavity of the second transmitting filter branch and the fifth filter cavity of the second transmitting filter branch, the seventh filter cavity of the second transmitting filter branch and the tenth filter cavity of the second transmitting filter branch are respectively in capacitive cross coupling to form two capacitive cross couplings of the second transmitting filter branch, and the third filter cavity of the second transmitting filter branch and the sixth filter cavity of the second transmitting filter branch, and the seventh filter cavity of the second transmitting filter branch and the ninth filter cavity of the second transmitting filter branch are respectively in inductive cross coupling to form two inductive cross couplings of the second transmitting filter branch.

6. The filter of claim 5, wherein a third port is provided on the housing, the filter further comprising:

the third receiving and filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a fifth coupling path, and two inductive coupling zeros of the third receiving and filtering branch are formed;

the structure of the third receiving filter branch is the same as that of the second receiving filter branch; the first filtering cavity of the third receiving filtering branch circuit is connected with the third port;

the third transmitting and filtering branch is arranged on the shell and consists of ten filtering cavities which are sequentially coupled along a sixth coupling path, and four coupling zeros of the third transmitting and filtering branch are formed; the first filtering cavity of the third transmitting filtering branch circuit is connected with the third port;

the structures of a third filtering cavity to a tenth filtering cavity of the third emission filtering branch circuit are the same as the structures of the third filtering cavity to the tenth filtering cavity of the second emission filtering branch circuit;

the second filtering cavity of the third transmitting and filtering branch circuit is adjacent to the first filtering cavity and the third filtering cavity of the third transmitting and filtering branch circuit respectively, the second filtering cavity and the first filtering cavity of the third transmitting and filtering branch circuit are in projection superposition in the first direction, and the third filtering cavity of the third transmitting and filtering branch circuit is opposite to the second filtering cavity of the third transmitting and filtering branch circuit and is close to the middle branch line in the first direction.

7. The filter of claim 6, further comprising:

the fourth receiving and filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled along a seventh coupling path, and two inductive coupling zeros of the fourth receiving and filtering branch are formed;

the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the fourth receiving filtering branch are sequentially adjacent and arranged in a regular hexagon, the first filtering cavity and the second filtering cavity of the fourth receiving filtering branch are positioned on the same side of the regular hexagon, and the projections of the first filtering cavity and the second filtering cavity in the first direction are overlapped;

the fifth filtering cavity of the fourth receiving filtering branch is positioned in the center of the regular hexagon and is respectively adjacent to the first filtering cavity, the second filtering cavity, the third filtering cavity, the fourth filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the fourth receiving filtering branch;

a projection of the eighth filter cavity of the fourth receiving filter branch and a projection of the sixth filter cavity of the fourth receiving filter branch in the first direction are overlapped, and a projection of the center of the seventh filter cavity of the fourth receiving filter branch in the second direction is located between the center of the eighth filter cavity of the fourth receiving filter branch and the projection of the center of the sixth filter cavity of the fourth receiving filter branch in the second direction;

the coupling zero distribution of the fourth receiving filter branch is the same as that of the first receiving filter branch.

8. The filter according to claim 7, wherein the housing further has a fourth port, the filter further includes a fourth transmitting filter branch, the fourth transmitting filter branch is disposed on the housing, the fourth transmitting filter branch is composed of ten filter cavities sequentially coupled along an eighth coupling path, and forms four coupling zeros of the fourth transmitting filter branch; the first filter cavity of the fourth receiving filter branch and the first filter cavity of the fourth transmitting filter branch are both connected with the fourth port;

ten filter cavities of the fourth transmitting filter branch circuit are sequentially and adjacently arranged along the eighth coupling path; the third filter cavity, the fourth filter cavity, the fifth filter cavity and the sixth filter cavity of the fourth transmitting filter branch are arranged in a diamond shape, the fifth filter cavity, the sixth filter cavity, the seventh filter cavity and the eighth filter cavity of the fourth transmitting filter branch are arranged in a diamond shape, and the seventh filter cavity, the eighth filter cavity, the ninth filter cavity and the tenth filter cavity of the fourth transmitting filter branch are arranged in a diamond shape; the projections of a second filter cavity, a third filter cavity, a sixth filter cavity, a seventh filter cavity and a tenth filter cavity of the fourth emission filter branch in the first direction are overlapped, and the projections of a fourth filter cavity, a fifth filter cavity, an eighth filter cavity and a ninth filter cavity of the fourth emission filter branch in the first direction are overlapped; the second filter cavity of the fourth transmitting filter branch is close to the middle branching line of the shell in the first direction and the middle branching line of the shell in the second direction relative to the first filter cavity of the fourth transmitting filter branch;

and the fourth filter cavity of the fourth transmitting filter branch and the sixth filter cavity of the fourth transmitting filter branch, the seventh filter cavity of the fourth transmitting filter branch and the tenth filter cavity of the fourth transmitting filter branch are inductively cross-coupled to form two inductive cross-couplings of the fourth transmitting filter branch, the third filter cavity of the fourth transmitting filter branch and the sixth filter cavity of the fourth transmitting filter branch, and the eighth filter cavity of the fourth transmitting filter branch and the tenth filter cavity of the fourth transmitting filter branch are capacitively cross-coupled to form two capacitive cross-couplings of the fourth transmitting filter branch.

9. The filter according to claim 8, wherein the first receiving filter branch, the second receiving filter branch, the third receiving filter branch and the fourth receiving filter branch are arranged in sequence along the first direction, and the first receiving filter branch is disposed adjacent to the second receiving filter branch, the second receiving filter branch is disposed at an interval from the third receiving filter branch, and the third receiving filter branch is disposed at an interval from the fourth receiving filter branch;

the first transmitting filter branch, the second transmitting filter branch, the third transmitting filter branch and the fourth transmitting filter branch are sequentially arranged at intervals along the first direction;

the first receiving filter branch and the first transmitting filter branch are arranged at intervals along the second direction, the second receiving filter branch and the second transmitting filter branch are arranged at intervals along the second direction, the third receiving filter branch and the third transmitting filter branch are arranged at intervals along the second direction, and the fourth receiving filter branch and the fourth transmitting filter branch are arranged at intervals along the second direction.

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