CN113054375A

CN113054375A - Communication device and filter thereof

Info

Publication number: CN113054375A
Application number: CN201911383508.3A
Authority: CN
Inventors: 张海峰; 杨绍春; 王磊; 谢新成
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 communication device and a filter thereof. The filter includes: the first filtering branch consists of eleven filtering cavities which are coupled in sequence; the second filtering branch consists of nine filtering cavities which are coupled in sequence; the third filtering branch consists of eleven filtering cavities which are coupled in sequence; the fourth filtering branch consists of nine filtering cavities which are coupled in sequence; the fifth filtering branch consists of eleven filtering cavities which are coupled in sequence; the sixth filtering branch consists of nine filtering cavities which are coupled in sequence; the seventh filtering branch consists of eleven filtering cavities which are coupled in sequence; the eighth filtering branch consists of nine filtering cavities which are coupled in sequence; the bandwidths of the first filtering branch, the third filtering branch, the fifth filtering branch and the seventh filtering branch are all located at 1804Mhz-1881Mhz, and the bandwidths of the second filtering branch, the fourth filtering branch, the sixth filtering branch and the eighth filtering branch are all located at 1709Mhz-1786 Mhz; through the mode, the filter comprises the filtering branches with different bandwidths, and the isolation between the filtering branches is high.

Description

Communication device and filter thereof

Technical Field

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

Background

In a mobile communication device, a desired signal is modulated to form a modulated signal, the modulated signal is carried on a high-frequency carrier signal, the modulated signal is transmitted to the air through a transmitting antenna, the signal in the air is received through a receiving antenna, and the signal received by the receiving antenna does not include the desired signal but also includes harmonics and noise signals of other frequencies. The signal received by the receiving antenna needs to be filtered by a filter to remove unnecessary harmonic and noise signals. Therefore, the designed filter must precisely control its bandwidth.

The inventor of the present application finds, in long-term research and development work, that two or more groups of filtering branches with different frequencies are generally combined into a filter in order to reduce the size of the filter, but the performance such as out-of-band rejection between different filtering branches of the existing filter is poor, and it is difficult to achieve high isolation between signals.

Disclosure of Invention

The application provides a filter to solve the technical problems of poor out-of-band rejection performance and low isolation between filter branches of the filter in the prior art.

To solve the above problem, an embodiment of the present application provides a filter, where the filter includes:

the filter comprises a first filtering branch, a second filtering branch, a third filtering branch, a fourth filtering branch, a fifth filtering branch, a sixth filtering branch, a seventh filtering branch and an eighth filtering branch;

the first filtering branch circuit consists of eleven filtering cavities which are coupled in sequence; the second filtering branch consists of nine filtering cavities which are coupled in sequence; the third filtering branch consists of eleven filtering cavities which are coupled in sequence; the fourth filtering branch consists of nine filtering cavities which are coupled in sequence;

the fifth filtering branch consists of eleven filtering cavities which are coupled in sequence; the sixth filtering branch consists of nine filtering cavities which are coupled in sequence; the seventh filtering branch consists of eleven filtering cavities which are coupled in sequence; the eighth filtering branch consists of nine filtering cavities which are coupled in sequence;

the bandwidths of the first filtering branch circuit, the third filtering branch circuit, the fifth filtering branch circuit and the seventh filtering branch circuit are all located at 1804Mhz-1881Mhz, and the bandwidths of the second filtering branch circuit, the fourth filtering branch circuit, the sixth filtering branch circuit and the eighth filtering branch circuit are all located at 1709Mhz-1786 Mhz.

By the mode, the filter comprises the filtering branches with different bandwidths, and the isolation between the filtering branches is high.

Wherein the filter further comprises: a first common cavity, a second common cavity, a third common cavity and a fourth common cavity;

a first filter cavity of the first filter branch and a first filter cavity of the second filter branch are respectively coupled with the first common cavity;

the first filter cavity of the third filter branch and the first filter cavity of the fourth filter branch are respectively coupled with the second common cavity;

the first filter cavity of the fifth filter branch and the first filter cavity of the sixth filter branch are respectively coupled with the third common cavity;

and the first filter cavity of the seventh filter branch and the first filter cavity of the eighth filter branch are respectively coupled with the fourth common cavity.

Through the mode, the number of taps can be reduced through the arrangement of the common cavity, the required welding points are reduced, and the size of the filter is reduced.

The first filtering branch, the third filtering branch, the fifth filtering branch and the seventh filtering branch respectively comprise four capacitive cross-coupling zeros;

the second filtering branch, the fourth filtering branch, the sixth filtering branch and the eighth filtering branch respectively include three inductive cross-coupling zeros.

Through the mode, zero point inhibition can be realized through the pure inductive cross coupling and the pure capacitive cross coupling, the material types are reduced, the product complexity is reduced, and the material consistency is improved.

The first filter branch circuit comprises a first filter cavity, a second filter cavity, a third filter cavity, a sixth filter cavity, an eighth filter cavity and a tenth filter cavity, wherein the first filter cavity and the fifth filter cavity, the third filter cavity and the sixth filter cavity, the sixth filter cavity and the eighth filter cavity, and the eighth filter cavity and the tenth filter cavity are respectively in capacitive cross coupling;

inductive cross coupling is respectively performed between a second filtering cavity and a fourth filtering cavity of the second filtering branch, between the fourth filtering cavity and a sixth filtering cavity, and between the sixth filtering cavity and an eighth filtering cavity;

capacitive cross coupling is respectively performed between a third filtering cavity and a fifth filtering cavity, between the third filtering cavity and a sixth filtering cavity, between the sixth filtering cavity and an eighth filtering cavity and between the eighth filtering cavity and a tenth filtering cavity of the third filtering branch circuit;

inductive cross coupling is respectively performed between a first filtering cavity and a third filtering cavity, between a fourth filtering cavity and a sixth filtering cavity and between a seventh filtering cavity and a ninth filtering cavity of the fourth filtering branch circuit;

capacitive cross coupling is respectively performed between a third filtering cavity and a sixth filtering cavity, between a fourth filtering cavity and the sixth filtering cavity, between the sixth filtering cavity and an eighth filtering cavity and between the eighth filtering cavity and a tenth filtering cavity of the fifth filtering branch circuit;

inductive cross coupling is respectively performed between a first filtering cavity and a third filtering cavity, between a fourth filtering cavity and a sixth filtering cavity, and between a seventh filtering cavity and a ninth filtering cavity of the sixth filtering branch;

capacitive cross coupling is respectively performed between a third filtering cavity and a fifth filtering cavity, between the third filtering cavity and a sixth filtering cavity, between the sixth filtering cavity and an eighth filtering cavity and between the eighth filtering cavity and a tenth filtering cavity of the seventh filtering branch circuit;

and the first filtering cavity and the third filtering cavity, the fourth filtering cavity and the sixth filtering cavity, and the seventh filtering cavity and the ninth filtering cavity of the sixth filtering branch are in inductive cross coupling respectively.

Wherein the filter has a housing with a first direction and a second direction perpendicular to each other,

the first filtering branch and the second filtering branch are in a first row along the second direction L, and the third filtering branch and the fourth filtering branch are in a second row along the second direction L;

the fifth filtering branch and the sixth filtering branch are in a third column along the second direction L; the seventh filtering branch and the eighth filtering branch are in a fourth column along the second direction L.

Through the mode, the first filtering branch circuit to the eighth filtering branch circuit are regularly arranged, and the size of the filter is reduced.

The first filtering branch, the third filtering branch, the fifth filtering branch and the seventh filtering branch are respectively sending filtering branches;

the second filtering branch, the fourth filtering branch, the sixth filtering branch and the eighth filtering branch are receiving filtering branches respectively.

By the mode, the isolation degree of the receiving signal and the transmitting signal in the filter is improved.

The first filtering branch, the third filtering branch, the fifth filtering branch and the seventh filtering branch are respectively provided with a fly rod to form the four capacitive cross-coupling zero points;

the second filtering branch, the fourth filtering branch, the sixth filtering branch and the eighth filtering branch are respectively provided with metal coupling ribs to form the three inductive cross-coupling zeros.

By the mode, the inductive cross coupling is realized by the metal coupling ribs, the metal coupling ribs are slightly changed by the external temperature, and the filter is prevented from generating temperature drift.

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

the fourth filtering cavity, the fifth filtering cavity, the eighth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row and are sequentially arranged along the first direction;

the first filtering cavity, the second filtering cavity and the fourth filtering cavity of the first filtering branch circuit are arranged in a triangular mode, the projection of the center of the second filtering cavity in the first direction is located between the projection of the center of the first filtering cavity and the projection of the center of the fourth filtering cavity in the first direction, and the projection of the center of the first filtering cavity in the second direction is located between the projection of the center of the second filtering cavity and the projection of the center of the fourth filtering cavity in the second direction;

the ninth filtering cavity to the eleventh filtering cavity of the first filtering branch are arranged in a triangular shape, the projection of the center of the tenth filtering cavity in the first direction is located between the center of the ninth filtering cavity and the projection of the center of the eleventh filtering cavity in the first direction, and the projection of the center of the eleventh filtering cavity in the second direction is located between the center of the ninth filtering cavity and the projection of the center of the tenth filtering cavity in the second direction;

a first filtering cavity of the first filtering branch is respectively adjacent to a second filtering cavity, a fourth filtering cavity and the first common cavity;

a fifth filtering cavity of the first filtering branch is respectively adjacent to a third filtering cavity, a fourth filtering cavity, a sixth filtering cavity and an eighth filtering cavity;

the tenth filtering cavity of the first filtering branch is respectively adjacent to the seventh filtering cavity, the eighth filtering cavity, the ninth filtering cavity and the eleventh filtering cavity;

and the tenth filtering cavity and the eleventh filtering cavity of the first filtering branch are arranged in an intersecting manner, and the first filtering cavity and the first common cavity are arranged in an intersecting manner.

Through the mode, the first filtering branches are regularly arranged, and the size of the filter is reduced.

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

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

the first filtering cavity of the second filtering branch is respectively adjacent to the second filtering cavity, the fourth filtering cavity, the fifth filtering cavity and the first common cavity;

a third filter cavity of the second filter branch is respectively adjacent to the second filter cavity and the fourth filter cavity;

a sixth filtering cavity of the second filtering branch is respectively adjacent to a fourth filtering cavity, a fifth filtering cavity, a seventh filtering cavity and an eighth filtering cavity;

and the eighth filtering cavity of the second filtering branch is respectively intersected with the seventh filtering cavity and the ninth filtering cavity.

Through the mode, the second filtering branches are regularly arranged, and the size of the filter is reduced.

In order to solve the above problem, an embodiment of the present application provides a communication device, where the communication device includes an antenna and a radio frequency unit connected to the antenna, and the radio frequency unit includes the filter as described above and is configured to filter a radio frequency signal.

Compared with the prior art, the filter of this application includes: the filter comprises a first filtering branch, a second filtering branch, a third filtering branch, a fourth filtering branch, a fifth filtering branch, a sixth filtering branch, a seventh filtering branch and an eighth filtering branch; the first filtering branch consists of eleven filtering cavities which are coupled in sequence; the second filtering branch consists of nine filtering cavities which are coupled in sequence; the third filtering branch consists of eleven filtering cavities which are coupled in sequence; the fourth filtering branch consists of nine filtering cavities which are coupled in sequence; the fifth filtering branch consists of eleven filtering cavities which are coupled in sequence; the sixth filtering branch consists of nine filtering cavities which are coupled in sequence; the seventh filtering branch consists of eleven filtering cavities which are coupled in sequence; the eighth filtering branch consists of nine filtering cavities which are coupled in sequence; the bandwidths of the first filtering branch, the third filtering branch, the fifth filtering branch and the seventh filtering branch are all located at 1804Mhz-1881Mhz, and the bandwidths of the second filtering branch, the fourth filtering branch, the sixth filtering branch and the eighth filtering branch are all located at 1709Mhz-1786 Mhz; through the mode, the filter comprises the filtering branches with different bandwidths, and the isolation between the filtering branches is high.

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 provided herein;

fig. 2 is a schematic diagram of a topology of a first filtering branch provided in the present application;

fig. 3 is a schematic diagram of a topology of a second filtering branch provided in the present application;

FIG. 4 is a schematic diagram of another embodiment of a filter provided herein;

FIG. 5 is a schematic diagram of a filter according to another embodiment of the present application;

FIG. 6 is a diagram illustrating a first simulation result of the filter provided herein;

FIG. 7 is a diagram illustrating a second simulation result of the filter provided herein;

fig. 8 is a schematic structural diagram of an embodiment of a communication device provided in the present application.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or system that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or system.

The present application provides a filter, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application. The filter 10 of the present embodiment includes a housing 11, a first common cavity 12, a first filtering branch 13, and a second filtering branch 14; the first filtering branch 13 and the second filtering branch 14 may be a receiving filtering branch and a transmitting filtering branch, respectively, or may be both a receiving filtering branch and a transmitting filtering branch. In this embodiment, the first filtering branch 13 is a transmitting filtering branch, and the second filtering branch 14 is a receiving filtering branch. The housing 11 has a first direction L and a second direction D, and the first direction L of the housing 11 is perpendicular to the second direction D of the housing 11.

The first common cavity 12 is arranged so that the first filtering branch 13 and the second filtering branch 14 share one tap, which can reduce the number of taps of the filter 10 and reduce the size of the filter 10.

The first filtering branch 13 is coupled to the first common cavity 12 and is composed of eleven filtering cavities coupled in sequence, and the eleven filtering cavities of the first filtering branch 13 further form four capacitive cross-coupling zeros 131.

And the second filtering branch 14 is coupled with the first common cavity 12 and is composed of nine filtering cavities coupled in sequence, and the nine filtering cavities of the second filtering branch 14 further form three inductive cross-coupling zeros 141.

Further, eleven filter cavities of the first filter branch 13 have the same size, nine filter cavities of the second filter branch 14 have the same size, and the size of the filter cavity of the first filter branch 13 is larger than that of the filter cavity of the second filter branch 14, so that the filter cavities in the filter 10 are conveniently arranged.

The second filtering cavity a2, the third filtering cavity A3, the sixth filtering cavity a6 and the seventh filtering cavity a7 of the first filtering branch 13 are in a row and are sequentially arranged along the first direction L; the fourth filtering cavity a4, the fifth filtering cavity a5, the eighth filtering cavity A8 and the tenth filtering cavity a10 of the first filtering branch 13 are in a row and are sequentially arranged along the first direction L; the first filter cavity A1, the second filter cavity A2 and the fourth filter cavity A4 of the first filter branch 13 are arranged in a triangle, the projection of the center of the second filter cavity A2 in the first direction L is positioned between the center of the first filter cavity A1 and the projection of the center of the fourth filter cavity A4 in the first direction L, and the projection of the center of the first filter cavity A1 in the second direction D is positioned between the center of the second filter cavity A2 and the projection of the center of the fourth filter cavity A4 in the second direction D; the ninth filter cavity a9 to the eleventh filter cavity a11 of the first filter branch 13 are arranged in a triangle, the projection of the center of the tenth filter cavity a10 in the first direction L is located between the center of the ninth filter cavity a9 and the projection of the center of the eleventh filter cavity a11 in the first direction L, and the projection of the center of the eleventh filter cavity a11 in the second direction D is located between the center of the ninth filter cavity a9 and the projection of the center of the tenth filter cavity a10 in the second direction D.

Further, the first filter cavity a1 of the first filter branch 13 is respectively disposed adjacent to the second filter cavity a2, the fourth filter cavity a4 and the first common cavity 12; the fifth filtering cavity a5 of the first filtering branch 13 is respectively adjacent to the third filtering cavity A3, the fourth filtering cavity a4, the sixth filtering cavity a6 and the eighth filtering cavity a 7; the tenth filtering cavity a10 of the first filtering branch 13 is respectively adjacent to the seventh filtering cavity a7, the eighth filtering cavity A8, the ninth filtering cavity a9 and the eleventh filtering cavity a 11; the tenth filter cavity a10 of the first filter branch 13 intersects the eleventh filter cavity a11 and the first filter cavity a1 intersects the first common cavity 12.

Eleven filter cavities of the first filter branch 13 are regularly arranged, so that the space in the shell 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, eleven filter cavities of the first filter branch 13 have the same size, so that the first filter cavity a1 to the eleventh filter cavity a11 of the first filter branch 13 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have equal distances and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

Optionally, referring to fig. 1, the tenth filter cavity a10 of the first filter branch 13 intersects with the cavity circle of the eleventh filter cavity a11 to form a cavity circle intersection region, the cavity circle intersection region has two end points, a window is disposed in the cavity circle intersection region, so that the tenth filter cavity a10 and the eleventh filter cavity a11 form window coupling, and the width of the window is equal to the length of the connection line of the two end points. The cavity circles of the two filtering cavities are intersected, and the window is arranged in the intersected area of the cavity circles, so that the distance between the centers of the two filtering cavities can be reduced, the coupling is enhanced, the situation that a separation wall needs to be arranged between the two filtering cavities which are sequentially coupled in the traditional filtering cavity is avoided, then the coupling window is arranged on the separation wall, the materials are reduced, and the processing is convenient. The first filter cavity a1 intersects the first common cavity 12, and the two filter cavities in the intersecting arrangement described below have the same effect, and will not be described in detail herein.

The eighth filter cavity B8, the fifth filter cavity B5 and the first filter cavity B1 of the second filter branch 14 are in a row and are sequentially arranged along the first direction L; the seventh filtering cavity B7, the sixth filtering cavity B6, the fourth filtering cavity B4 and the second filtering cavity B2 of the second filtering branch 14 are in a row and are sequentially arranged along the first direction L; the first filter cavity B1 of the second filter branch 14 is respectively adjacent to the second filter cavity B2, the fourth filter cavity B4, the fifth filter cavity B5 and the first common cavity 12; the third filter cavity B3 of the second filter branch 14 is respectively arranged adjacent to the second filter cavity B2 and the fourth filter cavity B4; the sixth filtering cavity B2 of the second filtering branch 14 is respectively adjacent to the fourth filtering cavity B4, the fifth filtering cavity B5, the seventh filtering cavity B7 and the eighth filtering cavity B8; the eighth filter chamber B8 of the second filter branch 14 intersects the seventh filter chamber B7 and the ninth filter chamber B9, respectively.

The nine filter cavities of the second filter branch 14 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, nine filter cavities of the second filter branch 14 have the same size, so that the first filter cavity B1 to the ninth filter cavity B9 of the second filter branch 14 in the housing 11 can be equidistantly distributed, and the centers of any two adjacent filter cavities have the same distance, and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

Further, as shown in fig. 2, the first filter branch 13 is capacitively cross-coupled between the third filter cavity A3 and the fifth filter cavity a5, between the third filter cavity A3 and the sixth filter cavity a6, between the sixth filter cavity a6 and the eighth filter cavity A8, and between the eighth filter cavity A8 and the tenth filter cavity a10, respectively, so as to form four capacitive cross-coupling zeros 131 of the first filter branch 13, such as capacitors C1, C2, C3, and C4 shown in fig. 2, respectively. The zero point suppression can be realized by the arrangement of the capacitive cross coupling zero point 131 of the first filtering branch 13, so that the debugging index is convenient, the design requirement is met, the material types of the filter 10 are reduced by the arrangement of the pure capacitive cross coupling zero point 131, the product complexity can be reduced, the material consistency is good, and the product stability is high.

Specifically, a window may be disposed between the third filtering cavity A3 and the fifth filtering cavity a5 of the first filtering branch 13, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the third filtering cavity A3 and the fifth filtering cavity a5, and a capacitor C1 is formed. A window may be disposed between the third filter cavity A3 and the sixth filter cavity a6 of the first filter branch 13, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the third filter cavity A3 and the sixth filter cavity a6, and a capacitor C2 is formed. A window may be disposed between the sixth filtering cavity a6 and the eighth filtering cavity A8 of the first filtering branch 13, and a capacitive flying rod is disposed at the window, so that capacitive cross coupling is achieved between the sixth filtering cavity a6 and the eighth filtering cavity A8, and a capacitor C3 is formed. A window may be disposed between the eighth filtering cavity A8 and the tenth filtering cavity a10 of the first filtering branch 13, and a capacitive flying bar is disposed at the window, so that capacitive cross coupling is achieved between the eighth filtering cavity A8 and the tenth filtering cavity a10, and a capacitor C4 is formed.

Further, as shown in fig. 3, the second filter cavity B2 and the fourth filter cavity B4, the fourth filter cavity B4 and the sixth filter cavity B6, and the sixth filter cavity B6 and the eighth filter cavity B8 of the second filter branch 14 are inductively cross-coupled to form three inductive cross-coupling zeros 141 of the second filter branch 14, such as inductances L1, L2, and L3 shown in fig. 3, respectively. The inductive cross-coupling zero point 141 of the second filtering branch 14 is set to achieve zero point suppression, so that debugging indexes are facilitated, and design requirements are met.

Specifically, a window may be disposed between the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is achieved between the second filter cavity B2 and the fourth filter cavity B4, and an inductance L1 is formed. A window may be disposed between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 14, and a metal coupling rib is disposed on the window, so that the fourth filter cavity B4 and the sixth filter cavity B6 realize inductive cross coupling, and an inductor L2 is formed. A window may be disposed between the sixth filtering cavity B6 and the eighth filtering cavity B8 of the second filtering branch 14, and a metal coupling rib is disposed on the window, so that the sixth filtering cavity B6 and the eighth filtering cavity B8 realize inductive cross coupling, and an inductor L3 is formed. 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 as to prevent the filter 10 from generating the temperature drift.

The coupling zero is also referred to as a transmission zero. The transmission zero is the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy cannot pass through the network at the frequency point corresponding to the transmission zero, so that the complete isolation effect is achieved, the inhibition effect on signals outside the band-pass is achieved, and the high isolation among a plurality of band-passes can be better achieved.

In this embodiment, the first common cavity 12 is arranged such that the first filtering branch 13 and the second filtering branch 14 share one tap, which can reduce the number of taps of the filter 10 and reduce the size of the filter 10; eleven filter cavities of the first filter branch circuit 13 have the same size, nine filter cavities of the second filter branch circuit 14 have the same size, and the size of the filter cavity of the first filter branch circuit 13 is larger than that of the filter cavity of the second filter branch circuit 14, so that the filter cavities in the filter 10 are conveniently arranged; the distance between the centers of the two filtering cavities can be reduced and the coupling is enhanced by intersecting the cavity circles of the two filtering cavities and arranging the window in the intersecting area of the cavity circles, so that a separating wall is not required to be arranged between the two filtering cavities which are sequentially coupled in the traditional filtering cavity, and then the coupling window is arranged on the separating wall, so that the material is reduced, and the processing is convenient; zero point suppression can be realized by the arrangement of the capacitive cross coupling zero point of the first filtering branch 13 and the arrangement of the inductive cross coupling zero point of the second filtering branch 14, so that the indexes are convenient to debug and the design requirements are met, and the arrangement of the pure capacitive cross coupling zero point and the pure inductive cross coupling zero point reduces the material types of the filter 10, thereby reducing the product complexity, ensuring good material consistency and high product stability; 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 as to prevent the filter 10 from generating the temperature drift.

The filter 10 of the present application further comprises a second common cavity 15, a third filter branch 16 and a fourth filter branch 17.

Wherein the second common chamber 15 is arranged on the housing 11.

And the third filtering branch 16 is coupled with the second common cavity 15 and is composed of eleven filtering cavities coupled in sequence, and the eleven filtering cavities of the third filtering branch 16 further form four capacitive cross-coupling zeros 161.

And a fourth filtering branch 17, coupled to the second common cavity 15, and composed of nine filtering cavities coupled in sequence, where the nine filtering cavities of the fourth filtering branch 17 further form three inductive cross-coupling zeros 171.

The third filtering branch 16 and the first filtering branch 13 are arranged along the second direction D, and the fourth filtering branch 17 and the second filtering branch 14 are arranged along the second direction D.

In this embodiment, the first filtering branch 13 and the third filtering branch 16 are transmitting filtering branches, and the second filtering branch 14 and the fourth filtering branch 17 are receiving filtering branches.

It should be noted that the capacitive cross-coupling zero 161 of the third filtering branch 16 is the same as the inductive cross-coupling zero 131 of the first filtering branch 13, and is not described herein again.

Wherein the eleven filter cavities of the third filter branch 16 are divided into three columns arranged along the second direction D; the fourth filtering cavity C4, the fifth filtering cavity C5 and the seventh filtering cavity C7 of the third filtering branch 16 are in a row and are sequentially arranged along the first direction L; the third filter cavity C3, the sixth filter cavity C6 and the eighth filter cavity C8 of the third filter branch 16 are in a row and are sequentially arranged along the first direction L; the first filtering cavity C1, the second filtering cavity C2, the ninth filtering cavity C9, the tenth filtering cavity C10 and the eleventh filtering cavity C11 of the third filtering branch 16 are in a row and are sequentially arranged along the first direction L;

further, the third filtering cavity C3 of the third filtering branch 16 is respectively disposed adjacent to the first filtering cavity C1, the second filtering cavity C2, the fourth filtering cavity C4, the fifth filtering cavity C5 and the sixth filtering cavity C6; the ninth filtering cavity C9 of the third filtering branch 16 is respectively adjacent to the second filtering cavity C2, the sixth filtering cavity C6, the eighth filtering cavity C8 and the tenth filtering cavity C10; the seventh filtering cavity C7 of the third filtering branch 16 is respectively adjacent to the fifth filtering cavity C5, the sixth filtering cavity C6, the eighth filtering cavity C8, the fifth filtering cavity a5 of the first filtering branch 13, the eighth filtering cavity A8 and the ninth filtering cavity a 9.

Eleven filter cavities of the third filter branch 16 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, the eleven filter cavities of the third filter branch 16 have the same size, so that the first filter cavity C1 to the eleventh filter cavity C11 of the third filter branch 16 in the housing 11 may be distributed at equal intervals, and the centers of any two adjacent filter cavities have equal distances and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

The fourth filtering cavity D4 and the third filtering cavity D3 of the fourth filtering branch 17 are in a row and are sequentially arranged along the first direction L; the eighth filtering cavity D8 and the ninth filtering cavity D9 of the fourth filtering branch 17 are in a row and are sequentially arranged along the first direction L; the first filter cavity D1 to the third filter cavity D3 of the fourth filter branch 17 are arranged in a triangle, the projection of the center of the second filter cavity D2 in the first direction L is positioned between the center of the first filter cavity D1 and the projection of the center of the third filter cavity D3 in the first direction L, and the projection of the center of the third filter cavity D3 in the second direction D is positioned between the center of the first filter cavity D1 and the projection of the center of the second filter cavity D2 in the second direction D; the fourth filter cavity D4 to the sixth filter cavity D6 of the fourth filter branch 17 are arranged in a triangle, the projection of the center of the fourth filter cavity D4 in the first direction L is located between the center of the fifth filter cavity D5 and the projection of the center of the sixth filter cavity D6 in the first direction L, and the projection of the center of the sixth filter cavity D6 in the second direction D is located between the center of the fifth filter cavity D5 and the projection of the center of the fourth filter cavity D4 in the second direction D; the sixth filtering cavity D6 to the eighth filtering cavity D8 of the fourth filtering branch 17 are arranged in a triangle, the projection of the center of the seventh filtering cavity D7 in the first direction L is located between the center of the sixth filtering cavity D6 and the projection of the center of the eighth filtering cavity D8 in the first direction L, and the projection of the center of the seventh filtering cavity D7 in the second direction D is located between the center of the sixth filtering cavity D6 and the projection of the center of the eighth filtering cavity D8 in the second direction D.

Further, the first filter cavity D1 of the fourth filter branch 17 is respectively disposed adjacent to the second filter cavity D2, the third filter cavity D3 and the second common cavity 15; the fourth filtering cavity D4 of the fourth filtering branch 17 is respectively adjacent to the third filtering cavity D3, the fifth filtering cavity D5, the sixth filtering cavity D6 and the ninth filtering cavity D9; the ninth filtering cavity D9 of the fourth filtering branch 17 is respectively adjacent to the fourth filtering cavity D4, the seventh filtering cavity D7 and the eighth filtering cavity D8; the eighth filter cavity D8 of the fourth filter branch 17 intersects with the seventh filter cavity D7 and the ninth filter cavity D9, respectively; the second common cavity 15 intersects with the first filter cavity C1 of the third filter branch 16 and the first filter cavity D1 of the fourth filter branch 17.

The nine filter cavities of the fourth filter branch 17 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, nine filter cavities of the fourth filter branch 17 have the same size, so that the first filter cavity D1 to the ninth filter cavity D9 of the fourth filter branch 17 in the housing 11 can be distributed at equal intervals, and the distance between the centers of any two adjacent filter cavities is equal, so that the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved.

As shown in fig. 4, the first filter cavity D1 and the third filter cavity D3, the fourth filter cavity D4 and the sixth filter cavity D6, and the seventh filter cavity D7 and the ninth filter cavity D9 of the fourth filter branch 17 are inductively cross-coupled to form three inductive cross-coupling zeros 171 of the fourth filter branch 17, which are respectively inductors L1, L2, and L3 shown in fig. 4. The inductive cross-coupling zero 171 of the fourth filtering branch 17 can realize zero suppression, so that the debugging index is convenient, the design requirement is met, the material types of the filter 10 are reduced due to the arrangement of the inductive cross-coupling zero 171, the product complexity can be reduced, the material consistency is good, and the product stability is high.

Specifically, a window may be disposed between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 17, and a metal coupling rib is disposed on the window, so that the inductive cross coupling is implemented between the first filter cavity D1 and the third filter cavity D3, and an inductance L1 is formed. A window may be disposed between the fourth filter cavity D4 and the sixth filter cavity D6 of the fourth filter branch 17, and a metal coupling rib is disposed at the window, so that inductive cross coupling is achieved between the fourth filter cavity D4 and the sixth filter cavity D6, and an inductor L2 is formed. A window may be disposed between the seventh filter cavity D7 and the ninth filter cavity D9 of the fourth filter branch 17, and a metal coupling rib is disposed on the window, so that inductive cross coupling is achieved between the seventh filter cavity D7 and the ninth filter cavity D9, and an inductance L3 is formed. 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 as to prevent the filter 10 from generating the temperature drift.

The filter 10 of the present application further includes a third common cavity 111, a fifth filtering branch 112, a sixth filtering branch 113, a fourth common cavity 114, a seventh filtering branch 115, and an eighth filtering branch 116.

Wherein the third common chamber 111 and the fourth common chamber 114 are provided on the housing.

And a fifth filtering branch 112, coupled to the third common cavity 111, and composed of eleven filtering cavities coupled in sequence, where the eleven filtering cavities of the fifth filtering branch 112 further form four capacitive cross-coupling zeros 1121.

The sixth filtering branch 113 is coupled to the third common cavity 111, and is composed of nine filtering cavities coupled in sequence, and the nine filtering cavities of the sixth filtering branch 113 further form three inductive cross-coupling zeros 1131.

The seventh filtering branch 115 is coupled with the fourth common cavity 114 and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the seventh filtering branch 115 further form four capacitive cross-coupling zeros 1151; the seventh filtering branch 115 and the first filtering branch 13 are symmetrically arranged along the second direction D.

And an eighth filtering branch 116, coupled to the fourth common cavity 114, and composed of nine filtering cavities coupled in sequence, where the nine filtering cavities of the eighth filtering branch 116 further form three inductive cross-coupling zeros 1161.

The seventh filtering branch 115, the fifth filtering branch 112, the third filtering branch 16 and the first filtering branch 13 are arranged along the second direction D, and the eighth filtering branch 116, the sixth filtering branch 113, the fourth filtering branch 17 and the second filtering branch 14 are arranged along the second direction D. In this embodiment, the first filtering branch 13, the third filtering branch 16, the fifth filtering branch 112, and the seventh filtering branch 115 are transmitting filtering branches, and the second filtering branch 14, the fourth filtering branch 17, the sixth filtering branch 113, and the eighth filtering branch 116 are receiving filtering branches.

It should be noted that the first filter cavity G1 through the eleventh filter cavity G11 of the seventh filter branch 115 are the same as the first filter cavity a1 through the eleventh filter cavity a11 of the first filter branch 13; the capacitive cross-coupling zero 1151 of the seventh filtering branch 115 is the same as the capacitive cross-coupling zero 131 of the first filtering branch 13, and the inductive cross-coupling zero 1131 of the sixth filtering branch 113, the inductive cross-coupling zero 1161 of the eighth filtering branch 116 are also the same as the inductive cross-coupling zero 171 of the fourth filtering branch 17; and will not be described in detail herein.

The fourth filter cavity E4, the fifth filter cavity E5 and the ninth filter cavity E9 of the fifth filter branch 112 are in a row and are sequentially arranged along the first direction L; the third filter cavity E3, the sixth filter cavity E6, the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 112 are in a row and are sequentially arranged along the first direction L; the first filter cavity E1, the second filter cavity E2 and the seventh filter cavity E7 of the fifth filter branch 112 are in a row and are sequentially arranged along the first direction L.

Further, the third filter cavity E3 of the fifth filter branch 112 is respectively disposed adjacent to the first filter cavity E1, the second filter cavity E2, the fourth filter cavity E4 and the sixth filter cavity E6; the eighth filtering cavity E8 of the fifth filtering branch 112 is respectively adjacent to the fifth filtering cavity E5, the sixth filtering cavity E6, the seventh filtering cavity E7, the ninth filtering cavity E9 and the tenth filtering cavity E10; the first filter cavity E1 of the fifth filter branch 112 intersects the third common cavity 111, and the tenth filter cavity E10 and the eleventh filter cavity E11 of the fifth filter branch 112 intersect.

Eleven filter cavities of the fifth filter branch 112 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, the eleven filter cavities of the fifth filter branch 112 have the same size, so that the first filter cavity E1 to the eleventh filter cavity E11 of the fifth filter branch 112 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have equal distances and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

As shown in fig. 5, the capacitances are respectively cross-coupled between the third filter cavity E3 and the sixth filter cavity E6, between the fourth filter cavity E4 and the sixth filter cavity E6, between the sixth filter cavity E6 and the eighth filter cavity E8, and between the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 112, so as to form four capacitive cross-coupling zeros 1121 of the fifth filter branch 112, which are respectively shown as the capacitances C1, C2, C3, and C4 in fig. 5. The arrangement of the capacitive cross coupling zero point 1121 of the fifth filtering branch 112 can realize zero point suppression, so as to facilitate debugging indexes and meet design requirements, and the arrangement of the pure capacitive cross coupling zero point 1121 reduces the material types of the filter 10, thereby reducing the product complexity, achieving good material consistency and achieving high product stability.

Specifically, a window may be disposed between the third filter cavity E3 and the sixth filter cavity E6 of the fifth filter branch 112, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the third filter cavity E3 and the sixth filter cavity E6, and a capacitor C1 is formed. A window may be disposed between the fourth filter cavity E4 and the sixth filter cavity E6 of the fifth filter branch 112, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the fourth filter cavity E4 and the sixth filter cavity E6, and a capacitor C2 is formed. A window may be disposed between the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 112, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the sixth filter cavity E6 and the eighth filter cavity E8, and a capacitor C3 is formed. A window may be disposed between the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 112, and a capacitive fly rod may be disposed at the window, so that capacitive cross coupling is achieved between the eighth filter cavity E8 and the tenth filter cavity E10, and a capacitor C4 is formed.

The third filtering cavity F3 and the fourth filtering cavity F4 of the sixth filtering branch 113 are in a row and are sequentially arranged along the first direction L; the seventh filtering cavity F7 and the eighth filtering cavity F8 of the sixth filtering branch 113 are in a row and are sequentially arranged along the first direction L; the first filter cavity F1 to the third filter cavity F3 of the sixth filter branch 113 are arranged in a triangle, the projection of the center of the first filter cavity F1 in the first direction L is located between the center of the second filter cavity F2 and the projection of the center of the third filter cavity F3 in the first direction L, and the projection of the center of the second filter cavity F2 in the second direction D is located between the center of the first filter cavity F1 and the projection of the center of the third filter cavity F3 in the second direction D; the fourth filter cavity F4 to the sixth filter cavity F6 of the sixth filter branch 113 are arranged in a triangle, the projection of the center of the fifth filter cavity F5 in the first direction L is located between the center of the fourth filter cavity F4 and the projection of the center of the sixth filter cavity F6 in the first direction L, and the projection of the center of the fourth filter cavity F4 in the second direction D is located between the center of the fifth filter cavity F5 and the projection of the center of the sixth filter cavity F6 in the second direction D.

Further, the third filter cavity F3 of the sixth filter branch 113 is respectively disposed adjacent to the first filter cavity F1, the second filter cavity F2, the fourth filter cavity F4 and the fifth filter cavity F5; the seventh filtering cavity F7 of the sixth filtering branch 113 is respectively adjacent to the sixth filtering cavity F6, the eighth filtering cavity F8 and the ninth filtering cavity F9; the fifth filter cavity F5 of the sixth filter branch 113 intersects with the fourth filter cavity F4 and the sixth filter cavity F6, respectively; the seventh filter cavity F7 of the sixth filter branch 113 intersects with the sixth filter cavity F6 and the eighth filter cavity F7, respectively.

The nine filter cavities of the sixth filter branch 113 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, nine filter cavities of the sixth filter branch 113 have the same size, so that the first filter cavity F1 to the ninth filter cavity F9 of the sixth filter branch 113 in the housing 11 can be distributed at equal intervals, and the centers of any two adjacent filter cavities have equal distances and are arranged closely, thereby facilitating layout and debugging and improving the consistency of the filter 10.

The eighth filtering cavity H8 and the ninth filtering cavity H9 of the eighth filtering branch 116 are in a row and are sequentially arranged along the first direction L; the first filtering cavity H1 to the third filtering cavity H3 of the eighth filtering branch 116 are arranged in a triangle, the projection of the center of the first filtering cavity H1 in the first direction L is located between the center of the second filtering cavity H2 and the projection of the center of the third filtering cavity H3 in the first direction L, and the projection of the center of the third filtering cavity H3 in the second direction D is located between the center of the first filtering cavity H1 and the projection of the center of the second filtering cavity H2 in the second direction D; the fourth filter cavity H4 to the sixth filter cavity H6 of the eighth filter branch 116 are arranged in a triangle, the projection of the center of the fourth filter cavity H4 in the first direction L is located between the center of the fifth filter cavity H5 and the projection of the center of the sixth filter cavity H6 in the first direction L, and the projection of the center of the sixth filter cavity H6 in the second direction D is located between the center of the fifth filter cavity H5 and the projection of the center of the fourth filter cavity H4 in the second direction D.

Further, the third filter cavity H3 of the eighth filter branch 116 is respectively disposed adjacent to the first filter cavity H1, the second filter cavity H2 and the fourth filter cavity H4; the seventh filtering cavity H7 of the eighth filtering branch 116 is respectively adjacent to the fourth filtering cavity H4, the sixth filtering cavity H6, the eighth filtering cavity H8 and the ninth filtering cavity H9; the fourth common cavity 114 intersects with the first filter cavity G1 of the seventh filter branch 115 and the first filter cavity H1 of the eighth filter branch 116; the eighth filter cavity H8 of the eighth filter branch 116 is intersected with the seventh filter cavity H7 and the ninth filter cavity H9, respectively.

The nine filter cavities of the eighth filter branch 116 are regularly arranged, so that the space in the housing 11 can be saved, the size of the filter 10 can be reduced, and the stability of the filter 10 can be improved. Further, nine filter cavities of the eighth filter branch 116 have the same size, so that the first filter cavity H1 to the ninth filter cavity H9 of the eighth filter branch 116 in the housing 11 can be distributed at equal intervals, and the distances between the centers of any two adjacent filter cavities are equal, so that the arrangement is tight, the layout and debugging are facilitated, and the consistency of the filter 10 is improved.

Optionally, the housing 11 is further provided with a first port (not shown), a second port (not shown), a third port (not shown), a fourth port (not shown), a fifth port (not shown), a sixth port (not shown), a seventh port (not shown), an eighth port (not shown), a ninth port (not shown), a tenth port (not shown), an eleventh port (not shown), and a twelfth port (not shown).

The first common cavity 12 is connected to the first port, the eleventh filtering cavity a11 of the first filtering branch 13 is connected to the second port, and the ninth filtering cavity B9 of the second filtering branch 14 is connected to the third port; the second common cavity 15 is connected with the fourth port, the eleventh filtering cavity C11 of the third filtering branch 16 is connected with the fifth port, and the ninth filtering cavity D9 of the fourth filtering branch 17 is connected with the sixth port; the third common cavity 111 is connected with the seventh port, the eleventh filtering cavity E11 of the fifth filtering branch 112 is connected with the eighth port, and the ninth filtering cavity F9 of the sixth filtering branch 113 is connected with the ninth port; the fourth common cavity 114 is connected to the tenth port, the eleventh filtering cavity G11 of the seventh filtering branch 115 is connected to the eleventh port, and the ninth filtering cavity H9 of the eighth filtering branch 116 is connected to the twelfth port.

The first to twelfth ports may be taps of the filter 10.

The bandwidth of the first filtering branch 13 of this embodiment is in the range 1804Mhz-1881 Mhz. In particular, the coupling bandwidth between the first common cavity 12 and the first filter cavity a1 of the first filter branch 13 ranges from 69Mhz to 81 Mhz; the coupling bandwidth between the first filter cavity a1 and the second filter cavity a2 of the first filter branch 13 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the second filter cavity a2 and the third filter cavity A3 of the first filter branch 13 ranges from 39Mhz to 43 Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity a4 of the first filter branch 13 ranges from 26Mhz to 34 Mhz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 13 ranges from-29 Mhz to-22 Mhz; the coupling bandwidth between the third filter cavity A3 and the sixth filter cavity a6 of the first filter branch 13 ranges from 2Mhz to 7 Mhz; the coupling bandwidth between the fourth filter cavity a4 and the fifth filter cavity a5 of the first filter branch 13 ranges from 21Mhz to 28 Mhz; the coupling bandwidth between the fifth filter cavity a5 and the sixth filter cavity a6 of the first filter branch 13 ranges from 34Mhz to 42 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the seventh filter cavity a7 of the first filter branch 13 ranges from 30Mhz to 38 Mhz; the coupling bandwidth between the sixth filter cavity a6 and the eighth filter cavity A8 of the first filter branch 13 ranges from-22 Mhz to-16 Mhz; the coupling bandwidth between the seventh filter cavity a7 and the eighth filter cavity A8 of the first filter branch 13 ranges from 30Mhz to 38 Mhz; the coupling bandwidth between the eighth filter cavity A8 and the ninth filter cavity a9 of the first filter branch 13 ranges from 34Mhz to 42 Mhz; the coupling bandwidth between the eighth filter cavity A8 and the tenth filter cavity a10 of the first filter branch 13 ranges from 11Mhz to 17 Mhz; the coupling bandwidth between the ninth filter cavity a9 and the tenth filter cavity a10 of the first filter branch 13 ranges from 36Mhz to 45 Mhz; the coupling bandwidth between the tenth filter cavity a10 and the eleventh filter cavity a11 of the first filter branch 13 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the eleventh filter cavity a11 of the first filter branch 13 and the second port is in the range of 69Mhz-81 Mhz.

The bandwidth of the second filtering branch 14 of this embodiment is in the range of 1709Mhz-1786 Mhz. In particular, the coupling bandwidth between the first common cavity 12 and the first filter cavity B1 of the second filter branch 14 ranges from 70Mhz to 82 Mhz; the coupling bandwidth between the first filter cavity B1 and the second filter cavity B2 of the second filter branch 14 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the second filter cavity B2 and the third filter cavity B3 of the second filter branch 14 ranges from 36Mhz to 45 Mhz; the coupling bandwidth between the second filter cavity B2 and the fourth filter cavity B4 of the second filter branch 14 ranges from 14Mhz to 20 Mhz; the coupling bandwidth between the third filter cavity B3 and the fourth filter cavity B4 of the second filter branch 14 ranges from 33Mhz to 41 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the fifth filter cavity B5 of the second filter branch 14 ranges from 32Mhz to 40 Mhz; the coupling bandwidth between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 14 ranges from 14Mhz to 20 Mhz; the coupling bandwidth between the fifth filter cavity B5 and the sixth filter cavity B6 of the second filter branch 14 ranges from 32Mhz to 40 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the seventh filter cavity B7 of the second filter branch 14 ranges from 34Mhz to 43 Mhz; the coupling bandwidth between the sixth filter cavity B6 and the eighth filter cavity B8 of the second filter branch 14 ranges from 10Mhz to 16 Mhz; the coupling bandwidth between the seventh filter cavity B7 and the eighth filter cavity B8 of the second filter branch 14 ranges from 37Mhz to 46 Mhz; the coupling bandwidth between the eighth filter cavity B8 and the ninth filter cavity B9 of the second filter branch 14 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the ninth filter cavity B9 of the second filter branch 14 and the third port is in the range of 70Mhz-82 Mhz.

The bandwidth parameters of the third filtering branch 16 and the bandwidth parameters of the seventh filtering branch 115 are the same as the bandwidth parameters of the first filtering branch 13, and are not described herein again.

The bandwidth of the fourth filtering branch 17 of this embodiment is in the range of 1709Mhz-1786 Mhz. In particular, the coupling bandwidth between the second common cavity 15 and the first filtering cavity D1 of the fourth filtering branch 17 ranges from 70Mhz to 82 Mhz; the coupling bandwidth between the first filter cavity D1 and the second filter cavity D2 of the fourth filter branch 17 ranges from 52Mhz to 62 Mhz; the coupling bandwidth between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 17 ranges from 20Mhz to 27 Mhz; the coupling bandwidth between the second filter cavity D2 and the third filter cavity D3 of the fourth filter branch 17 ranges from 34Mhz to 43 Mhz; the coupling bandwidth between the third filter cavity D3 and the fourth filter cavity D4 of the fourth filter branch 17 ranges from 36Mhz to 45 Mhz; the coupling bandwidth between the fourth filter cavity D4 and the fifth filter cavity D5 of the fourth filter branch 17 ranges from 32Mhz to 40 Mhz; the coupling bandwidth between the fourth filter cavity D4 and the sixth filter cavity D6 of the fourth filter branch 17 ranges from 13Mhz to 19 Mhz; the coupling bandwidth between the fifth filter cavity D5 and the sixth filter cavity D6 of the fourth filter branch 17 ranges from 32Mhz to 40 Mhz; the coupling bandwidth between the sixth filter cavity D6 and the seventh filter cavity D7 of the fourth filter branch 17 ranges from 36Mhz to 45 Mhz; the coupling bandwidth between the seventh filter cavity D7 and the eighth filter cavity D8 of the fourth filter branch 17 ranges from 31Mhz to 39 Mhz; the coupling bandwidth between the seventh filter cavity D7 and the ninth filter cavity D9 of the fourth filter branch 17 ranges from 27Mhz to 35 Mhz; the coupling bandwidth between the eighth filter cavity D8 and the ninth filter cavity D9 of the fourth filter branch 17 ranges from 48Mhz to 58 Mhz; the coupling bandwidth between the ninth filter cavity D9 and the sixth port of the fourth filter branch 17 is in the range of 70Mhz-82 Mhz.

The bandwidth parameters of the sixth filtering branch 113 and the bandwidth parameters of the eighth filtering branch 116 are the same as the bandwidth parameters of the fourth filtering branch 17, and are not described herein again.

The bandwidth of the fifth filtering branch 112 of this embodiment is in the range of 1804Mhz-1881 Mhz. In particular, the coupling bandwidth between the third common cavity 111 and the first filter cavity E1 of the fifth filter branch 112 ranges from 69Mhz to 81 Mhz; the coupling bandwidth between the first filter cavity E1 and the second filter cavity E2 of the fifth filter branch 112 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the second filter cavity E2 and the third filter cavity E3 of the fifth filter branch 112 ranges from 39Mhz to 48 Mhz; the coupling bandwidth between the third filter cavity E3 and the fourth filter cavity E4 of the fifth filter branch 112 ranges from 35Mhz to 44 Mhz; the coupling bandwidth between the third filter cavity E3 and the sixth filter cavity E6 of the fifth filter branch 112 ranges from 1Mhz to 6 Mhz; the coupling bandwidth between the fourth filter cavity E4 and the fifth filter cavity E5 of the fifth filter branch 112 ranges from 25Mhz to 32 Mhz; the coupling bandwidth between the fourth filter cavity E4 and the sixth filter cavity E6 of the fifth filter branch 112 ranges from-26 Mhz to-19 Mhz; the coupling bandwidth between the fifth filter cavity E5 and the sixth filter cavity E6 of the fifth filter branch 112 ranges from 26Mhz to 34 Mhz; the coupling bandwidth between the sixth filter cavity E6 and the seventh filter cavity E7 of the fifth filter branch 112 ranges from 31Mhz to 39 Mhz; the coupling bandwidth between the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 112 ranges from-19 Mhz to-13 Mhz; the coupling bandwidth between the seventh filter cavity E7 and the eighth filter cavity E8 of the fifth filter branch 112 ranges from 32Mhz to 40 Mhz; the coupling bandwidth between the eighth filter cavity E8 and the ninth filter cavity E9 of the fifth filter branch 112 ranges from 33Mhz to 41 Mhz; the coupling bandwidth between the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 112 ranges from 12Mhz to 18 Mhz; the coupling bandwidth between the ninth filter cavity E9 and the tenth filter cavity E10 of the fifth filter branch 112 ranges from 36Mhz to 45 Mhz; the coupling bandwidth between the tenth filter cavity E10 and the eleventh filter cavity E11 of the fifth filter branch 112 ranges from 56Mhz to 67 Mhz; the coupling bandwidth between the eleventh filter cavity E11 and the eighth port of the fifth filter branch 112 is in the range of 69Mhz-81 Mhz.

Therefore, the resonant frequencies of the first filter cavity a1 through the eleventh filter cavity a11 of the first filter branch 13 are sequentially located in the following ranges: 1841Mhz-1843Mhz, 1814Mhz-1816Mhz, 1838Mhz-1840Mhz, 1841Mhz-1843Mhz, 1821Mhz-1823Mhz, 1840Mhz-1842Mhz, 1855Mhz-1857Mhz, 1841Mhz-1843 Mhz.

It can be seen that the resonant frequencies of the eleven filter cavities of the first filter branch 13 are substantially the same, wherein the first resonant frequency, the second resonant frequency, the third resonant frequency, the sixth resonant frequency, the tenth resonant frequency and the eleventh resonant frequency are completely the same, which improves the convenience of manufacturing and debugging the filter 10, that is, the same specification parameters can be adopted for manufacturing in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

The resonant frequencies of the first filter cavity B1 through the ninth filter cavity B9 of the second filter branch 14 are sequentially in the following ranges: 1745Mhz-1747Mhz, 1762Mhz-1764Mhz, 1743Mhz-1745Mhz, 1762Mhz-1764Mhz, 1744Mhz-1746Mhz, 1758Mhz-1760Mhz, 1745Mhz-1747 Mhz.

It can be seen that the resonant frequencies of the nine filter cavities of the second filter branch 14 are substantially the same, wherein the first resonant frequency, the second resonant frequency, the eighth resonant frequency and the ninth resonant frequency are completely the same, which improves the convenience of manufacturing and debugging the filter 10, that is, the same specification parameters can be adopted for manufacturing in the manufacturing process, and the required parameter range can be reached only by simple debugging in the actual process.

The frequency parameters of the third filtering branch 16 and the frequency parameters of the seventh filtering branch 115 are the same as the frequency parameters of the first filtering branch 13, and are not described herein again.

The resonant frequencies of the first filter cavity D1 through the ninth filter cavity D9 of the fourth filter branch 17 are sequentially in the following ranges: 1745Mhz-1747Mhz, 1763Mhz-1765Mhz, 1743Mhz-1745Mhz, 1744Mhz-1746Mhz, 1761Mhz-1763Mhz, 1744Mhz-1746Mhz, 1742Mhz-1744Mhz, 1768Mhz-1770Mhz, 1745Mhz-1747 Mhz.

The frequency parameters of the sixth filtering branch 113 and the eighth filtering branch 116 are the same as the frequency parameters of the fourth filtering branch 17, and are not described herein again.

The resonant frequencies of the first filter cavity E1 through the eleventh filter cavity E11 of the fifth filter branch 112 are sequentially in the following ranges: 1841Mhz-1843Mhz, 1838Mhz-1840Mhz, 1817Mhz-1819Mhz, 1841Mhz-1843Mhz, 1824Mhz-1826Mhz, 1840Mhz-1842Mhz, 1856Mhz-1858Mhz, 1841Mhz-1843 Mhz.

As shown in fig. 6, fig. 6 is a schematic diagram of a first simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the first filtering branch 13, the third filtering branch 16, the fifth filtering branch 112 and the seventh filtering branch 115 of the present application are in the range of 1804Mhz-1881Mhz, as shown by the frequency band curve 21 in fig. 6.

Wherein the band curve 21 has a bandwidth rejection of greater than 35dB in a frequency range from 0.009Mhz-380.2Mhz, a bandwidth rejection of greater than 90dB in a frequency range from 380.2Mhz-1427Mhz, a bandwidth rejection of greater than 55dB in a frequency range from 1427Mhz-1525Mhz, a bandwidth rejection of greater than 35dB in a frequency range from 1525Mhz-1559Mhz, a bandwidth rejection of greater than 35dB in a frequency range from 1559Mhz-1610Mhz, a bandwidth rejection of greater than 93dB in a frequency range from 1610Mhz-1710Mhz, a bandwidth rejection of greater than 35dB in a frequency range from 1710 Mhz-1710Mhz, a bandwidth rejection of greater than 107dB in a frequency range from 1785Mhz-1795Mhz, a bandwidth rejection of greater than 21dB in a frequency range from 171800 Mhz-171800 Mhz, a bandwidth rejection of greater than 1111Hz, a bandwidth rejection of 890 in a frequency range from 1795 Mhz-1Mhz, a bandwidth rejection of more than 21dB, a bandwidth rejection of more than 48dB in a frequency range from 1900Mhz to 1910Mhz, a bandwidth rejection of more than 51dB in a frequency range from 1920Mhz to 1980Mhz, a bandwidth rejection of more than 88dB in a frequency range from 1980Mhz to 2025Mhz, a bandwidth rejection of more than 90dB in a frequency range from 2025Mhz to 2200Mhz, a bandwidth rejection of more than 54dB in a frequency range from 2200Mhz to 2300Mhz, a bandwidth rejection of more than 93dB in a frequency range from 2300Mhz to 2900Mhz, a bandwidth rejection of more than 90dB in a frequency range from 2900Mhz to 3400Mhz, a bandwidth rejection of more than 50dB in a frequency range from 2900Mhz to 3610Mhz, a bandwidth rejection of more than 67dB in a frequency range from 3400Mhz to 3610Mhz, a bandwidth rejection of more than 3760 dB in a frequency range from 2900Mhz to 370 Mhz, a bandwidth rejection of greater than 110dB, a bandwidth rejection of greater than 67dB in a frequency range from 1760Mhz-3800Mhz, a bandwidth rejection of greater than 30dB in a frequency range from 4900Mhz-5415Mhz, a bandwidth rejection of greater than 35dB in a frequency range from 5415Mhz-5470Mhz, a bandwidth rejection of greater than 47dB in a frequency range from 5470Mhz-5640Mhz, a bandwidth rejection of greater than 78dB in a frequency range from 5640Mhz-5925Mhz, a bandwidth rejection of greater than 42dB in a frequency range from 54740 Mhz-5925Mhz, a bandwidth rejection of greater than 35dB in a frequency range from 54720 Mhz-7520Mhz, a bandwidth rejection of greater than 25dB in a frequency range from 7520Mhz-9025Mhz, a bandwidth rejection of greater than 25dB in a frequency range from 9420 Mhz-9400Mhz, a bandwidth rejection of greater than 26dB in a frequency range from 7520Mhz-9025Mhz, a frequency rejection of greater than 26Mhz, the bandwidth rejection is greater than 9 dB. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the frequency band curve 21 in fig. 6, one inductive cross-coupling zero 131 of the first filtering branch 13 is zero a, and the frequency of the zero a is 1914Mhz, where the bandwidth rejection is greater than 110 dB.

As shown in fig. 7, fig. 7 is a schematic diagram of a second simulation result of the filter provided in the present application. Through experimental tests, the bandwidths of the second filtering branch 14, the fourth filtering branch 17, the sixth filtering branch 113 and the eighth filtering branch 116 of the present application are in the range of 1709Mhz-1786Mhz, as shown in the frequency band curve 22 in fig. 7.

Wherein the band curve 22 has a bandwidth rejection of greater than 60dB in the frequency range between 1Mhz and 1416Mhz, a bandwidth rejection of greater than 50dB in the frequency range between 1416Mhz and 1518Mhz, a bandwidth rejection of greater than 25dB in the frequency range between 1518Mhz and 1690Mhz, a bandwidth rejection of greater than 95dB in the frequency range between 1805Mhz and 1880Mhz, a bandwidth rejection of greater than 70dB in the frequency range between 1880Mhz and 3800Mhz, a bandwidth rejection of greater than 35dB in the frequency range between 3800Mhz and 4450Mhz, and a bandwidth rejection of greater than 14dB in the frequency range between 4450Mhz and 4504 Mhz. Therefore, the performance of the filter 10 such as out-of-band rejection can be improved.

Further, as shown in the frequency band curve 22 in fig. 7, one inductive cross-coupling zero 141 of the second filtering branch 14 is a zero B, and the frequency of the zero B is 1810Mhz, where the bandwidth rejection is greater than 120 dB.

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.

Therefore, the filter 10 of the present application can reduce the size of the filter 10 and improve the performance of the filter 10 such as out-of-band rejection.

The present application further provides a communication device, as shown in fig. 8, fig. 8 is a schematic structural diagram of an embodiment of the communication device of the present application. The communication device 30 of the present embodiment includes an antenna 31 and a radio frequency unit 32 connected to the antenna 31, the radio frequency unit 32 includes the filter 10 as shown in the above-mentioned embodiment, and the filter 10 is used for filtering the radio frequency signal. In other embodiments, the rf Unit 32 may be integrally designed with the Antenna 31 to form an Active Antenna Unit (AAU).

Some embodiments of the present application are referred to as filters, and it is understood that in other embodiments, the present application may also be a combiner, i.e., a dual-frequency combiner.

The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

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

2. The filter of claim 1, further comprising: a first common cavity, a second common cavity, a third common cavity and a fourth common cavity;

3. The filter of claim 2, wherein the first, third, fifth and seventh filtering branches each comprise four capacitive cross-coupling zeros;

4. The filter according to any of claims 1 to 3, wherein capacitive cross coupling is respectively performed between the third filter cavity and the fifth filter cavity, between the third filter cavity and the sixth filter cavity, between the sixth filter cavity and the eighth filter cavity, and between the eighth filter cavity and the tenth filter cavity of the first filter branch;

5. The filter of claim 4, wherein the filter has a housing with a first orientation and a second orientation that are perpendicular to each other,

6. The filter according to claim 4, wherein the first, third, fifth and seventh filtering branches are transmitting filtering branches, respectively;

7. The filter according to claim 3, wherein the first, third, fifth and seventh filtering branches are respectively provided with fly bars to form the four capacitive cross-coupling zeros;

8. The filter according to claim 7, wherein the second, third, sixth and seventh filter cavities of the first filter branch are in a row and are arranged in sequence along the first direction;

9. The filter according to claim 8, wherein the eighth filter cavity, the fifth filter cavity and the first filter cavity of the second filter branch are aligned in a row and arranged in sequence along the first direction;

10. A communication system, comprising a terminal and a base station, wherein the base station comprises a base station antenna and a radio frequency unit connected to the base station antenna, and wherein the radio frequency unit comprises a filter according to any one of claims 1 to 9, and wherein the filter is configured to filter a radio frequency signal.