CN113131140A

CN113131140A - Filter and communication equipment

Info

Publication number: CN113131140A
Application number: CN201911404916.2A
Authority: CN
Inventors: 李华; 周峰; 宋文刚; 王磊
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-16

Abstract

The application discloses a filter and communication equipment. The filter includes: the shell is provided with a first side and a second side which are arranged oppositely; the first filtering branch is arranged on the first side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the first filtering branch are formed; and the second filtering branch circuit is arranged on the second side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the second filtering branch circuit are formed. In this way, the size of the filter can be reduced and the cost can be 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 present application found in long-term research and development work that the volume of the existing filter is significantly increased with the increase of the number of filter branches, resulting in a larger volume of the filter.

Disclosure of Invention

The application provides a filter and communication equipment to effectively reduce the volume of the filter and save cost.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes: the shell is provided with a first side and a second side which are arranged oppositely; the first filtering branch is arranged on the first side of the shell and consists of ten filtering cavities which are sequentially coupled along a first coupling path, and three coupling zeros of the first filtering branch are formed; and the second filtering branch is arranged on the second side of the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and three coupling zeros of the second filtering branch are formed.

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 shell is provided with a first side and a second side which are arranged oppositely; the first filtering branch is arranged on the first side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the first filtering branch are formed; and the second filtering branch circuit is arranged on the second side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the second filtering branch circuit are formed. In this way, the first filtering branch and the second filtering branch of the filter of the embodiment of the present application are disposed on the two sides of the housing opposite to each other, so that the arrangement space of the first filtering branch and the arrangement space of the second filtering branch can be overlapped, the area of the housing can be effectively reduced, the size of the filter can be effectively reduced, 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 a first side of an embodiment of a filter according to the present application;

FIG. 2 is a schematic diagram of a second side of an embodiment of a filter according to the present application;

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

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

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

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

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

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

FIG. 9 is a schematic diagram of a topology of a seventh filtering branch in an embodiment of the filter of the present application;

FIG. 10 is a schematic diagram of a topology of an eighth filtering branch in 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 11, fig. 1 is a schematic structural diagram of a first side of an embodiment of the filter of the present application; FIG. 2 is a schematic diagram of a second side of an embodiment of a filter according to the present application; FIG. 3 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application; FIG. 4 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application; FIG. 5 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application; FIG. 6 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of the filter of the present application; FIG. 7 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application; FIG. 8 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application; FIG. 9 is a schematic diagram of a topology of a seventh filtering branch in an embodiment of the filter of the present application; FIG. 10 is a schematic diagram of a topology of an eighth filtering branch in 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. The filter 10 of the present embodiment includes: a housing (not shown), a first filtering branch 12, and a second filtering branch 13, wherein the housing has a first side 111 and a second side 112 opposite to each other; the first filtering branch 12 is arranged on the first side 111 of the housing, the first filtering branch 12 is composed of ten filtering cavities a1-a10 coupled in sequence along a first coupling path, the ten filtering cavities a1-a10 further form three coupling zeros of the first filtering branch 12; the second filter branch 13 is composed of ten filter cavities B1-B10 coupled in sequence along a second coupling path, the ten filter cavities B1-B10 further forming three coupling zeros of the second filter branch 13.

As shown in fig. 1, the ten filter cavities a1-a10 of the first filter branch 12 include: a first filtering cavity A1, a second filtering cavity A2, a third filtering cavity A3, a fourth filtering cavity A4, a fifth filtering cavity A5, a sixth filtering cavity A6, a seventh filtering cavity A7, an eighth filtering cavity A8, a ninth filtering cavity A9 and a tenth filtering cavity A10; as shown in fig. 2, the ten filter chambers B1-B10 of the second filter branch 13 include: 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.

Be different from prior art, first filtering branch 12 and the second filtering branch 13 of this embodiment wave filter 10 set up on the both sides that back to the back of the body of casing, can make the space of arranging of first filtering branch 12 overlap with the space of arranging of second filtering branch 13, can effectively reduce the area of casing, consequently can effectively reduce wave filter 10's volume, practice thrift the cost.

In addition, the coupling zero point of the filtering branch of this embodiment can improve the out-of-band rejection and other characteristics of the filtering signal of the filtering branch.

Alternatively, as shown in fig. 1, the housing has a first direction x and a second direction y perpendicular to each other, and the second filter cavity a2 of the first filter branch 12 to the tenth filter cavity a10 of the first filter branch 12 are divided into three columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 1, the second filter cavity a2, the eighth filter cavity A8, the ninth filter cavity a9 and the tenth filter cavity a10 of the first filter branch 12 are in a row and are adjacently arranged along the second direction y; the third filtering cavity A3, the sixth filtering cavity a6 and the seventh filtering cavity a7 of the first filtering branch 12 are in a row and are adjacently arranged along the second direction y; the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 12 are in a row and are adjacently arranged along the second direction y; the third filtering cavity A3 of the first filtering branch 12 is further disposed adjacent to the second filtering cavity a2 of the first filtering branch 12, the fourth filtering cavity a4 of the first filtering branch 12 and the fifth filtering cavity a5 of the first filtering branch 12, and the eighth filtering cavity A8 of the first filtering branch 12 is further disposed adjacent to the sixth filtering cavity a6 of the first filtering branch 12 and the seventh filtering cavity a7 of the first filtering branch 12; the first filtering cavity a1 of the first filtering branch 12 is disposed adjacent to the second filtering cavity a2 of the first filtering branch 12, and the second filtering cavity a2 of the first filtering branch 12 is close to the middle of the casing in the first direction x relative to the first filtering cavity a1 of the first filtering branch 12.

As can be seen from the above analysis, three rows of filter cavities of the first filter branch 12 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, so that the arrangement space of the first filter branch 12 can be reduced; and the three rows of filtering cavities are arranged in a staggered manner, so that the arrangement space of the first filtering branch 12 can be further reduced.

Further, as shown in fig. 1, the ten filter cavities a1-a10 of the first filter branch 12 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 first filter branch 12 can be more compact, and the arrangement space of the first filter branch 12 can be reduced.

As shown in fig. 1, capacitive cross coupling is performed between the third filter cavity A3 of the first filter branch 12 and the fifth filter cavity a5 of the first filter branch 12, and between the third filter cavity A3 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, so as to form two capacitive coupling zeros of the first filter branch 12; the seventh filter cavity a7 of the first filter branch 12 is inductively cross-coupled with the ninth filter cavity a9 of the first filter branch 12 to form an inductive coupling zero 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 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 C2 shown in fig. 3) is disposed between the third filter cavity A3 of the first filter branch 12 and the fifth filter cavity a5 of the first filter branch 12, and a flying bar (equivalent to the capacitor C1 shown in fig. 3) is disposed between the third filter cavity A3 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12. From the above analysis, the distance between the third filter cavity A3 and the fifth filter cavity a5 is equal to the distance between the third filter cavity A3 and the sixth filter cavity a6, so that the flying bar elements with the same specification can be adopted to achieve the effect of realizing two capacitive coupling zeros of the first filter branch 12. When the first filtering branch 12 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

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. 3) are disposed between the seventh filter cavity a7 of the first filter branch 12 and the ninth filter cavity a9 of the first filter branch 12, and a window and a metal coupling rib (equivalent to the capacitor L1 shown in fig. 3) are disposed between the seventh filter cavity a7 and the ninth filter cavity a 9. 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 as to reduce the temperature drift of the filter 10.

Alternatively, as shown in fig. 2, the fourth filter chamber B4 to the tenth filter chamber B10 of the second filter branch 13 are divided into two columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 2, the fourth filter cavity B4 and the seventh filter cavity B7 of the second filter branch 13 are in a row and are sequentially and adjacently arranged along the second direction y; the fifth filtering cavity B5, the sixth filtering cavity B6, the eighth filtering cavity B8, the ninth filtering cavity B9 and the tenth filtering cavity B10 of the second filtering branch 13 are in a row and are sequentially and adjacently arranged along the second direction y; the fourth filtering cavity B4 of the second filtering branch 13 is also adjacent to the second filtering cavity B2, the third filtering cavity B3, the fifth filtering cavity B5 and the sixth filtering cavity B6 of the second filtering branch 13, and the first filtering cavity B1 of the second filtering branch 13 is also adjacent to the second filtering cavity B2 and the third filtering cavity B3 of the second filtering branch 13; the distances from the center of the first filter cavity B1 of the second filter branch 12, the center of the third filter cavity B3 of the second filter branch 13, the center of the second filter cavity B2 of the second filter branch 13, and the center of the fourth filter cavity B4 of the second filter branch 13 to the bisector of the housing in the first direction x decrease in sequence, and the distances from the center of the second filter cavity B2 of the second filter branch 13, the center of the first filter cavity B1 of the second filter branch 13, the center of the fourth filter cavity B4 of the second filter branch 13, and the center of the third filter cavity B3 of the second filter branch 13 to the bisector of the housing in the second direction y decrease in sequence.

As can be seen from the above analysis, two rows of filter cavities of the second filter branch 13 are adjacently disposed, a plurality of filter cavities in each row are sequentially adjacently disposed, and the two rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the second filter branch 13 can be reduced; and the first four filtering cavities are prismatic and arranged two by two adjacently, so that the arrangement space of the second filtering branch 13 in the second direction y can be reduced.

Further, as shown in fig. 2, the ten filter cavities B1-B10 of the second 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 cavities in the row of the second filter branch 13 can be more compact, and the arrangement space of the second filter branch 13 can be reduced.

As shown in fig. 2, capacitive cross coupling is performed between the fourth filter cavity B4 of the second filter branch 13 and the sixth filter cavity B6 of the second filter branch 13, and between the fourth filter cavity B4 of the second filter branch 13 and the seventh filter cavity B7 of the second filter branch 13, so as to form two capacitive coupling zeros of the second filter branch 13; the first filter cavity B1 of the second filter branch 13 is inductively cross-coupled with the third filter cavity B3 of the second filter branch 13 to form an inductive coupling zero point of the second filter branch 13.

As shown in fig. 4, a flying bar (equivalent to the capacitor C3 shown in fig. 4) is disposed between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 13, and a flying bar (equivalent to the capacitor C4 shown in fig. 4) is disposed between the fourth filter cavity B4 and the seventh filter cavity B7 of the second filter branch 13. From the above analysis, the distance between the fourth filter cavity B4 and the sixth filter cavity B6 and the distance between the fourth filter cavity B4 and the seventh filter cavity B7 are equal, so that the flying bar elements with the same specification can be adopted, and the effect of realizing two capacitive coupling zeros of the second filter branch 13 can be achieved. When the second filtering branch 13 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

As shown in fig. 4, a window and a metal coupling rib (equivalent to the capacitor L2 shown in fig. 4) are disposed between the first filter cavity B1 and the third filter cavity B3 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 subjected to a small change of the external temperature, so as to reduce the temperature drift of the filter 10.

Optionally, as shown in fig. 1, the filter 10 further includes a third filtering branch 14 disposed on the first side 111 of the housing, the third filtering branch 14 being composed of twelve filtering cavities C1-C12 coupled in sequence and forming five coupling zeros of the third filtering branch 14.

As shown in fig. 1, the twelve filter cavities C1-C12 of the third filter branch 14 include: a first filtering cavity C1, a second filtering cavity C2, a third filtering cavity C3, a fourth filtering cavity C4, a fifth filtering cavity C5, a sixth filtering cavity C6, a seventh filtering cavity C7, an eighth filtering cavity C8, a ninth filtering cavity C9, a tenth filtering cavity C10, an eleventh filtering cavity C11 and a twelfth filtering cavity C12.

As shown in fig. 1, the fourth filter cavity C4 of the third filter branch 14 to the eleventh filter cavity C11 of the third filter branch 14 are divided into three columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 1, the fourth filter cavity C4, the fifth filter cavity C5 and the ninth filter cavity C9 of the third filter branch 14 are in a row and are sequentially and adjacently arranged along the second direction y, the sixth filter cavity C6, the eighth filter cavity C8 and the tenth filter cavity C10 of the third filter branch 14 are in a row and are sequentially and adjacently arranged along the second direction y, and the seventh filter cavity C7 and the eleventh filter cavity C11 of the third filter branch 14 are in a row and are sequentially and adjacently arranged along the second direction y; the eighth filtering cavity C8 of the third filtering branch 14 is further disposed adjacent to the fifth filtering cavity C5 of the third filtering branch 14, the ninth filtering cavity C9 of the third filtering branch 14, the seventh filtering cavity C7 of the third filtering branch 14, and the eleventh filtering cavity C11 of the third filtering branch, and the fourth filtering cavity C4 of the third filtering branch 14 is further disposed adjacent to the sixth filtering cavity C6 of the third filtering branch 14 and the third filtering cavity C3 of the third filtering branch 14; the first filter cavity C1, the second filter cavity C2, and the third filter cavity C3 of the third filter branch 14 are in a row and are sequentially and adjacently arranged along the second direction y, the third filter cavity C3 of the third filter branch 14 is close to the middle division line of the housing in the first direction x relative to the fourth filter cavity C4 of the third filter branch 14, and the projection of the center of the third filter cavity C3 of the third filter branch 14 in the first direction x is located between the projection of the center of the fourth filter cavity C4 of the third filter branch 14 in the first direction x and the projection of the center of the sixth filter cavity C6 of the third filter branch 14 in the first direction x; the twelfth filter cavity C12 of the third filter branch 14 is disposed adjacent to the eleventh filter cavity C11 of the first filter branch 14, and the center of the twelfth filter cavity C12 of the third filter branch 14 is located on an extension line of a connecting line between the center of the eleventh filter cavity C11 of the third filter branch 14 and the center of the eighth filter cavity C8 of the third filter branch 14.

As can be seen from the above analysis, three rows of filter cavities in the four rows of filter cavities of the third filter branch 14 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, and the three rows of filter cavities are alternately disposed, so that the arrangement space of the third filter branch 14 can be reduced; the three rows of filter cavities and the other row of filter cavities are arranged along the second direction y, so that the arrangement space of the third filter branch 14 in the first direction x can be reduced.

As shown in fig. 1, capacitive cross coupling is respectively performed between the third filter cavity C3 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14, between the fourth filter cavity C4 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14, and between the eighth filter cavity C8 of the third filter branch 14 and the tenth filter cavity C10 of the third filter branch 14, so as to form three capacitive coupling zeros of the third filter branch 14, inductive cross coupling is performed between the sixth filter cavity C6 of the third filter branch 14 and the eighth filter cavity C8 of the third filter branch 14, and between the eighth filter cavity C8 of the third filter branch 14 and the eleventh filter cavity C11 of the third filter branch 14, so as to form two inductive coupling zeros of the third filter branch 14.

As shown in fig. 5, a flying bar (equivalent to the capacitor C5 shown in fig. 5) is disposed between the third filter cavity C3 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14, a flying bar (equivalent to the capacitor C6 shown in fig. 5) is disposed between the fourth filter cavity C4 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14, and a flying bar (equivalent to the capacitor C7 shown in fig. 5) is disposed between the eighth filter cavity C8 of the third filter branch 14 and the tenth filter cavity C10 of the third filter branch 14.

As shown in fig. 5, a window and a metal coupling rib (equivalent to the capacitor L3 shown in fig. 5) are provided between the sixth filter cavity C6 and the eighth filter cavity C8, and a window and a metal coupling rib (equivalent to the capacitor L4 shown in fig. 5) are provided between the eighth filter cavity C8 and the eleventh filter cavity C11. 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 as to reduce the temperature drift of the filter 10.

Optionally, as shown in fig. 1, the filter 10 further includes: and a fourth filtering branch 15 disposed on the first side 111 of the housing, the fourth filtering branch 15 being composed of ten filtering cavities D1-D10 coupled in sequence, and forming three coupling zeros of the fourth filtering branch 15.

As shown in fig. 1, the ten filter cavities D1-D10 of the fourth 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 first filter cavity D1 of the fourth filter branch 15 to the ninth filter cavity D9 of the fourth filter branch 15 are divided into three columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 1, the first filter cavity D1 and the second filter cavity D2 of the fourth filter branch 15 are in a row and are sequentially and adjacently arranged along the second direction y, the third filter cavity D3, the fourth filter cavity D4, the seventh filter cavity D7 and the ninth filter cavity D9 of the fourth filter branch 15 are in a row and are sequentially and adjacently arranged along the second direction y, and the fifth filter cavity D5, the sixth filter cavity D6 and the eighth filter cavity D8 of the fourth filter branch 15 are in a row and are sequentially and adjacently arranged along the second direction y; the third filtering cavity D3 of the fourth filtering branch 15 is further disposed adjacent to the first filtering cavity D1 of the fourth filtering branch 15, the second filtering cavity D2 of the fourth filtering branch 15, the fifth filtering cavity D5 of the fourth filtering branch 15 and the sixth filtering cavity D6 of the fourth filtering branch 15, the ninth filtering cavity D9 of the fourth filtering branch 15 is further disposed adjacent to the eighth filtering cavity D8 of the fourth filtering branch 15 and the tenth filtering cavity D10 of the fourth filtering branch 15, and the ninth filtering cavity D9 of the fourth filtering branch 15 is closer to the center of the housing in the first direction x relative to the tenth filtering cavity D10 of the fourth filtering branch 15.

Through the analysis, three rows of filter cavities of the fourth filter branch 15 are adjacently arranged, and a plurality of filter cavities in each row are sequentially adjacently arranged, so that the arrangement space of the fourth filter branch 15 can be reduced; and the three rows of filtering cavities are arranged in a staggered manner, so that the arrangement space of the fourth filtering branch 15 can be further reduced.

Further, as shown in fig. 1, the ten filter cavities D1-D10 of the fourth filter branch 15 have the same size, and it can be known from the arrangement of the filter cavities that the distances between the centers of any two adjacent filter cavities are equal, so that the cavity array of the fourth filter branch 15 can be more compact, and the arrangement space of the fourth filter branch 15 can be reduced.

As shown in fig. 1, capacitive cross coupling is respectively performed between the third filter cavity D3 of the fourth filter branch 15 and the fifth filter cavity D5 of the fourth filter branch 15, and between the third filter cavity D3 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, so as to form two capacitive coupling zeros of the fourth filter branch 15, and inductive cross coupling is performed between the seventh filter cavity D7 of the fourth filter branch 15 and the ninth filter cavity D9 of the fourth filter branch 15, so as to form one inductive coupling zero of the fourth filter branch 15.

As shown in fig. 6, a flying bar (equivalent to the capacitor C8 shown in fig. 6) is disposed between the third filter cavity D3 of the fourth filter branch 15 and the fifth filter cavity D5 of the fourth filter branch 15, and a flying bar (equivalent to the capacitor C9 shown in fig. 6) is disposed between the third filter cavity D3 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15. From the above analysis, the distance between the third filter cavity D3 and the fifth filter cavity D5 is equal to the distance between the third filter cavity D3 and the sixth filter cavity D6, so that the flying bar elements with the same specification can be adopted to achieve the effect of realizing two capacitive coupling zeros of the fourth filter branch 15. When the fourth filtering branch 15 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

As shown in fig. 6, a window and a metal coupling rib (equivalent to the capacitor L5 shown in fig. 6) are disposed between the seventh filter cavity D7 and the ninth filter cavity D9. 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 as to reduce the temperature drift of the filter 10.

As shown in fig. 1, the filter 10 further includes: and a fifth filtering branch 16 disposed on the first side 111 of the housing, the fifth filtering branch 16 being composed of twelve filtering cavities E1-E12 coupled in sequence and forming five coupling zeros of the fifth filtering branch 16.

As shown in fig. 1, the twelve filter cavities E1-E12 of the fifth filter branch 16 include: the filter comprises 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, an eighth filter cavity E8, a ninth filter cavity E9, a tenth filter cavity E10, an eleventh filter cavity E11 and a twelfth filter cavity E12.

As shown in fig. 1, the third filter cavity E3 of the fifth filter branch 16 to the twelfth filter cavity E12 of the fifth filter branch 16 are divided into four columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 1, the fourth filter cavity E4 and the fifth filter cavity E5 of the fifth filter branch 16 are in a row and are sequentially and adjacently arranged along the second direction y, the third filter cavity E3, the sixth filter cavity E6 and the seventh filter cavity E7 of the fifth filter branch 16 are in a row and are sequentially and adjacently arranged along the second direction y, the ninth filter cavity E9, the eighth filter cavity E8 and the twelfth filter cavity E12 of the fifth filter branch 16 are in a row and are sequentially and adjacently arranged along the second direction y, and the tenth filter cavity E10 and the eleventh filter cavity E11 of the fifth filter branch 16 are in a row and are sequentially and adjacently arranged along the second direction y; the sixth filtering cavity E6 of the fifth filtering branch 16 is further disposed adjacent to the fourth filtering cavity E4 of the fifth filtering branch 16, the fifth filtering cavity E5 of the fifth filtering branch 16, the eighth filtering cavity E8 of the fifth filtering branch 16 and the ninth filtering cavity E9 of the fifth filtering branch 16, and the eighth filtering cavity E8 of the fifth filtering branch 16 is further disposed adjacent to the tenth filtering cavity E10 of the fifth filtering branch 16 and the eleventh filtering cavity E11 of the fifth filtering branch 16; the first filter cavity E1, the second filter cavity E2 and the third filter cavity E3 of the fifth filter branch 16 are sequentially and adjacently arranged, the second filter cavity E2 of the fifth filter branch 16 is close to the housing toward the midline of the housing in the first direction x relative to the third filter cavity E3 of the fifth filter branch 16, and the projection of the center of the first filter cavity E1 of the fifth filter branch 16 in the first direction x is located between the projection of the center of the third filter cavity E3 of the fifth filter branch 16 in the first direction x and the projection of the center of the third filter cavity E3 of the fifth filter branch 16 in the first direction x, and the projection of the center of the second filter cavity E2 of the fifth filter branch 16 in the second direction y is located between the projection of the center of the third filter cavity E3 of the fifth filter branch 16 in the second direction y and the projection of the center of the first filter cavity E1 of the fifth filter branch 16 in the second direction y.

As can be seen from the above analysis, the four rows of filter cavities of the fifth filter branch 16 are adjacently disposed, and the multiple filter cavities in each row are sequentially adjacently disposed, so that the arrangement space of the fifth filter branch 16 can be reduced; and the three rows of filtering cavities are arranged in a staggered manner, so that the arrangement space of the fifth filtering branch 16 can be further reduced.

Further, as shown in fig. 1, the sizes of the third filter cavity E3 to the twelfth filter cavity E12 of the fifth filter branch 16 are all the same, and it can be known from the arrangement of the filter cavities that the distances between the centers of any two adjacent filter cavities in the third filter cavity E3 to the twelfth filter cavity E12 are all the same, so that the row cavities of the fifth filter branch 16 can be more compact, and the arrangement space of the fifth filter branch 16 can be reduced.

As shown in fig. 1, capacitive cross coupling is respectively performed between the third filter cavity E3 of the fifth filter branch 16 and the sixth filter cavity E6 of the fifth filter branch 16, between the fourth filter cavity E4 of the fifth filter branch 16 and the sixth filter cavity E6 of the fifth filter branch 16, and between the eighth filter cavity E8 of the fifth filter branch 16 and the tenth filter cavity E10 of the fifth filter branch 16, so as to form three capacitive coupling zeros of the fifth filter branch 16, inductive cross coupling is performed between the sixth filter cavity E6 of the fifth filter branch 16 and the eighth filter cavity E8 of the fifth filter branch 16, and between the eighth filter cavity E8 of the fifth filter branch 16 and the eleventh filter cavity E11 of the fifth filter branch 16, so as to form two inductive coupling zeros of the fifth filter branch 16.

As shown in fig. 7, a flying bar (equivalent to the capacitor C10 shown in fig. 7) is provided between the third filter cavity E3 and the sixth filter cavity E6, a flying bar (equivalent to the capacitor C11 shown in fig. 7) is provided between the fourth filter cavity E4 and the sixth filter cavity E6, and a flying bar (equivalent to the capacitor C12 shown in fig. 7) is provided between the eighth filter cavity E8 and the tenth filter cavity E10. From the above analysis, it can be known that the distance between the third filter cavity E3 and the sixth filter cavity E6, the distance between the fourth filter cavity E4 and the sixth filter cavity E6, and the distance between the eighth filter cavity E8 and the tenth filter cavity E10 are equal, so that the flying rod elements with the same specification can be adopted, and the effect of realizing two capacitive coupling zeros of the fifth filter branch 16 can be achieved. When the fifth filtering branch 16 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

As shown in fig. 7, a window and a metal coupling rib (equivalent to the capacitor L6 shown in fig. 7) are provided between the sixth filter cavity E6 and the eighth filter cavity E8, and a window and a metal coupling rib (equivalent to the capacitor L7 shown in fig. 7) are provided between the eighth filter cavity E8 and the eleventh filter cavity E11. 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 as to reduce the temperature drift of the filter 10.

Optionally, the first filter cavity a1 and the second filter cavity a2 of the first filter branch 12 are disposed adjacent to the first filter cavity C1 of the third filter branch 14, the eighth filter cavity A8 of the first filter branch 12 is disposed adjacent to the second filter cavity C2 of the third filter branch 14, the ninth filter cavity a9 of the first filter branch 12 is disposed adjacent to the third filter cavity C3 of the third filter branch 14, and the tenth filter cavity a10 of the first filter branch 12 is disposed adjacent to the sixth filter cavity C6 of the third filter branch 14; the fifth filter cavity E5 of the fifth filter branch 16 is disposed adjacent to the seventh filter cavity C7 of the third filter branch 16, the eleventh filter cavity C11 of the third filter branch 16 and the twelfth filter cavity C12 of the third filter branch 14; the first filter cavity E1 of the fifth filter branch 16 is arranged adjacent to the fifth filter cavity a5 of the first filter branch 12 and the second filter cavity D2 of the fourth filter branch 15.

The adjacent arrangement of the partial filter cavities of each filter branch can further reduce the arrangement space of the filter branches and reduce the volume of the filter 10.

Optionally, the filter 10 further comprises a sixth filtering branch 17 disposed on the second side 112 of the housing, the sixth filtering branch 17 being composed of twelve filtering cavities F1-F12 coupled in sequence and forming five coupling zeros of the sixth filtering branch 17.

As shown in fig. 2, the twelve filter cavities F1-a12 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 F5, a sixth filter cavity F6, a seventh filter cavity F7, an eighth filter cavity F8, a ninth filter cavity F9, a tenth filter cavity F10, an eleventh filter cavity F11 and a twelfth filter cavity F12.

As shown in fig. 2, the seventh filter cavity F7 of the sixth filter branch 17 to the twelfth filter cavity F12 of the sixth filter branch 17 are divided into three columns arranged along the first direction x; the arrangement in a row can reduce the arrangement space of the filter cavity and the volume of the filter 10.

As shown in fig. 2, the seventh filter cavity F7, the eleventh filter cavity F11 and the twelfth filter cavity F12 of the sixth filter branch 17 are in a row and are sequentially and adjacently arranged along the second direction y, the eighth filter cavity F8 and the tenth filter cavity F10 of the sixth filter branch 17 are in a row and are sequentially and adjacently arranged along the second direction y, and the ninth filter cavity F9 of the sixth filter branch 17 is in a row; the eighth filtering cavity F8 of the sixth filtering branch 17 is further disposed adjacent to the sixth filtering cavity F6 of the sixth filtering branch 17, the seventh filtering cavity F7 of the sixth filtering branch 17, the eleventh filtering cavity F11 of the sixth filtering branch 17 and the ninth filtering cavity F9 of the sixth filtering branch 17, the sixth filter cavity F6 of the sixth filter branch 17 is further disposed adjacent to the fifth filter cavity F5 of the sixth filter branch 17, the distances from the center of the fifth filter cavity F5 of the sixth filter branch 17, the center of the sixth filter cavity F6 of the sixth filter branch 17, and the center of the eighth filter cavity F8 of the sixth filter branch 17 to the middle dividing line of the housing in the first direction x decrease sequentially, the distances from the center of the eighth filter cavity F8 of the sixth filter branch 17, the center of the sixth filter cavity F6 of the sixth filter branch 17, and the center of the fifth filter cavity F5 of the sixth filter branch 17 to the bisector of the housing in the second direction y decrease in sequence; the fifth filter cavity F5 of the sixth filter branch 17 is further disposed adjacent to the second filter cavity F2 of the sixth filter branch 17 and the fourth filter cavity F4 of the sixth filter branch 17, the third filter cavity F3 of the sixth filter branch 17 is disposed adjacent to the fourth filter cavity F4 of the sixth filter branch 17 and the first filter cavity F1 of the sixth filter branch 17, the first filter cavity F1 of the sixth filter branch 17 is further disposed adjacent to the second filter cavity F2 of the sixth filter branch 17, the center of the second filter cavity F2 of the sixth filter branch 17, the center of the first filter cavity F1 of the sixth filter branch 17, the center of the fifth filter cavity F5 of the sixth filter branch 17, the center of the third filter cavity F3 of the sixth filter branch 17, the center of the fourth filter cavity F4 of the sixth filter branch 17, and the branching distance x between the centers of the sixth filter cavities in the first direction of the housing, the fifth filter cavity F2 of the sixth filter branch 17, and the fourth filter cavity F4 of the sixth filter branch 17, Distances between the projection of the center of the first filter cavity F1 of the sixth filter branch 17, the center of the fifth filter cavity F5 of the sixth filter branch 17, the center of the third filter cavity F3 of the sixth filter branch 17 and the center of the fourth filter cavity F4 of the sixth filter branch 17 in the first direction x and the bisector of the housing in the first direction x decrease in sequence;

as can be seen from the above analysis, three rows of filter cavities of the sixth filter branch 17 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, and the three rows of filter cavities are alternately disposed and are also adjacently disposed between the sequentially coupled filter cavities, so that the arrangement space of the sixth filter branch 17 can be further reduced.

As shown in fig. 2, capacitive cross coupling is respectively performed between the second filter cavity F2 of the sixth filter branch 17 and the fourth filter cavity F4 of the sixth filter branch 17, between the second filter cavity F2 of the sixth filter branch 17 and the fifth filter cavity F5 of the sixth filter branch 17, between the sixth filter cavity F6 of the sixth filter branch 17 and the eighth filter cavity F8 of the sixth filter branch 17, and between the eighth filter cavity F8 of the sixth filter branch 17 and the eleventh filter cavity F11 of the sixth filter branch 17, so as to form four capacitive coupling zeros of the sixth filter branch 17, and inductive cross coupling is performed between the eighth filter cavity F8 of the sixth filter branch 17 and the tenth filter cavity F10 of the sixth filter branch 17, so as to form one inductive coupling zero of the sixth filter branch 17.

As shown in fig. 8, a flying bar (equivalent to the capacitor C13 shown in fig. 8) is provided between the second filter chamber F2 and the fourth filter chamber F4, a flying bar (equivalent to the capacitor C14 shown in fig. 8) is provided between the second filter chamber F2 and the fifth filter chamber F5, a flying bar (equivalent to the capacitor C15 shown in fig. 8) is provided between the sixth filter chamber F6 and the eighth filter chamber F8, and a flying bar (equivalent to the capacitor C16 shown in fig. 8) is provided between the eighth filter chamber F8 and the eleventh filter chamber F11.

As shown in fig. 8, a window and a metal coupling rib (equivalent to the capacitor L8 shown in fig. 8) are provided between the eighth filter chamber F8 and the tenth filter chamber F10. 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 as to reduce the temperature drift of the filter 10.

Optionally, the filter 10 further comprises: and a seventh filtering branch 18 disposed on the second side 112 of the housing, the seventh filtering branch 18 being composed of ten filtering cavities G1-G10 coupled in sequence and forming three coupling zeros of the seventh filtering branch 18.

As shown in fig. 2, the ten filter cavities G1-G10 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 G5, a sixth filter cavity G6, a seventh filter cavity G7, an eighth filter cavity G8, a ninth filter cavity G9 and a tenth filter cavity G10.

As shown in fig. 2, the third filtering cavity G3 of the seventh filtering branch 18 to the tenth filtering cavity G10 of the seventh filtering branch 18 are divided into two rows arranged along the first direction x, and the arrangement space of the filtering cavities can be reduced by arranging the two rows, and the size of the filter 10 can be reduced.

The third filtering cavity G3, the fourth filtering cavity G4, the seventh filtering cavity G7, the eighth filtering cavity G8 and the tenth filtering cavity G10 of the seventh filtering branch 18 are in a row and are sequentially and adjacently arranged along the second direction y, the fifth filtering cavity G5, the sixth filtering cavity G6 and the ninth filtering cavity G9 of the seventh filtering branch 18 are in a row and are sequentially and adjacently arranged along the second direction y, the seventh filtering cavity G7 of the seventh filtering branch 18 is further adjacently arranged with the fifth filtering cavity G5 of the seventh filtering branch 18 and the sixth filtering cavity G6 of the seventh filtering branch 18, and the tenth filtering cavity G10 of the seventh filtering branch 18 is further adjacently arranged with the ninth filtering cavity G9 of the seventh filtering branch 18; the second filter cavity G2 of the seventh filter branch 18 is further disposed adjacent to the first filter cavity G1 of the seventh filter branch 18 and the third filter cavity G3 of the seventh filter branch 18, a projection of the center of the second filter cavity G2 of the seventh filter branch 18 in the first direction x is located between a projection of the center of the first filter cavity G1 of the seventh filter branch 18 in the first direction x and a projection of the third filter cavity G3 of the seventh filter branch 18 in the first direction x, and a projection of the center of the first filter cavity G1 of the seventh filter branch 18 in the second direction y is located between a projection of the center of the second filter cavity G2 of the seventh filter branch 18 in the second direction y and a projection of the third filter cavity G3 of the seventh filter branch 18 in the second direction y.

As can be seen from the above analysis, two rows of filter cavities of the seventh filter branch 18 are adjacently disposed, a plurality of filter cavities in each row are sequentially adjacently disposed, the two rows of filter cavities are alternately disposed, and the sequentially coupled filter cavities are also adjacently disposed, so that the arrangement space of the seventh filter branch 18 can be further reduced.

Further, as shown in fig. 2, the ten filter cavities G1-G10 of the seventh 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 row cavities of the seventh filter branch 18 can be more compact, and the arrangement space of the seventh filter branch 18 can be reduced.

As shown in fig. 2, capacitive cross coupling is respectively performed between the fourth filtering cavity G4 of the seventh filtering branch 18 and the seventh filtering cavity G7 of the seventh filtering branch 18, and between the fifth filtering cavity G5 of the seventh filtering branch 18 and the seventh filtering cavity G7 of the seventh filtering branch 18, so as to form two capacitive coupling zeros of the seventh filtering branch 18, and inductive cross coupling is performed between the eighth filtering cavity G8 of the seventh filtering branch 18 and the tenth filtering cavity G10 of the seventh filtering branch 18, so as to form one inductive coupling zero of the seventh filtering branch 18.

As shown in fig. 9, a flying rod (equivalent to the capacitor C17 shown in fig. 9) is provided between the fourth filter chamber G4 and the seventh filter chamber G7, and a flying rod (equivalent to the capacitor C18 shown in fig. 9) is provided between the fifth filter chamber G5 and the seventh filter chamber G7. From the above analysis, it can be seen that the distance between the fourth filter cavity G4 and the seventh filter cavity G7 is equal to the distance between the fifth filter cavity G5 and the seventh filter cavity G7, so that the flying bar elements with the same specification can be used to achieve the effect of implementing the two capacitive coupling zeros of the seventh filter branch 18. When the seventh filtering branch 18 is formed, the types of materials can be reduced, the manufacturing is convenient, the complexity of the product is reduced, and the cost is saved.

As shown in fig. 9, a window and a metal coupling rib (equivalent to the capacitor L9 shown in fig. 9) are disposed between the eighth filter chamber G8 and the tenth filter chamber G10. 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 as to reduce the temperature drift of the filter 10.

As shown in fig. 2, the filter 10 further includes: and an eighth filtering branch 19 disposed on the second side 112 of the housing, the eighth filtering branch 19 being composed of twelve filtering cavities H1-H12 coupled in sequence, and forming five coupling zeros of the eighth filtering branch 19.

As shown in fig. 2, the twelve filter cavities H1-H12 of the eighth 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, a tenth filter cavity H10, an eleventh filter cavity H11 and a twelfth filter cavity H12.

As shown in fig. 2, the seventh filtering cavity H8 of the eighth filtering branch 19 to the twelfth filtering cavity H12 of the eighth filtering branch 19 are divided into three rows arranged along the first direction x, and the arrangement space of the filtering cavities can be reduced by arranging the three rows, so that the volume of the filter 10 can be reduced.

As shown in fig. 2, the seventh filtering cavity H7, the eleventh filtering cavity H11 and the twelfth filtering cavity H12 of the eighth filtering branch 19 are in a row and are sequentially and adjacently arranged along the second direction y, the eighth filtering cavity H8 and the tenth filtering cavity H10 of the eighth filtering branch 19 are in a row and are sequentially and adjacently arranged along the second direction y, and the ninth filtering cavity H9 of the eighth filtering branch 19 is in a row; the eighth filtering cavity H8 of the eighth filtering branch 19 is further disposed adjacent to the ninth filtering cavity H9 of the eighth filtering branch 19, the seventh filtering cavity H7 of the eighth filtering branch 19, the eleventh filtering cavity H11 of the eighth filtering branch 19 and the eighth filtering cavity H8 of the eighth filtering branch 19, the sixth filtering cavity H6 of the eighth filtering branch 19 is disposed adjacent to the eighth filtering cavity H8 of the eighth filtering branch 19, the fourth filtering cavity H4 of the eighth filtering branch 19 and the sixth filtering cavity H6 of the eighth filtering branch 19, the third filtering cavity H3 of the eighth filtering branch 19, the second filtering cavity H2 of the eighth filtering branch 19 and the first filtering cavity H1 of the eighth filtering branch 19 are disposed adjacent to each other; the sixth filtering cavity H6, the fifth filtering cavity H5, the fourth filtering cavity H4 and the first filtering cavity H1 are arranged along the second direction y relative to the eighth filtering cavity H8 and gradually get close to the center-split line of the shell in the first direction x.

As can be seen from the above analysis, three rows of filter cavities in the four rows of filter cavities of the eighth filter branch 19 are adjacently disposed, and a plurality of filter cavities in each row are sequentially adjacently disposed, and the three rows of filter cavities are alternately disposed; and the filter cavities coupled in sequence are adjacently arranged, so that the arrangement space of the eighth filter branch 19 can be reduced.

As shown in fig. 2, capacitive cross coupling is respectively performed between the second filter cavity H2 of the eighth filter branch 19 and the fourth filter cavity H4 of the eighth filter branch 19, between the second filter cavity H2 of the eighth filter branch 19 and the fifth filter cavity H5 of the eighth filter branch 19, between the sixth filter cavity H6 of the eighth filter branch 19 and the eighth filter cavity H8 of the eighth filter branch 19, and between the eighth filter cavity H8 of the eighth filter branch 19 and the eleventh filter cavity H11 of the eighth filter branch 19, so as to form four capacitive coupling zeros of the eighth filter branch 19, and inductive cross coupling is performed between the eighth filter cavity H8 of the eighth filter branch 19 and the tenth filter cavity H10 of the eighth filter branch 19, so as to form an inductive coupling zero of the eighth filter branch 19.

As shown in fig. 10, a flying bar (equivalent to the capacitor C19 shown in fig. 10) is provided between the second filter chamber H2 and the fourth filter chamber H4, a flying bar (equivalent to the capacitor C20 shown in fig. 10) is provided between the second filter chamber H2 and the fifth filter chamber H5, a flying bar (equivalent to the capacitor C21 shown in fig. 10) is provided between the sixth filter chamber H6 and the eighth filter chamber H8, and a flying bar (equivalent to the capacitor C22 shown in fig. 10) is provided between the eighth filter chamber H8 and the eleventh filter chamber H11.

As shown in fig. 10, a window and a metal coupling rib (equivalent to the capacitor L10 shown in fig. 10) are provided between the eighth filter chamber H8 and the tenth filter chamber H10. 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 as to reduce the temperature drift of the filter 10.

Optionally, the filter cavity of part of the second filter branch 13 and the filter cavity of part of the seventh filter branch 18 are located between the sixth filter branch 17 and the eighth filter branch 19; the tenth filtering cavity B10 of the second filtering branch 13 is further respectively disposed adjacent to the fourth filtering cavity F4 of the sixth filtering branch 17, the eighth filtering cavity G8 of the seventh filtering branch 18, and the tenth filtering cavity G10 of the seventh filtering branch 18, the third filtering cavity B3 of the second filtering branch 13 is further disposed adjacent to the first filtering cavity F1 of the sixth filtering branch 17, and the seventh filtering cavity B7 of the second filtering branch 13 is further disposed adjacent to the third filtering cavity F3 of the sixth filtering branch 17; the fifth filter cavity G5 of the seventh filter branch 18 is further disposed adjacent to the second filter cavity H2 of the eighth filter branch 19, and the first filter cavity B1 of the second filter branch 13 is further disposed adjacent to the first filter cavity H1 of the eighth filter branch 19.

And partial filtering cavities of each filtering branch are adjacently arranged, so that the arrangement space of the filtering cavities can be further reduced, and the size of the filter 10 is reduced.

Optionally, as shown in fig. 1, the first side 111 of the housing is further provided with: a first input port (not shown), a second input port (not shown), a first output port (not shown), a second output port (not shown), a third output port (not shown), and a fourth output port (not shown); the first input port is respectively connected with the first filtering cavity a1 of the first filtering branch 12 and the first filtering cavity C1 of the third filtering branch 14, and the second input port is respectively connected with the first filtering cavity D1 of the fourth filtering branch 15 and the first filtering cavity E1 of the fifth filtering branch 16; the tenth filter cavity a10 of the first filter branch 12 is connected to the first output port, the twelfth filter cavity C12 of the third filter branch 14 is connected to the second output port, the tenth filter cavity D10 of the fourth filter branch 15 is connected to the third output port, and the twelfth filter cavity E12 of the fifth filter branch 16 is connected to the fourth output port.

As shown in fig. 2, the second side 112 of the housing is further provided with: a third input port (not shown), a fourth input port (not shown), a fifth output port (not shown), a sixth output port (not shown), a seventh output port (not shown), and an eighth output port (not shown); the third input port is respectively connected with the first filter cavity B1 of the second filter branch 13 and the first filter cavity F1 of the sixth filter branch 17, and the fourth input port is respectively connected with the first filter cavity G1 of the seventh filter branch 18 and the first filter cavity H1 of the eighth filter branch 19; the tenth filter cavity B10 of the second filter branch 13 is connected to the fifth output port, the twelfth filter cavity F12 of the sixth filter branch 17 is connected to the sixth output port, the tenth filter cavity G10 of the seventh filter branch 18 is connected to the seventh output port, and the twelfth filter cavity H12 of the eighth filter branch 19 is connected to the eighth output port.

Both the input port and the output port can be taps of the filter 10, and input and output of filtering signals of each branch can be realized; and part of the filtering branches share the common port, so that the number of taps can be reduced, the complexity of the filter 10 is reduced, and the cost is saved.

The first filtering branch 12, the second filtering branch 13, the fourth filtering branch 15 and the seventh filtering branch 18 are receiving filtering branches, and the third filtering branch 14, the fifth filtering branch 16, the sixth filtering branch 17 and the eighth filtering branch 19 are transmitting filtering branches.

As shown in fig. 1, in the first filter branch 12, the coupling bandwidth between the first input port of the present embodiment and the first filter cavity a1 is in the range of 38MHz-46 MHz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 29MHz to 37 MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 is in the range of 19MHz-26 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 ranges from 14MHz to 20 MHz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity a5 is in the range of (-14) MHz- (-8) MHz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity A6 ranges from (-4) MHz to 0 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 ranges from 15MHz to 21 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 17MHz to 23 MHz; the coupling bandwidth between the sixth filtering cavity A6 and the seventh filtering cavity A7 ranges from 17MHz to 23 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 15MHz to 21 MHz; the coupling bandwidth between the seventh filter cavity A7 and the ninth filter cavity A9 ranges from 8MHz to 13 MHz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 17MHz to 23 MHz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 ranges from 29MHz to 37 MHz; the coupling bandwidth between the tenth filter cavity a10 and the first output port is in the range of 38MHz-46MHz, which can meet the design requirements.

The resonant frequencies of the first filtering cavity a1 to the tenth filtering cavity a10 of the first filter branch 12 are sequentially in the following ranges: 716MHz-718MHz, 705MHz-707MHz, 717MHz-719MHz, 716MHz-718MHz, 726MHz-728MHz, 716MHz-718 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. 2, in the second filter branch 13, the coupling bandwidth between the second input port of the present embodiment and the first filter cavity B1 is in the range of 38MHz-46 MHz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 29MHz to 37 MHz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 19MHz to 26 MHz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 14MHz to 20 MHz; the coupling bandwidth between the third filter cavity B3 and the fifth filter cavity B5 is in the range of (-14) MHz- (-8) MHz; the coupling bandwidth between the third filter cavity B3 and the sixth filter cavity B6 ranges from (-4) MHz to 0 MHz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 15MHz to 21 MHz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 17MHz to 23 MHz; the coupling bandwidth between the sixth filtering cavity B6 and the seventh filtering cavity B7 ranges from 17MHz to 23 MHz; the coupling bandwidth between the seventh filtering cavity B7 and the eighth filtering cavity B8 ranges from 15MHz to 21 MHz; the coupling bandwidth between the seventh filter cavity B7 and the ninth filter cavity B9 ranges from 8MHz to 13 MHz; the coupling bandwidth between the eighth filter cavity B8 and the ninth filter cavity B9 ranges from 17MHz to 23 MHz; the coupling bandwidth between the ninth filter cavity B9 and the tenth filter cavity B10 ranges from 29MHz to 37 MHz; the coupling bandwidth between the tenth filter cavity B10 and the second output port is in the range of 38MHz-46MHz, 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: 716MHz-718MHz, 700MHz-702MHz, 718MHz-720MHz, 717MHz-719MHz, 728MHz-730MHz, 717MHz-719MHz, 716MHz-718 MHz.

As shown in fig. 1, in the fourth filter branch 15, the coupling bandwidth between the fourth input port of the present embodiment and the first filter cavity D1 is in the range of 38MHz-46 MHz; the coupling bandwidth between the first filter cavity D1 and the second filter cavity D2 ranges from 29MHz to 37 MHz; the coupling bandwidth between the second filter cavity D2 and the third filter cavity D3 is in the range of 19MHz-26 MHz; the coupling bandwidth between the third filter cavity D3 and the fourth filter cavity D4 ranges from 14MHz to 20 MHz; the coupling bandwidth between the third filter cavity D3 and the fifth filter cavity D5 is in the range of (-14) MHz- (-8) MHz; the coupling bandwidth between the third filter cavity D3 and the sixth filter cavity D6 ranges from (-4) MHz to 0 MHz; the coupling bandwidth between the fourth filter cavity D4 and the fifth filter cavity D5 ranges from 15MHz to 21 MHz; the coupling bandwidth between the fifth filter cavity D5 and the sixth filter cavity D6 ranges from 17MHz to 23 MHz; the coupling bandwidth between the sixth filtering cavity D6 and the seventh filtering cavity D7 ranges from 17MHz to 23 MHz; the coupling bandwidth between the seventh filtering cavity D7 and the eighth filtering cavity D8 ranges from 15MHz to 21 MHz; the coupling bandwidth between the seventh filter cavity D7 and the ninth filter cavity D9 ranges from 8MHz to 13 MHz; the coupling bandwidth between the eighth filtering cavity D8 and the ninth filtering cavity D9 ranges from 17MHz to 23 MHz; the coupling bandwidth between the ninth filter cavity D9 and the tenth filter cavity D10 ranges from 29MHz to 37 MHz; the coupling bandwidth between the tenth filter cavity D10 and the fourth output port is in the range of 38MHz-46MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity D1 to the tenth filtering cavity D10 of the first filter branch 12 are sequentially in the following ranges: 716MHz-718MHz, 705MHz-707MHz, 717MHz-719MHz, 716MHz-718MHz, 726MHz-728MHz, 716MHz-718 MHz.

As shown in fig. 2, in the seventh filter branch 18, the coupling bandwidth between the seventh input port of the present embodiment and the first filter cavity G1 is in the range of 38MHz-46 MHz; the coupling bandwidth between the first filtering cavity G1 and the second filtering cavity G2 ranges from 29MHz to 37 MHz; the coupling bandwidth between the second filter cavity G2 and the third filter cavity G3 ranges from 14MHz to 26 MHz; the coupling bandwidth between the third filter cavity G3 and the fourth filter cavity G4 ranges from 18MHz to 24 MHz; the coupling bandwidth between the fourth filter cavity G4 and the fifth filter cavity G5 ranges from 17MHz to 23 MHz; the coupling bandwidth between the fourth filtering cavity G4 and the seventh filtering cavity G7 ranges from (-4) MHz to 0 MHz; the coupling bandwidth between the fifth filtering cavity G5 and the sixth filtering cavity G6 ranges from 15MHz to 21 MHz; the coupling bandwidth between the fifth filtering cavity G5 and the seventh filtering cavity G7 is in the range of (-13) MHz- (-8) MHz; the coupling bandwidth between the sixth filtering cavity G6 and the seventh filtering cavity G7 ranges from 14MHz to 20 MHz; the coupling bandwidth between the seventh filtering cavity G7 and the eighth filtering cavity G8 ranges from 18MHz to 24 MHz; the coupling bandwidth between the eighth filtering cavity G8 and the ninth filtering cavity G9 ranges from 15MHz to 21 MHz; the coupling bandwidth between the eighth filtering cavity G8 and the tenth filtering cavity G10 ranges from 4MHz to 9 MHz; the coupling bandwidth between the ninth filtering cavity G9 and the tenth filtering cavity G10 ranges from 25MHz to 32 MHz; the coupling bandwidth between the tenth filtering cavity G10 and the seventh output port ranges from 38MHz to 46MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity G1 to the tenth filtering cavity G10 of the first filter branch 12 are sequentially in the following ranges: 716MHz-718MHz, 717MHz-719MHz, 705MHz-707MHz, 716MHz-718MHz, 714MHz-716MHz, 727MHz-728MHz, 716MHz-718 MHz.

As shown in fig. 1, in the third filter branch 14, the coupling bandwidth between the third input port of the present embodiment and the first filter cavity C1 is in the range of 45MHz-54 MHz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 ranges from 34MHz to 42 MHz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 ranges from 23MHz to 30 MHz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 ranges from 21MHz to 27 MHz; the coupling bandwidth between the third filter cavity C3 and the fifth filter cavity C6 ranges from 1MHz to 6 MHz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 ranges from 12MHz to 18 MHz; the coupling bandwidth between the fourth filtering cavity C4 and the sixth filtering cavity C6 is in the range of (-18) MHz- (-12) MHz; the coupling bandwidth between the fifth filter cavity C5 and the sixth filter cavity C6 ranges from 14MHz to 20 MHz; the coupling bandwidth between the sixth filter cavity C6 and the seventh filter cavity C7 ranges from 18MHz to 24 MHz; the coupling bandwidth between the sixth filter cavity C6 and the eighth filter cavity C8 ranges from 8MHz to 9 MHz; the coupling bandwidth between the seventh filtering cavity C7 and the eighth filtering cavity C8 ranges from 17MHz to 24 MHz; the coupling bandwidth between the eighth filter cavity C8 and the ninth filter cavity C9 ranges from 16MHz to 22 MHz; the coupling bandwidth between the eighth filtering cavity C8 and the tenth filtering cavity C10 ranges from 7MHz to 12 MHz; the coupling bandwidth between the eighth filter chamber C8 and the eleventh filter chamber C11 ranges from (-11) MHz- (-7) MHz; the coupling bandwidth between the ninth filter chamber C9 and the tenth filter chamber C10 ranges from 26MHz to 33 MHz; the coupling bandwidth between the tenth filter chamber C10 and the eleventh filter chamber C11 ranges from 21MHz to 28 MHz; the coupling bandwidth between the eleventh filter cavity C11 and the twelfth filter cavity C12 ranges from 34MHz to 42 MHz; the coupling bandwidth between the twelfth filter cavity C12 and the third output port ranges from 44MHz to 53MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity C1 to the tenth filtering cavity C10 of the third filter branch 14 are sequentially in the following ranges: 779MHz-781MHz, 777MHz-779MHz, 763MHz-765MHz, 779MHz-781MHz, 790MHz-792MHz, 779MHz-781MHz, 789MHz-791MHz, 775MHz-777MHz, 779MHz-781 MHz.

As shown in fig. 1, in the fifth filter branch 16, the coupling bandwidth between the fifth input port of the present embodiment and the first filter cavity E1 is in the range of 45MHz-54 MHz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 ranges from 34MHz to 42 MHz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 ranges from 23MHz to 30 MHz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 ranges from 21MHz to 27 MHz; the coupling bandwidth between the third filter cavity E3 and the fifth filter cavity E6 ranges from 1MHz to 6 MHz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 ranges from 12MHz to 18 MHz; the coupling bandwidth between the fourth filter cavity E4 and the sixth filter cavity E6 is in the range of (-18) MHz- (-12) MHz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 ranges from 14MHz to 20 MHz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 ranges from 18MHz to 24 MHz; the coupling bandwidth between the sixth filter cavity E6 and the eighth filter cavity E8 ranges from 8MHz to 9 MHz; the coupling bandwidth between the seventh filter cavity E7 and the eighth filter cavity E8 ranges from 17MHz to 24 MHz; the coupling bandwidth between the eighth filter cavity E8 and the ninth filter cavity E9 ranges from 16MHz to 22 MHz; the coupling bandwidth between the eighth filter cavity E8 and the tenth filter cavity E10 ranges from 7MHz to 12 MHz; the coupling bandwidth between the eighth filter cavity E8 and the eleventh filter cavity E11 is in the range of (-11) MHz- (-7) MHz; the coupling bandwidth between the ninth filter cavity E9 and the tenth filter cavity E10 ranges from 26MHz to 33 MHz; the coupling bandwidth between the tenth filter cavity E10 and the eleventh filter cavity E11 ranges from 21MHz to 28 MHz; the coupling bandwidth between the eleventh filter cavity E11 and the twelfth filter cavity E12 ranges from 34MHz to 42 MHz; the coupling bandwidth range between the twelfth filter cavity E12 and the third output port is 44MHz-53MHz, which can meet the design requirement.

The resonant frequencies of the first filter cavity E1 to the twelfth filter cavity E12 of the fifth filter branch 16 are sequentially in the following ranges: 779MHz-781MHz, 777MHz-779MHz, 763MHz-765MHz, 779MHz-781MHz, 790MHz-792MHz, 779MHz-781MHz, 789MHz-791MHz, 775MHz-777MHz, 779MHz-781 MHz.

As shown in fig. 2, in the sixth filter branch 17, the coupling bandwidth between the sixth input port of the present embodiment and the first filter cavity F1 is in the range of 45MHz-54 MHz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 ranges from 34MHz to 42 MHz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 ranges from 16MHz to 22 MHz; the coupling bandwidth between the second filter cavity F2 and the fourth filter cavity F4 is in the range of (-20) MHz- (-15) MHz; the coupling bandwidth between the second filter cavity F2 and the fifth filter cavity F5 ranges from 2MHz to 6 MHz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 ranges from 12MHz to 17 MHz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 ranges from 20MHz to 27 MHz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 ranges from 20MHz to 26 MHz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 ranges from 18MHz to 24 MHz; the coupling bandwidth between the sixth filter cavity E6 and the eighth filter cavity E8 ranges from 8MHz to 13 MHz; the coupling bandwidth between the seventh filter cavity F7 and the eighth filter cavity F8 ranges from 17MHz to 24 MHz; the coupling bandwidth between the eighth filter cavity F8 and the ninth filter cavity F9 ranges from 16MHz to 22 MHz; the coupling bandwidth between the eighth filter cavity F8 and the tenth filter cavity F10 ranges from 7MHz to 11 MHz; the coupling bandwidth between the eighth filter cavity F8 and the eleventh filter cavity F11 is in the range of (-11) MHz- (-7) MHz; the coupling bandwidth between the ninth filter cavity F9 and the tenth filter cavity F10 ranges from 26MHz to 33 MHz; the coupling bandwidth between the tenth filter cavity F10 and the eleventh filter cavity F11 ranges from 21MHz to 28 MHz; the coupling bandwidth between the eleventh filter cavity F11 and the twelfth filter cavity F12 ranges from 34MHz to 42 MHz; the coupling bandwidth range between the twelfth filter cavity F12 and the sixth output port is 45MHz-54MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity F1 to the twelfth filtering cavity F12 of the sixth filter branch 17 are sequentially in the following ranges: 779MHz-781MHz, 762MHz-764MHz, 777MHz-779MHz, 779MHz-781MHz, 790MHz-792MHz, 779MHz-781MHz, 789MHz-791MHz, 775MHz-777MHz, 779MHz-781 MHz.

As shown in fig. 2, in the eighth filter branch 19, the coupling bandwidth between the eighth input port of the present embodiment and the first filter cavity H1 is in the range of 45MHz-54 MHz; the coupling bandwidth between the first filter cavity H1 and the second filter cavity H2 ranges from 34MHz to 42 MHz; the coupling bandwidth between the second filter cavity H2 and the third filter cavity H3 ranges from 16MHz to 22 MHz; the coupling bandwidth between the second filter cavity H2 and the fourth filter cavity H4 is in the range of (-20) MHz- (-15) MHz; the coupling bandwidth between the second filter cavity H2 and the fifth filter cavity H5 ranges from 2MHz to 6 MHz; the coupling bandwidth between the third filter cavity H3 and the fourth filter cavity H4 ranges from 12MHz to 17 MHz; the coupling bandwidth between the fourth filter cavity H4 and the fifth filter cavity H5 ranges from 20MHz to 27 MHz; the coupling bandwidth between the fifth filter cavity H5 and the sixth filter cavity H6 ranges from 20MHz to 26 MHz; the coupling bandwidth between the sixth filtering cavity H6 and the seventh filtering cavity H7 ranges from 18MHz to 24 MHz; the coupling bandwidth between the sixth filtering cavity H6 and the eighth filtering cavity H8 ranges from 8MHz to 13 MHz; the coupling bandwidth between the seventh filtering cavity H7 and the eighth filtering cavity H8 ranges from 17MHz to 24 MHz; the coupling bandwidth between the eighth filter cavity H8 and the ninth filter cavity H9 ranges from 16MHz to 22 MHz; the coupling bandwidth between the eighth filtering cavity H8 and the tenth filtering cavity H10 ranges from 7MHz to 11 MHz; the coupling bandwidth between the eighth filter cavity H8 and the eleventh filter cavity H11 is in the range of (-11) MHz- (-7) MHz; the coupling bandwidth between the ninth filter cavity H9 and the tenth filter cavity H10 ranges from 26MHz to 33 MHz; the coupling bandwidth between the tenth filter cavity H10 and the eleventh filter cavity H11 ranges from 21MHz to 28 MHz; the coupling bandwidth between the eleventh filter cavity H11 and the twelfth filter cavity H12 ranges from 34MHz to 42 MHz; the coupling bandwidth range between the twelfth filter cavity H12 and the eighth output port is 45MHz-54MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity H1 to the twelfth filtering cavity H12 of the eighth filter branch 19 are sequentially in the following ranges: 779MHz-781MHz, 762MHz-764MHz, 777MHz-779MHz, 779MHz-781MHz, 790MHz-792MHz, 779MHz-781MHz, 789MHz-791MHz, 775MHz-777MHz, 779MHz-781 MHz.

As shown in fig. 11, the bandwidth of the first filtering branch 12 is located in a range of 696.5MHz-738MHz, as shown by a frequency band curve S1 in fig. 11, the coupling zeros of the first filtering branch 12 include a, b, and c, and the coupling zeros enable the bandwidth suppression of the frequency point 870MHz to be greater than 24dB, the bandwidth suppression of the frequency point 921MHz to be greater than 38dB, and the bandwidth suppression of the frequency point 925MHz to be greater than 80dB, so that the performance of the first filtering branch 12, such as out-of-band suppression, can be improved.

As shown in fig. 11, the bandwidth of the third filter branch 14 is located in a range from 756MHz to 8046MHz, and as shown by a frequency band curve S2 in fig. 11, the coupling zeros of the third filter branch 14 include d, e, and f, and the coupling zeros enable the bandwidth rejection at the frequency point of 915MHz to be greater than 110dB, and the bandwidth rejection at the frequency point of 965MHz to be greater than 10dB, so that the performance of the third filter branch 14, such as out-of-band rejection, can be improved.

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 parameter are shown as the same coupling zero; the radio frequency parameters of the fourth filtering branch 15, the second filtering branch 13 and the seventh filtering branch 18 are similar to those of the first filtering branch 12, and the radio frequency parameters of the fifth filtering branch 16, the sixth filtering branch 17 and the eighth filtering branch 19 are similar to those of the third filtering branch 14, which are not described herein again.

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 shell is provided with a first side and a second side which are arranged oppositely; the first filtering branch is arranged on the first side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the first filtering branch are formed; and the second filtering branch circuit is arranged on the second side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the second filtering branch circuit are formed. In this way, the first filtering branch and the second filtering branch of the filter of the embodiment of the present application are disposed on the two sides of the housing opposite to each other, so that the arrangement space of the first filtering branch and the arrangement space of the second filtering branch can be overlapped, the area of the housing can be effectively reduced, the size of the filter can be effectively reduced, 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:

the shell is provided with a first side and a second side which are arranged oppositely;

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

and the second filtering branch is arranged on the second side of the shell and consists of ten filtering cavities which are sequentially coupled along a second coupling path, and three coupling zeros of the second filtering branch are formed.

2. The filter of claim 1, wherein the housing has a first direction and a second direction perpendicular to each other, and the second filter cavity of the first filter branch to the tenth filter cavity of the first filter branch are divided into three columns arranged along the first direction;

the second filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row and are sequentially and adjacently arranged along the second direction;

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

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

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

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

capacitive cross coupling is respectively performed between the third filter cavity of the first filter branch and the fifth filter cavity of the first filter branch, and between the third filter cavity of the first filter branch and the sixth filter cavity of the first filter branch to form two capacitive coupling zeros of the first filter branch, and inductive cross coupling is performed between the seventh filter cavity of the first filter branch and the ninth filter cavity of the first filter branch to form one inductive coupling zero of the first filter branch.

3. The filter according to claim 2, further comprising a third filtering branch disposed on the first side of the housing, the third filtering branch consisting of twelve filtering cavities coupled in sequence and forming five coupling zeros of the third filtering branch;

the fourth filtering cavity of the third filtering branch to the eleventh filtering cavity of the third filtering branch are divided into three rows arranged along the first direction, the fourth filtering cavity, the fifth filtering cavity and the ninth filtering cavity of the third filtering branch are in one row and are sequentially and adjacently arranged along the second direction, the sixth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the third filtering branch are in one row and are sequentially and adjacently arranged along the second direction, and the seventh filtering cavity and the eleventh filtering cavity of the third filtering branch are in one row and are sequentially and adjacently arranged along the second direction;

the eighth filter cavity of the third filter branch is also adjacent to the fifth filter cavity of the third filter branch, the ninth filter cavity of the third filter branch, the seventh filter cavity of the third filter branch and the eleventh filter cavity of the third filter branch, and the fourth filter cavity of the third filter branch is also adjacent to the sixth filter cavity of the third filter branch and the third filter cavity of the third filter branch;

the first filter cavities, the second filter cavities and the third filter cavities of the third filter branch are in a row and are sequentially and adjacently arranged along the second direction, the third filter cavities of the third filter branch are close to the middle branching line of the shell in the first direction relative to the fourth filter cavities of the third filter branch, and the projection of the center of the third filter cavities of the third filter branch in the first direction is positioned between the projection of the center of the fourth filter cavities of the third filter branch in the first direction and the projection of the center of the sixth filter cavities of the third filter branch in the first direction;

the twelfth filter cavity of the third filter branch is adjacent to the eleventh filter cavity of the first filter branch, and the center of the twelfth filter cavity of the third filter branch is located on an extension line of a connecting line of the center of the eleventh filter cavity of the third filter branch and the center of the eighth filter cavity of the third filter branch;

capacitive cross coupling is respectively performed between a third filter cavity of the third filter branch and a sixth filter cavity of the third filter branch, between a fourth filter cavity of the third filter branch and the sixth filter cavity of the third filter branch, and between an eighth filter cavity of the third filter branch and a tenth filter cavity of the third filter branch, so as to form three capacitive coupling zeros of the third filter branch, and inductive cross coupling is performed between the sixth filter cavity of the third filter branch and the eighth filter cavity of the third filter branch, and between the eighth filter cavity of the third filter branch and the eleventh filter cavity of the third filter branch, so as to form two inductive coupling zeros of the third filter branch.

4. The filter of claim 3, further comprising:

the fourth filtering branch is arranged on the first side of the shell and consists of ten filtering cavities which are sequentially coupled, and three coupling zeros of the fourth filtering branch are formed;

the first filtering cavity of the fourth filtering branch to the ninth filtering cavity of the fourth filtering branch are divided into three rows arranged along the first direction, the first filtering cavity and the second filtering cavity of the fourth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, the third filtering cavity, the fourth filtering cavity, the seventh filtering cavity and the ninth filtering cavity of the fourth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, and the fifth filtering cavity, the sixth filtering cavity and the eighth filtering cavity of the fourth filtering branch are in a row and are sequentially and adjacently arranged along the second direction;

the third filter cavity of the fourth filter branch is also adjacent to the first filter cavity of the fourth filter branch, the second filter cavity of the fourth filter branch, the fifth filter cavity of the fourth filter branch and the sixth filter cavity of the fourth filter branch, the ninth filter cavity of the fourth filter branch is also adjacent to the eighth filter cavity of the fourth filter branch and the tenth filter cavity of the fourth filter branch, and the ninth filter cavity of the fourth filter branch is close to the middle branching line of the shell in the first direction relative to the tenth filter cavity of the fourth filter branch;

capacitive cross coupling is respectively performed between a third filtering cavity of the fourth filtering branch and a fifth filtering cavity of the fourth filtering branch and between the third filtering cavity of the fourth filtering branch and a sixth filtering cavity of the fourth filtering branch to form two capacitive coupling zeros of the fourth filtering branch, and inductive cross coupling is performed between a seventh filtering cavity of the fourth filtering branch and a ninth filtering cavity of the fourth filtering branch to form one inductive coupling zero of the fourth filtering branch;

the fifth filtering branch is arranged on the first side of the shell, consists of twelve filtering cavities which are sequentially coupled, and forms five coupling zeros of the fifth filtering branch;

the third filtering cavity of the fifth filtering branch to the twelfth filtering cavity of the fifth filtering branch are divided into four rows arranged along the first direction, the fourth filtering cavity and the fifth filtering cavity of the fifth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, the third filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the fifth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, the ninth filtering cavity, the eighth filtering cavity and the twelfth filtering cavity of the fifth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, and the tenth filtering cavity and the eleventh filtering cavity of the fifth filtering branch are in a row and are sequentially and adjacently arranged along the second direction;

the sixth filter cavity of the fifth filter branch is also adjacent to the fourth filter cavity of the fifth filter branch, the fifth filter cavity of the fifth filter branch, the eighth filter cavity of the fifth filter branch and the ninth filter cavity of the fifth filter branch, and the eighth filter cavity of the fifth filter branch is also adjacent to the tenth filter cavity of the fifth filter branch and the eleventh filter cavity of the fifth filter branch;

the first filter cavity, the second filter cavity and the third filter cavity of the fifth filter branch are sequentially and adjacently arranged, the second filter cavity of the fifth filter branch is close to the middle branching line of the shell in the first direction relative to the third filter cavity of the fifth filter branch, and the projection of the center of the first filter cavity of the fifth filter cavity in the first direction is located between the projection of the center of the third filter cavity of the fifth filter branch in the first direction and the projection of the center of the third filter cavity of the fifth filter branch in the first direction, the projection of the center of the second filter cavity of the fifth filter cavity in the second direction is located between the projection of the center of the third filter cavity of the fifth filter branch in the second direction and the projection of the center of the first filter cavity of the fifth filter branch in the second direction;

capacitive cross coupling is respectively performed between a third filter cavity of the fifth filter branch and a sixth filter cavity of the fifth filter branch, between a fourth filter cavity of the fifth filter branch and a sixth filter cavity of the fifth filter branch, and between an eighth filter cavity of the fifth filter branch and a tenth filter cavity of the fifth filter branch, so as to form three capacitive coupling zeros of the fifth filter branch, and inductive cross coupling is performed between the sixth filter cavity of the fifth filter branch and the eighth filter cavity of the fifth filter branch, and between the eighth filter cavity of the fifth filter branch and the eleventh filter cavity of the fifth filter branch, so as to form two inductive coupling zeros of the fifth filter branch.

5. The filter according to claim 4, wherein the first filter cavity of the first filter branch is disposed adjacent to the first filter cavity of the third filter branch, the eighth filter cavity of the first filter branch is disposed adjacent to the second filter cavity of the third filter branch, the ninth filter cavity of the first filter branch is disposed adjacent to the third filter cavity of the third filter branch, and the tenth filter cavity of the first filter branch is disposed adjacent to the sixth filter cavity of the third filter branch;

a fifth filter cavity of the fifth filter branch is adjacent to a seventh filter cavity of the third filter branch, an eleventh filter cavity of the third filter branch and a twelfth filter cavity of the third filter branch;

and the first filter cavity of the fifth filter branch is adjacent to the fifth filter cavity of the first filter branch and the second filter cavity of the fourth filter branch.

6. The filter according to claim 1, wherein the housing has a first direction and a second direction perpendicular to each other, the fourth filter cavity of the second filter branch to the tenth filter cavity of the first filter branch are divided into two rows arranged along the first direction, the fourth filter cavity and the seventh filter cavity of the second filter branch are arranged in one row and sequentially adjacent to each other along the second direction, and the fifth filter cavity, the sixth filter cavity, the eighth filter cavity, the ninth filter cavity and the tenth filter cavity of the second filter branch are arranged in one row and sequentially adjacent to each other along the second direction;

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

the distances from the center of the first filter cavity of the second filter branch, the center of the third filter cavity of the second filter branch, the center of the second filter cavity of the second filter branch and the center of the fourth filter cavity of the second filter branch to the median line of the shell in the first direction are sequentially reduced, and the distances from the center of the second filter cavity of the second filter branch, the center of the first filter cavity of the second filter branch, the center of the fourth filter cavity of the second filter branch and the center of the third filter cavity of the second filter branch to the median line of the shell in the second direction are sequentially reduced;

capacitive cross coupling is respectively performed between a fourth filtering cavity of the second filtering branch and a sixth filtering cavity of the second filtering branch and between the fourth filtering cavity of the second filtering branch and a seventh filtering cavity of the second filtering branch to form two capacitive coupling zeros of the second filtering branch, and inductive cross coupling is performed between the first filtering cavity of the second filtering branch and the third filtering cavity of the second filtering branch to form one inductive coupling zero of the second filtering branch.

7. The filter according to claim 6, further comprising a sixth filtering branch disposed on the second side of the housing, the sixth filtering branch being composed of twelve filtering cavities coupled in sequence and forming five coupling zeros of the sixth filtering branch;

the seventh filtering cavity of the sixth filtering branch to the twelfth filtering cavity of the sixth filtering branch are divided into three rows arranged along the first direction, the seventh filtering cavity, the eleventh filtering cavity and the twelfth filtering cavity of the sixth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, the eighth filtering cavity and the tenth filtering cavity of the sixth filtering branch are in a row and are sequentially and adjacently arranged along the second direction, and the ninth filtering cavity of the sixth filtering branch is in a row;

the eighth filtering cavity of the sixth filtering branch is also adjacent to the sixth filtering cavity of the sixth filtering branch, the seventh filtering cavity of the sixth filtering branch, the eleventh filtering cavity of the sixth filtering branch and the ninth filtering cavity of the sixth filtering branch, the sixth filter cavity of the sixth filter branch is also arranged adjacent to the fifth filter cavity of the sixth filter branch, the distances from the center of the fifth filter cavity of the sixth filter branch, the center of the sixth filter cavity of the sixth filter branch and the center of the eighth filter cavity of the sixth filter branch to the median line of the shell in the first direction are sequentially reduced, distances from the center of the eighth filter cavity of the sixth filter branch, the center of the sixth filter cavity of the sixth filter branch and the center of the fifth filter cavity of the sixth filter branch to the middle branching line of the shell in the second direction are sequentially reduced;

the fifth filter cavity of the sixth filter branch is respectively adjacent to the second filter cavity of the sixth filter branch and the fourth filter cavity of the sixth filter branch, the third filter cavity of the sixth filter cavity is respectively adjacent to the fourth filter cavity of the sixth filter branch and the first filter cavity of the sixth filter branch, the first filter cavity of the sixth filter branch is also adjacent to the second filter cavity of the sixth filter branch, the center of the first filter cavity of the sixth filter branch, the center of the fifth filter cavity of the sixth filter branch, the center of the third filter cavity of the sixth filter branch and the center of the fourth filter cavity of the sixth filter branch are sequentially reduced from the casing in the middle branching line in the first direction, and the distances between the center of the second filter cavity of the sixth filter branch and the middle branching line in the first direction are sequentially reduced, The distance between the projection of the center of the first filter cavity of the sixth filter branch, the center of the fifth filter cavity of the sixth filter branch, the center of the third filter cavity of the sixth filter branch and the center of the fourth filter cavity of the sixth filter branch in the first direction and the median line of the shell in the first direction is reduced in sequence;

capacitive cross coupling is respectively performed between the second filter cavity of the sixth filter branch and the fourth filter cavity of the sixth filter branch, between the second filter cavity of the sixth filter branch and the fifth filter cavity of the sixth filter branch, between the sixth filter cavity of the sixth filter branch and the eighth filter cavity of the sixth filter branch, and between the eighth filter cavity of the sixth filter branch and the eleventh filter cavity of the sixth filter branch, so as to form four capacitive coupling zeros of the sixth filter branch, and inductive cross coupling is performed between the eighth filter cavity of the sixth filter branch and the tenth filter cavity of the sixth filter branch, so as to form one inductive coupling zero of the sixth filter branch.

8. The filter of claim 7, further comprising: the seventh filtering branch is arranged on the second side of the shell, consists of ten filtering cavities which are sequentially coupled, and forms three coupling zeros of the seventh filtering branch;

the third filtering cavity of the seventh filtering branch to the tenth filtering cavity of the seventh filtering branch are divided into two rows arranged along the first direction, the third filtering cavity, the fourth filtering cavity, the seventh filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the seventh filtering branch are arranged in a row and are sequentially and adjacently arranged along the second direction, the fifth filtering cavity, the sixth filtering cavity and the ninth filtering cavity of the seventh filtering branch are arranged in a row and are sequentially and adjacently arranged along the second direction, the seventh filtering cavity of the seventh filtering branch is further arranged adjacently to the fifth filtering cavity of the seventh filtering branch and the sixth filtering cavity of the seventh filtering branch, and the tenth filtering cavity of the seventh filtering branch is further arranged adjacently to the ninth filtering cavity of the seventh filtering branch;

the second filter cavity of the seventh filter branch is further disposed adjacent to the first filter cavity of the seventh filter branch and the third filter cavity of the seventh filter branch, a projection of a center of the second filter cavity of the seventh filter branch in the first direction is located between a projection of a center of the first filter cavity of the seventh filter branch in the first direction and a projection of the third filter cavity of the seventh filter branch in the first direction, and a projection of a center of the first filter cavity of the seventh filter branch in the second direction is located between a projection of a center of the second filter cavity of the seventh filter branch in the second direction and a projection of the third filter cavity of the seventh filter branch in the second direction;

capacitive cross coupling is respectively performed between a fourth filtering cavity of the seventh filtering branch and a seventh filtering cavity of the seventh filtering branch and between a fifth filtering cavity of the seventh filtering branch and a seventh filtering cavity of the seventh filtering branch to form two capacitive coupling zeros of the seventh filtering branch, and inductive cross coupling is performed between an eighth filtering cavity of the seventh filtering branch and a tenth filtering cavity of the seventh filtering branch to form one inductive coupling zero of the seventh filtering branch;

the eighth filtering branch is arranged on the second side of the shell, consists of twelve filtering cavities which are sequentially coupled, and forms five coupling zeros of the eighth filtering branch;

the seventh filtering cavity of the eighth filtering branch to the twelfth filtering cavity of the eighth filtering branch are divided into three rows arranged along the first direction, the seventh filtering cavity, the eleventh filtering cavity and the twelfth filtering cavity of the eighth filtering branch are in one row and are sequentially and adjacently arranged along the second direction, the eighth filtering cavity and the tenth filtering cavity of the eighth filtering branch are in one row and are sequentially and adjacently arranged along the second direction, and the ninth filtering cavity of the eighth filtering branch is in one row;

the eighth filter cavity of the eighth filter branch is further adjacent to a ninth filter cavity of the eighth filter branch, a seventh filter cavity of the eighth filter branch, an eleventh filter cavity of the eighth filter branch and an eighth filter cavity of the eighth filter branch, the sixth filter cavity of the eighth filter branch is respectively adjacent to the eighth filter cavity of the eighth filter branch, the fourth filter cavity of the eighth filter branch and the sixth filter cavity of the eighth filter branch, and the third filter cavity of the eighth filter branch, the second filter cavity of the eighth filter branch and the first filter cavity of the eighth filter branch are arranged two by two;

capacitive cross coupling is respectively performed between the second filter cavity of the eighth filter branch and the fourth filter cavity of the eighth filter branch, between the second filter cavity of the eighth filter branch and the fifth filter cavity of the eighth filter branch, between the sixth filter cavity of the eighth filter branch and the eighth filter cavity of the eighth filter branch, and between the eighth filter cavity of the eighth filter branch and the eleventh filter cavity of the eighth filter branch, so as to form four capacitive coupling zeros of the fifth filter branch, and inductive cross coupling is performed between the eighth filter cavity of the eighth filter branch and the tenth filter cavity of the eighth filter branch, so as to form one inductive coupling zero of the eighth filter branch.

9. The filter according to claim 8, wherein the filter cavity of a part of the second filter branch and the filter cavity of a part of the seventh filter branch are located between the sixth filter branch and the eighth filter branch;

the tenth filter cavity of the second filter branch is respectively adjacent to the fourth filter cavity of the sixth filter branch, the eighth filter cavity of the seventh filter branch and the eighth filter cavity of the seventh filter branch, the third filter cavity of the second filter branch is also adjacent to the first filter cavity of the sixth filter branch, and the seventh filter cavity of the second filter branch is also adjacent to the third filter cavity of the sixth filter branch;

and a fifth filter cavity of the seventh filter branch is also arranged adjacent to a second filter cavity of the eighth filter branch, and a first filter cavity of the second filter branch is also arranged adjacent to a first filter cavity of the eighth filter 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.