CN113131154A

CN113131154A - Filter and communication equipment

Info

Publication number: CN113131154A
Application number: CN201911418122.1A
Authority: CN
Inventors: 李华; 王磊; 周峰; 刘学鑫
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16

Abstract

The application discloses a filter and communication equipment. The filter includes: a housing having a first direction and a second direction perpendicular to each other; a first common chamber disposed on the housing; the first filtering branch circuit is coupled with the first common cavity, consists of eight filtering cavities which are sequentially coupled along a first coupling path, and forms three coupling zeros of the first filtering branch circuit; the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled along a second coupling path, and forms three coupling zeros of the second filtering branch; the first common cavity is coupled with the first filter cavity of the first filter branch and the first filter cavity of the second filter branch respectively, and the eight filter cavities of the first filter branch and the seven filter cavities of the second filter branch are divided into three rows arranged along the first direction. By the mode, the size of the filter can be reduced, the number of taps and welding points is reduced, the production process is simplified, and the cost is saved.

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 of the existing filter and the number of taps are increased along with the increase of the filter branches in long-term research and development work, so that the number of taps and the number of welding points are large, and the cost is high.

Disclosure of Invention

The application provides a filter and communication equipment, so as to reduce the size of the filter, reduce the number of taps and welding points, simplify the production process and save the cost.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes: a housing having a first direction and a second direction perpendicular to each other; a first common chamber disposed on the housing; the first filtering branch circuit is coupled with the first common cavity, consists of eight filtering cavities which are sequentially coupled along a first coupling path, and forms three coupling zeros of the first filtering branch circuit; the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled along a second coupling path, and forms three coupling zeros of the second filtering branch; the first common cavity is coupled with the first filter cavity of the first filter branch and the first filter cavity of the second filter branch respectively, and the eight filter cavities of the first filter branch and the seven filter cavities of the second filter branch are divided into three rows arranged along the first direction.

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: a housing having a first direction and a second direction perpendicular to each other; a first common chamber disposed on the housing; the first filtering branch circuit is coupled with the first common cavity, consists of eight filtering cavities which are sequentially coupled along a first coupling path, and forms three coupling zeros of the first filtering branch circuit; the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled along a second coupling path, and forms three coupling zeros of the second filtering branch; the first common cavity is coupled with the first filter cavity of the first filter branch and the first filter cavity of the second filter branch respectively, and the eight filter cavities of the first filter branch and the seven filter cavities of the second filter branch are divided into three rows arranged along the first direction. The first filtering branch and the second filtering branch of the filter share the common cavity, so that the size of the filter can be reduced, the first filtering branch and the second filtering branch can be connected with the common port through the common cavity, and the ports do not need to be arranged for the first filtering branch and the second filtering branch respectively, therefore, the number of taps and tap welding points can be reduced, the cost of the filter can be reduced, and the configuration flexibility of the filter can be improved; meanwhile, the first filtering branch and the second filtering branch are regular in cavity arrangement, so that the production process can be simplified, and the cost is saved.

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 filtering branch in an embodiment of a filter according to the present application;

FIG. 3 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application;

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

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

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

FIG. 7 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application;

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

FIG. 9 is a diagram illustrating simulation results of an embodiment of the 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 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 filtering branch in an embodiment of a filter according to the present application; FIG. 3 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application; FIG. 4 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application; FIG. 5 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of the filter of the present application; FIG. 6 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application; FIG. 7 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application; FIG. 8 is a schematic diagram of a topology of a seventh filtering branch in an embodiment of the filter of the present application; FIG. 9 is a diagram illustrating simulation results of an embodiment of the 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 filter comprises a shell 11, a first filtering branch 12, a second filtering branch 13 and a first common cavity ABC, wherein the shell 11 has a first direction x and a second direction y which are perpendicular to each other; the first common cavity ABC is disposed on the housing 11; the first filtering branch 12 is arranged on the shell 11, the first filtering branch 12 is coupled with the first common cavity ABC, the first filtering branch 12 is composed of eight filtering cavities a1-A8 which are sequentially coupled along a first coupling path, and the eight filtering cavities a1-A8 form three coupling zeros of the first filtering branch 12; the second filtering branch 13 is arranged on the shell 11, the second filtering branch 13 is coupled with the first common cavity ABC, the second filtering branch 13 is composed of seven filtering cavities B1-B7 which are sequentially coupled along a second coupling path, and the seven filtering cavities B1-B7 of the second filtering branch 13 form three coupling zeros of the second filtering branch 13; wherein, the first common cavity ABC is respectively coupled with the first filter cavity a1 of the first filter branch 12 and the first filter cavity B1 of the second filter branch 13; and the eight filter cavities a1-A8 of the first filter branch 12 and the seven filter cavities B1-B7 of the second filter branch 13 are divided into three columns arranged along the first direction x.

As shown in fig. 1, the eight filter cavities a1-A8 of the first 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 seven filter cavities B1-B7 of the second 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 and a seventh filter cavity B7.

Different from the prior art, the first filtering branch 12 and the second filtering branch 13 of the filter 10 of this embodiment share the first common cavity ABC, so that the size of the filter 10 can be reduced, and the first filtering branch 12 and the second filtering branch 13 can be connected to the common port through the first common cavity ABC without respectively providing ports for the first filtering branch 12 and the second filtering branch 13, thereby reducing the number of taps and tap welding points, reducing the cost of the filter 10, and improving the configuration flexibility thereof; and the eight filter cavities a1-A8 of the first filter branch 12 and the seven filter cavities B1-B7 of the second filter branch 13 are divided into three rows arranged along the first direction x, and the arrangement is regular, so that the size of the filter 10 can be reduced, the production process can be simplified, and the cost can be saved.

And a plurality of 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.

Optionally, as shown in fig. 1, the first filter cavity B1 of the second filter branch 13 is in a row with the first filter cavity a1, the second filter cavity a2, the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 12 and is arranged adjacently in sequence along the second direction x; the second filtering cavity B2, the third filtering cavity B3 and the sixth filtering cavity B6 of the second filtering branch 13 are in a row with the third filtering cavity A3, the seventh filtering cavity a7 and the sixth filtering cavity a6 of the first filtering branch 12 and are sequentially and adjacently arranged along the second direction x; the fourth filtering cavity B4, the fifth filtering cavity B5 and the seventh filtering cavity B7 of the second filtering branch 13 are in a row with the eighth filtering cavity a8 of the first filtering branch 12 and are sequentially arranged along the second direction, and the fourth filtering cavity B4, the fifth filtering cavity B5 and the seventh filtering cavity B7 of the second filtering branch 13 are sequentially and adjacently arranged.

The third filtering cavity B3 of the second filtering branch 12 is further respectively adjacent to the first filtering cavity B1, the fourth filtering cavity B4, the fifth filtering cavity B5 of the second filtering branch 12, and the first filtering cavity a1 of the first filtering branch 12, the third filtering cavity A3 of the first filtering branch 12 is further respectively adjacent to the seventh filtering cavity B7 of the second filtering branch 12, the second filtering cavity a2 of the first filtering branch 12, and the fourth filtering cavity a4, and the eighth filtering cavity A8 of the first filtering branch 12 is further respectively adjacent to the seventh filtering cavity a7 and the sixth filtering cavity A6 of the first filtering branch 12.

From the above analysis, it can be known that the eight filter cavities a1-A8 of the first filter branch 12 and the seven filter cavities B1-B7 of the second filter branch 13 are arranged in three rows, and the three rows of filter cavities are adjacently disposed, and the plurality of filter cavities in each row are sequentially adjacently disposed, and the two rows of filter cavities are alternately disposed, so that the arrangement space of the first filter branch 12 and the second filter branch 13 can be reduced.

Optionally, inductive cross-coupling is respectively performed between the second filter cavity a2 of the first filter branch 12 and the fourth filter cavity a4 of the first filter branch 12, between the fourth filter cavity a4 of the first filter branch 12 and the seventh filter cavity a7 of the first filter branch 12, and between the fifth filter cavity a5 of the first filter branch 12 and the seventh filter cavity a7 of the first filter branch 12, so as to form three inductive coupling zeros of the first 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. As shown in fig. 2, that is, windows and coupling ribs (not shown, shown by dashed lines) are respectively disposed between the second filter cavity a2 and the fourth filter cavity a4, between the fourth filter cavity a4 and the seventh filter cavity a7, and between the fifth filter cavity a5 and the seventh filter cavity a 7; in the embodiment, the inductive cross coupling is realized through the metal coupling rib, and the metal coupling rib is slightly changed by the external temperature, so that the temperature drift of the first filtering branch 12 can be reduced; and the coupling zero points of the first filtering branch 12 are all inductive coupling zero points, so that the consistency of materials can be improved, the process is simplified, and the cost is saved.

Optionally, inductive cross coupling is respectively performed between the first filter cavity B1 of the second filter branch 13 and the third filter cavity B3 of the second filter branch 13, and between the third filter cavity B3 of the second filter branch 13 and the sixth filter cavity B6 of the second filter branch 13, so as to form two inductive coupling zeros of the second filter branch 13, and capacitive cross coupling is performed between the third filter cavity B3 of the second filter branch 13 and the fifth filter cavity B5 of the second filter branch 13, so as to form one capacitive coupling zero of the second filter branch 13.

As shown in fig. 3, a window and a coupling rib (not shown, shown by a dotted line) may be respectively disposed between the first filter cavity B1 and the third filter cavity B3, and between the third filter cavity B3 and the sixth filter cavity B6 of the second filter branch 13; 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 second 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. That is, the third filter chamber B3 and the fifth filter chamber B5 are provided with flying bars (not shown, shown by dotted lines).

Optionally, as shown in fig. 1, the filter 10 further includes: the third filtering branch 14 is composed of five filtering cavities C1-C5 coupled in sequence along the third coupling path, and forms a coupling zero point of the third filtering branch 14.

Wherein, the five filter cavities C1-C5 of the third filter branch 14 include: a first filter chamber C1, a second filter chamber C2, a third filter chamber C3, a fourth filter chamber C4 and a fifth filter chamber C5.

The first filtering cavity C1 of the third filtering branch 14 is coupled to the first common cavity ABC, and can share the first common cavity ABC and the port with the first filtering branch 12 and the second filtering branch 13, so that the size of the filter 10 can be reduced, the number of taps and tap welding points can be reduced, and the cost of the filter 10 can be reduced.

The second filtering cavity C2 to the fifth filtering cavity C5 of the third filtering branch 14 are sequentially and adjacently arranged in a shape of a straight line along the second direction y; the first filtering cavity C1, the second filtering cavity C2 and the third filtering cavity C3 of the third filtering branch 14 are adjacent and arranged in a triangle, and the projection of the first filtering cavity C1 of the third filtering branch 14 in the first direction x is located between the projection of the second filtering cavity C2 and the first common cavity ABC of the third filtering branch 14 in the first direction x. The adjacent space of arranging that can reduce that sets up, the cavity structure of the aforesaid row can avoid first filtering chamber C1 and second filtering chamber C2 to fifth filtering chamber C5 to become a row and arrange, can reduce the space of arranging of third filtering branch road 14 along second direction y.

The first filter cavity C1 of the third filter branch 14 is capacitively cross-coupled with the third filter cavity C3 of the third filter branch 14, so as to form a capacitive coupling zero point of the third filter branch 14.

As shown in fig. 4, a flying bar (not shown, shown in phantom) may be provided between the first filter cavity C1 and the third filter branch 14.

Optionally, as shown in fig. 1, the filter 10 further includes: a fourth filtering branch 15, the fourth filtering branch 15 being composed of five filtering cavities D1-D5 coupled in sequence along a fourth coupling path.

Wherein, the five filter cavities D1-D5 of the fourth filter branch 15 include: a first filter cavity D1, a second filter cavity D2, a third filter cavity D3, a fourth filter cavity D4 and a fifth filter cavity D5.

The four filter cavities D1-D4 of the fourth filter branch 15 are sequentially arranged in a straight shape along the second direction y; the projection of the fifth filter cavity D5 of the fourth filter branch 15 in the first direction x is located between the first common cavity ABC and the projection of the first filter cavity D1 of the fourth filter branch 15 in the first direction x, and the projection of the first common cavity ABC in the second direction y is located between the projection of the fifth filter cavity D5 of the fourth filter branch 15 and the projection of the first filter cavity D1 of the fourth filter branch 15 in the second direction y. The first common cavity ABC, the fifth filtering cavity D5 and the four filtering cavities D1-D4 can be prevented from being arranged in a shape of a sub-line, and the arrangement space of the fourth filtering branch 15 in the second direction y is reduced.

The four filter cavities D1-D4 of the fourth filter branch 15 are regularly arranged, so that the arrangement space can be reduced; and the fourth filtering branch 15 has no cross coupling, adopts pure window coupling, has good consistency of window coupling, is low in cost, and does not need to arrange other materials (such as inductive cross coupling materials).

The fifth filter cavity D5 of the fourth filter branch 15 is coupled to the first common cavity ABC.

The fourth filtering branch 15, the first filtering branch 12, the second filtering branch 13 and the third filtering branch 14 share the first common cavity ABC and the port, so that the size of the filter 10 can be reduced, the number of taps and tap welding points can be reduced, and the cost of the filter 10 is reduced.

Optionally, as shown in fig. 1, the filter cavity 10 further includes: the fifth filter branch 16 is composed of four filter cavities E1-E4 coupled in sequence along the fifth coupling path, and forms a coupling zero of the fifth filter branch 16.

Wherein the four filter cavities E1-E4 of the fifth filter branch 16 include: a first filter cavity E1, a second filter cavity E2, a third filter cavity E3 and a fourth filter cavity E4.

Wherein, the four filter cavities of the fifth filter branch 16 are arranged adjacently in a line shape along the second direction y; the four filter cavities E1-E4 of the fifth filter branch 16 are arranged adjacently and regularly, so that the arrangement space can be reduced.

The first filter cavity E1 and the third filter cavity E3 of the fifth filter branch 16 are capacitively cross-coupled to form a capacitive coupling zero of the fifth filter branch 16.

As shown in fig. 5, a flying rod (not shown, shown in phantom) may be positioned between first filter chamber E1 and third filter chamber E3.

Optionally, as shown in fig. 1, the filter cavity 10 further includes: and a second common cavity DE disposed on the housing 11 and respectively coupled to the first filter cavity D1 of the fourth filter branch 15 and the first filter cavity E1 of the fifth filter branch 16.

The fifth filtering branch 16 and the fourth filtering branch 15 share the second common cavity DE and the port, so that the size of the filter 10 can be reduced, the number of taps and tap welding points can be reduced, and the cost of the filter 10 is reduced.

Optionally, as shown in fig. 1, the filter 10 further includes: a third common chamber C-G, provided on the housing 11, is coupled to the second common chamber DE and to the fifth filter chamber C5 of the third filter branch 14, respectively.

The second common cavity DE and the third filtering branch 14 share the third common cavity C-G and the port, so that the size of the filter 10 can be reduced, the number of taps and tap welding points can be reduced, and the cost of the filter 10 is reduced.

Optionally, as shown in fig. 1, the filter cavity 10 further includes: the sixth filtering branch 17 is composed of seven filtering cavities F1-F7 coupled in sequence along the sixth coupling path, and forms two coupling zeros of the sixth filtering branch 17.

Wherein, the seven filter cavities F1-F7 of the sixth filter branch 17 include: a first filter cavity F1, a second filter cavity F2, a third filter cavity F3, a fourth filter cavity F4, a fifth filter cavity F4, a sixth filter cavity F6 and a seventh filter cavity F7.

Seven filter cavities F1-F7 of the sixth filter branch 17 are sequentially and adjacently arranged along a sixth coupling path, a second filter cavity F2, a third filter cavity F3, a sixth filter cavity F6 and a seventh filter cavity F7 of the sixth filter branch 17 are arranged in a diamond shape, a third filter cavity F3, a sixth filter cavity F6, a fourth filter cavity F4 and a fifth filter cavity F5 of the sixth filter branch 17 are arranged in a diamond shape, and a third filter cavity F3, a fourth filter cavity F4, a sixth filter cavity F6 and a seventh filter cavity F7 of the sixth filter branch 17 are arranged in a diamond shape; the first filter cavity F1 of the sixth filter branch 17 overlaps the projection of the second filter cavity F2 of the sixth filter branch 17 in the first direction x, and the projection of the first filter cavity F1 of the sixth filter branch 17 in the first direction x is located between the projection of the seventh filter cavity F7 and the third common cavity C-G of the sixth filter branch 17 in the first direction x.

Seven filter cavities F1-F7 of the sixth filter branch 17 are adjacently arranged in two rows in a staggered manner, and each row of filter cavities are sequentially arranged adjacently, so that the arrangement space of the sixth filter branch 17 can be reduced; in addition, the cavity arrangement structure avoids the third common cavity C-G and the two rows of filter cavities being arranged in the same row, and the arrangement space of the sixth filter branch 17 in the second direction can be reduced.

Inductive coupling is respectively performed between the third filter cavity F3 of the sixth filter branch 17 and the sixth filter cavity F6 of the sixth filter branch 17, and between the fourth filter cavity F4 of the sixth filter branch 17 and the sixth filter cavity F6 of the sixth filter branch 17, so as to form two inductive coupling zeros of the sixth filter branch 17.

As shown in fig. 7, windows and coupling ribs (not shown, shown by dotted lines) may be respectively disposed between the third filter cavity F3 and the sixth filter cavity F6, and between the fourth filter cavity F4 and the sixth filter cavity F6; 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 sixth filtering branch 17 can be reduced; and the zero points of the sixth filtering branch 17 are all inductive coupling zero points, so that the material consistency can be improved, the production process is simplified, and the cost is saved.

Optionally, as shown in fig. 1, the filter 10 further includes: the seventh filtering branch 18 is composed of six filtering cavities G1-G6 coupled in sequence along a seventh coupling path, and forms two coupling zeros of the seventh filtering branch 18.

Wherein the six filter cavities G1-G6 of the seventh 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 G4 and a sixth filter cavity G6.

The six filter cavities G1-G6 of the seventh filter branch 18 are sequentially and adjacently arranged along a seventh coupling path, the first filter cavity G1, the second filter cavity G2, the fifth filter cavity G5 and the sixth filter cavity G6 of the seventh filter branch 18 are arranged in a diamond shape, and the second filter cavity G2, the third filter cavity G3, the fourth filter cavity G4 and the fifth filter cavity G5 of the seventh filter branch 18 are arranged in a diamond shape; the second filtering cavity G2 of the seventh filtering branch 18 is further disposed adjacent to the fifth filtering cavity G5 and the sixth filtering cavity G6 of the seventh filtering branch 18, respectively, projections of the first filtering cavity G1 to the third filtering cavity G3 of the seventh filtering branch 18 in the second direction y overlap, projections of the fourth filtering cavity G4 to the sixth filtering cavity G6 of the seventh filtering branch 18 in the second direction y overlap, and a projection of the third common cavity C-G in the second direction y is located between the first filtering cavity G1 of the seventh filtering branch 18 and the sixth filtering cavity G6 of the seventh filtering branch 18.

The six filter cavities G1-G6 of the seventh filter branch 18 are arranged in two rows in an adjacent staggered manner, and each row of filter cavities are arranged in sequence and adjacently, so that the arrangement space of the seventh filter branch 18 can be realized; and the cavity arrangement structure avoids the third common cavity C-G and the two filter cavities being arranged in the same row, and the arrangement space of the seventh filter branch 18 in the first direction can be reduced.

The second filter cavity G2 of the seventh filter branch 18 is inductively coupled with the fifth filter cavity G5 of the seventh filter branch 18 to form an inductive coupling zero point of the seventh filter branch 18, and the third filter cavity G3 of the seventh filter branch 18 is capacitively coupled with the fifth filter cavity G5 of the seventh filter branch 18 to form an inductive coupling zero point of the seventh filter branch 18.

As shown in fig. 8, a window and a coupling rib (not shown, shown by a dotted line) may be respectively disposed between the second filter chamber G2 and the fifth filter chamber G5; 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 sixth filtering branch 17 can be reduced; a fly rod (not shown, shown in phantom) may be disposed between third filter chamber G3 and fifth filter chamber G5.

Wherein the first filter cavity F1 of the sixth filter branch 17 and the first filter cavity G1 of the seventh filter branch 18 are coupled to the third common cavity C-G; the third common cavity C-G and the port are shared by the third filtering branch 14, the sixth filtering branch 17, the seventh filtering branch 18 and the second common cavity DE, so that the size of the filter 10 can be reduced, the number of taps and tap welding points can be reduced, and the cost of the filter 10 is reduced.

Further, as shown in fig. 1, the housing 11 is further provided with: a first port (not shown) connected to the first common chamber ABC; a second port (not shown) connected to the eighth A8 and the seventh B7 cavities of the first and

second filter branches

12 and 13, respectively; a third port (not shown) connected to the second common chamber DE; a fourth port (not shown) connected to the fourth filter cavity E4 of the fifth filter branch 16; a fifth port (not shown) connected to the third common chamber C-G; a sixth port (not shown) is connected to the seventh filter cavity F7 of the sixth filter branch 17 and to the sixth filter cavity G6 of the seventh filter branch 18.

The port is used for filtering signal transmission; the ports can be taps; the first port, the third port and the fifth port are output ports, and the second port, the fourth port and the sixth port are output ports.

In this embodiment, the first filtering branch 12, the second filtering branch 13, the sixth filtering branch 17, and the seventh filtering branch 18 are transmitting filtering branches, and the third filtering branch 14, the fourth filtering branch 15, and the fifth filtering branch 16 are receiving filtering branches.

As shown in fig. 1, in the first filter branch 12, the coupling bandwidth between the first port of the present embodiment and the first filter cavity a1 is in the range of 91MHz to 95 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 is in the range of 72MHz-76 MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 41MHz to 45 MHz; the coupling bandwidth between the second filter cavity a2 and the fourth filter cavity a4 ranges from 27MHz to 31 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 ranges from 36MHz to 40 MHz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 44MHz to 48 MHz; the coupling bandwidth between the fourth filter cavity A4 and the seventh filter cavity A7 ranges from 7MHz to 11 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 24MHz to 28 MHz; the coupling bandwidth between the fifth filter cavity A5 and the seventh filter cavity A7 ranges from 35MHz to 39 MHz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 33MHz to 37 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 72MHz to 76 MHz; the coupling bandwidth between the eighth filter cavity A8 and the second port ranges from 91MHz to 95MHz, which can meet design requirements.

The resonant frequencies of the first filtering cavity a1 to the eighth filtering cavity A8 of the first filter branch 12 are sequentially in the following ranges: 1748MHz-1750MHz, 1774MHz-1776MHz, 1746MHz-1748MHz, 1753MHz-1755MHz, 1782MHz-1784MHz, 1748MHz-1750MHz, and 1748MHz-1750 MHz.

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.

As shown in fig. 1, in the second filter branch 13, the coupling bandwidth between the first port of the present embodiment and the first filter cavity B1 is in the range of 83MHz-87 MHz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 62MHz to 66 MHz; the coupling bandwidth between the first filter cavity B1 and the third filter cavity B3 ranges from 19MHz to 23 MHz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 is in the range of 42MHz-46 MHz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 is in the range of 34MHz-38 MHz; the coupling bandwidth between the third filter cavity B3 and the fifth filter cavity B5 is in the range of (-28) MHz- (-24) MHz; the coupling bandwidth between the third filter cavity B3 and the sixth filter cavity B6 ranges from 3MHz to 7MHz, and the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 30MHz to 34 MHz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 45MHz to 49 MHz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 ranges from 66MHz to 70 MHz; the coupling bandwidth between the seventh filter cavity B7 and the second port ranges from 83MHz to 87MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity B1 to the seventh filtering cavity B7 of the second filter branch 13 are sequentially in the following ranges: 1946MHz-1948MHz, 1961MHz-1963MHz, 1945MHz-1947MHz, 1921MHz-1923MHz, 1944MHz-1946MHz, 1947MHz-1949MHz, and 1946MHz-1948 MHz.

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

As shown in fig. 1, in the third filter branch 14, the coupling bandwidth between the first port of the present embodiment and the first filter cavity C1 is in the range of 96MHz-100 MHz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 ranges from 54MHz to 58 MHz; the coupling bandwidth between the first filter cavity C1 and the third filter cavity C3 is in the range of (-55) MHz- (-51) MHz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 ranges from 35MHz to 39 MHz; the coupling bandwidth between the third filter chamber C3 and the fourth filter chamber C4 ranges from 54MHz to 59 MHz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 ranges from 76MHz to 80 MHz; the coupling bandwidth range between the fifth filtering cavity C5 and the fifth port is 96MHz-100MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity C1 to the fifth filtering cavity C5 of the third filter branch 14 are sequentially in the following ranges: 1840MHz to 1841MHz, 1805MHz to 1807MHz, 1843MHz to 1845MHz, 1840MHz to 1842MHz, 1840MHz to 1841 MHz.

As shown in fig. 1, in the fourth filter branch 15, the coupling bandwidth between the first port of the present embodiment and the first filter cavity D1 is in the range of 126MHz-130 MHz; the coupling bandwidth between the first filter cavity D1 and the second filter cavity D2 is in the range of 100MHz-104 MHz; the coupling bandwidth between the second filter cavity D2 and the third filter cavity D3 ranges from 71MHz to 75 MHz; the coupling bandwidth between the third filter cavity D3 and the fourth filter cavity D4 ranges from 71MHz to 79 MHz; the coupling bandwidth between the fourth filter cavity D4 and the fifth filter cavity D5 is in the range of 100MHz-104 MHz; the coupling bandwidth between the fifth filter cavity D5 and the fourth port ranges from 126MHz to 130MHz, and the design requirements can be met.

The resonant frequencies of the first filtering cavity D1 to the fifth filtering cavity D5 of the fourth filter branch 15 are sequentially in the following ranges: 2143MHz to 2145MHz, and 2143MHz to 2145 MHz.

As shown in fig. 9, the bandwidth of the second filtering branch 13 is: 1909 + 1987MHz, the band curve is shown as S3, and the suppression of the second filtering branch 13 satisfies: 1880MHz is more than 78dB, 2110MHz is more than 72 dB; the bandwidth of the fourth filtering branch 15 is: 2099 + 2181MHz, the band curve is shown as S4, and the bandwidth of the fourth filtering branch 15 satisfies: 1980MHz is more than 40 dB; the bandwidth of the first filtering branch 12 is: 1707.5-1794MHz, the frequency band curve is shown as S1, the suppression of the first filtering branch 12 satisfies: 1805MHz is more than 78 dB; the bandwidth of the third filtering branch 14 is: 1796-1882.5MHz, the band curve of which is shown in S2, the rejection of the third filtering branch 14: 1785MHz is more than 40dB, 1920MHz is more than 35 dB.

As shown in fig. 1, in the fifth filter branch 16, the coupling bandwidth between the third port and the first filter cavity E1 of the present embodiment is in the range of 180MHz-184 MHz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 ranges from 143MHz to 147 MHz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 ranges from 102MHz to 106 MHz; the coupling bandwidth between the second filter cavity E2 and the fourth filter cavity E4 ranges from 33MHz to 37 MHz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 ranges from 138MHz to 142 MHz; the coupling bandwidth range between the fourth filter cavity E4 and the fourth port is 180MHz-184MHz, which can meet the design requirement.

The resonant frequencies of the first filter cavity E1 to the fourth filter cavity E4 of the fifth filter branch 16 are sequentially in the following ranges: 1468MHz-1470MHz, 1466MHz-1468MHz, 1492MHz-1494MHz, 1468MHz-1470 MHz.

As shown in fig. 1, in the sixth filter branch 17, the coupling bandwidth between the fifth input port of the present embodiment and the first filter cavity F1 is in the range of 88MHz-92 MHz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 is in the range of 69MHz-73 MHz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 ranges from 48MHz to 52 MHz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 ranges from 44MHz to 48 MHz; the coupling bandwidth between the third filter cavity F3 and the sixth filter cavity F6 ranges from 9MHz to 13 MHz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 ranges from 21MHz to 25 MHz; the coupling bandwidth between the fourth filter cavity F4 and the sixth filter cavity F6 ranges from 35MHz to 39 MHz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 ranges from 30MHz to 34 MHz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 ranges from 69MHz to 73 MHz; the coupling bandwidth between the seventh filter cavity F7 and the sixth output port ranges from 88MHz to 92MHz, which can meet the design requirements.

The resonant frequencies of the first filter cavity F1 to the seventh filter cavity F7 of the sixth filter branch 17 are sequentially in the following ranges: 1747MHz-1749MHz, 1746MHz-1748MHz, 1753MHz-1755MHz, 1781MHz-1783MHz, 1746MHz-1748MHz and 1747MHz-1749 MHz.

As shown in fig. 1, in the seventh filter branch 18, the coupling bandwidth between the fifth input port of the present embodiment and the first filter cavity G1 is in the range of 84MHz-88 MHz; the coupling bandwidth between the first filtering cavity G1 and the second filtering cavity G2 ranges from 66MHz to 70 MHz; the coupling bandwidth between the second filter cavity G2 and the third filter cavity G3 ranges from 47MHz to 51 MHz; the coupling bandwidth between the second filter cavity G2 and the fifth filter cavity G5 ranges from 4MHz to 8 MHz; the coupling bandwidth between the third filter cavity G3 and the fourth filter cavity G4 ranges from 29MHz to 33 MHz; the coupling bandwidth between the third filter cavity G3 and the fifth filter cavity G5 is in the range of (-31) MHz- (-27) MHz; the coupling bandwidth between the fourth filter cavity G4 and the fifth filter cavity G5 ranges from 36MHz to 40 MHz; the coupling bandwidth between the fifth filtering cavity G5 and the sixth filtering cavity G6 ranges from 66MHz to 70 MHz; the coupling bandwidth between the sixth filter cavity G6 and the sixth output port ranges from 84MHz to 88MHz, which can meet the design requirement.

Wherein the resonant frequencies of the first filter cavity G1 through the sixth filter cavity G6 in the seventh filter branch 18 are in the following ranges in order: 1946MHz-1948MHz, 1942MHz-1944MHz, 1919MHz-1921MHz, 1946MHz-1948 MHz.

As shown in fig. 10, the bandwidth of the seventh filtering branch 18 is: 1909 + 1985MHz, the band curve is shown as S7, and the suppression of the seventh filtering branch 18 satisfies: 1880MHz is more than 62dB, 2110MHz is more than 45 dB; the bandwidth of the sixth filtering branch 17 is: 1707.5-1791MHz, the frequency band curve is shown as S6, and the suppression of the sixth filtering branch 17 satisfies: 1805MHz is greater than 62 dB; the bandwidth of the fifth filtering branch 16 is: 1404 + 1546MHz, the band curve is shown as S5, and the suppression of the fifth filtering branch 16 satisfies: 960MHz is more than 50dB, and 1710MHz is more than 50 dB.

Further, the bandwidth of this embodiment is: the suppression of the frequency band signal of 549-1021MHz satisfies the following requirements: 1427MHz > 50 dB.

The embodiment of the application realizes the synthesis or frequency division of the multi-channel pilot frequency signals through the common cavity, the isolation between the branch signals is high, the loss is small, the power is large, and the use amount of an antenna feeder system is reduced for the indoor coverage of communication signals.

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. 11, fig. 11 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: a housing having a first direction and a second direction perpendicular to each other; a first common chamber disposed on the housing; the first filtering branch circuit is coupled with the first common cavity, consists of eight filtering cavities which are sequentially coupled along a first coupling path, and forms three coupling zeros of the first filtering branch circuit; the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled along a second coupling path, and forms three coupling zeros of the second filtering branch; the first common cavity is coupled with the first filter cavity of the first filter branch and the first filter cavity of the second filter branch respectively, and the eight filter cavities of the first filter branch and the seven filter cavities of the second filter branch are divided into three rows arranged along the first direction. The first filtering branch and the second filtering branch of the filter share the common cavity, so that the size of the filter can be reduced, the first filtering branch and the second filtering branch can be connected with the common port through the common cavity, and the ports do not need to be arranged for the first filtering branch and the second filtering branch respectively, therefore, the number of taps and tap welding points can be reduced, the cost of the filter can be reduced, and the configuration flexibility of the filter can be improved; meanwhile, the first filtering branch and the second filtering branch are regular in cavity arrangement, so that the production process can be simplified, and the cost is saved.

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:

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

a first common chamber disposed on the housing;

the first filtering branch circuit is coupled with the first common cavity, consists of eight filtering cavities which are sequentially coupled along a first coupling path, and forms three coupling zeros of the first filtering branch circuit;

the second filtering branch is coupled with the first common cavity, consists of seven filtering cavities which are sequentially coupled along a second coupling path, and forms three coupling zeros of the second filtering branch;

the first common cavity is coupled to the first filter cavities of the first filter branch and the second filter branch respectively, and the eight filter cavities of the first filter branch and the seven filter cavities of the second filter branch are divided into three rows arranged along the first direction.

2. The filter according to claim 1, wherein the first filter cavity of the second filter branch is aligned with the first filter cavity, the second filter cavity, the fourth filter cavity and the fifth filter cavity of the first filter branch and is sequentially arranged adjacently along the second direction; the second filter cavity, the third filter cavity and the sixth filter cavity of the second filter branch circuit are in a row with the third filter cavity, the seventh filter cavity and the sixth filter cavity of the first filter branch circuit and are sequentially and adjacently arranged along the second direction; the fourth filtering cavity, the fifth filtering cavity and the seventh filtering cavity of the second filtering branch circuit are in a row with the eighth filtering cavity of the first filtering branch circuit and are sequentially arranged along the second direction;

the third filtering cavity of the second filtering branch circuit is respectively adjacent to the first filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the second filtering branch circuit, the third filtering cavity of the first filtering branch circuit is respectively adjacent to the seventh filtering cavity of the second filtering branch circuit, the second filtering cavity and the fourth filtering cavity of the first filtering branch circuit, and the eighth filtering cavity of the first filtering branch circuit is respectively adjacent to the seventh filtering cavity and the sixth filtering cavity of the first filtering branch circuit.

3. The filter according to claim 2, wherein the inductive cross-coupling between the second filter cavity of the first filter branch and the fourth filter cavity of the first filter branch, the inductive cross-coupling between the fourth filter cavity of the first filter branch and the seventh filter cavity of the first filter branch, and the inductive cross-coupling between the fifth filter cavity of the first filter branch and the seventh filter cavity of the first filter branch form three inductive coupling zeros of the first filter branch;

and the first filter cavity of the second filter branch and the third filter cavity of the second filter branch, and the third filter cavity of the second filter branch and the sixth filter cavity of the second filter branch are inductively cross-coupled to form two inductive coupling zeros of the second filter branch, and the third filter cavity of the second filter branch and the fifth filter cavity of the second filter branch are capacitively cross-coupled to form one capacitive coupling zero of the second filter branch.

4. The filter of claim 2, further comprising:

the third filtering branch consists of five filtering cavities which are sequentially coupled along a third coupling path and forms a coupling zero point of the third filtering branch;

the first filtering cavity of the third filtering branch is coupled with the first common cavity;

the second filtering cavity to the fifth filtering cavity of the third filtering branch are sequentially and adjacently arranged in a straight shape along the second direction; the first filter cavity, the second filter cavity and the third filter cavity of the third filter branch are adjacent and arranged in a triangular shape, and the projection of the first filter cavity of the third filter branch in the first direction is positioned between the projection of the second filter cavity of the third filter branch and the projection of the first common cavity in the first direction;

and the first filter cavity of the third filter branch circuit is capacitively cross-coupled with the third filter cavity of the third filter branch circuit to form a capacitive coupling zero point of the third filter branch circuit.

5. The filter of claim 3, further comprising:

the fourth filtering branch consists of five filtering cavities which are sequentially coupled along a fourth coupling path;

the first filtering cavity to the fourth filtering cavity of the fourth filtering branch are sequentially arranged in a straight shape along the second direction; the projection of the fifth filter cavity of the fourth filter branch in the first direction is located between the first common cavity and the projection of the first filter cavity of the fourth filter branch in the first direction, and the projection of the first common cavity in the second direction is located between the fifth filter cavity of the fourth filter branch and the projection of the first filter cavity of the fourth filter branch in the second direction;

the first common cavity is further coupled to a fifth filter cavity of the fourth filter branch.

6. The filter of claim 5, further comprising:

the fifth filtering branch consists of four filtering cavities which are sequentially coupled along a fifth coupling path and forms a coupling zero point of the fifth filtering branch;

the four filter cavities of the fifth filter branch are sequentially and adjacently arranged in a straight line shape along the second direction;

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

and the second common cavity is arranged on the shell and is respectively coupled with the first filtering cavity of the fourth filtering branch and the first filtering cavity of the fifth filtering branch.

7. The filter of claim 6, further comprising:

and the third common cavity is arranged on the shell and is respectively coupled with the second common cavity and a fifth filtering cavity of the third filtering branch circuit.

8. The filter of claim 7, wherein the filter cavity further comprises:

the sixth filtering branch consists of seven filtering cavities which are sequentially coupled along a sixth coupling path, and two coupling zeros of the sixth filtering branch are formed;

seven filter cavities of the sixth filter branch are sequentially and adjacently arranged along the sixth coupling path, the second filter cavity, the third filter cavity, the sixth filter cavity and the seventh filter cavity of the sixth filter branch are arranged in a diamond shape, the third filter cavity, the sixth filter cavity, the fourth filter cavity and the fifth filter cavity of the sixth filter branch are arranged in a diamond shape, and the third filter cavity, the fourth filter cavity, the sixth filter cavity and the seventh filter cavity of the sixth filter branch are arranged in a diamond shape; the projection of the first filter cavity of the sixth filter branch and the projection of the second filter cavity of the sixth filter branch in the first direction are overlapped, and the projection of the first filter cavity of the sixth filter branch in the first direction is located between the projection of the seventh filter cavity of the sixth filter branch and the projection of the third common cavity in the first direction;

inductive coupling is respectively performed between a third filtering cavity of the sixth filtering branch and a sixth filtering cavity of the sixth filtering branch, and between a fourth filtering cavity of the sixth filtering branch and a sixth filtering cavity of the sixth filtering branch, so as to form two inductive coupling zeros of the sixth filtering branch;

the seventh filtering branch consists of six filtering cavities which are sequentially coupled along a seventh coupling path, and two coupling zeros of the seventh filtering branch are formed;

six filter cavities of the seventh filter branch are sequentially and adjacently arranged along the seventh coupling path, a first filter cavity, a second filter cavity, a fifth filter cavity and a sixth filter cavity of the seventh filter branch are arranged in a diamond shape, and the second filter cavity, the third filter cavity, the fourth filter cavity and the fifth filter cavity of the seventh filter branch are arranged in a diamond shape; the second filter cavity of the seventh filter branch is also respectively adjacent to the fifth filter cavity and the sixth filter cavity of the seventh filter branch, projections of the first filter cavity to the third filter cavity of the seventh filter branch in the second direction are overlapped, projections of the fourth filter cavity to the sixth filter cavity of the seventh filter branch in the second direction are overlapped, and a projection of the third common cavity in the second direction is located between the first filter cavity of the seventh filter branch and the sixth filter cavity of the seventh filter branch;

the second filter cavity of the seventh filter branch is inductively coupled with the fifth filter cavity of the seventh filter branch to form an inductive coupling zero point of the seventh filter branch, and the third filter cavity of the seventh filter branch is capacitively coupled with the fifth filter cavity of the seventh filter branch to form an inductive coupling zero point of the seventh filter branch;

wherein the first filter cavity of the sixth filter branch and the first filter cavity of the seventh filter branch are coupled to the third common cavity.

9. The filter of claim 8, wherein the housing further comprises:

a first port connected to the first common chamber;

the second port is respectively connected with the eighth filter cavity of the first filter branch and the seventh filter cavity of the second filter branch;

a third port connected to the second common chamber;

the fourth port is connected with a fourth filtering cavity of the fifth filtering branch circuit;

a fifth port connected to the third common chamber;

and the sixth port is respectively connected with the seventh filtering cavity of the sixth filtering branch and the sixth filtering cavity of the seventh filtering branch.

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.