CN211125975U

CN211125975U - Filter and communication equipment

Info

Publication number: CN211125975U
Application number: CN201922429098.3U
Authority: CN
Inventors: 周峰; 钟志波; 林海鑫; 王磊
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Anhui Tatfook Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-07-28
Anticipated expiration: 2029-12-27

Abstract

The application discloses a filter and communication equipment. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a first coupling path, and at least two inductive coupling zeros of the first filtering branch are formed; the second filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a second coupling path, and at least two inductive coupling zeros of the second filtering branch are formed; the first filtering branches are symmetrically distributed along a midline of the shell in the first direction. By the method, the process can be simplified, the consistency of materials is improved, the cost is saved, and the temperature drift is reduced.

Description

Filter and communication equipment

Technical Field

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

Background

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

The inventor of the application finds that the production and debugging process of the existing filter is increased along with the increase of the filtering branches, the cost is higher, and the material types are increased along with the increase of the filtering branches, and the cost is higher.

SUMMERY OF THE UTILITY MODEL

The application provides a filter and communication equipment to simplify technology, improve the material uniformity, practice thrift the cost, reduce the temperature drift.

In order to solve the technical problem, the application adopts a technical scheme that: a filter is provided. The filter includes: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a first coupling path, and at least two inductive coupling zeros of the first filtering branch are formed; the second filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a second coupling path, and at least two inductive coupling zeros of the second filtering branch are formed; the first filtering branches are symmetrically distributed along a midline of the shell in the first direction.

The beneficial effects of the embodiment of the application are that: different from the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; the first filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a first coupling path, and at least two inductive coupling zeros of the first filtering branch are formed; the second filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a second coupling path, and at least two inductive coupling zeros of the second filtering branch are formed; the first filtering branches are symmetrically distributed along a midline of the shell in the first direction. The first filtering branch and the second filtering branch of the filter of the embodiment of the application adopt symmetrical structures, so that the cavity arrangement of the filter is more regular, the production and debugging are convenient, the process can be simplified, and the cost is saved; and the coupling zero points of the first filtering branch and the second filtering branch are inductive coupling zero points, so that the consistency of materials can be improved, the types of the materials can be reduced, and the temperature drift of the first filtering branch and the second filtering branch can be reduced.

Drawings

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

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

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

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

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

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

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

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

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

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

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

FIG. 11 is a schematic diagram of an embodiment of a filter according to the present application;

FIG. 12 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application;

FIG. 13 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application;

FIG. 14 is a schematic diagram of a topology of a seventh filtering branch in an embodiment of the filter of the present application;

FIG. 15 is a schematic diagram of a topology of an eighth filtering branch in an embodiment of the filter of the present application;

FIG. 16 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

FIG. 17 is a schematic diagram of an embodiment of a filter according to the present application;

FIG. 18 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application;

FIG. 19 is a schematic diagram of a topology of a second filtering branch in an embodiment of a filter according to the present application;

FIG. 20 is a schematic diagram of a topology of a third filtering branch in an embodiment of a filter according to the present application;

FIG. 21 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of a filter according to the present application;

FIG. 22 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

fig. 23 is a schematic structural diagram of an embodiment of the communication device of the present application.

Detailed Description

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

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

The present application first proposes a filter, as shown in fig. 1 to 10, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 2 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application; FIG. 3 is a schematic diagram of a topology of a second filtering branch in an embodiment of the filter of the present application; FIG. 4 is a schematic diagram of a topology of a third filtering branch in an embodiment of the filter of the present application; FIG. 5 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of the filter of the present application; FIG. 6 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application; FIG. 7 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application; FIG. 8 is a schematic diagram of a topology of a seventh filtering branch in an embodiment of the filter of the present application; FIG. 9 is a schematic diagram of a topology of an eighth filtering branch in an embodiment of the filter of the present application; FIG. 10 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes: the filter comprises a shell 11, a first filtering branch 12 and a second filtering branch 13, wherein the shell 11 has a first direction x and a second direction y which are perpendicular to each other; the first filtering branch 12 is arranged on the housing 11, the first filtering branch 12 is composed of nine filtering cavities a1-a9 coupled in sequence along a first coupling path, and the nine filtering cavities a1-a9 of the first filtering branch 12 form three inductive coupling zeros of the first filtering branch 12; the second filtering branch 13 is disposed on the housing 11, the second filtering branch 13 is composed of nine filtering cavities B1-B9 coupled in sequence along the second coupling path, and the nine filtering cavities B1-B9 of the second filtering branch 13 form three inductive coupling zeros of the second filtering branch 13.

As shown in fig. 1, the nine filter cavities a1-a9 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 and a ninth filtering cavity A9; the nine filter cavities B1-B9 of the second filter branch 13 comprise: a first filter cavity B1, a second filter cavity B2, a third filter cavity B3, a fourth filter cavity B4, a fifth filter cavity B5, a sixth filter cavity B6, a seventh filter cavity B7, an eighth filter cavity B8 and a ninth filter cavity B9.

Different from the prior art, the first filtering branch 12 and the second filtering branch 13 of the filter 10 of the present embodiment adopt a symmetrical structure, so that the cavity arrangement of the filter 10 is more regular, the production and the debugging are facilitated, the process can be simplified, and the cost can be saved; and the coupling zero points of the first filtering branch 12 and the second filtering branch 13 are inductive coupling zero points, which can improve the consistency of materials, reduce the types of materials, and reduce the temperature drift of the first filtering branch 12 and the second filtering branch 13.

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

Alternatively, as shown in fig. 1, the nine filter cavities a1-a9 of the first filter branch 12 are divided into two columns arranged along the first direction x; the first filtering cavity a1, the second filtering cavity a2, the third filtering cavity A3 and the fourth filtering cavity a4 of the first filtering branch 12 are in a row and are sequentially and adjacently arranged along the second direction y; the fifth filtering cavity a5, the sixth filtering cavity a6, the seventh filtering cavity a7, the eighth filtering cavity A8 and the ninth filtering cavity a9 of the first filtering branch 12 are in a row and are sequentially and adjacently arranged along the second direction y; the second filter cavity a2 of the first filter branch 12 is further disposed adjacent to the seventh filter cavity a7 of the first filter branch 12 and the eighth filter cavity A8 of the first filter branch 12, respectively.

As can be seen from the above analysis, the nine filter cavities a1-a9 of the first filter branch 12 are arranged in two rows, which can shorten the arrangement space of the first filter branch 12 in the second direction y; and two filter chambers are adjacently arranged, a plurality of filter chambers in each row are sequentially adjacently arranged, and the two rows of filter chambers are staggered, so that the arrangement space of the first filter branch 12 can be reduced.

Specifically, the second filtering cavity a2 and the third filtering cavity A3, the third filtering cavity A3 and the fourth filtering cavity a4, the fifth filtering cavity a5 and the sixth filtering cavity a6, the sixth filtering cavity a6 and the seventh filtering cavity a7, and the seventh filtering cavity a7 and the eighth filtering cavity A8 of the first filtering branch 12 are respectively arranged in an intersecting manner, so that a partition wall is not required to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is arranged on the partition wall, so that the material can be reduced, and the processing process can be simplified.

Optionally, three inductive coupling zeros of the first filtering branch 12 are formed by inductive cross-coupling between the third filtering cavity A3 of the first filtering branch 12 and the sixth filtering cavity a6 of the first filtering branch 12, between the third filtering cavity A3 of the first filtering branch 12 and the seventh filtering cavity a7 of the first filtering branch 12, and between the fourth filtering cavity a4 of the first filtering branch 12 and the sixth filtering cavity a6 of the first filtering branch 12, respectively.

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.

In general, the mode of implementing the inductive coupling zero point is a window, and a metal coupling rib is disposed on the window, that is, a window and a metal coupling rib (equivalent to the capacitor L1 shown in fig. 2) are disposed between the third filter cavity A3 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, a window and a metal coupling rib (equivalent to the capacitor L2 shown in fig. 2) are disposed between the third filter cavity A3 of the first filter branch 12 and the seventh filter cavity a7 of the first filter branch 12, a window and a metal coupling rib (equivalent to the capacitor L3 shown in fig. 2) are disposed between the fourth filter cavity a4 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, in this embodiment, the inductive cross coupling is implemented by the metal coupling rib, and the metal coupling rib is subject to a small change of an external temperature, so that a temperature drift of the first filter branch 12 can be reduced.

As shown in fig. 1, the nine filter cavities B1-B9 of the second filter branch 13 are divided into two columns arranged along the first direction x; the first filtering cavity B1, the second filtering cavity B2, the third filtering cavity B3 and the fourth filtering cavity B4 of the second filtering 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 seventh filtering cavity B7, the eighth filtering cavity B8 and the ninth filtering cavity B9 of the second filtering branch 13 are in a row and are sequentially and adjacently arranged along the second direction y; the second filter cavity B2 of the second filter branch 13 is further disposed adjacent to the seventh filter cavity B7 of the second filter branch 13 and the eighth filter cavity B8 of the second filter branch 13, respectively.

As can be seen from the above analysis, the nine filter cavities B1-B9 of the second filter branch 13 are arranged in two rows, which can shorten the arrangement space of the second filter branch 13 in the second direction y; and two filter chambers are adjacently arranged, a plurality of filter chambers in each row are sequentially adjacently arranged, and the two rows of filter chambers are arranged in a staggered manner, so that the arrangement space of the second filter branch 13 can be reduced.

Specifically, the second filtering cavity B2 and the third filtering cavity B3, the third filtering cavity B3 and the fourth filtering cavity B4, the fifth filtering cavity B5 and the sixth filtering cavity B6, the sixth filtering cavity B6 and the seventh filtering cavity B7, and the seventh filtering cavity B7 and the eighth filtering cavity B8 of the second filtering branch 13 are respectively arranged in an intersecting manner, so that a partition wall is not required to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is arranged on the partition wall, so that the material can be reduced, and the processing process can be simplified.

Inductive cross coupling is respectively performed between the third filter cavity B3 of the second filter branch 13 and the sixth filter cavity B6 of the second filter branch 13, between the third filter cavity B3 of the second filter branch 13 and the seventh filter cavity B7 of the second filter branch 13, and between the fourth filter cavity B4 of the second filter branch 13 and the sixth filter cavity B6 of the second filter branch 13, so as to form three inductive coupling zeros of the second filter branch 13.

As shown in fig. 3, a window and a metal coupling rib (equivalent to the capacitor L4 shown in fig. 3) are disposed between the third filter cavity B3 and the sixth filter cavity B6 of the second filter branch 13, a window and a metal coupling rib (equivalent to the capacitor L5 shown in fig. 3) are disposed between the third filter cavity B3 and the seventh filter cavity B7 of the second filter branch 13, a window and a metal coupling rib (equivalent to the capacitor L6 shown in fig. 3) are disposed between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 13, and the inductive cross coupling is achieved by the metal coupling rib, so that the metal coupling rib is subjected to a small change in external temperature, and the temperature drift of the second filter branch 13 can be reduced.

Optionally, as shown in fig. 1, the filter 10 further includes a third filtering branch 14 disposed on the housing 11, the third filtering branch 14 is composed of nine filtering cavities C1-C9 coupled in sequence along a third coupling path, and the nine filtering cavities C1-C9 of the third filtering branch 14 form three inductive coupling zeros of the third filtering branch 14.

Wherein the nine filter cavities C1-C9 of the third filter branch 14 include: a first filter cavity C1, a second filter cavity C2, a third filter cavity C3, a fourth filter cavity C4, a fifth filter cavity C5, a sixth filter cavity C6, a seventh filter cavity C7, an eighth filter cavity C8 and a ninth filter cavity C9.

The nine filter cavities C1-C9 of the third filter branch 14 are divided into two columns arranged along the first direction x; 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 fourth filtering cavity C4, the fifth filtering cavity C5, the sixth filtering cavity C6, the seventh filtering cavity C7, the eighth filtering cavity C8 and the ninth filtering cavity C9 of the third filtering 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 further disposed adjacent to the fourth filter cavity C4 of the first filter branch 12 and the fifth filter cavity C5 of the first filter branch 12, respectively.

From the above analysis, it can be seen that the nine filter cavities C1-C9 of the third filter branch 14 are arranged in two rows, which can shorten the arrangement space of the third filter branch 14 in the second direction y; and two rows of filtering cavities are adjacently arranged, a plurality of filtering cavities in each row are sequentially adjacently arranged, and the two rows of filtering cavities are staggered, so that the arrangement space of the third filtering branch 14 can be reduced.

Specifically, the first filter cavity C1, the second filter cavity C2 and the third filter cavity C3 are sequentially arranged in an intersecting manner, the fourth filter cavity C4, the fifth filter cavity C5, the sixth filter cavity C6, the seventh filter cavity C7, the eighth filter cavity C8 and the ninth filter cavity C9 are sequentially arranged in an intersecting manner, a partition wall needs to be arranged between the two coupled filter cavities in the conventional filter through the intersecting arrangement of the filter cavities, and then a coupling window is arranged on the partition wall, so that materials can be reduced, and the processing technology is simplified.

Optionally, inductive cross-coupling is performed between the second filter cavity C2 of the third filter branch 14 and the fifth filter cavity C5 of the third filter branch 14, between the second filter cavity C2 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14, and between the third filter cavity C3 of the third filter branch 14 and the fifth filter cavity C5 of the third filter branch 14, respectively, so as to form three inductive coupling zeros of the third filter branch 14.

As shown in fig. 4, a window and a metal coupling rib (equivalent to the capacitor L7 shown in fig. 4) are disposed between the second filter cavity C2 and the fifth filter cavity C5, a window and a metal coupling rib (equivalent to the capacitor L8 shown in fig. 4) are disposed between the second filter cavity C2 and the sixth filter cavity C6, a window and a metal coupling rib (equivalent to the capacitor L9 shown in fig. 4) are disposed between the third filter cavity C3 and the fifth filter cavity C5, the coupling zeros of the third filter branch 14 are all inductive coupling zeros, which can improve the consistency of the materials and reduce the types of the materials, and the inductive cross coupling is realized by the metal coupling ribs in this embodiment, so that the metal coupling ribs are subjected to small changes in the external temperature, and the temperature drift of the third filter branch 14 can be reduced.

Optionally, as shown in fig. 1, the filter 10 further includes a fourth filtering branch 15 disposed on the housing 11, the fourth filtering branch 15 is composed of nine filtering cavities D1-D9 coupled in sequence along a fourth coupling path, and the nine filtering cavities D1-D9 of the fourth filtering branch 15 form three inductive coupling zeros of the fourth filtering branch 15.

The nine filter cavities D1-D9 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 and a ninth filter cavity D9.

As shown in fig. 1, the first filter cavity D1 through the eighth filter cavity D8 of the fourth filter branch 15 are divided into two columns arranged along the first direction x; the first filter cavity D1, the second filter cavity D2, and the third filter cavity D3 of the fourth filter branch 15 are in a row and are sequentially and adjacently arranged along the second direction y; the fourth filtering cavity D4, the fifth filtering cavity D5, the sixth filtering cavity D6, the seventh filtering cavity D7 and the eighth filtering cavity D8 of the fourth filtering 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 also respectively adjacent to the fourth filtering cavity D4 of the fourth filtering branch 15 and the fifth filtering cavity D5 of the fourth filtering branch 15; and the ninth filter cavity D9 of the fourth filter branch 15 is close to the middle division line of the housing 11 in the first direction x relative to the eighth filter cavity D8 of the fourth filter branch 15.

From the above analysis, it can be known that the nine filter cavities D1-D9 of the fourth filter branch 15 are arranged in two rows, which can shorten the arrangement space of the fourth filter branch 15 in the second direction y; two rows of filtering cavities are adjacently arranged, a plurality of filtering cavities in each row are sequentially adjacently arranged, and the two rows of filtering cavities are staggered, so that the arrangement space of the fourth filtering branch 15 can be reduced; in addition, the cavity arrangement structure can prevent the two rows of filter cavities of the ninth filter cavity D9 and the fourth filter branch 15 from being arranged in a shape like a Chinese character 'yi', and can reduce the arrangement space of the fourth filter branch 15 in the second direction y.

As shown in fig. 1, the first filter cavity D1, the second filter cavity D2 and the third filter cavity D3 are sequentially arranged in an intersecting manner, the fourth filter cavity D4, the fifth filter cavity D5, the sixth filter cavity D6, the seventh filter cavity D7, the eighth filter cavity D8 and the ninth filter cavity D9 are sequentially arranged in an intersecting manner, and by the intersecting arrangement of the filter cavities, a partition wall is prevented from being required to be arranged between the two coupled filter cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that materials can be reduced, and the processing technology is simplified.

Optionally, inductive cross-coupling is performed between the second filter cavity D2 of the fourth filter branch 15 and the fifth filter cavity D5 of the fourth filter branch 15, between the second filter cavity D2 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, and between the third filter cavity D3 of the fourth filter branch 15 and the fifth filter cavity D5 of the fourth filter branch 15, respectively, so as to form three inductive coupling zeros of the fourth filter branch 15.

As shown in fig. 5, a window and a metal coupling rib (equivalent to the capacitor L10 shown in fig. 5) are disposed between the second filter cavity D2 and the fifth filter cavity D5, a window and a metal coupling rib (equivalent to the capacitor L11 shown in fig. 5) are disposed between the second filter cavity D2 and the sixth filter cavity D6, a window and a metal coupling rib (equivalent to the capacitor L12 shown in fig. 5) are disposed between the third filter cavity D3 and the fifth filter cavity D5, all the coupling zeros of the fourth filter branch 15 are inductive coupling zeros, which can improve material consistency and reduce material types, and the inductive cross coupling is realized by the metal coupling ribs in this embodiment, so that the metal coupling ribs are subjected to small changes in external temperature, and can reduce temperature drift of the fourth filter branch 15.

Optionally, as shown in fig. 1, the filter 10 further includes a fifth filtering branch 16 disposed on the housing 11, and the fifth filtering branch 16 is composed of eleven filtering cavities E1-E11 coupled in sequence along a fifth coupling path and forms three coupling zeros of the fifth filtering branch 16. The coupling zero of the fifth filtering branch 16 can improve the out-of-band rejection and other characteristics of the signal of the fifth filtering branch 16.

The second filter cavity E2, the third filter cavity E3, the fifth filter cavity E5 and the sixth filter cavity E6 of the fifth filter branch 16 are arranged in a square shape, the fourth filter cavity E4 of the fifth filter branch 16 is located in the center of the square shape, the fourth filter cavity E4 of the fifth filter branch 16 is respectively adjacent to the second filter cavity E2, the third filter cavity E3, the fifth filter cavity E5 and the sixth filter cavity E6 of the fifth filter branch 16, and the second filter cavity E2 of the fifth filter branch 16 is adjacent to the third filter cavity E3 of the fifth filter branch 16; the fifth filtering cavity E5, the sixth filtering cavity E6, the seventh filtering cavity E7 and the eighth filtering cavity E8 of the fifth filtering branch 16 are adjacent in pairs and are arranged in a diamond shape; the seventh filtering cavity E7, the eighth filtering cavity E8, the ninth filtering cavity E9 and the tenth filtering cavity E10 of the fifth filtering branch 16 are adjacent in pairs and arranged in a diamond shape; the eleventh filter cavity E11 of the fifth filter branch 16 is respectively disposed adjacent to the ninth filter cavity E9 of the fifth filter branch 16 and the tenth filter cavity E10 of the fifth filter branch 16, and projections of the ninth filter cavity E9 and the tenth filter cavity E10 of the fifth filter branch 16 in the second direction y overlap; the first filter chamber E1 of the fifth filter branch 16 is closer to the midline of the housing 11 in the first direction x than the third filter chamber E3 of the fifth filter branch 16. The cavity arrangement structure is relatively regular, so that the cavity arrangement of the fifth filtering branch 16 is more compact, and the arrangement space of the fifth filtering branch 16 can be reduced.

The seventh filtering cavity E7 and the tenth filtering cavity E10, and the tenth filtering cavity E10 and the eleventh filtering cavity E11 of the fifth filtering branch 16 are respectively arranged in an intersecting manner, and by the intersecting arrangement of the filtering cavities, a partition wall is not required to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that materials can be reduced, and the processing process can be simplified.

The capacitive cross coupling is respectively performed between the second filter cavity E2 of the fifth filter branch 16 and the fourth filter cavity E4 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 seventh filter cavity E7 of the fifth filter branch 16 and the ninth filter cavity E9 of the fifth filter branch 16, so as to form three capacitive coupling zeros of the fifth filter branch 16.

The coupling zero points of the fifth filtering branch 16 are capacitive coupling zero points, so that the consistency of materials can be improved, the types of the materials are reduced, the processing is convenient, and the installation efficiency can be improved.

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. 6, that is, a flying bar (equivalent to the capacitor C1 shown in fig. 6) is provided between the second filter cavity E2 and the fourth filter cavity E4, a flying bar (equivalent to the capacitor C2 shown in fig. 6) is provided between the fourth filter cavity E4 and the sixth filter cavity E6, and a flying bar (equivalent to the capacitor C3 shown in fig. 6) is provided between the seventh filter cavity E7 and the ninth filter cavity E9.

Optionally, as shown in fig. 1, the filter 10 further includes a sixth filtering branch 17 disposed on the housing 11, where the sixth filtering branch 17 is composed of eleven filtering cavities F1-F11 coupled in sequence along a sixth coupling path and forms three coupling zeros of the sixth filtering branch 17. The coupling zero of the sixth filtering branch 17 can improve the out-of-band rejection and other characteristics of the signal of the sixth filtering branch 17.

Wherein, the first filter cavity F1, the second filter cavity F2, the third filter cavity F3, and the fourth filter cavity F4 of the sixth filter branch 17 are adjacent in pairs and arranged in a diamond shape, the third filter cavity F3, the fourth filter cavity F4, the fifth filter cavity F5, and the sixth filter cavity F6 of the sixth filter branch 17 are adjacent in pairs and arranged in a diamond shape, the fifth filter cavity F5, the sixth filter cavity F6, the seventh filter cavity F7, and the eighth filter cavity F8 of the sixth filter branch 17 are adjacent in pairs and arranged in a diamond shape, the seventh filter cavity F7, the eighth filter cavity F8, the ninth filter cavity F9, and the tenth filter cavity F10 of the sixth filter branch 17 are adjacent in pairs and arranged in a diamond shape, wherein, the first filter cavity F1, the sixth filter cavity F84, and the ninth filter cavity F4642 of the sixth filter branch 17 overlap in the projection direction of the ninth filter cavity F8, and the ninth filter cavity F8 are overlapped on the third filter cavity F4617, the projections of the second filter cavity F2, the fifth filter cavity F5 and the tenth filter cavity F10 of the sixth filter branch 17 in the second direction y overlap; the eleventh filtering cavity F11 of the sixth filtering branch 17 is disposed adjacent to the ninth filtering cavity F9 and the tenth filtering cavity F10 of the sixth filtering branch 17, and the eleventh filtering cavity F11 of the sixth filtering branch 17 is close to the center-dividing line of the housing 11 in the second direction y 1 with respect to the tenth filtering cavity F10 of the sixth filtering branch 17. The cavity arrangement structure is regular and adjacent, so that the cavity arrangement of the sixth filtering branch 17 is more compact, and the arrangement space of the sixth filtering branch 17 can be reduced.

The capacitive cross coupling is respectively performed between the third filter cavity F3 of the sixth filter branch 17 and the fifth filter cavity F5 of the fifth filter branch 16, between the sixth filter cavity F6 of the sixth filter branch 17 and the eighth filter cavity F8 of the fifth filter branch 16, and between the eighth filter cavity F8 of the sixth filter branch 17 and the tenth filter cavity F10 of the fifth filter branch 16, so as to form three capacitive coupling zeros of the sixth filter branch 17.

The coupling zero points of the sixth filtering branch 17 are capacitive coupling zero points, so that the consistency of materials can be improved, the types of the materials are reduced, the processing is convenient, and the installation efficiency can be improved.

As shown in fig. 7, a flying bar (equivalent to the capacitor C4 shown in fig. 7) may be provided between the third filter chamber F3 and the fifth filter chamber F5, a flying bar (equivalent to the capacitor C5 shown in fig. 7) may be provided between the sixth filter chamber F6 and the eighth filter chamber F8, and a flying bar (equivalent to the capacitor C6 shown in fig. 7) may be provided between the eighth filter chamber F8 and the tenth filter chamber F10.

Optionally, as shown in fig. 1, the filter 10 further includes a seventh filtering branch 18, and the structure of the seventh filtering branch 18 is the same as that of the sixth filtering branch 17. In particular, arranged on the housing 11, the seventh filtering branch 18 is composed of eleven filtering cavities G1-G11 coupled in sequence along a seventh coupling path and forms three coupling zeros of the seventh filtering branch 18. The coupling zero of the seventh filtering branch 18 can improve the out-of-band rejection and other characteristics of the signal of the seventh filtering branch 18.

Wherein, the first filtering cavity G1, the second filtering cavity G2, the third filtering cavity G3 and the fourth filtering cavity G4 of the seventh filtering branch 18 are adjacent in pairs and arranged in a diamond shape, the third filtering cavity G3, the fourth filtering cavity G4, the fifth filtering cavity G5 and the sixth filtering cavity G6 of the seventh filtering branch 18 are adjacent in pairs and arranged in a diamond shape, the fifth filtering cavity G5, the sixth filtering cavity G6, the seventh filtering cavity G7 and the eighth filtering cavity G8 of the seventh filtering branch 18 are adjacent in pairs and arranged in a diamond shape, the seventh filtering cavity G7, the eighth filtering cavity G8, the ninth filtering cavity G9 and the tenth filtering cavity G10 of the seventh filtering branch 18 are adjacent in pairs and arranged in a diamond shape, wherein the first filtering cavity G1, the sixth filtering cavity G84 and the ninth filtering cavity G10 of the seventh filtering branch 18 overlap in the direction of the projection of the ninth filtering cavity G4642 and the ninth filtering cavity G8 of the seventh filtering branch 18, the projections of the second filter cavity G2, the fifth filter cavity G5 and the tenth filter cavity G10 of the seventh filter branch 18 in the second direction y overlap; the eleventh filtering cavity G11 of the seventh filtering branch 18 is disposed adjacent to the ninth filtering cavity G9 and the tenth filtering cavity G10 of the seventh filtering branch 18, and the eleventh filtering cavity G11 of the seventh filtering branch 18 is close to the center-split line of the housing 11 in the second direction y 1 with respect to the tenth filtering cavity G10 of the seventh filtering branch 18. The cavity arrangement structures are regular and are arranged adjacently, so that the cavity arrangement of the seventh filtering branch circuit 18 is more compact, and the arrangement space of the seventh filtering branch circuit 18 can be reduced.

The capacitive cross coupling is respectively performed between the third filtering cavity G3 of the seventh filtering branch 18 and the fifth filtering cavity G5 of the seventh filtering branch 18, between the sixth filtering cavity G6 of the seventh filtering branch 18 and the eighth filtering cavity G8 of the seventh filtering branch 18, and 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 three capacitive coupling zeros of the seventh filtering branch 18.

The coupling zero points of the seventh filtering branch circuit 18 are capacitive coupling zero points, so that the consistency of materials can be improved, the types of the materials are reduced, the processing is convenient, and the installation efficiency can be improved.

As shown in fig. 8, a flying bar (equivalent to the capacitor C7 shown in fig. 8) may be provided between the third filter chamber G3 and the fifth filter chamber G5, a flying bar (equivalent to the capacitor C8 shown in fig. 8) may be provided between the sixth filter chamber G6 and the eighth filter chamber G8, and a flying bar (equivalent to the capacitor C9 shown in fig. 8) may be provided between the eighth filter chamber G8 and the tenth filter chamber G10.

Optionally, as shown in fig. 1, the filter 10 further includes an eighth filtering branch 19 disposed on the housing 11, where the eighth filtering branch 19 is composed of eleven filtering cavities G1-G11 coupled in sequence along an eighth coupling path, and forms three coupling zeros of the eighth filtering branch 19. The coupling zero of the eighth filtering branch 19 can improve the out-of-band rejection and other characteristics of the signal of the eighth filtering branch 19.

The second filtering cavity H2, the third filtering cavity H3, the fourth filtering cavity H4 and the fifth filtering cavity H5 of the eighth filtering branch 19 are adjacent in pairs and arranged in a diamond shape, the fourth filtering cavity H4, the fifth filtering cavity H5, the sixth filtering cavity H6 and the seventh filtering cavity H7 of the eighth filtering branch 19 are adjacent in pairs and arranged in a diamond shape, the sixth filtering cavity H6, the seventh filtering cavity H7, the ninth filtering cavity H9 and the tenth filtering cavity H10 of the eighth filtering branch 19 are arranged in a direction, the eighth filtering cavity H8 of the eighth filtering branch 19 is located in the center of the square shape and is respectively arranged adjacent to the sixth filtering cavity H6, the seventh filtering cavity H7, the ninth filtering cavity H8 and the tenth filtering cavity H10 of the eighth filtering branch 19; the projections of the second filter cavity H2, the seventh filter cavity H7 and the ninth filter cavity H9 of the eighth filter branch 19 in the first direction x are overlapped, the projections of the fifth filter cavity H5 and the eighth filter cavity H8 of the eighth filter branch 19 in the first direction x are overlapped, and the projections of the third filter cavity H3, the sixth filter cavity H6 and the tenth filter cavity H10 of the eighth filter branch 19 in the first direction x are overlapped; the first filter cavity H1 of the eighth filter branch 19 is closer to the midline of the housing 11 in the first direction x 1 with respect to the second filter cavity H2 of the eighth filter branch 19; the tenth filter cavity H10 of the eighth filter branch 19 is closer to the center of the housing 11 in the first direction x than the eleventh filter cavity H11 of the eighth filter branch 19. The cavity arrangement structure is regular and adjacent, so that the cavity arrangement of the eighth filtering branch circuit 19 is more compact, and the arrangement space of the eighth filtering branch circuit 19 can be reduced.

The capacitive cross coupling is respectively performed between the third filtering cavity H3 of the eighth filtering branch 19 and the fifth filtering cavity H5 of the eighth filtering branch 19, between the sixth filtering cavity H6 of the eighth filtering branch 19 and the eighth filtering cavity H8 of the eighth filtering branch 19, and between the eighth filtering cavity H8 of the eighth filtering branch 19 and the tenth filtering cavity H10 of the eighth filtering branch 19, so as to form three capacitive coupling zeros of the eighth filtering branch 19.

Coupling zero points of the eighth filtering branch circuit 19 are capacitive coupling zero points, so that the consistency of materials can be improved, the types of the materials are reduced, the processing is convenient, and the installation efficiency can be improved.

As shown in fig. 9, a flying bar (equivalent to the capacitor C10 shown in fig. 9) may be provided between the third filter chamber H3 and the fifth filter chamber H5, a flying bar (equivalent to the capacitor C11 shown in fig. 9) may be provided between the sixth filter chamber H6 and the eighth filter chamber H8, and a flying bar (equivalent to the capacitor C12 shown in fig. 9) may be provided between the eighth filter chamber H8 and the tenth filter chamber H10.

Optionally, as shown in fig. 1, the housing 11 is further provided with: a first common cavity AF, a second common cavity BG, a third common cavity CE and a fourth common cavity DH, wherein the first common cavity AF is respectively connected to the first filtering cavity a1 of the first filtering branch 12 and the first filtering cavity F1 of the sixth filtering branch 17; the second common cavity BG is respectively connected with the first filtering cavity B1 of the second filtering branch 14 and the first filtering cavity G1 of the seventh filtering branch 18; the third common cavity CE is connected to the first filter cavity C1 of the third filter branch 14 and the first filter cavity E1 of the fifth filter branch 16, respectively; the fourth common cavity DH is connected to the first filter cavity D1 of the fourth filter branch 15 and the first filter cavity H1 of the eighth filter branch 19, respectively.

The volume of the filter 10 can be reduced by arranging the common cavity in every two filtering branches, and every two filtering branches can be connected with the common port through the common cavity without respectively arranging ports for the two filtering branches, so that the number of taps and tap welding points can be reduced, the cost of the filter 10 can be reduced, and the configuration flexibility of the filter is improved.

Optionally, as shown in fig. 1, the first filtering branch 12, the second filtering branch 13, the third filtering branch 14, and the fourth filtering branch 15 are sequentially arranged along a first direction x, and the fifth filtering branch 16, the sixth filtering branch 17, the seventh filtering branch 18, and the eighth filtering branch 19 are sequentially arranged along the first direction x; and the first filtering branch 12 and the sixth filtering branch 17, the second filtering branch 13 and the seventh filtering branch 18, the third filtering branch 14 and the fifth filtering branch 16, and the fourth filtering branch 15 and the eighth filtering branch 19 are respectively arranged along the second direction y, so that the filtering branches of the filter 10 are uniformly arranged, and the size of the filter 10 can be reduced.

The first filtering branch 12 and the third filtering branch 14 are arranged adjacently, the second filtering branch 13 and the fourth filtering branch 14 are arranged adjacently, the fifth filtering branch 16 and the sixth filtering branch 17 are arranged adjacently, and the seventh filtering branch 18 and the eighth filtering branch 19 are arranged adjacently, so that the arrangement space of the filtering branches can be further reduced; the first filtering branch 12 and the second filtering branch 13 are disposed at an interval, and the sixth filtering branch 17 and the seventh filtering branch 18 are disposed at an interval, so as to reserve a space and facilitate the wiring of the common cavity.

Further, as shown in fig. 1, the housing 11 is further provided with: a first input port (not shown) connected to the first common chamber AF; a second input port (not shown) connected to the second common chamber BG; a third input port (not shown) connected to the third common cavity CE; a fourth input port (not shown) connected to the fourth common chamber DH; a first output port (not shown) connected to the ninth filter cavity a9 of the first filter branch 12; a second output port (not shown) connected to the ninth filter cavity B9 of the second filter branch 13; a third output port (not shown) connected to the ninth filter cavity C9 of the third filter branch 14; a fourth output port (not shown) connected to the ninth filter cavity D9 of the fourth filter branch 15; a fifth output port (not shown) connected to the eleventh filter cavity E11 of the fifth filter branch 16; a sixth output port (not shown) connected to the eleventh filter cavity F11 of the sixth filter branch 17; a seventh output port (not shown) connected to the eleventh filter cavity G11 of the seventh filter branch 18; an eighth output port (not shown) connected to the eleventh filter cavity H11 of the eighth filter branch 19; the port is used for filtering signal transmission; the ports may each be taps.

As shown in fig. 1, in the first filter branch 12, the coupling bandwidth between the first common cavity AF of the first input port of the present embodiment ranges from 251MHz to 255 MHz; the coupling bandwidth between the first common cavity AF and the first filter cavity a1 ranges from 122MHz to 126 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 is in the range of 51MHz-55 MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 41MHz to 45 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 27MHz to 31 MHz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity A6 ranges from 5MHz to 9 MHz; the coupling bandwidth between the third filter cavity A3 and the seventh filter cavity A7 is in the range of 2MHz6 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 ranges from 20MHz to 24 MHz; the coupling bandwidth between the fourth filter cavity A4 and the sixth filter cavity A6 ranges from 24MHz to 28 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 7MHz to 11 MHz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 ranges from 39MHz to 43 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 42MHz to 46 MHz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 62MHz to 66 MHz; the coupling bandwidth between the ninth filter cavity a9 and the first output port is in the range of 78MHz-82MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity a1 to the ninth filtering cavity a9 of the first filter branch 12 are sequentially in the following ranges: 2592MHz-2594MHz, 2539MHz-2541MHz, 2535MHz-2537MHz, 2533MHz-2535MHz, 2559MHz-2561MHz, 2569MHz-2571MHz, 2537MHz-2539MHz, 2533MHz-2535MHz and 2533MHz-2535 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.

The filtering parameters of the second filtering branch 13 are the same as those of the first filtering branch 12, and are not described in detail.

As shown in fig. 1, in the third filtering branch 14, the coupling bandwidth between the third input port and the third common cavity CE in this embodiment ranges from 251MHz to 255 MHz; the coupling bandwidth between the third common cavity CE and the first filter cavity C1 ranges from 122MHz to 126 MHz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 ranges from 51MHz to 55 MHz; the coupling bandwidth between the second filter cavity C2 and the third filter cavity C3 ranges from 29MHz to 33 MHz; the coupling bandwidth between the second filter cavity C2 and the fifth filter cavity C5 ranges from 28MHz to 32 MHz; the coupling bandwidth between the second filter cavity C2 and the sixth filter cavity C6 ranges from 6MHz to 10 MHz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 ranges from 2MHz to 6 MHz; the coupling bandwidth between the third filter cavity C3 and the fifth filter cavity C5 ranges from 19MHz to 23 MHz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 ranges from 7MHz to 11 MHz; the coupling bandwidth between the fifth filter cavity C5 and the sixth filter cavity C6 ranges from 38MHz to 42 MHz; the coupling bandwidth between the sixth filter cavity C6 and the seventh filter cavity C7 ranges from 39MHz to 43 MHz; the coupling bandwidth between the seventh filtering cavity C7 and the eighth filtering cavity C8 ranges from 42MHz to 46 MHz; the coupling bandwidth between the eighth filter cavity C8 and the ninth filter cavity C9 ranges from 62MHz to 66 MHz; the coupling bandwidth between the ninth filtering cavity C9 and the third output port is in the range of 78MHz-82MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity C1 to the ninth filtering cavity C9 of the third filtering branch 14 are sequentially in the following ranges: 2592MHz-2594MHz, 2539MHz-2541MHz, 2535MHz-2537MHz, 2559MHz-2561MHz, 2569MHz-2571MHz, 2537MHz-2539MHz, 2533MHz-2535MHz, 2534MHz-2536MHz, 2533MHz-2535MHz and 2533MHz-2535 MHz.

The filtering parameters of the fourth filtering branch 15 are the same as those of the third filtering branch 14, and are not described in detail.

As shown in fig. 1, in the fifth filtering branch 16, the coupling bandwidth between the third input port and the first filtering cavity E1 in this embodiment is in the range of 79MHz-83 MHz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 ranges from 61MHz to 65 MHz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 ranges from 27MHz to 31 MHz; the coupling bandwidth between the second filter cavity E2 and the fourth filter cavity E4 is in the range of (-35) MHz- (-31) MHz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 ranges from 22MHz to 26 MHz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 ranges from 36MHz to 40 MHz; the coupling bandwidth between the fourth filter cavity E4 and the sixth filter cavity E6 is in the range of (-10) MHz- (-6) MHz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 ranges from 35MHz to 39 MHz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 ranges from 36MHz to 40 MHz; the coupling bandwidth between the seventh filter cavity E7 and the eighth filter cavity E8 ranges from 27MHz to 31 MHz; the coupling bandwidth between the seventh filter cavity E7 and the ninth filter cavity E9 is in the range of (-28) MHz- (-24) MHz; the coupling bandwidth between the eighth filter cavity E8 and the ninth filter cavity E9 ranges from 29MHz to 33 MHz; the coupling bandwidth between the ninth filter cavity E9 and the tenth filter cavity E10 ranges from 42MHz to 46 MHz; the coupling bandwidth between the tenth filter cavity E10 and the eleventh filter cavity E11 ranges from 61MHz to 65 MHz; the coupling bandwidth between the eleventh filter cavity E11 and the fifth output port is in the range of 79MHz-83MHz, and the design requirements can be met.

The resonant frequencies of the first filter cavity E1 to the eleventh filter cavity E11 of the fifth filter branch 16 are sequentially in the following ranges: 2654MHz-2656MHz, 2625MHz-2627MHz, 2656MHz-2658MHz, 2647MHz-2649MHz, 2655MHz-2657MHz, 2630MHz-2632MHz, 2654MHz-2656MHz and 2654MHz-2656 MHz.

As shown in fig. 1, in the sixth filtering branch 17, the coupling bandwidth between the first input port and the first filtering cavity F1 in this embodiment is in the range of 79MHz-83 MHz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 ranges from 61MHz to 65 MHz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 ranges from 42MHz to 46 MHz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 ranges from 26MHz to 30 MHz; the coupling bandwidth between the third filter cavity F3 and the fifth filter cavity F5 is in the range of (-31) MHz- (-27) MHz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 ranges from 24MHz to 28 MHz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 ranges from 36MHz to 40 MHz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 ranges from 35MHz to 39 MHz; the coupling bandwidth between the sixth filter cavity F6 and the eighth filter cavity F8 is in the range of (-10) MHz- (-6) MHz; the coupling bandwidth between the seventh filter cavity F7 and the eighth filter cavity F8 ranges from 36MHz to 40 MHz; the coupling bandwidth between the eighth filter cavity F8 and the ninth filter cavity F9 ranges from 26MHz to 30 MHz; the coupling bandwidth between the eighth filter cavity F8 and the tenth filter cavity F10 ranges from (-31) MHz- (-27) MHz; the coupling bandwidth between the ninth filter cavity F9 and the tenth filter cavity F10 ranges from 31MHz to 35 MHz; the coupling bandwidth between the tenth filter cavity F10 and the eleventh filter cavity F11 ranges from 61MHz to 65 MHz; the coupling bandwidth between the eleventh filter cavity F11 and the sixth output port is in the range of 79MHz-83MHz, and the design requirements can be met.

The resonant frequencies of the first filter cavity F1 to the eleventh filter cavity F11 of the sixth filter branch 17 are sequentially in the following ranges: 2654MHz-2656MHz, 2626MHz-2628MHz, 2655MHz-2657MHz, 2647MHz-2649MHz, 2655MHz-2657MHz, 2628MHz-2630MHz, 2654MHz-2656MHz and 2654MHz-2656 MHz.

The filtering parameters of the seventh filtering branch 18 and the eighth filtering branch 19 are the same as those of the sixth filtering branch 17, and are not described in detail.

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

As shown in fig. 10, the bandwidth of the receiving and filtering branch is in a range of 2498MHz-2572MHz, and as shown by a frequency band curve S1 in fig. 10, the coupling zeros of the receiving and filtering branch include a, b, and c, and the coupling zeros enable the bandwidth rejection at the frequency point of 2575MHz to be greater than 41dB, and the bandwidth rejection at the frequency point of 2620MHz to be greater than 80dB, so that the performance such as out-of-band rejection of the receiving and filtering branch can be satisfied; the bandwidth of the transmitting filter branch is within the range of 2617.5MHz-2692MHz, as shown in a frequency band curve S2 in fig. 10, coupling zeros of the receiving filter branch include d, e, and f, and the coupling zeros enable the bandwidth rejection of the frequency point 2570MHz to be greater than 110dB, the bandwidth rejection of the frequency point 2615MHz to be greater than 52dB, so that the performances of the receiving filter branch such as out-of-band rejection can be satisfied;

it should be noted that the parameters (e.g., frequency point and suppression) of two or more coupling zeros of the present application may be the same; in the simulation diagram, the coupling zeros of the same parameters are shown as the same coupling zeros.

In another embodiment, as shown in fig. 11 to 16, fig. 11 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 12 is a schematic diagram of a topology of a fifth filtering branch in an embodiment of the filter of the present application; FIG. 13 is a schematic diagram of a topology of a sixth filtering branch in an embodiment of the filter of the present application; FIG. 14 is a schematic diagram of a topology of a seventh filtering branch in an embodiment of the filter of the present application; FIG. 15 is a schematic diagram of a topology of an eighth filtering branch in an embodiment of the filter of the present application; FIG. 16 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The filter 10 of the present embodiment differs from the above-described filter 10 in that: as shown in fig. 11, in the present embodiment, the second filter cavity E2, the third filter cavity E3, the fifth filter cavity E5, and the sixth filter cavity E6 of the fifth filter branch 16 are arranged in a square shape, the fourth filter cavity E4 of the fifth filter branch 16 is located at the center of the square shape, the fourth filter cavity E4 of the fifth filter branch 16 is respectively adjacent to the second filter cavity E2, the third filter cavity E3, the fifth filter cavity E5, and the sixth filter cavity E6 of the fifth filter branch 16, and the second filter cavity E2 of the fifth filter branch 16 is adjacent to the third filter cavity E3 of the fifth filter branch 16; the fifth filtering cavity E5, the sixth filtering cavity E6, the seventh filtering cavity E7 and the ninth filtering cavity E9 of the fifth filtering branch 16 are adjacent in pairs and arranged in a diamond shape; the seventh filtering cavity E7, the eighth filtering cavity E8, the ninth filtering cavity E9 and the tenth filtering cavity E10 of the fifth filtering branch 16 are adjacent in pairs and arranged in a diamond shape; the eleventh filter cavity E11 of the fifth filter branch 16 is respectively disposed adjacent to the eighth filter cavity E8 of the fifth filter branch 16 and the tenth filter cavity E10 of the fifth filter branch 16, and projections of the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 16 in the second direction y overlap; the first filter chamber E1 of the fifth filter branch 16 is closer to the midline of the housing 11 in the first direction x than the third filter chamber E3 of the fifth filter branch 16. The cavity arrangement structure is relatively regular, so that the cavity arrangement of the fifth filtering branch 16 is more compact, and the arrangement space of the fifth filtering branch 16 can be reduced.

The ninth filtering cavity E9 and the tenth filtering cavity E10, and the tenth filtering cavity E10 and the eleventh filtering cavity E11 of the fifth filtering branch 16 are respectively arranged in an intersecting manner, and by the intersecting arrangement of the filtering cavities, a partition wall is not required to be arranged between the two coupled filtering cavities in the conventional filter, and then a coupling window is formed on the partition wall, so that materials can be reduced, and the processing process can be simplified.

Capacitive cross coupling is respectively performed between the second filter cavity E2 of the fifth filter branch 16 and the fourth filter cavity E4 of the fifth filter branch 16, and between the seventh filter cavity E7 of the fifth filter branch 16 and the ninth filter cavity E9 of the fifth filter branch 16, so as to form two capacitive coupling zeros of the fifth filter branch 16; inductive cross-coupling is respectively performed 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 sixth filter cavity E6 of the fifth filter branch 16 and the ninth filter cavity E9 of the fifth filter branch 16, so as to form two inductive coupling zeros of the fifth filter branch 16.

As shown in fig. 12, a flying bar (equivalent to the capacitor C13 shown in fig. 12) may be disposed between the second filter cavity E2 and the fourth filter cavity E4, a flying bar (equivalent to the capacitor C14 shown in fig. 12) may be disposed between the seventh filter cavity E7 and the ninth filter cavity E9, a window and a metal coupling rib (equivalent to the capacitor L13 shown in fig. 12) may be disposed between the fourth filter cavity E4 and the sixth filter cavity E6, and a window and a metal coupling rib (equivalent to the capacitor L14 shown in fig. 12) may be disposed between the sixth filter cavity E6 and the ninth filter cavity E9.

As shown in fig. 10 and 13, the sixth filter branch 17 of the present embodiment is different from the sixth filter branch 17 of the above-mentioned embodiment in the distribution of coupling zeros, in the present embodiment, inductive cross coupling is respectively performed between the third filter cavity F3 of the sixth filter branch 17 and the sixth filter cavity F6 of the sixth filter branch 17, between the sixth filter cavity F6 of the sixth filter branch 17 and the eighth filter cavity F8 of the sixth filter branch 17 to form two inductive coupling zeros of the sixth filter branch 17, capacitive cross coupling is respectively performed between the third filter cavity F3 of the sixth filter branch 17 and the fifth filter cavity F5 of the sixth filter branch 17, between the eighth filter cavity F8 of the sixth filter branch 17 and the tenth filter cavity F10 of the sixth filter branch 17 to form two capacitive coupling zeros of the sixth filter branch 17, a flying bar (equivalent to the capacitance C15 shown in fig. 13) may be disposed between the third filter cavity F3 and the fifth filter cavity F5, and the equivalent capacitance F6329 of the sixth filter branch 17 may be disposed between the eighth filter cavity F3513 and the equivalent capacitance F10 (equivalent to the equivalent capacitance F6313) and the equivalent capacitance F6313 shown in fig. 13), and equivalent to the equivalent capacitance F3513 (equivalent capacitance F3613) may be disposed between the equivalent filtering window 3613 and the equivalent filtering window 3513) shown in fig. 13).

As shown in fig. 10 and 14, the seventh filtering branch 18 of the present embodiment is different from the seventh filtering branch 18 of the above-mentioned embodiments in the distribution of coupling zeros, in the present embodiment, two inductive coupling zeros are formed between the third filtering cavity G3 of the seventh filtering branch 18 and the sixth filtering cavity G6 of the seventh filtering branch 18, between the sixth filtering cavity G6 of the seventh filtering branch 18 and the eighth filtering cavity G8 of the seventh filtering branch 18 by inductive cross-coupling, two capacitive coupling zeros of the seventh filtering branch 18 are formed between the third filtering cavity G3 of the seventh filtering branch 18 and the fifth filtering cavity G5 of the seventh filtering branch 18, between the eighth filtering cavity G8 of the seventh filtering branch 18 and the tenth filtering cavity G10 of the seventh filtering branch 18 by capacitive cross-coupling, two capacitive coupling zeros of the seventh filtering branch 18 are formed, a flying bar (equivalent to the capacitance C3 of the seventh filtering cavity G5 of the seventh filtering branch 14) may be disposed between the third filtering cavity G6348 and the fifth filtering cavity G5 (equivalent to the equivalent capacitance C6329 of the eighth filtering cavity G3514), and the equivalent flying bar may be disposed between the sixth filtering cavity G6314 and the equivalent to the equivalent filtering cavity G6314 (equivalent to the equivalent capacitance window 12 of the eighth filtering cavity G10 of the eighth filtering cavity G6314) of the eighth filtering branch 18 (equivalent filtering cavity G6314).

As shown in fig. 10 and 15, the eighth filter branch 19 of the present embodiment has a different distribution of coupling zeros from the eighth filter branch 19 of the previous embodiments, in the present embodiment, the third filter cavity H3 of the eighth filter branch 19 is inductively cross-coupled with the sixth filter cavity H6 of the eighth filter branch 19, the sixth filter cavity H6 of the eighth filter branch 19 is inductively cross-coupled with the eighth filter cavity H8 of the eighth filter branch 19 to form two inductive coupling zeros of the eighth filter branch 19, the third filter cavity H3 of the eighth filter branch 19 is capacitively cross-coupled with the fifth filter cavity H5 of the eighth filter branch 19, the eighth filter cavity H8 of the eighth filter branch 19 is capacitively cross-coupled with the tenth filter cavity H10 of the eighth filter branch 19 to form two capacitive coupling zeros of the eighth filter branch 19, an equivalent coupling rod (equivalent coupling rod is set between the third filter cavity H3 and the fifth filter cavity H5, equivalent coupling rod is set between the eighth filter cavity H6329 and the tenth filter cavity H10, and equivalent coupling rod equivalent coupling rod coupling window is set between the eighth filter cavity H6319 and equivalent filtering rod coupling window (equivalent rod coupling window) of the eighth filter cavity H3615 and equivalent filtering cavity H6319, equivalent filtering rod equivalent filtering cavity H3529 of the eighth filter cavity H366 of the eighth filter branch 19 (equivalent filtering rod equivalent filtering cavity.

As shown in fig. 11, 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 85MHz-89 MHz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 68MHz to 72 MHz; the coupling bandwidth between the second filter cavity A2 and the third filter cavity A3 is in the range of 78MHz to 52 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 ranges from 40MHz to 42 MHz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity A6 ranges from 17MHz to 21 MHz; the coupling bandwidth between the third filter cavity A3 and the seventh filter cavity A7 ranges from 1MHz to 5 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 ranges from 12MHz to 16 MHz; the coupling bandwidth between the fourth filter cavity A4 and the sixth filter cavity A6 ranges from 30MHz to 34 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 20MHz to 24 MHz; the coupling bandwidth between the sixth filter cavity A6 and the seventh filter cavity A7 ranges from 44MHz to 48 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 48MHz to 52 MHz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 68MHz to 72 MHz; the coupling bandwidth between the ninth filtering cavity a9 and the first output port is in the range of 85MHz-89MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity a1 to the ninth filtering cavity a9 of the first filter branch 12 are sequentially in the following ranges: 1746MHz-1748MHz, 1762MHz-1764MHz, 1784MHz-1786MHz, 1747MHz-1749MHz, 1746MHz-1748MHz and 1746MHz-1748 MHz.

The filtering parameters of the second filtering branch 13 in this embodiment are the same as those of the first filtering branch 12 in this embodiment, and are not described again.

As shown in fig. 11, in the third filtering branch 14, the coupling bandwidth between the third input port and the first filtering cavity C1 is in the range of 85MHz-89 MHz; the coupling bandwidth between the first filter cavity C1 and the second filter cavity C2 ranges from 68MHz to 72 MHz; the coupling bandwidth between the second filter chamber C2 and the third filter chamber C3 ranges from 43MHz to 47 MHz; the coupling bandwidth between the second filter cavity C2 and the fifth filter cavity C5 ranges from 19MHz to 23 MHz; the coupling bandwidth between the second filter cavity C2 and the sixth filter cavity C6 ranges from 1MHz to 5 MHz; the coupling bandwidth between the third filter cavity C3 and the fourth filter cavity C4 ranges from 12MHz to 16 MHz; the coupling bandwidth between the third filter chamber C3 and the fifth filter chamber C5 ranges from 30MHz to 34 MHz; the coupling bandwidth between the fourth filter cavity C4 and the fifth filter cavity C5 ranges from 19MHz to 21 MHz; the coupling bandwidth between the fifth filter cavity C5 and the sixth filter cavity C6 ranges from 43MHz to 47 MHz; the coupling bandwidth between the sixth filtering cavity C6 and the seventh filtering cavity C7 ranges from 44MHz to 48 MHz; the coupling bandwidth between the seventh filtering cavity C7 and the eighth filtering cavity C8 ranges from 48MHz to 52 MHz; the coupling bandwidth between the eighth filter cavity C8 and the ninth filter cavity C9 ranges from 68MHz to 72 MHz; the coupling bandwidth range between the ninth filtering cavity C9 and the third output port is 85MHz-89MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity C1 to the ninth filtering cavity C9 of the third filter branch 14 are sequentially in the following ranges: 1746MHz-1748MHz, 1762MHz-1764MHz, 1784MHz-1786MHz, 1746MHz-1748MHz, and 1746MHz-1748 MHz.

The filtering parameters of the fourth filtering branch 15 in this embodiment are the same as those of the third filtering branch 14 in this embodiment, and are not described in detail.

As shown in fig. 11, in the fifth filtering branch 16, the coupling bandwidth between the third input port and the first filtering cavity E1 in this embodiment is in the range of 81MHz-85 MHz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 ranges from 65MHz to 69 MHz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 ranges from 41MHz to 45 MHz; the coupling bandwidth between the second filter cavity E2 and the fourth filter cavity E4 is in the range of (-21) MHz- (-17) MHz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 ranges from 37MHz to 41 MHz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 ranges from 18MHz to 22 MHz; the coupling bandwidth between the fourth filter cavity E4 and the sixth filter cavity E6 ranges from 10MHz to 14 MHz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 ranges from 38MHz to 42 MHz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 ranges from 39MHz to 43 MHz; the coupling bandwidth between the sixth filter cavity E6 and the ninth filter cavity E9 is in the range of 4 MHz-8; the coupling bandwidth between the seventh filter cavity E7 and the eighth filter cavity E8 ranges from 24MHz to 28 MHz; the coupling bandwidth between the seventh filter cavity E7 and the ninth filter cavity E9 is in the range of (-31) MHz- (-29) MHz; the coupling bandwidth between the eighth filter cavity E8 and the ninth filter cavity E9 ranges from 30MHz to 34 MHz; the coupling bandwidth between the ninth filter cavity E9 and the tenth filter cavity E10 ranges from 45MHz to 49 MHz; the coupling bandwidth between the tenth filter cavity E10 and the eleventh filter cavity E11 ranges from 65MHz to 69 MHz; the coupling bandwidth range between the eleventh filter cavity E11 and the fifth output port is 81MHz-85MHz, and the design requirement can be met.

The resonant frequencies of the first filter cavity E1 to the eleventh filter cavity E11 of the fifth filter branch 16 are sequentially in the following ranges: 1840MHz-1842MHz, 1822MHz-1824MHz, 1841MHz-1843MHz, 1853MHz-1855MHz, 1840MHz-1842MHz, 1836MHz-1838MHz, 1812MHz-1814MHz, 1840MHz-1842 MHz.

As shown in fig. 11, in the sixth filtering branch 17, the coupling bandwidth between the first input port of the present embodiment and the first filtering cavity F1 is in the range of 81MHz-85 MHz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 ranges from 65MHz to 69 MHz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 ranges from 45MHz to 49 MHz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 ranges from 30MHz to 34 MHz; the coupling bandwidth between the third filter cavity F3 and the fifth filter cavity F5 is in the range of (-31) MHz- (-27) MHz; the coupling bandwidth between the third filter cavity F3 and the fifth filter cavity F5 ranges from 4MHz to 8 MHz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 ranges from 24MHz to 28 MHz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 ranges from 40MHz to 45 MHz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 ranges from 38MHz to 42 MHz; the coupling bandwidth between the sixth filter cavity F6 and the eighth filter cavity F8 ranges from 10MHz to 14 MHz; the coupling bandwidth between the seventh filter cavity F7 and the eighth filter cavity F8 ranges from 38MHz to 42 MHz; the coupling bandwidth between the eighth filter cavity F8 and the ninth filter cavity F9 ranges from 37MHz to 41 MHz; the coupling bandwidth between the eighth filter cavity F8 and the tenth filter cavity F10 ranges from (-21) MHz- (-17) MHz; the coupling bandwidth between the ninth filter cavity F9 and the tenth filter cavity F10 ranges from 41MHz to 45 MHz; the coupling bandwidth between the tenth filter cavity F10 and the eleventh filter cavity F11 ranges from 65MHz to 69 MHz; the coupling bandwidth range between the eleventh filter cavity F11 and the sixth output port is 81MHz-85MHz, and the design requirement can be met.

The resonant frequencies of the first filter cavity F1 to the eleventh filter cavity F11 of the sixth filter branch 17 are sequentially in the following ranges: 1840MHz-1842MHz, 1812MHz-1814MHz, 1836MHz-1838MHz, 1840MHz-1842MHz, 1853MHz-1855MHz, 1841MHz-1843MHz, 1822MHz-1824MHz, 1840MHz-1842 MHz.

The filtering parameters of the seventh filtering branch 18 and the eighth filtering branch 19 in this embodiment are the same as the sixth filtering branch 17 in this embodiment, and are not described in detail.

As shown in fig. 16, the bandwidth of the receiving and filtering branch is within a range from 1706MHz to 1790MHz, and as shown in a frequency band curve S1 in fig. 16, coupling zeros of the receiving and filtering branch include a, b, and c, where the coupling zeros enable the bandwidth rejection at the frequency point of 1805MHz to be greater than 75dB, and the bandwidth rejection at the frequency point of 1825MHz to be greater than 80dB, so that the performance of the receiving and filtering branch, such as out-of-band rejection, can be satisfied; the bandwidth of the transmitting filtering branch is located in a range from 1800MHz to 1882MHz, as shown in a frequency band curve S2 in fig. 16, coupling zeros of the receiving filtering branch include d, e, and f, and the coupling zeros enable the bandwidth rejection of the frequency point 1775MHz to be greater than 113dB, the bandwidth rejection of the frequency point 1785MHz to be greater than 105dB, and the performances of the receiving filtering branch such as out-of-band rejection can be satisfied.

In another embodiment, as shown in fig. 17 to 22, fig. 17 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 18 is a schematic diagram of a topology of a first filtering branch in an embodiment of a filter according to the present application; FIG. 19 is a schematic diagram of a topology of a second filtering branch in an embodiment of a filter according to the present application; FIG. 20 is a schematic diagram of a topology of a third filtering branch in an embodiment of a filter according to the present application; FIG. 21 is a schematic diagram of a topology of a fourth filtering branch in an embodiment of a filter according to the present application; FIG. 22 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The filter 10 of the present embodiment differs from the filter 10 of the above-described embodiment of fig. 11 to 16 in that: the first filtering branch 12 to the fourth filtering branch 15 of the present embodiment have different coupling zero distributions.

Specifically, as shown in fig. 17 and fig. 18, in the present embodiment, the third filter cavity A3 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12, and the fourth filter cavity a4 of the first filter branch 12 and the sixth filter cavity a6 of the first filter branch 12 are inductively cross-coupled to form two inductive coupling zeros of the first filter branch 12, respectively, a window and a metal coupling rib (equivalent to the capacitor L21 shown in fig. 18) may be disposed between the third filter cavity A3 and the sixth filter cavity a6, and a window and a metal coupling rib (equivalent to the capacitor L22 shown in fig. 18) may be disposed between the fourth filter cavity a4 and the sixth filter cavity a 6.

As shown in fig. 17 and fig. 19, in this embodiment, the third filter cavity B3 of the second filter branch 13 and the sixth filter cavity B6 of the second filter branch 13, and the fourth filter cavity B4 of the second filter branch 13 and the sixth filter cavity B6 of the second filter branch 13 are inductively cross-coupled to form two inductive coupling zeros of the second filter branch 13, a window and a metal coupling rib (equivalent to the capacitor L23 shown in fig. 19) may be disposed between the third filter cavity B3 and the sixth filter cavity B6, and a window and a metal coupling rib (equivalent to the capacitor L24 shown in fig. 19) may be disposed between the fourth filter cavity B6 and the sixth filter cavity B6.

As shown in fig. 17 and fig. 20, in this embodiment, the third filter cavity C3 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14, and the fourth filter cavity C4 of the third filter branch 14 and the sixth filter cavity C6 of the third filter branch 14 are inductively cross-coupled to form two inductive coupling zeros of the third filter branch 14, a window and a metal coupling rib (equivalent to the capacitor L25 shown in fig. 20) may be disposed between the third filter cavity C3 and the sixth filter cavity C6, and a window and a metal coupling rib (equivalent to the capacitor L26 shown in fig. 20) may be disposed between the fourth filter cavity C4 and the sixth filter cavity C6.

As shown in fig. 17 and fig. 21, in this embodiment, the third filter cavity D3 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15, and the fourth filter cavity D4 of the fourth filter branch 15 and the sixth filter cavity D6 of the fourth filter branch 15 are inductively cross-coupled to form two inductive coupling zeros of the fourth filter branch 15, respectively, a window and a metal coupling rib (equivalent to the capacitor L27 shown in fig. 21) may be disposed between the third filter cavity D3 and the sixth filter cavity D6, and a window and a metal coupling rib (equivalent to the capacitor L28 shown in fig. 21) may be disposed between the fourth filter cavity D4 and the sixth filter cavity D6.

As shown in fig. 17, in the first filter branch 12, the coupling bandwidth between the first input port of the present embodiment and the first common cavity AF ranges from 348MHz to 352 MHz; the coupling bandwidth between the first common cavity AF and the first filter cavity a1 ranges from 144MHz to 148 MHz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 ranges from 55MHz to 59 MHz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 ranges from 46MHz to 50 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 ranges from 43MHz to 45 MHz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity A6 ranges from 5MHz to 9 MHz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 ranges from 25MHz to 29 MHz; the coupling bandwidth between the fourth filter cavity A4 and the sixth filter cavity A6 ranges from 29MHz to 33 MHz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 ranges from 30MHz to 34 MHz; the coupling bandwidth between the sixth filter cavity A6 and the seventh filter cavity A7 ranges from 44MHz to 48 MHz; the coupling bandwidth between the seventh filter cavity A7 and the eighth filter cavity A8 ranges from 48MHz to 52 MHz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 ranges from 68MHz to 72 MHz; the coupling bandwidth between the ninth filtering cavity A9 and the first output port is in the range of 89MHz-93 MHz; can meet the design requirements.

Wherein, the range of the AF resonant frequency of the first common cavity is as follows: 1791MHz to 1793 MHz; the resonant frequencies of the first filter cavity a1 to the ninth filter cavity a9 of the first filter branch 12 lie in the following ranges in order: 1742MHz-1744MHz, 1744MHz-1746MHz, 1745MHz-1747MHz, 1750MHz-1752MHz, 1776MHz-1778MHz, 1775MHz-1777MHz, 1776MHz-1778MHz, and 1776MHz-1778 MHz.

As shown in fig. 22, the bandwidth of the receiving filter branch is in the range of 1709MHz-1786MHz, and as shown in the frequency band curve S1 in fig. 22, the coupling zeros of the receiving filter branch include a, b, and c; the bandwidth of the transmitting filtering branch is in the range of 1804MHz-1881MHz, as shown by a frequency band curve S2 in fig. 22, the coupling zeros of the receiving filtering branch include d, e, f; the coupling zero point enables the bandwidth inhibition of 1626.5MHz-1660.5MHz to be greater than or equal to 111dB, the bandwidth inhibition of 1660.5MHz-1710MHz to be greater than or equal to 100dB, the bandwidth inhibition of 1710MHz-1775MHz to be greater than or equal to 113dB, the bandwidth inhibition of 1775MHz-1785MHz to be greater than or equal to 105dB, the bandwidth inhibition of 1785MHz-1795MHz to be greater than or equal to 24dB, the bandwidth inhibition of 1795MHz-1799.4MHz to be greater than or equal to 5dB, the bandwidth inhibition of 1799.4MHz-1800MHz to be greater than or equal to 1883 dB, the bandwidth inhibition of 350 MHz-1885.6MHz to be greater than or equal to 3dB, the bandwidth inhibition of 1885.6MHz-1890MHz to be greater than or equal to 5dB, the bandwidth inhibition of 1890MHz-1900MHz to be greater than or equal to 21dB, and the bandwidth inhibition of 1900MHz-1920MHz to be greater than or equal to 45dB, the bandwidth rejection of the frequency band of 1920MHz-1955MHz is larger than or equal to 88dB, the bandwidth rejection of the frequency band of 1955MHz-1980MHz is larger than or equal to 83dB, the bandwidth rejection of the frequency band of 1980MHz-2025MHz is larger than or equal to 111dB, the bandwidth rejection of the frequency band of 2025MHz-2400MHz is larger than or equal to 80dB, the bandwidth rejection of the frequency band of 2400MHz-3800MHz is larger than or equal to 61dB, the bandwidth rejection of the frequency band of 3800MHz-5640MHz is larger than or equal to 35dB, the bandwidth rejection of the frequency band of 7220MHz-7520MHz is larger than or equal to 26dB, the bandwidth rejection of the frequency band of 9025MHz-9400MHz is larger than or equal to 26dB, the bandwidth rejection of the frequency band of 10830MHz-11280MHz is larger than or equal to 15dB, and the performance of the out-of.

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. 23, fig. 23 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 first filtering branch and the second filtering branch of the filter of the embodiment of the application adopt symmetrical structures, so that the cavity arrangement of the filter is more regular, the production and debugging are convenient, the process can be simplified, and the cost is saved; and the coupling zero points of the first filtering branch and the second filtering branch are inductive coupling zero points, so that the consistency of materials can be improved, the types of the materials can be reduced, and the temperature drift of the first filtering branch and the second filtering branch can be reduced.

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

Claims

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

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

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

the second filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a second coupling path, and at least two inductive coupling zeros of the second filtering branch are formed;

the first filtering branches are symmetrically distributed along a midline of the shell in the first direction.

2. The filter according to claim 1, wherein the nine filter cavities of the first filter branch are divided into two columns arranged along the first direction;

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

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

the second filter cavity of the first filter branch is also respectively adjacent to the seventh filter cavity of the first filter branch and the eighth filter cavity of the first filter branch.

3. The filter of claim 2,

inductive cross coupling is respectively performed between a third filter cavity of the first filter branch and a sixth filter cavity of the first filter branch, between the third filter cavity of the first filter branch and a seventh filter cavity of the first filter branch, and between a fourth filter cavity of the first filter branch and the sixth filter cavity of the first filter branch, so that three inductive coupling zeros of the first filter branch are formed;

or the third filtering cavity of the first filtering branch and the sixth filtering cavity of the first filtering branch, and the fourth filtering cavity of the first filtering branch and the sixth filtering cavity of the first filtering branch are inductively cross-coupled, respectively, to form two inductive coupling zeros of the first filtering branch.

4. The filter of claim 2, further comprising:

the third filtering branch is arranged on the shell and consists of nine filtering cavities which are sequentially coupled along a third coupling path, and at least two capacitive coupling zeros of the third filtering branch are formed;

the nine filter cavities of the third filter branch are divided into two rows arranged along the first direction, the first filter cavity, the second filter cavity and the third filter cavity of the third filter branch are one row and are sequentially and adjacently arranged along the second direction, the fourth filter cavity, the fifth filter cavity, the sixth filter cavity, the seventh filter cavity, the eighth filter cavity and the ninth filter cavity of the third filter branch are one row and are sequentially and adjacently arranged along the second direction, and the third filter cavity of the third filter branch is also respectively and adjacently arranged with the fourth filter cavity of the third filter branch and the fifth filter cavity of the third filter branch;

inductive cross coupling is respectively performed between a second filter cavity of the third filter branch and a fifth filter cavity of the third filter branch, between the second filter cavity of the third filter branch and a sixth filter cavity of the third filter branch, and between the third filter cavity of the third filter branch and the fifth filter cavity of the third filter branch, so as to form three inductive coupling zeros of the third filter branch;

or the second filtering cavity of the third filtering branch circuit and the fifth filtering cavity of the third filtering branch circuit, and the third filtering cavity of the third filtering branch circuit and the fifth filtering cavity of the third filtering branch circuit are respectively in capacitive cross coupling, so that two capacitive coupling zeros of the third filtering branch circuit are formed.

5. The filter of claim 4, further comprising:

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

the first filtering cavity of the fourth filtering branch to the eighth filtering cavity of the fourth filtering branch are divided into two rows arranged along the first direction, the first filtering cavity, the second filtering cavity and the third filtering cavity of the fourth filtering branch are in one row and are sequentially and adjacently arranged along the second direction, the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the third filtering branch are in one row and are sequentially and adjacently arranged along the second direction, and the third filtering cavity of the third filtering branch is also respectively and adjacently arranged with the fourth filtering cavity of the third filtering branch and the fifth filtering cavity of the third filtering branch; a ninth filter cavity of the fourth filter branch is adjacent to the eighth filter cavity, and the ninth filter cavity of the fourth filter branch is close to the middle branching line of the housing in the first direction relative to the eighth filter cavity of the fourth filter branch;

capacitive cross coupling is respectively performed between a second filter cavity of the fourth filter branch and a fifth filter cavity of the fourth filter branch, between the second filter cavity of the fourth filter branch and a sixth filter cavity of the fourth filter branch, and between a third filter cavity of the fourth filter branch and the fifth filter cavity of the fourth filter branch, so that three capacitive coupling zeros of the fourth filter branch are formed;

or the second filtering cavity of the fourth filtering branch circuit and the fifth filtering cavity of the fourth filtering branch circuit, and the third filtering cavity of the fourth filtering branch circuit and the fifth filtering cavity of the fourth filtering branch circuit are respectively in capacitive cross coupling, so that two capacitive coupling zeros of the fourth filtering branch circuit are formed.

6. The filter of claim 5, further comprising: the fifth filtering branch is arranged on the shell;

the fifth filtering branch consists of eleven filtering cavities which are sequentially coupled along a fifth coupling path, and three coupling zeros of the fifth filtering branch are formed;

the second filter cavity, the third filter cavity, the fifth filter cavity and the sixth filter cavity of the fifth filter branch are arranged in a square shape, the fourth filter cavity of the fifth filter branch is positioned in the center of the square shape, the fourth filter cavity of the fifth filter branch is respectively adjacent to the second filter cavity, the third filter cavity, the fifth filter cavity and the sixth filter cavity of the fifth filter branch, and the second filter cavity of the fifth filter branch is adjacent to the third filter cavity of the fifth filter branch; the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the fifth filtering branch are adjacent in pairs and arranged in a diamond shape; the seventh filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the fifth filtering branch are adjacent in pairs and arranged in a diamond shape; an eleventh filtering cavity of the fifth filtering branch is respectively adjacent to a ninth filtering cavity of the fifth filtering branch and a tenth filtering cavity of the fifth filtering branch, and projections of the ninth filtering cavity and the tenth filtering cavity of the fifth filtering branch in the second direction are overlapped; the first 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;

capacitive cross coupling is respectively performed between a second filter cavity of the fifth filter branch and a fourth filter cavity of the fifth filter branch, between the fourth filter cavity of the fifth filter branch and a sixth filter cavity of the fifth filter branch, and between a seventh filter cavity of the fifth filter branch and a ninth filter cavity of the fifth filter branch, so that three capacitive coupling zeros of the first filter branch are formed; or,

the fifth filtering branch consists of eleven filtering cavities which are sequentially coupled along a fifth coupling path, and four coupling zeros of the fifth filtering branch are formed;

the second filter cavity, the third filter cavity, the fifth filter cavity and the sixth filter cavity of the fifth filter branch are arranged in a square shape, the fourth filter cavity of the fifth filter branch is positioned in the center of the square shape, the fourth filter cavity of the fifth filter branch is respectively adjacent to the second filter cavity, the third filter cavity, the fifth filter cavity and the sixth filter cavity of the fifth filter branch, and the second filter cavity of the fifth filter branch is adjacent to the third filter cavity of the fifth filter branch; the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the ninth filtering cavity of the fifth filtering branch are adjacent in pairs and arranged in a diamond shape; the seventh filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the fifth filtering branch are adjacent in pairs and arranged in a diamond shape; an eleventh filtering cavity of the fifth filtering branch is respectively adjacent to an eighth filtering cavity of the fifth filtering branch and a tenth filtering cavity of the fifth filtering branch, and projections of the eighth filtering cavity and the tenth filtering cavity of the fifth filtering branch in the second direction are overlapped; the first 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;

or the second filter cavity of the fifth filter branch and the fourth filter cavity of the fifth filter branch, the seventh filter cavity of the fifth filter branch and the ninth filter cavity of the fifth filter branch are respectively in capacitive cross coupling to form two capacitive coupling zeros of the fifth filter branch, and the fourth filter cavity of the fifth filter branch and the sixth filter cavity of the fifth filter branch, and the sixth filter cavity of the fifth filter branch and the ninth filter cavity of the fifth filter branch are respectively in inductive cross coupling to form two inductive coupling zeros of the fifth filter branch.

7. The filter of claim 6, further comprising:

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

the first filtering cavity, the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the sixth filtering branch are adjacent in pairs and are arranged in a diamond shape, the third filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the sixth filtering cavity of the sixth filtering branch are adjacent in pairs and are arranged in a diamond shape, the fifth filtering cavity, the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the sixth filtering branch are adjacent in pairs and are arranged in a diamond shape, the seventh filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the sixth filtering branch are adjacent in pairs and are arranged in a diamond shape, wherein the first filtering cavity, the sixth filtering cavity and the ninth filtering cavity of the sixth filtering branch are overlapped in projection in the second direction, the third filtering cavity and the eighth filtering cavity of the sixth filtering branch are overlapped in projection in the second direction, and the second filtering cavity of the sixth filtering branch is overlapped in projection in the second direction, The projections of the fifth filtering cavity and the tenth filtering cavity in the second direction are overlapped; the eleventh filter cavity of the sixth filter branch is adjacent to the ninth filter cavity and the tenth filter cavity of the sixth filter branch, and the eleventh filter cavity of the sixth filter branch is close to the midline of the housing in the second direction relative to the tenth filter cavity of the sixth filter branch;

capacitive cross coupling is respectively performed between a third filter cavity of the sixth filter branch and a fifth filter cavity of the sixth filter branch, between a sixth filter cavity of the sixth filter branch and an eighth filter cavity of the sixth filter branch, and between the eighth filter cavity of the sixth filter branch and a tenth filter cavity of the sixth filter branch, so that three capacitive coupling zeros of the sixth filter branch are formed;

or the third filter cavity of the sixth filter branch and the sixth filter cavity of the sixth filter branch, the sixth filter cavity of the sixth filter branch and the eighth filter cavity of the sixth filter branch are inductively cross-coupled to form two inductive coupling zeros of the sixth filter branch, and the third filter cavity of the sixth filter branch and the fifth filter cavity of the sixth filter branch, and the eighth filter cavity of the sixth filter branch and the tenth filter cavity of the sixth filter branch are capacitively cross-coupled to form two capacitive coupling zeros of the fifth filter branch;

and the structure of the seventh filtering branch is the same as that of the sixth filtering branch.

8. The filter of claim 7, further comprising: the eighth filtering branch is arranged on the shell;

the eighth filtering branch consists of eleven filtering cavities which are sequentially coupled along an eighth coupling path, and three coupling zeros of the eighth filtering branch are formed;

the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the eighth filtering branch are adjacent in pairs and arranged in a diamond shape, the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the eighth filtering branch are adjacent in pairs and arranged in a diamond shape, the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the eighth filtering branch are arranged in a square shape, and the eighth filtering cavity of the eighth filtering branch is positioned in the center of the square shape and is respectively adjacent to the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the eighth filtering branch; the projections of the second filter cavity, the seventh filter cavity and the ninth filter cavity of the eighth filter branch in the first direction are overlapped, the projections of the fifth filter cavity and the eighth filter cavity of the eighth filter branch in the first direction are overlapped, and the projections of the third filter cavity, the sixth filter cavity and the tenth filter cavity of the eighth filter branch in the first direction are overlapped; the first filter cavity of the eighth filter branch is close to the middle branching line of the shell in the first direction relative to the second filter cavity of the eighth filter branch; the tenth filtering cavity of the eighth filtering branch is close to the middle branching line of the shell in the first direction relative to the eleventh filtering cavity of the eighth filtering branch;

capacitive cross coupling is respectively performed between a third filter cavity of the eighth filter branch and a fifth filter cavity of the eighth filter branch, between a sixth filter cavity of the eighth filter branch and an eighth filter cavity of the eighth filter branch, and between the eighth filter cavity of the eighth filter branch and a tenth filter cavity of the eighth filter branch, so that three capacitive coupling zeros of the eighth filter branch are formed; or,

the eighth filtering branch consists of eleven filtering cavities which are sequentially coupled along an eighth coupling path, and four coupling zeros of the eighth filtering branch are formed;

the second filtering cavity, the third filtering cavity, the fourth filtering cavity and the fifth filtering cavity of the eighth filtering branch are adjacent in pairs and arranged in a diamond shape, the third filtering cavity, the fifth filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the eighth filtering branch are adjacent in pairs and arranged in a diamond shape, the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the eighth filtering branch are arranged in directions, and the eighth filtering cavity of the eighth filtering branch is positioned in the center of the square shape and is respectively adjacent to the sixth filtering cavity, the seventh filtering cavity, the ninth filtering cavity and the tenth filtering cavity of the eighth filtering branch; the projections of the second filter cavity, the seventh filter cavity and the ninth filter cavity of the eighth filter branch in the first direction are overlapped, the projections of the third filter cavity and the eighth filter cavity of the eighth filter branch in the first direction are overlapped, and the projections of the fourth filter cavity, the sixth filter cavity and the tenth filter cavity of the eighth filter branch in the first direction are overlapped; the first filter cavity of the eighth filter branch is close to the middle branching line of the shell in the first direction relative to the second filter cavity of the eighth filter branch; the eleventh filter cavity of the eighth filter branch is adjacent to the tenth filter cavity of the eighth filter branch, and the tenth filter cavity of the eighth filter branch is close to the middle dividing line of the housing in the first direction relative to the eleventh filter cavity of the eighth filter branch;

the third filter cavity of the eighth filter branch is capacitively and cross-coupled with the fifth filter cavity of the eighth filter branch, the eighth filter cavity of the eighth filter branch is capacitively and cross-coupled with the tenth filter cavity of the eighth filter branch, so as to form two capacitive coupling zeros of the eighth filter branch, and the third filter cavity of the eighth filter branch is inductively and cross-coupled with the sixth filter cavity of the eighth filter branch, and the sixth filter cavity of the eighth filter branch is inductively and cross-coupled with the eighth filter cavity of the eighth filter branch, so as to form two inductive coupling zeros of the eighth filter branch.

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

the first common cavity is respectively connected with the first filtering cavity of the first filtering branch and the first filtering cavity of the sixth filtering branch;

the second common cavity is respectively connected with the first filtering cavity of the second filtering branch and the first filtering cavity of the seventh filtering branch;

the third common cavity is respectively connected with the first filtering cavity of the third filtering branch and the first filtering cavity of the fifth filtering branch;

and the fourth common cavity is respectively connected with the first filtering cavity of the fourth filtering branch and the first filtering cavity of the eighth filtering branch.

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