CN113054353A

CN113054353A - Filter and communication equipment

Info

Publication number: CN113054353A
Application number: CN201911381056.5A
Authority: CN
Inventors: 蔡永宏; 张海峰; 王磊; 唐梦军
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The application discloses a 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 five filtering cavities which are sequentially coupled along a first coupling path; the second filtering branch is arranged on the shell, consists of eight filtering cavities which are sequentially coupled along a second coupling path, and forms three coupling zeros of the second filtering branch; the first common cavity is arranged on the shell and is respectively coupled with the fifth filtering cavity of the first filtering branch and the eighth filtering cavity of the second filtering branch; the five filter cavities of the first filter branch and the first to sixth filter cavities of the second filter branch are divided into four rows which are sequentially arranged along the second direction. By the mode, the size of the filter can be reduced, the number of taps and welding points is reduced, the production process is simplified, and the cost is saved.

Description

Filter and communication equipment

Technical Field

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

Background

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

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

Disclosure of Invention

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

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

The first filter cavity of the first filter branch, the first filter cavity of the second filter branch and the third filter cavity of the second filter branch are in a row and are sequentially and adjacently arranged along the first direction, the second filter cavity of the first filter branch, the second filter cavity of the second filter branch and the fourth filter cavity of the second filter branch are in a row and are sequentially and adjacently arranged along the first direction, the third filter cavity of the first filter branch, the fourth filter cavity of the first filter branch and the fifth filter cavity of the second filter branch are in a row and are sequentially and adjacently arranged along the first direction, and the fifth filter cavity of the first filter branch and the sixth filter cavity of the second filter branch are in a row and are sequentially and adjacently arranged along the first direction; the second filter cavity of the second filter branch is respectively adjacent to the first filter cavity, the third filter cavity, the fifth filter cavity of the second filter branch and the fourth filter cavity of the first filter branch, and the fourth filter cavity of the first filter branch is respectively adjacent to the fifth filter cavity of the first filter branch and the sixth filter cavity of the second filter branch; the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the second filtering branch are arranged in a pairwise adjacent manner, the projection of the center of the sixth filtering cavity of the second filtering branch in the first direction is located between the projection of the center of the seventh filtering cavity of the second filtering branch and the projection of the center of the eighth filtering cavity of the second filtering branch in the first direction, and the projection of the center of the seventh filtering cavity of the second filtering branch in the second direction is located between the projection of the center of the sixth filtering cavity of the second filtering branch and the projection of the center of the eighth filtering cavity of the second filtering branch in the second direction; the first common cavity is respectively adjacent to a fifth filter cavity of the first filter branch circuit and an eighth filter cavity of the second filter branch circuit; inductive cross coupling is respectively performed between a second filtering cavity of the second filtering branch and a fourth filtering cavity of the second filtering branch, and between the second filtering cavity of the second filtering branch and a fifth filtering cavity of the second filtering branch, so as to form two inductive coupling zeros of the second filtering branch, and capacitive cross coupling is performed between a sixth filtering cavity of the second filtering branch and an eighth filtering cavity of the second filtering branch, so as to form one capacitive coupling zero of the second filtering branch. Five filter cavities of the first filter branch and the first to sixth filter cavities of the second filter branch are arranged in four rows, the four rows of filter cavities are adjacently arranged, the plurality of filter cavities in each row are sequentially adjacently arranged, and the four rows of filter cavities are arranged in a staggered manner, so that the arrangement space of the first filter branch and the second filter branch can be reduced; windows and coupling ribs can be arranged between the second filtering cavity and the fourth filtering cavity and between the second filtering cavity and the fifth filtering cavity respectively, and temperature drift of the second filtering branch can be reduced.

Wherein the filter further comprises: the third filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled along a third coupling path; the fourth filtering branch is arranged on the shell, consists of eight filtering cavities which are sequentially coupled along a fourth coupling path, and forms three coupling zeros of the fourth filtering branch; and the second common cavity is arranged on the shell and is respectively coupled with the fifth filtering cavity of the third filtering branch and the eighth filtering cavity of the fourth filtering branch. The third filtering branch and the fourth filtering branch share the second common cavity and the port, so that the size of the filter can be reduced, the number of taps and tap welding points can be reduced, and the cost of the filter is lowered.

The first filter cavity of the third filter branch is adjacent to the second filter cavity of the third filter branch, and the fourth filter cavity of the third filter branch is adjacent to the third filter cavity and the fifth filter cavity of the third filter branch respectively; the center of the first filter cavity of the third filter branch is located at the center of the fifth filter cavity in the second direction, the projection of the second filter cavity is arranged in sequence in the second direction, the second filter cavity and the third filter cavity of the third filter branch are sequentially close to the middle branch line of the first direction, and the fourth filter cavity and the third filter cavity of the third filter branch are sequentially close to the fifth filter cavity of the third filter branch in the first direction. The cavity arrangement structure can prevent the five filter cavities of the third filter branch circuit from being arranged in a line, and can reduce the arrangement space of the third filter branch circuit along the second direction y.

The eight filter cavities of the fourth filter branch are sequentially and adjacently arranged along the fourth coupling path, the second filter cavity, the third filter cavity, the fourth filter cavity and the fifth filter cavity of the fourth filter branch are arranged in a diamond shape, and the fifth filter cavity, the sixth filter cavity and the eighth filter cavity of the fourth filter branch are arranged in a regular triangle shape; the projections of a first filter cavity, a second filter cavity and a fifth filter cavity of the fourth filter branch in the first direction are overlapped, the projections of a third filter cavity and a sixth filter cavity of the fourth filter branch in the first direction are overlapped, and the projections of a fourth filter cavity and an eighth filter cavity of the fourth filter branch in the first direction are overlapped; the projection of the center of the seventh filter cavity of the fourth filter branch in the first direction is located between the projection of the center of the sixth filter cavity of the fourth filter branch and the projection of the center of the eighth filter cavity of the fourth filter branch in the first direction; the second filter cavity of the fourth filter branch is capacitively cross-coupled with the fourth filter cavity of the fourth filter branch to form a capacitive coupling zero point of the fourth filter branch, and the fifth filter cavity of the fourth filter branch is inductively cross-coupled with the eighth filter cavity of the fourth filter branch, and the sixth filter cavity of the fourth filter branch is inductively cross-coupled with the eighth filter cavity of the fourth filter branch to form two inductive coupling zero points of the fourth filter branch. The four filter cavities of the fourth filter branch are regularly arranged, so that the arrangement space can be reduced; and windows and coupling ribs can be respectively arranged between the fifth filtering cavity and the eighth filtering cavity and between the sixth filtering cavity and the eighth filtering cavity to reduce the temperature drift of the fourth filtering branch.

Wherein the filter further comprises: the fifth filtering branch is arranged on the shell, consists of eleven filtering cavities which are sequentially coupled along a fifth coupling path and forms four inductive coupling zeros of the fifth filtering branch; eleven filter cavities of the fifth filter branch circuit are sequentially and adjacently arranged along the fifth coupling path; the first filtering cavity to the fifth filtering cavity of the fifth filtering branch are arranged in an isosceles trapezoid shape, the sixth filtering cavity to the tenth filtering cavity of the fifth filtering branch are arranged in an isosceles trapezoid shape, the fifth filtering cavity to the seventh filtering cavity of the fifth filtering branch are arranged in a regular triangle shape, the projections of the first filtering cavity, the seventh filtering cavity and the tenth filtering cavity of the fifth filtering branch in the first direction are overlapped, the projections of the second filtering cavity, the sixth filtering cavity and the ninth filtering cavity of the fifth filtering branch in the first direction are overlapped, and the projections of the fourth filtering cavity and the sixth filtering cavity of the fifth filtering branch in the first direction are overlapped; a tenth filtering cavity of the fifth filtering branch is close to a midsplit line of the shell in the first direction and a midsplit line of the shell in the second direction relative to an eleventh filtering cavity of the fifth filtering branch; and four inductive coupling zeros of the fifth filtering branch are formed by inductive cross coupling between the first filtering cavity of the fifth filtering branch and the fourth filtering cavity of the fifth filtering branch, between the second filtering cavity of the fifth filtering branch and the fourth filtering cavity of the fifth filtering branch, between the sixth filtering cavity of the fifth filtering branch and the ninth filtering cavity of the fifth filtering branch, and between the seventh filtering cavity of the fifth filtering branch and the ninth filtering cavity of the fifth filtering branch. Eleven filter cavities of the fifth filter branch are regularly arranged, so that the arrangement space of the fifth filter branch can be reduced; the temperature drift of the fifth filtering branch can be reduced. And the consistency of materials is improved, the process is simplified, and the cost is saved.

Wherein the filter further comprises: the sixth filtering branch is arranged on the shell, consists of eleven filtering cavities which are sequentially coupled along a sixth coupling path and forms four coupling zeros of the sixth filtering branch; eleven filter cavities of the sixth filter branch circuit are sequentially and adjacently arranged along the sixth coupling path; the first filtering cavity to the third filtering cavity of the sixth filtering branch are arranged in an isosceles triangle shape, the third filtering cavity to the fifth filtering cavity of the sixth filtering branch are arranged in a regular triangle shape, the sixth filtering cavity to the seventh filtering cavity of the sixth filtering branch are arranged in an isosceles trapezoid shape, the first filtering cavity, the fifth filtering cavity and the ninth filtering cavity of the sixth filtering branch are overlapped in projection in the first direction, the second filtering cavity and the tenth filtering cavity of the sixth filtering branch are overlapped in projection in the first direction, the third filtering cavity and the sixth filtering cavity of the sixth filtering branch are overlapped in projection in the first direction, and the fourth filtering cavity and the seventh filtering cavity of the sixth filtering branch are overlapped in projection in the first direction; the eleventh filter cavity of the sixth filter branch is also arranged adjacent to the ninth filter cavity of the sixth filter branch, and the ninth filter cavity of the sixth filter branch is close to the mid-splitting line of the housing in the first direction and the mid-splitting line of the housing in the second direction relative to the eleventh filter cavity of the sixth filter branch; the first filter cavity of the sixth filter branch and the third filter cavity of the sixth filter branch are capacitively cross-coupled to form a capacitive coupling zero point 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, the sixth filter cavity of the sixth filter branch and the ninth filter cavity of the sixth filter branch, and the seventh filter cavity of the sixth filter branch and the fourth filter cavity of the sixth filter branch are inductively cross-coupled to form three inductive coupling zero points of the sixth filter branch. Eleven filter cavities of the sixth filter branch are regularly arranged, so that the arrangement space of the sixth filter branch can be reduced; the temperature drift of the sixth filtering branch can be reduced.

The third filtering branch, the fourth filtering branch, the first filtering branch, the second filtering branch, the fifth filtering branch and the sixth filtering branch are sequentially and adjacently arranged along the first direction; the first filter cavity of the first filter branch is overlapped with the second filter cavity of the fourth filter branch in projection in the second direction, and the fifth filter cavity of the fourth filter branch is arranged adjacent to the third filter cavity of the third filter branch and the third filter cavity of the first filter branch; and the projection of a fourth filter cavity of the fifth filter branch and the projection of a first filter cavity of the sixth filter branch in the second direction are overlapped, and the fourth filter cavity of the fifth filter branch and the first filter cavity of the sixth filter branch are adjacently arranged.

Wherein, still be equipped with on the casing: the first port is connected with the first filtering cavity of the first filtering branch and the first filtering cavity of the second filtering branch; the second port is connected with the first filter cavity of the third filter branch and the first filter cavity of the fourth filter branch; the third port is connected with the first filtering cavity of the fifth filtering branch circuit; the fourth port is connected with the first filtering cavity of the sixth filtering branch circuit; a fifth port connected to the first common chamber; a sixth port connected to the second common chamber; a seventh port connected to the eleventh filter cavity of the fifth filter branch; and the eighth port is connected with the eleventh filtering cavity of the sixth filtering branch.

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

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

Drawings

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

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

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

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

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

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

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

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

FIG. 8 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

FIG. 9 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

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

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

FIG. 12 is a diagram illustrating simulation results of an embodiment of the filter of the present application;

fig. 13 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 12, 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 diagram illustrating simulation results of an embodiment of the filter of the present application; FIG. 9 is a diagram illustrating simulation results of an embodiment of the filter of the present application; FIG. 10 is a diagram illustrating simulation results of an embodiment of the filter of the present application; FIG. 11 is a diagram illustrating simulation results of an embodiment of the filter of the present application; FIG. 12 is a diagram illustrating simulation results of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes: the filter comprises a shell 11, a first filtering branch 12, a second filtering branch 13 and a first common cavity AB, 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 shell 11, and the first filtering branch 12 consists of five filtering cavities A1-A5 which are sequentially coupled along a first coupling path; the second filtering branch 13 is arranged on the housing 11, the second filtering branch 13 is composed of eight filtering cavities B1-B8 coupled in sequence along a second coupling path, and the eight filtering cavities B1-B8 of the second filtering branch 13 form three coupling zeros of the second filtering branch 13; the first common cavity AB is disposed on the housing 11 and respectively coupled to the fifth filter cavity a5 of the first filter branch 12 and the eighth filter cavity B8 of the second filter branch 13; wherein the five filter cavities a1-a5 of the first filter branch 12 and the first through sixth filter cavities B1-B6 of the second filter branch 13 are divided into three columns arranged along the second direction y.

As shown in fig. 1, the five filter cavities a1-a5 of the first filter branch 12 include: a first filter cavity A1, a second filter cavity A2, a third filter cavity A3, a fourth filter cavity A4 and a fifth filter cavity A5; the eight filter cavities B1-B8 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 and an eighth filter cavity B8.

Different from the prior art, the first filtering branch 12 and the second filtering branch 13 of the filter 10 of this embodiment share the first common cavity AB, so that the size of the filter 10 can be reduced, and the first filtering branch 12 and the second filtering branch 13 can be connected to the common port through the first common cavity AB, without respectively providing ports for the first filtering branch 12 and the second filtering branch 13, thereby reducing the number of taps and tap welding points, and thus reducing the cost of the filter 10 and improving the configuration flexibility thereof; and the five filter cavities a1-a5 of the first filter branch 12 and the first filter cavity B1 to the sixth filter cavity B6 of the second filter branch 13 are divided into three rows arranged along the second direction y, so that the filter cavities are regularly arranged, the size of the filter 10 can be reduced, the production process can be simplified, and the cost can be saved.

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

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

the second filtering cavity B2 of the second filtering branch 13 is further respectively adjacent to the first filtering cavity B1, the third filtering cavity B3, the fifth filtering cavity B5 of the second filtering branch 13 and the fourth filtering cavity a4 of the first filtering branch 12, and the fourth filtering cavity a4 of the first filtering branch 12 is further respectively adjacent to the fifth filtering cavity a5 of the first filtering branch 12 and the sixth filtering cavity B6 of the second filtering branch 13; the sixth filtering cavity B6, the seventh filtering cavity B7 and the eighth filtering cavity B8 of the second filtering branch 13 are disposed adjacent to each other, a projection of a center of the sixth filtering cavity B6 of the second filtering branch 13 in the first direction x is located between a center of the seventh filtering cavity B7 of the second filtering branch 13 and a projection of a center of the eighth filtering cavity B8 of the second filtering branch 13 in the first direction x, and a projection of a center of the seventh filtering cavity B7 of the second filtering branch 13 in the second direction y is located between a center of the sixth filtering cavity B6 of the second filtering branch 13 and a projection of a center of the eighth filtering cavity B8 of the second filtering branch 13 in the second direction y.

From the above analysis, it can be known that the five filter cavities a1-a5 of the first filter branch 12 and the first filter cavity B1 to the sixth filter cavity B6 of the second filter branch 13 are arranged in four rows, and the four rows of filter cavities are adjacent to each other, and a plurality of filter cavities in each row are adjacent to each other in sequence, and the four rows of filter cavities are staggered to reduce the arrangement space of the first filter branch 12 and the second filter branch 13.

As shown in fig. 1, the first common cavity AB is disposed adjacent to the fifth filter cavity a5 of the first filter branch 12 and the eighth filter cavity B8 of the second filter branch 13, respectively. Specifically, the first common cavity AB is respectively intersected with the fifth filtering cavity a5 of the first filtering branch 12 and the eighth filtering cavity B8 of the second filtering branch 13, so that a partition wall is required to be arranged between two sequentially coupled filtering cavities in a traditional filter, and then a coupling window is formed in the partition wall, so that materials are reduced, and the processing is convenient.

As shown in fig. 2, the first filtering branch 12 has no cross coupling, and adopts pure window coupling, so that the window coupling has good consistency and low cost, and no other material (e.g. inductive cross-coupled material) needs to be arranged.

Optionally, as shown in fig. 1, the second filter cavity B2 of the second filter branch 13 and the fourth filter cavity B4 of the first filter branch 12, and the second filter cavity B2 of the second filter branch 13 and the fifth filter cavity B5 of the second filter branch 13 are inductively cross-coupled to form two inductively coupled zeros of the second filter branch 13, respectively; the sixth filter cavity B6 of the second filter branch 13 and the eighth filter cavity B8 of the second filter branch 13 are capacitively cross-coupled to form a capacitive coupling zero of the second filter branch 13.

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

Generally, the inductive coupling zero point is realized by a window, and a metal coupling rib is arranged on the window. Namely, windows and coupling ribs (not shown, shown by dotted lines) are respectively arranged between the second filter cavity B2 and the fourth filter cavity B4 and between the second filter cavity B2 and the fifth filter cavity B5; in this embodiment, the inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is less subject to the change of the external temperature, so that the temperature drift of the second filtering branch 13 can be reduced.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. As shown in fig. 3, a fly rod (not shown, shown in dotted lines) is disposed between the sixth filter chamber B6 and the eighth filter chamber B8.

Optionally, as shown in fig. 1, the filter 10 further includes: and the third filtering branch 14 consists of five filtering cavities C1-C5 which are sequentially coupled along a third coupling path.

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

The first filtering cavity C1 of the third filtering branch 14 is adjacent to the second filtering cavity C2 of the third filtering branch 14, and the fourth filtering cavity C4 of the third filtering branch 14 is adjacent to the third filtering cavity C3 and the fifth filtering cavity C5 of the third filtering branch 14, respectively; the projections of the center of the first filter cavity C1 of the third filter branch 14 to the center of the fifth filter cavity C5 in the second direction y are sequentially arranged along the second direction y, the second filter cavity C2 and the third filter cavity C3 of the third filter branch 14 are sequentially close to the bisector of the housing 11 in the first direction x relative to the first filter cavity C1 of the third filter branch 14, and the fourth filter cavity C4 and the third filter cavity C3 of the third filter branch 14 are sequentially close to the bisector of the housing 11 in the first direction x relative to the fifth filter cavity C5 of the third filter branch 14. The cavity-row structure can prevent the five filter cavities C1-C5 of the third filter branch 14 from being arranged in a line, and can reduce the arrangement space of the third filter branch 14 along the second direction y.

As shown in fig. 4, the third filtering branch 14 has no cross coupling, and adopts pure window coupling, so that the window coupling has good consistency and low cost, and no other material (e.g., inductive cross-coupled material) needs to be arranged.

Optionally, as shown in fig. 1, the filter 10 further includes: a fourth filtering branch 15, where the fourth filtering branch 15 is composed of eight filtering cavities D1-D8 coupled in sequence along a fourth coupling path, and forms three coupling zeros of the fourth filtering branch 15.

Wherein, the eight filter cavities D1-D8 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 and an eighth filter cavity D8.

As shown in fig. 1, the eight filter cavities D1-D8 of the fourth filter branch 15 are sequentially and adjacently disposed along a fourth coupling path, the second filter cavity D2, the third filter cavity D3, the fourth filter cavity D4 and the fifth filter cavity D5 of the fourth filter branch 15 are disposed in a diamond shape, and the fifth filter cavity D5, the sixth filter cavity D6 and the eighth filter cavity D8 of the fourth filter branch 15 are disposed in a regular triangle shape; the projections of the first filter cavity D1, the second filter cavity D2 and the fifth filter cavity D5 of the fourth filter branch 15 in the first direction x are overlapped, the projections of the third filter cavity D3 and the sixth filter cavity D6 of the fourth filter branch 15 in the first direction x are overlapped, and the projections of the fourth filter cavity D4 and the eighth filter cavity D8 of the fourth filter branch 15 in the first direction x are overlapped; the projection of the center of the seventh filter cavity D7 of the fourth filter branch 15 in the first direction x is located between the center of the sixth filter cavity D6 of the fourth filter branch 15 and the projection of the center of the eighth filter cavity D8 of the fourth filter branch 15 in the first direction x; the four filter cavities D1-D4 of the fourth filter branch 15 are regularly arranged, so that the arrangement space can be reduced.

As shown in fig. 1, the second filter cavity D2 of the fourth filter branch 15 and the fourth filter cavity D4 of the fourth filter branch 15 are capacitively cross-coupled to form a capacitive coupling zero point of the fourth filter branch 15, and the fifth filter cavity D5 of the fourth filter branch 15 and the eighth filter cavity D8 of the fourth filter branch 15, and the sixth filter cavity D6 of the fourth filter branch 15 and the eighth filter cavity D8 of the fourth filter branch 15 are inductively cross-coupled to form two inductive coupling zero points of the fourth filter branch 15, respectively.

As shown in fig. 5, windows and coupling ribs (not shown, shown by dotted lines) may be respectively disposed between the fifth filter cavity D5 and the eighth filter cavity D8, and between the sixth filter cavity D6 and the eighth filter cavity D8; in the embodiment, the inductive cross coupling is realized through the metal coupling rib, the metal coupling rib is slightly changed by the external temperature, and the temperature drift of the fourth filtering branch 15 can be reduced; a fly rod (not shown, shown in phantom) may be disposed between second filter chamber D2 and fourth filter chamber D4.

Optionally, as shown in fig. 1, the filter 10 further includes: a second common cavity CD, provided in the housing 11, is coupled to the fifth filtering cavity C5 of the third filtering branch 14 and the eighth filtering cavity D8 of the fourth filtering branch 15, respectively.

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

As shown in fig. 1, the second common cavity CD is respectively intersected with the fifth filtering cavity C5 of the third filtering branch 14 and the eighth filtering cavity D8 of the fourth filtering branch 15, so that a partition wall is not required to be arranged between two sequentially coupled filtering cavities in a conventional filter, and then a coupling window is formed on the partition wall, so that materials are reduced, and the processing is convenient.

Optionally, as shown in fig. 1, the filter cavity 10 further includes: and the fifth filtering branch 16 is arranged on the shell 11, consists of eleven filtering cavities E1-E11 which are sequentially coupled along the fifth coupling path, and forms four inductive coupling zeros of the fifth filtering branch 16.

As shown in fig. 1, the eleven filter cavities E1-E11 of the fifth filter branch 16 include: the filter comprises a first filter cavity E1, a second filter cavity E2, a third filter cavity E3, a fourth filter cavity E4, a fifth filter cavity E, a sixth filter cavity E6, a seventh filter cavity E7, an eighth filter cavity E8, a ninth filter cavity E9, a tenth filter cavity E10 and an eleventh filter cavity E11.

As shown in fig. 1, eleven filter cavities E1-E11 of the fifth filter branch 16 are arranged adjacently in sequence along the fifth coupling path; the first filter cavity E1 to the fifth filter cavity E5 of the fifth filter branch 16 are arranged in an isosceles trapezoid, the sixth filter cavity E6 to the tenth filter cavity E10 of the fifth filter branch 16 are arranged in an isosceles trapezoid, the fifth filter cavity E5 to the seventh filter cavity E7 of the fifth filter branch 16 are arranged in an equilateral triangle, the first filter cavity E1, the seventh filter cavity E7 and the tenth filter cavity E10 of the fifth filter branch 16 overlap in projection in the first direction x, the second filter cavity E2, the sixth filter cavity E6 and the ninth filter cavity E9 of the fifth filter branch 16 overlap in projection in the first direction x, and the fourth filter cavity E4 and the sixth filter cavity E6 of the fifth filter branch 16 overlap in projection in the first direction x; the tenth filter chamber E10 of the fifth filter branch 16 is located closer to the housing 11 in the first direction x than to the housing x in the second direction y with respect to the eleventh filter chamber E11 of the fifth filter branch 16. Eleven filter cavities E1-E11 of the fifth filter branch 16 are regularly arranged, so that the arrangement space of the fifth filter branch 16 can be reduced.

As shown in fig. 1, four inductive coupling zeros of the fifth filter branch 16 are formed by inductive cross coupling between the first filter cavity E1 of the fifth filter branch 16 and the fourth filter cavity E4 of the fifth filter branch 16, 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 sixth filter cavity E6 of the fifth filter branch 16 and the ninth filter cavity E9 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, respectively.

As shown in fig. 6, windows and coupling ribs (not shown, indicated by dashed lines) may be respectively disposed between the first filter cavity E1 and the fourth filter cavity E4, between the second filter cavity E2 and the fourth filter cavity E4, between the sixth filter cavity E6 and the ninth filter cavity E9, and between the seventh filter cavity E7 and the ninth filter cavity E9; in the embodiment, the inductive cross coupling is realized through the metal coupling rib, and the metal coupling rib is subjected to small change of the external temperature, so that the temperature drift of the fifth filtering branch 16 can be reduced; and the coupling zero points of the fifth filtering branch 16 are all inductive coupling zero points, so that the consistency of materials can be improved, the process is simplified, and the cost is saved.

Optionally, as shown in fig. 1, the filter cavity 10 further includes: and the sixth filtering branch 17 is arranged on the shell 11, consists of eleven filtering cavities F1-F11 which are sequentially coupled along the sixth coupling path, and forms four coupling zeros of the sixth filtering branch 17.

The eleven filter cavities F1-F11 of the sixth filter branch 17 include: a first filter cavity F1, a second filter cavity F2, a third filter cavity F3, a fourth filter cavity F4, a fifth filter cavity F4, a sixth filter cavity F6, a seventh filter cavity F7, an eighth filter cavity F8, a ninth filter cavity F9, a tenth filter cavity F10 and an eleventh filter cavity F11.

Eleven filter cavities F1-F11 of the sixth filter branch 17 are arranged adjacently in sequence along the sixth coupling path; the first filter cavity F1 to the third filter cavity F3 of the sixth filter branch 17 are arranged in an isosceles triangle, the third filter cavity F3 to the fifth filter cavity F5 of the sixth filter branch 17 are arranged in a regular triangle, the sixth filter cavity F6 to the seventh filter cavity F7 of the sixth filter branch 17 are arranged in an isosceles trapezoid, and the first filter cavity F1, the fifth filter cavity F5 and the ninth filter cavity F9 of the sixth filter branch 17 overlap in projection in the first direction x, the second filter cavity F2 and the tenth filter cavity F10 of the sixth filter branch 17 overlap in projection in the first direction x, the third filter cavity F3 and the sixth filter cavity F6 of the sixth filter branch 17 overlap in projection in the first direction x, and the fourth filter cavity F4 and the seventh filter cavity F7 of the sixth filter branch 17 overlap in projection in the first direction x; the eleventh filter cavity F11 of the sixth filter branch 17 is further disposed adjacent to the ninth filter cavity F9 of the sixth filter branch 17, and the ninth filter cavity F9 of the sixth filter branch 17 is closer to the center-splitting line of the housing 11 in the first direction x and the center-splitting line of the housing 11 in the second direction y with respect to the eleventh filter cavity F11 of the sixth filter branch 17. Eleven filter cavities F1-F11 of the sixth filter branch 17 are regularly arranged, so that the arrangement space of the sixth filter branch 17 can be reduced.

As shown in fig. 1, the first filter cavity F1 and the third filter cavity F3 of the sixth filter branch 17 are capacitively cross-coupled to form a capacitive coupling zero of the sixth filter branch 17, the third filter cavity F3 and the fifth filter cavity F5 of the sixth filter branch 17, the sixth filter cavity F6 and the ninth filter cavity F9 of the sixth filter branch 17, and the seventh filter cavity F7 and the fourth filter cavity F4 of the sixth filter branch 17 are inductively cross-coupled to form three inductive coupling zeros of the sixth filter branch 17.

As shown in fig. 7, windows and coupling ribs (not shown, indicated by dashed lines) may be respectively disposed between the third filter cavity F3 and the fifth filter cavity F5, between the sixth filter cavity F6 and the ninth filter cavity F9, and between the seventh filter cavity F7 and the fourth filter cavity F4; in the embodiment, the inductive cross coupling is realized through the metal coupling rib, the metal coupling rib is slightly changed by the external temperature, and the temperature drift of the sixth filtering branch 17 can be reduced; a fly rod (not shown, shown in phantom) is disposed between the first filter chamber F1 and the third filter chamber F3.

As shown in fig. 1, the housing 11 is further provided with a first port (not shown), which is connected to the first filtering cavity a1 of the first filtering branch 11 and the first filtering cavity B1 of the second filtering branch 13, and the first filtering branch 11 and the second filtering branch 13 share the first port, so that the size of the filter 10 can be reduced, clinker at a tap and a welding point can be reduced, and cost can be saved; the second port (not shown) is connected with the first filtering cavity C1 of the third filtering branch 14 and the first filtering cavity D1 of the fourth filtering branch 15, and the fourth filtering branch 15 of the third filtering branch 14 shares the second port, so that the size of the filter 10 can be reduced, clinker at a tap and a welding point can be reduced, and the cost can be saved; a third port (not shown) connected to the first filter cavity E1 of the fifth filter branch 16; a fourth port (not shown) connected to the first filter cavity F1 of the sixth filter branch 17; a fifth port (not shown) connected to the first common chamber AB; a sixth port (not shown) connected to the second common chamber CD; a seventh port (not shown) connected to the eleventh filter cavity E11 of the fifth filter branch 16; an eighth port (not shown) is connected to the eleventh filter cavity F11 of the sixth filter branch 17.

The first port to the fourth port are input ports, and the fifth port to the eighth port are output ports; the port is used for filtering signal transmission; the ports may each be taps.

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

As shown in fig. 1, in the first filter branch 12, the coupling bandwidth between the first port of the present embodiment and the first filter cavity a1 is in the range of 19MHz-23 MHz; the coupling bandwidth between the first filter cavity A1 and the second filter cavity A2 ranges from 16MHz to 20 MHz; the coupling bandwidth between the second filter cavity A2 and the third filter cavity A3 ranges from 11MHz to 15 MHz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 ranges from 11MHz to 15 MHz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 ranges from 16MHz to 20 MHz; the coupling bandwidth between the fifth filter cavity a5 and the fifth port is in the range of 19MHz-23MHz, which can meet the design requirement.

The resonant frequencies of the first filter cavity a1 to the fifth filter cavity a5 of the first filter branch 12 are sequentially in the following ranges: 2017MHz-2019MHz, 2017MHz-2019MHz and 2017MHz-2019 MHz.

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

As shown in fig. 8, the bandwidth of the first filter branch 12 is: 2009-2026MHz, the band curve of which is shown as S1, the rejection of the first filter branch 12 satisfies: 1990MHz > 25dB, 2045MHz > 25 dB.

The above-mentioned filtering parameters and simulation results of the third filtering branch 14 are the same as those of the first filtering branch 12, and are not described herein again.

As shown in fig. 1, in the second filter branch 13, the coupling bandwidth between the first port of the present embodiment and the first filter cavity B1 is in the range of 30MHz-34 MHz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 ranges from 24MHz to 28 MHz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 ranges from 16MHz to 20 MHz; the coupling bandwidth between the second filter cavity B2 and the fourth filter cavity B4 ranges from (-4) MHz to 0 MHz; the coupling bandwidth between the second filter cavity B2 and the fifth filter cavity B5 is in the range of (-6) MHz- (-2) MHz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 ranges from 19MHz to 23 MHz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 ranges from 14MHz to 18 MHz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 ranges from 15MHz to 19 MHz; the coupling bandwidth between the sixth filtering cavity B6 and the seventh filtering cavity B7 ranges from 11MHz to 15 MHz; the coupling bandwidth between the sixth filter cavity B6 and the eighth filter cavity B8 ranges from 14MHz to 18 MHz; the coupling bandwidth between the seventh filtering cavity B7 and the eighth filtering cavity B8 ranges from 19MHz to 23 MHz; the coupling bandwidth between the eighth filtering cavity B8 and the fifth port is in the range of 30MHz-34MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity B1 to the eighth filtering cavity B8 of the second filter branch 13 are sequentially in the following ranges: 1899MHz-1901MHz, 1897MHz-1899MHz, 1900MHz-1902MHz, 1899MHz-1901MHz, 1910MHz-1912MHz, and 1899MHz-1901 MHz.

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

As shown in fig. 9, the bandwidth of the second filter branch 13 is: 1884-: a. b, c, the rejection of the second filter branch 13 satisfies: 1880MHz is more than 35dB and 1920MHz is more than 45 dB.

As shown in fig. 1, in the fourth filter branch 15, the coupling bandwidth between the second port and the first filter cavity D1 of the present embodiment is in the range of 30MHz to 34 MHz; the coupling bandwidth between the first filter cavity D1 and the second filter cavity D2 is in the range of 24MHz-28 MHz; the coupling bandwidth between the second filter cavity D2 and the third filter cavity D3 ranges from 15MHz to 19 MHz; the coupling bandwidth between the second filter cavity D2 and the fourth filter cavity D4 ranges from 7MHz to 11 MHz; the coupling bandwidth between the third filter cavity D3 and the fourth filter cavity D4 ranges from 13MHz to 17 MHz; the coupling bandwidth between the fourth filter cavity D4 and the fifth filter cavity D5 ranges from 15MHz to 19 MHz; the coupling bandwidth between the fifth filter cavity D5 and the sixth filter cavity D6 is in the range of (-11) MHz- (-7) MHz; the coupling bandwidth between the fifth filtering cavity D5 and the eighth filtering cavity D8 ranges from 22MHz to 26 MHz; the coupling bandwidth between the sixth filtering cavity D6 and the seventh filtering cavity D7 ranges from 0MHz to 4 MHz; the coupling bandwidth between the sixth filtering cavity D6 and the eighth filtering cavity D8 ranges from 14MHz to 18 MHz; the coupling bandwidth between the seventh filter cavity D7 and the eighth filter cavity D8 ranges from 23MHz to 27 MHz; the coupling bandwidth between the eighth filter cavity D8 and the sixth port ranges from 30MHz to 34MHz, which can meet the design requirement.

The resonant frequencies of the first filtering cavity D1 to the eighth filtering cavity D8 of the fourth filter branch 15 are sequentially in the following ranges: 1899MHz-1901MHz, 1907MHz-1909MHz, 1899MHz-1901MHz, 1898MHz-1900MHz, 1901MHz-1902MHz, and 1899MHz-1901 MHz.

As shown in fig. 10, the bandwidth of the fourth filter branch 15 is: 1884-: d. e, f, the suppression of the fourth filter branch 15 satisfies: 1880MHz is more than 35dB and 1920MHz is more than 45 dB.

As shown in fig. 1, in the fifth filter branch 16, the coupling bandwidth between the third port and the first filter cavity E1 of the present embodiment is in the range of 162MHz-166 MHz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 ranges from 127MHz to 131 MHz; the coupling bandwidth between the first filter cavity E1 and the fourth filter cavity E4 is in the range of (-40) MHz- (-36) MHz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 ranges from 117MHz to 121 MHz; the coupling bandwidth between the second filter cavity E2 and the fourth filter cavity E4 is in the range of (-7) MHz- (-3) MHz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 ranges from 77MHz to 81 MHz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 ranges from 83MHz to 87 MHz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 ranges from 82MHz to 84 MHz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 ranges from 76MHz to 80 MHz; the coupling bandwidth between the sixth filter cavity E6 and the ninth filter cavity E9 is in the range of (-34) MHz- (-30) MHz; the coupling bandwidth between the seventh filter cavity E7 and the eighth filter cavity E8 ranges from 115MHz to 119 MHz; the coupling bandwidth between the seventh filter cavity E7 and the ninth filter cavity E9 ranges from (-3) MHz to 1 MHz; the coupling bandwidth between the eighth filter cavity E8 and the ninth filter cavity E9 ranges from 80MHz to 84 MHz; the coupling bandwidth between the ninth filter cavity E9 and the tenth filter cavity E10 ranges from 93MHz to 97 MHz; the coupling bandwidth between the tenth filter cavity E10 and the eleventh filter cavity E11 ranges from 132MHz to 136 MHz; the coupling bandwidth between the eleventh filter cavity E11 and the seventh port ranges from 162MHz to 166MHz, 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: 2593MHz-2595MHz, 2594MHz-2596MHz, 2588MHz-2590MHz, 2593MHz-2595MHz, 2592MHz-2594MHz, 2593MHz-2595MHz and 2593MHz-2595 MHz.

As shown in fig. 11, the bandwidth of the fifth filter branch 16 is: 2514 and 2676MHz, the frequency band curve is shown as S4, the coupling zero point includes: g. h, i, j, the suppression of the fifth filter branch 16 satisfies: 2500MHz is more than 60dB, 2505MHz is more than 20dB, 2685MHz is more than 20dB, 2700MHz is more than 60 dB.

As shown in fig. 1, in the sixth filter branch 17, the coupling bandwidth between the fourth input port of the present embodiment and the first filter cavity F1 is in the range of 162MHz-166 MHz; the coupling bandwidth between the first filter cavity F1 and the second filter cavity F2 ranges from 113MHz to 115 MHz; the coupling bandwidth between the first filter cavity F1 and the fourth filter cavity F4 ranges from 68MHz to 72 MHz; the coupling bandwidth between the second filter cavity F2 and the third filter cavity F3 is in the range of 74MHz-78 MHz; the coupling bandwidth between the second filter cavity F2 and the fourth filter cavity F4 is in the range of 74MHz-78 MHz; the coupling bandwidth between the third filter cavity F3 and the fourth filter cavity F4 is in the range of (-48) MHz- (-44) MHz; the coupling bandwidth between the fourth filter cavity F4 and the fifth filter cavity F5 ranges from 69MHz to 73 MHz; the coupling bandwidth between the fifth filter cavity F5 and the sixth filter cavity F6 ranges from 82MHz to 84 MHz; the coupling bandwidth between the sixth filter cavity F6 and the seventh filter cavity F7 ranges from 76MHz to 80 MHz; the coupling bandwidth between the sixth filter cavity F6 and the ninth filter cavity F9 is in the range of (-34) MHz- (-30) MHz; the coupling bandwidth between the seventh filter cavity F7 and the eighth filter cavity F8 ranges from 115MHz to 119 MHz; the coupling bandwidth between the seventh filter cavity F7 and the ninth filter cavity F9 ranges from (-3) MHz to 1 MHz; the coupling bandwidth between the eighth filter cavity F8 and the ninth filter cavity F9 ranges from 80MHz to 84 MHz; the coupling bandwidth between the ninth filter cavity F9 and the tenth filter cavity F10 ranges from 93MHz to 97 MHz; the coupling bandwidth between the tenth filter cavity F10 and the eleventh filter cavity F11 ranges from 132MHz to 136 MHz; the coupling bandwidth between the eleventh filter cavity F11 and the sixth output port is in the range of 162MHz-166MHz, 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: 2593MHz-2595MHz, 2642MHz-2644MHz, 2587MHz-2589MHz, 2547MHz-2549MHz, 2593MHz-2595MHz, 2592MHz-2594MHz, 2593MHz-2595MHz and 2593MHz-2595 MHz.

As shown in fig. 12, the bandwidth of the sixth filter branch 17 is: 2514 and 2676MHz, the frequency band curve is shown as S5, the coupling zero point includes: k. l, m, n, the suppression of the sixth filter branch 17 satisfies: 2500MHz is more than 60dB, 2505MHz is more than 20dB, 2685MHz is more than 20dB, 2700MHz is more than 60 dB.

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. 13, fig. 13 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device of the present embodiment includes an antenna 32 and a radio frequency unit 31 connected to the antenna 32, the radio frequency unit 31 includes a filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering a radio frequency signal.

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

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

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

Claims

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

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

the first filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled along a first coupling path;

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

the first common cavity is arranged on the shell and is respectively coupled with the fifth filtering cavity of the first filtering branch circuit and the eighth filtering cavity of the second filtering branch circuit;

and the five filter cavities of the first filter branch and the first to sixth filter cavities of the second filter branch are divided into four rows which are sequentially arranged along the second direction.

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

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

the sixth filtering cavity, the seventh filtering cavity and the eighth filtering cavity of the second filtering branch are arranged in a pairwise adjacent manner, the projection of the center of the sixth filtering cavity of the second filtering branch in the first direction is located between the projection of the center of the seventh filtering cavity of the second filtering branch and the projection of the center of the eighth filtering cavity of the second filtering branch in the first direction, and the projection of the center of the seventh filtering cavity of the second filtering branch in the second direction is located between the projection of the center of the sixth filtering cavity of the second filtering branch and the projection of the center of the eighth filtering cavity of the second filtering branch in the second direction;

the first common cavity is respectively adjacent to a fifth filter cavity of the first filter branch circuit and an eighth filter cavity of the second filter branch circuit;

inductive cross coupling is respectively performed between a second filtering cavity of the second filtering branch and a fourth filtering cavity of the second filtering branch, and between the second filtering cavity of the second filtering branch and a fifth filtering cavity of the second filtering branch, so as to form two inductive coupling zeros of the second filtering branch, and capacitive cross coupling is performed between a sixth filtering cavity of the second filtering branch and an eighth filtering cavity of the second filtering branch, so as to form one capacitive coupling zero of the second filtering branch.

3. The filter of claim 2, further comprising:

the third filtering branch is arranged on the shell and consists of five filtering cavities which are sequentially coupled along a third coupling path;

the fourth filtering branch is arranged on the shell, consists of eight filtering cavities which are sequentially coupled along a fourth coupling path, and forms three coupling zeros of the fourth filtering branch;

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

4. The filter according to claim 3, wherein the first filter cavity of the third filter branch is disposed adjacent to the second filter cavity of the third filter branch, and the fourth filter cavity of the third filter branch is disposed adjacent to the third filter cavity and the fifth filter cavity of the third filter branch, respectively;

the center of the first filter cavity of the third filter branch is located at the center of the fifth filter cavity in the second direction, the projection of the second filter cavity is arranged in sequence in the second direction, the second filter cavity and the third filter cavity of the third filter branch are sequentially close to the middle branch line of the first direction, and the fourth filter cavity and the third filter cavity of the third filter branch are sequentially close to the fifth filter cavity of the third filter branch in the first direction.

5. The filter according to claim 4, wherein the eight filter cavities of the fourth filter branch are sequentially arranged adjacently along the fourth coupling path, and the second filter cavity, the third filter cavity, the fourth filter cavity and the fifth filter cavity of the fourth filter branch are arranged in a diamond shape, and the fifth filter cavity, the sixth filter cavity and the eighth filter cavity of the fourth filter branch are arranged in a regular triangle; the projections of a first filter cavity, a second filter cavity and a fifth filter cavity of the fourth filter branch in the first direction are overlapped, the projections of a third filter cavity and a sixth filter cavity of the fourth filter branch in the first direction are overlapped, and the projections of a fourth filter cavity and an eighth filter cavity of the fourth filter branch in the first direction are overlapped;

the projection of the center of the seventh filter cavity of the fourth filter branch in the first direction is located between the projection of the center of the sixth filter cavity of the fourth filter branch and the projection of the center of the eighth filter cavity of the fourth filter branch in the first direction;

the second filter cavity of the fourth filter branch is capacitively cross-coupled with the fourth filter cavity of the fourth filter branch to form a capacitive coupling zero point of the fourth filter branch, and the fifth filter cavity of the fourth filter branch is inductively cross-coupled with the eighth filter cavity of the fourth filter branch, and the sixth filter cavity of the fourth filter branch is inductively cross-coupled with the eighth filter cavity of the fourth filter branch to form two inductive coupling zero points of the fourth filter branch.

6. The filter of any one of claims 1 to 5, further comprising:

the fifth filtering branch is arranged on the shell, consists of eleven filtering cavities which are sequentially coupled along a fifth coupling path and forms four inductive coupling zeros of the fifth filtering branch;

eleven filter cavities of the fifth filter branch circuit are sequentially and adjacently arranged along the fifth coupling path; the first filtering cavity to the fifth filtering cavity of the fifth filtering branch are arranged in an isosceles trapezoid shape, the sixth filtering cavity to the tenth filtering cavity of the fifth filtering branch are arranged in an isosceles trapezoid shape, the fifth filtering cavity to the seventh filtering cavity of the fifth filtering branch are arranged in a regular triangle shape, the projections of the first filtering cavity, the seventh filtering cavity and the tenth filtering cavity of the fifth filtering branch in the first direction are overlapped, the projections of the second filtering cavity, the sixth filtering cavity and the ninth filtering cavity of the fifth filtering branch in the first direction are overlapped, and the projections of the fourth filtering cavity and the sixth filtering cavity of the fifth filtering branch in the first direction are overlapped;

a tenth filtering cavity of the fifth filtering branch is close to a midsplit line of the shell in the first direction and a midsplit line of the shell in the second direction relative to an eleventh filtering cavity of the fifth filtering branch;

and four inductive coupling zeros of the fifth filtering branch are formed by inductive cross coupling between the first filtering cavity of the fifth filtering branch and the fourth filtering cavity of the fifth filtering branch, between the second filtering cavity of the fifth filtering branch and the fourth filtering cavity of the fifth filtering branch, between the sixth filtering cavity of the fifth filtering branch and the ninth filtering cavity of the fifth filtering branch, and between the seventh filtering cavity of the fifth filtering branch and the ninth filtering cavity of the fifth filtering branch.

7. The filter of claim 6, further comprising:

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

eleven filter cavities of the sixth filter branch circuit are sequentially and adjacently arranged along the sixth coupling path; the first filtering cavity to the third filtering cavity of the sixth filtering branch are arranged in an isosceles triangle shape, the third filtering cavity to the fifth filtering cavity of the sixth filtering branch are arranged in a regular triangle shape, the sixth filtering cavity to the seventh filtering cavity of the sixth filtering branch are arranged in an isosceles trapezoid shape, the first filtering cavity, the fifth filtering cavity and the ninth filtering cavity of the sixth filtering branch are overlapped in projection in the first direction, the second filtering cavity and the tenth filtering cavity of the sixth filtering branch are overlapped in projection in the first direction, the third filtering cavity and the sixth filtering cavity of the sixth filtering branch are overlapped in projection in the first direction, and the fourth filtering cavity and the seventh filtering cavity of the sixth filtering branch are overlapped in projection in the first direction;

the eleventh filter cavity of the sixth filter branch is also arranged adjacent to the ninth filter cavity of the sixth filter branch, and the ninth filter cavity of the sixth filter branch is close to the mid-splitting line of the housing in the first direction and the mid-splitting line of the housing in the second direction relative to the eleventh filter cavity of the sixth filter branch;

the first filter cavity of the sixth filter branch and the third filter cavity of the sixth filter branch are capacitively cross-coupled to form a capacitive coupling zero point 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, the sixth filter cavity of the sixth filter branch and the ninth filter cavity of the sixth filter branch, and the seventh filter cavity of the sixth filter branch and the fourth filter cavity of the sixth filter branch are inductively cross-coupled to form three inductive coupling zero points of the sixth filter branch.

8. The filter according to claim 7, wherein the third filtering branch, the fourth filtering branch, the first filtering branch, the second filtering branch, the fifth filtering branch and the sixth filtering branch are sequentially and adjacently arranged along the first direction;

the first filter cavity of the first filter branch is overlapped with the second filter cavity of the fourth filter branch in projection in the second direction, and the fifth filter cavity of the fourth filter branch is arranged adjacent to the third filter cavity of the third filter branch and the third filter cavity of the first filter branch;

and the projection of a fourth filter cavity of the fifth filter branch and the projection of a first filter cavity of the sixth filter branch in the second direction are overlapped, and the fourth filter cavity of the fifth filter branch and the first filter cavity of the sixth filter branch are adjacently arranged.

9. The filter of claim 7, wherein the housing further comprises:

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

the second port is connected with the first filter cavity of the third filter branch and the first filter cavity of the fourth filter branch;

the third port is connected with the first filtering cavity of the fifth filtering branch circuit;

the fourth port is connected with the first filtering cavity of the sixth filtering branch circuit;

a fifth port connected to the first common chamber;

a sixth port connected to the second common chamber;

a seventh port connected to the eleventh filter cavity of the fifth filter branch;

and the eighth port is connected with the eleventh filtering cavity of the sixth 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.