CN113131142A

CN113131142A - Filter and communication equipment

Info

Publication number: CN113131142A
Application number: CN201911405041.8A
Authority: CN
Inventors: 温世议; 宋文刚; 韩军平; 陈砚昌
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-16

Abstract

The application discloses wave filter and communication equipment, this wave filter includes: a housing having a first direction and a second direction perpendicular to the first direction; a first common cavity disposed on the first side of the housing; the first filtering branch and the second filtering branch which are adjacently arranged are arranged on the first side of the shell, are respectively coupled with the first public cavity, respectively consist of ten filtering cavities and eight filtering cavities which are sequentially coupled, and respectively form four and three first and second cross-coupling zero points. The distances between the nth filter cavity of the first filter branch and the mth filter cavity of the second filter branch and the (n + 1) th and (m + 1) th filter cavities are respectively equal to the distances between the (n + 1) th filter cavity of the first filter branch and the (m + 1) th filter cavity of the second filter branch and the (n + 2) th and (m + 2) th filter cavities, n is an integer greater than 0 and less than 9, and m is an integer greater than 0 and less than 7. By the method, the out-of-band rejection performance of the filter can be improved, and the size of the filter can be reduced.

Description

Filter and communication equipment

Technical Field

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

Background

In a mobile communication system, 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. And if multiple channels exist, the high isolation between the pass bands of the channels should be considered.

The inventor of the present application finds, in long-term research and development work, that a filter in the prior art generally includes two or more groups of filter branches with different frequencies, but the arrangement of different filter branches is not tight, the arrangement of adjacent cavities in the filter branches is not equidistant, and a common cavity is not provided, so that the problem that the size of the existing filter is too large is caused, and the problem is particularly serious when more filter branches are involved; moreover, when a plurality of filtering branches exist at the same time, the performance of the filter, such as out-of-band rejection, is poor, and it is difficult to achieve high isolation between channel signals of different filtering branches.

Disclosure of Invention

The present application provides a filter and a communication device to solve the above problems.

In order to solve the technical problem, the application adopts a technical scheme that: there is provided a filter comprising: a housing having a first direction and a second direction perpendicular to the first direction; a first common cavity disposed on the first side of the housing; the first filtering branch is arranged on the first side of the shell, is coupled with the first common cavity, and consists of ten filtering cavities which are sequentially coupled, and the ten filtering cavities of the first filtering branch form four first cross-coupling zeros; the second filtering branch is arranged adjacent to the first filtering branch, is coupled with the first common cavity and consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities of the second filtering branch form three second cross coupling zero points; the distance between the nth filter cavity and the (n + 1) th filter cavity of the first filter branch is equal to the distance between the (n + 1) th filter cavity and the (n + 2) th filter cavity of the first filter branch, and n is an integer which is greater than 0 and less than 9; the distance between the mth filter cavity and the (m + 1) th filter cavity of the second filter branch circuit is equal to the distance between the (m + 1) th filter cavity and the (m + 2) th filter cavity of the first filter branch circuit, and m is an integer which is greater than 0 and less than 7. The first filtering branch and the second filtering branch are coupled with the first common cavity, so that the number of taps and welding points can be reduced, and the size of the filter can be reduced. The first filtering branch and the second filtering branch are both provided with cross coupling zero points, zero point suppression is realized through the zero points, the out-of-band suppression performance of the filter can be improved, and further the isolation between the first filtering branch and the second filtering branch is improved. The distance between the nth filtering cavity and the nth +1 filtering cavity through the first filtering branch is equal to the distance between the nth +1 filtering cavity and the nth +2 filtering cavity of the first filtering branch, the distance between the mth filtering cavity and the mth +1 filtering cavity of the second filtering branch is equal to the distance between the mth +1 filtering cavity and the mth +2 filtering cavity of the first filtering branch, the filtering cavities of the first filtering branch and the second filtering branch can be tightly arranged, and the design and the manufacture of the filter are facilitated, and the structure of the filter is compact so as to reduce the size of the filter.

Furthermore, a first filtering cavity, a second filtering cavity and an eighth filtering cavity of the first filtering branch are in a row and are sequentially arranged along a first direction; the third filtering cavity, the seventh filtering cavity and the ninth 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 sixth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row, and the tenth filtering cavity, the sixth filtering cavity, the fifth filtering cavity and the fourth filtering cavity of the first filtering branch deviate from the middle branching line of the shell in the second direction in sequence; the first filtering cavity of the first filtering branch circuit is intersected with the first common cavity, and an included angle formed by a connecting line of centers of the first filtering cavity and the second filtering cavity of the first filtering branch circuit and a connecting line of centers of the first filtering cavity and the first common cavity of the first filtering branch circuit is an acute angle; the second filter cavity of the first filter branch is respectively intersected with the first filter cavity and the eighth filter cavity of the first filter branch, the second filter cavity of the first filter branch is respectively adjacent to the third filter cavity and the seventh filter cavity of the first filter branch, the seventh filter cavity of the first filter branch is respectively intersected with the third filter cavity and the ninth filter cavity of the first filter branch, the sixth filter cavity of the first filter branch is intersected with the fifth filter cavity and the tenth filter cavity of the first filter branch, the fifth filter cavity of the first filter branch is intersected with the third filter cavity of the first filter branch, and the fourth filter cavity of the first filter branch is adjacent to the third filter cavity and the fifth filter cavity of the first filter branch. Capacitive cross coupling is respectively carried out between the first filtering cavity and the third filtering cavity of the first filtering branch, between the third filtering cavity and the fifth filtering cavity of the first filtering branch, and between the seventh filtering cavity and the ninth filtering cavity of the first filtering branch, and inductive cross coupling is carried out between the sixth filtering cavity and the ninth filtering cavity of the first filtering branch, so that four first cross coupling zeros are formed. The adjacent setting between the wave cavity is filtered to the logical expert for the clearance between the filtering cavity further reduces, and then makes the compact structure of wave filter, and then can reduce the volume of wave filter. Moreover, through the crossed arrangement of the filter cavities, the traditional filter can be prevented from arranging a partition wall between the mutually coupled filter cavities, and a window is arranged on the partition wall, so that the filter is convenient to manufacture, materials are saved, and the manufacturing cost is reduced.

Furthermore, a first filtering cavity, a second filtering cavity and a third filtering cavity of the second filtering branch circuit are arranged in a triangular mode; the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the second filtering branch are arranged in a quadrilateral manner, and the fourth filtering cavity and the sixth filtering cavity of the second filtering branch are arranged in a diagonal manner; the first filtering cavity of the second filtering branch is intersected with the first common cavity, the first filtering cavity and the third filtering cavity of the second filtering branch are arranged at intervals, and connecting lines of centers of the common cavity, the first filtering cavity of the second filtering branch and the third filtering cavity of the second filtering branch are positioned on the same straight line; a second filter cavity of the second filter branch is respectively adjacent to a first filter cavity and a third filter cavity of the second filter branch, and the first filter cavity and the third filter cavity of the second filter branch are respectively adjacent to a fourth filter cavity of the first filter branch; the projection of the center of the third filter cavity of the second filter branch in the first direction is positioned between the projections of the centers of the first filter cavity and the second filter cavity of the second filter branch in the first direction, and the projection of the center of the second filter cavity of the second filter branch in the second direction is positioned between the projections of the centers of the first filter cavity and the third filter cavity of the second filter branch in the second direction; a fourth filter cavity of the second filter branch is respectively intersected with a third filter cavity, a fifth filter cavity and a sixth filter cavity of the second filter branch, the fourth filter cavity and the seventh filter cavity of the second filter branch are arranged at intervals, the sixth filter cavity of the second filter branch is intersected with the fifth filter cavity of the second filter branch, the seventh filter cavity of the second filter branch is respectively adjacent to an eighth filter cavity of the second filter branch and the sixth filter cavity of the second filter branch, and an included angle formed by a connecting line of centers of the seventh filter cavity and the eighth filter cavity of the second filter branch and a mid-parting line of the shell in the second direction is an acute angle; and the first filtering cavity and the third filtering cavity of the second filtering branch, the fourth filtering cavity and the sixth filtering cavity of the second filtering branch and the fourth filtering cavity and the seventh filtering cavity of the second filtering branch are in inductive cross coupling respectively to form three second cross coupling zero points. The adjacent setting between the wave cavity is filtered to the logical expert for the clearance between the filtering cavity further reduces, and then makes the compact structure of wave filter, and then can reduce the volume of wave filter. And, through crossing setting between the filtering chamber, can save the material and then reduce manufacturing cost. And the cross coupling zero points of the second filtering branch are inductive cross coupling zero points, so that the material consistency is good, the manufacture is convenient, and the stability of the filter is improved.

The embodiment of the application at least has the following beneficial effects: different from the prior art, on one hand, the filtering branches and the cavities in the filtering branches are closely arranged through the arrangement of the common cavity, the adjacent arrangement of the filtering branches and the equidistant arrangement of the specific adjacent filtering cavities, so that the size of the filter can be reduced; on the other hand, zero point suppression is realized through the cross coupling zero point, and isolation among different filtering branches can be improved.

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 structural diagram of a first embodiment of a filter provided in the present application;

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

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

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

fig. 5 is a schematic diagram of a topology of a third filtering branch of the filter provided in the present application;

fig. 6 is a schematic diagram of a second side of a filter according to a third embodiment of the filter provided herein;

fig. 7 is a schematic diagram of a topology of a fifth filtering branch of the filter provided in the present application;

fig. 8 is a schematic diagram of a topology of a sixth filtering branch of the filter provided in the present application;

FIG. 9 is a diagram illustrating simulation results of a filter provided herein;

fig. 10 is a schematic diagram of an embodiment of a communication device provided herein.

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 apparatus 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 apparatus.

Please refer to fig. 1, which is a schematic structural diagram of a filter 10 according to a first embodiment of the present application.

As shown in fig. 1, the filter 10 of the present embodiment includes: the housing 201 has a first direction D1 and a second direction D2 perpendicular to the first direction D1. A first common chamber P1 is disposed on the first side of the housing 201. The first filtering branch 101 is disposed on the first side of the casing 201, coupled to the first common cavity P1, and composed of ten filtering cavities coupled in sequence, and the ten filtering cavities of the first filtering branch 101 form four first cross-coupling zeros. And the second filtering branch 102 is arranged adjacent to the first filtering branch 101, is coupled with the first common cavity P1, and consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities of the second filtering branch 102 form three second cross-coupling zeros. The distance between the nth filter cavity and the (n + 1) th filter cavity of the first filter branch 101 is equal to the distance between the (n + 1) th filter cavity and the (n + 2) th filter cavity of the first filter branch 101, and n is an integer greater than 0 and less than 9. The distance between the mth filter cavity and the (m + 1) th filter cavity of the second filter branch 102 is equal to the distance between the (m + 1) th filter cavity and the (m + 2) th filter cavity of the first filter branch 101, and m is an integer greater than 0 and less than 7.

Preferably, in this embodiment, the first filtering branch 101 is a transmitting filtering branch, and the second filtering branch 102 is a receiving filtering branch. Of course, in some other embodiments, the first filtering branch 101 may also be a receiving filtering branch, and the second filtering branch 102 may also be a transmitting filtering branch.

The coupling zero point is also called a transmission zero point, so that zero point suppression can be realized, and the debugging of indexes is facilitated. 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 complete 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.

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.

As above, the first filtering branch 101 and the second filtering branch 102 are both coupled to the first common cavity, so that the number of taps and welding points can be reduced, and the size of the filter 10 can be reduced, thereby saving materials. The first filtering branch 101 and the second filtering branch 102 both form a coupling zero point, and zero point suppression is realized through the zero point, so that out-of-band suppression performance of the filter 10 can be improved, and further, isolation of different filtering branches of the filter 10 is improved. The distance between the nth filter cavity and the nth +1 filter cavity through the first filter branch 101 is equal to the distance between the nth +1 filter cavity and the nth +2 filter cavity of the first filter branch 101, the distance between the mth filter cavity and the mth +1 filter cavity of the second filter branch 102 is equal to the distance between the mth +1 filter cavity and the mth +2 filter cavity of the first filter branch 101, the filter cavities of the filter branches can be arranged relatively tightly, and the design and manufacture are facilitated, and the size of the filter 10 is reduced due to the compact structure of the filter 10.

Specifically, the ten filter cavities of the first filter branch 101 are specifically the first filter cavity a1 of the first filter branch 101 to the tenth filter cavity a10 of the first filter branch 101.

Specifically, as shown in fig. 1, the first filter cavity a1, the second filter cavity a2, and the eighth filter cavity A8 of the first filter branch 101 are in a row and are sequentially arranged along a first direction D1; the third filtering cavity A3, the seventh filtering cavity a7 and the ninth filtering cavity a9 of the first filtering branch 101 are in a row and are sequentially arranged along a first direction D1; the fourth filtering cavity a4, the fifth filtering cavity a5, the sixth filtering cavity a6 and the tenth filtering cavity a10 of the first filtering branch 101 are in a row, and the tenth filtering cavity a10, the sixth filtering cavity a6, the fifth filtering cavity a5 and the fourth filtering cavity a4 of the first filtering branch 101 deviate from the middle branching line of the housing in the second direction D2 in sequence; the first filtering cavity a1 of the first filtering branch 101 and the first common cavity P1 are arranged in an intersecting manner, and an included angle between a connecting line of centers of the first filtering cavity a1 and the second filtering cavity a2 of the first filtering branch 101 and a connecting line of the first filtering cavity a1 and the first common cavity P1 of the first filtering branch 101 is an acute angle; the second filter cavity a2 of the first filter branch 101 intersects with the first filter cavity a1 and the eighth filter cavity A8 of the first filter branch 101, the second filter cavity a2 of the first filter branch 101 intersects with the third filter cavity A3 and the seventh filter cavity a7 of the first filter branch 101, the seventh filter cavity a7 of the first filter branch 101 intersects with the third filter cavity A3 and the ninth filter cavity a9 of the first filter branch 101, the sixth filter cavity A6 of the first filter branch 101 intersects with the fifth filter cavity a5 and the tenth filter cavity a10 of the first filter branch 101, the fifth filter cavity a5 of the first filter branch 101 intersects with the third filter cavity A3 of the first filter branch 101, and the fourth filter cavity a4 of the first filter branch 101 intersects with the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 101.

The ten filter cavities of the first filter branch 101 are roughly divided into three rows along the second direction D2 by the arrangement, which is regular, and the filter 10 is easy to design and manufacture and can be reduced in size. In addition, the adjacent arrangement of the filter cavities further reduces the gap between the filter cavities, so that the structure of the filter 10 is compact, and the size of the filter 10 can be reduced. Moreover, the intersecting arrangement of the filter cavities can avoid the traditional filter 10 that a partition wall is arranged between the mutually coupled filter cavities and a window is arranged on the partition wall, so that the filter is convenient to manufacture, saves materials and further reduces the manufacturing cost. It should be noted that the filter cavity shown in the drawings of the present application is represented by a circle, but in actual manufacturing, the shape of the filter cavity may not be a circle, and the adjacent arrangement refers to: a shared cavity wall is arranged between the filter cavities; the intersection setting at this time means: a shared cavity wall is arranged between the filter cavities, the centers of the two filter cavities are used as the origin, and circles formed by taking the farthest distance from the origin to the cavity wall of the filter cavity as the radius intersect. Specifically, referring to fig. 2, fig. 2 is a schematic diagram of a topology of a first filtering path of the filter 10 provided in the present application.

As shown in the figure, capacitive cross coupling is respectively performed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 101, between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 101, between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 101, and inductive cross coupling is performed between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 101, so as to form four first cross coupling zeros.

Zero point suppression can be realized through the cross coupling zero point, so that the indexes are convenient to debug, and high isolation among different channels is realized.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. That is, flying bars are respectively disposed between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 101, between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 101, and between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 101, so that the first filter cavity a1 and the third filter cavity A3 of the first filter branch 101, between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 101, and between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 101 are capacitively and cross-coupled, respectively, and are equivalent to C1, C2, and C3 shown in fig. 2. And, the position relationship between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 101, between the third filter cavity A3 and the fifth filter cavity a5 of the first filter branch 101, and between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 101 is combined. In this application, between first filtering chamber a1 and the third filtering chamber A3 of first filtering branch 101, between third filtering chamber A3 and the fifth filtering chamber a5 of first filtering branch 101, the distance between seventh filtering chamber a7 and the ninth filtering chamber a9 of first filtering branch 101 equals, consequently, can realize adopting the same specification flying rod component, in order to reach the effect of realizing three capacitive coupling zero point, be convenient for design and manufacturing simultaneously.

More specifically, a window may be disposed between the sixth filtering cavity a6 of the first filtering branch 101 and the ninth filtering cavity a9 of the first filtering branch 101, and a metal coupling rib is disposed on the window, so that an inductive cross-coupling is implemented between the sixth filtering cavity a6 of the first filtering branch 101 and the ninth filtering cavity a9 of the first filtering branch 101, and an inductive cross-coupling zero is formed, which is equivalent to the inductance L1 shown in fig. 2.

The inductive cross coupling is realized through the metal coupling ribs, the metal coupling ribs are small in change of external temperature, and the filter 10 is prevented from generating temperature drift.

Specifically, in particular, the filter 10 further includes a first port (not shown) connected to the tenth filter cavity a10 of the first filter branch 101, wherein the first port may be a tap of the filter 10.

The resonant frequencies of the first filter cavity a1 of the first filter branch 101 to the tenth filter cavity a10 of the first filter branch 101 are sequentially in the following ranges:

941-943Mhz、928Mhz-930Mhz、941Mhz-943Mhz、929Mhz-931Mhz、940Mhz-942Mhz、940Mhz-942Mhz、938Mhz-940Mhz、925Mhz-927Mhz、940Mhz-942Mhz、942Mhz-944Mhz。

a coupling bandwidth between the first common cavity and the first filter cavity a1 of the first filter branch 101, a coupling bandwidth between the first filter cavity a1 of the first filter branch 101 and the second filter cavity a2 of the first filter branch 101, a coupling bandwidth between the second filter cavity a2 of the first filter branch 101 and the third filter cavity A3 of the first filter branch 101, a coupling bandwidth between the second filter cavity a2 of the first filter branch 101 and the third filter cavity A3 of the first filter branch 101, a coupling bandwidth between the third filter cavity A3 of the first filter branch 101 and the fourth filter cavity A4 of the first filter branch 101, a coupling bandwidth between the third filter cavity A3 of the first filter branch 101 and the fifth filter cavity A5 of the first filter branch 101, A4 of the first filter branch 101 and the fifth filter cavity a 383 of the first filter branch 101, a coupling bandwidth between the fourth filter cavity A4 of the first filter branch 101 and the fifth filter cavity A5 of the first filter branch 101, and A6 of the fifth filter cavity a 4642 of the first filter branch 101, The coupling bandwidth between the sixth filter cavity a6 of the first filter branch 101 and the seventh filter cavity a7 of the first filter branch 101, the coupling bandwidth between the sixth filter cavity a6 of the first filter branch 101 and the ninth filter cavity a9 of the first filter branch 101, the coupling bandwidth between the seventh filter cavity a7 of the first filter branch and the eighth filter cavity A8 of the first filter branch 101, the coupling bandwidth between the seventh filter cavity a7 of the first filter branch 101 and the ninth filter cavity a9 of the first filter branch 101, the coupling bandwidth between the eighth filter cavity A8 of the first filter branch 101 and the ninth filter cavity a9 of the first filter branch 101, the coupling bandwidth between the ninth filter cavity a9 of the first filter branch 101 and the tenth filter cavity a10 of the first filter branch 101, and the coupling bandwidth between the tenth filter cavity a10 and the first port of the first filter branch 101 are respectively in the following ranges:

69Mhz-81Mhz、17Mhz-23Mhz、11Mhz-16Mhz、14Mhz-20Mhz、15Mhz-21Mhz、8Mhz-13Mhz、14Mhz-20Mhz、17Mhz-23Mhz、17Mhz-23Mhz、1Mhz-6Mhz、10Mhz-15Mhz、12Mhz-18Mhz、13Mhz-19Mhz、29Mhz-36Mhz。

therefore, the bandwidth of the first filtering branch 101 can be within 919-962MHz, and the design requirement can be met.

Specifically, the eight filter cavities of the second filter branch 102 are the first filter cavity B1 of the second filter branch 102 and the eighth filter cavity B8 of the second filter branch 102.

As shown in fig. 1, the first filter cavity B1, the second filter cavity B2 and the third filter cavity B3 of the second filter branch 102 are arranged in a triangle; the fourth filtering cavity B4, the fifth filtering cavity B5, the sixth filtering cavity B6 and the seventh filtering cavity B7 of the second filtering branch 102 are arranged in a quadrilateral manner, and the fourth filtering cavity B4 and the sixth filtering cavity B6 of the second filtering branch 102 are arranged in a diagonal manner; the first filtering cavity B1 of the second filtering branch 102 intersects with the first common cavity P1, the first filtering cavity B1 and the third filtering cavity B3 of the second filtering branch 102 are arranged at intervals, and the connecting lines of the centers of the first common cavity P1, the first filtering cavity B1 of the second filtering branch 102 and the third filtering cavity B3 of the second filtering branch 102 are located on the same straight line; the second filtering cavity B2 of the second filtering branch 102 is respectively adjacent to the first filtering cavity B1 and the third filtering cavity B3 of the second filtering branch 102, and the first filtering cavity B1 and the third filtering cavity B3 of the second filtering branch 102 are respectively adjacent to the fourth filtering cavity a4 of the first filtering branch 101; the projection of the center of the third filter cavity B3 of the second filter branch 102 in the first direction D1 is located between the projections of the centers of the first filter cavity B1 and the second filter cavity B2 of the second filter branch 102 in the first direction D1, and the projection of the center of the second filter cavity B2 of the second filter branch 102 in the second direction D2 is located between the projections of the centers of the first filter cavity B1 and the third filter cavity B3 of the second filter branch 102 in the second direction D2; the fourth filter cavity B4 of the second filter branch 102 intersects with the third filter cavity B3, the fifth filter cavity B5 and the sixth filter cavity B6 of the second filter branch 102, the fourth filter cavity B4 and the seventh filter cavity B7 of the second filter branch 102 are arranged at intervals, the sixth filter cavity B6 of the second filter branch 102 intersects with the fifth filter cavity B5 of the second filter branch 102, the seventh filter cavity B7 of the second filter branch 102 is arranged adjacent to the eighth filter cavity B8 of the second filter branch 102 and the sixth filter cavity B6 of the second filter branch 102, and an included angle between a connecting line of centers of the seventh filter cavity B7 and the eighth filter cavity B8 of the second filter branch 102 and a branching line of the housing in the second direction D2 is an acute angle.

The adjacent arrangement of the filter cavities further reduces the gap between the filter cavities, so that the structure of the filter 10 is compact, and the size of the filter 10 can be reduced. Moreover, the intersecting arrangement of the filter cavities can avoid the traditional filter 10 that a partition wall is arranged between the mutually coupled filter cavities and a window is arranged on the partition wall, so that the filter is convenient to manufacture, saves materials and further reduces the manufacturing cost.

Specifically, referring to fig. 3, fig. 3 is a schematic diagram of a topology of a second filtering path of the filter 10 provided in the present application.

As shown in fig. 3, inductive cross-coupling is performed between the first filter cavity B1 and the third filter cavity B3 of the second filter branch 102, between the fourth filter cavity B4 and the sixth filter cavity B6 of the second filter branch 102, and between the fourth filter cavity B4 and the seventh filter cavity B7 of the second filter branch 102, respectively, to form three second cross-coupling zeros.

More specifically, windows may be disposed between the first filter cavity B1 of the second filter branch 102 and the third filter cavity B3 of the second filter branch 102, between the fourth filter cavity B4 of the second filter branch 102 and the sixth filter cavity B6 of the second filter branch 102, between the fourth filter cavity B4 of the second filter branch 102 and the seventh filter cavity B7 of the second filter branch 102, and metal coupling ribs are disposed on the windows, so that inductive couplings are respectively implemented between the first filter cavity B1 of the second filter branch 102 and the third filter cavity B3 of the second filter branch 102, between the fourth filter cavity B4 of the second filter branch 102 and the sixth filter cavity B6 of the second filter branch 102, between the fourth filter cavity B4 of the second filter branch 102 and the seventh filter cavity B7 of the second filter branch 102, and inductive cross-couplings are respectively formed, and zero points are respectively equivalent to inductance L1 and L2L 5956 of fig. 2, and zero points are respectively equivalent to inductive cross-coupling, L3.

Specifically, the filter 10 further includes a first port (not shown) connected to the eighth filter cavity B8 of the second filter branch 102, wherein the first port may be a tap of the filter 10.

The resonant frequencies of the first filter cavity B1 of the second filter branch 102 to the eighth filter cavity B8 of the second filter branch 102 are sequentially in the following ranges:

896-898Mhz、906Mhz-908Mhz、896Mhz-898Mhz、896Mhz-898Mhz、912Mhz-914Mhz、899Mhz-901Mhz、897Mhz-899Mhz、896Mhz-898Mhz。

a coupling bandwidth between the common cavity and the first filter cavity B1 of the second filter branch 102, a coupling bandwidth between the first filter cavity B1 of the second filter branch 102 and the second filter cavity B2 of the second filter branch 102, a coupling bandwidth between the first filter cavity B1 of the second filter branch 102 and the third filter cavity B3 of the second filter branch 102, a coupling bandwidth between the second filter cavity B2 of the second filter branch 102 and the third filter cavity B3 of the second filter branch 102, a coupling bandwidth between the third filter cavity B3 of the second filter branch 102 and the fourth filter cavity B4 of the second filter branch 102, a coupling bandwidth between the fourth filter cavity B4 of the second filter branch 102 and the fifth filter cavity B2 of the second filter branch 102, a coupling bandwidth between the fourth filter cavity B4 of the second filter branch 102 and the sixth filter cavity B6 of the second filter branch 102, and a coupling bandwidth between the fourth filter cavity B7 of the second filter branch 102 and the seventh filter cavity B68542 of the second filter branch 102, The coupling bandwidth between the fifth filter cavity B5 of the second filter branch 102 and the sixth filter cavity B6 of the second filter branch 102, the coupling bandwidth between the sixth filter cavity B6 of the second filter branch 102 and the seventh filter cavity B7 of the second filter branch 102, the coupling bandwidth between the seventh filter cavity B7 of the second filter branch and the eighth filter cavity B8 of the second filter branch 102, and the coupling bandwidth between the eighth filter cavity B8 of the second filter branch 102 and the first port are respectively in the following ranges:

68Mhz-80Mhz、20Mhz-26Mhz、9Mhz-14Mhz、16Mhz-22Mhz、18Mhz-24Mhz、12Mhz-17Mhz、12Mhz-17Mhz、2Mhz-6Mhz、10Mhz-15Mhz、20Mhz-26Mhz、29Mhz-36Mhz、36Mhz-44Mhz。

therefore, the bandwidth of the second filtering branch 102 can be within 878-919MHz, and the design requirement is met.

The embodiment has at least the following beneficial effects: different from the prior art, on one hand, the filtering branches and the cavities in the filtering branches are closely arranged through the arrangement of the common cavity, the adjacent arrangement of the filtering branches and the equidistant interval arrangement of the specific adjacent filtering cavities, so that the size of the filter is reduced; on the other hand, zero point suppression is realized through the cross coupling zero point, and isolation among different filter branches is improved

Referring to fig. 4, fig. 4 is a schematic structural diagram of a filter according to a second embodiment of the present application.

As shown in fig. 4, the filter 10 of the present embodiment further includes, in addition to the first embodiment: a second common chamber P2 disposed on the first side of the housing 201; the third filtering branch 103 is arranged adjacent to the second filtering branch 102, is coupled with the second common cavity P2 and consists of eight filtering cavities which are sequentially coupled, and three third cross-coupling zero points are formed by the eight filtering cavities; and the fourth filtering branch 104 is arranged adjacent to the third filtering branch 103, is coupled with the second common cavity P2, and consists of ten filtering cavities which are sequentially coupled, wherein the ten filtering cavities form four fourth cross-coupling zeros.

Preferably, in this embodiment, the third filtering branch 103 is a receiving filtering branch, and the fourth filtering branch 104 is a transmitting filtering branch. Of course, in some other embodiments, the third filtering branch 103 may also be a transmitting filtering branch, and the fourth filtering branch 104 may also be a receiving filtering branch.

The second filtering branch 102, the third filtering branch 103 and the fourth filtering branch 104 are adjacently arranged, so that the structure of the filter 10 is compact, and the size of the filter 10 is reduced. Zero point suppression is realized through the cross coupling zero points of the third filtering branch 103 and the fourth filtering branch 104, so that high isolation between different filtering branches is realized.

Specifically, as shown in fig. 1, the eight filter cavities of the third filter branch 103 are divided into four rows arranged along the second direction D2; the sixth filtering cavity C6 and the eighth filtering cavity C8 of the third filtering branch 103 are in a row and are sequentially arranged along the first direction D1; the fifth filter cavity C5 and the seventh filter cavity C7 of the third filter branch 103 are in a row and are sequentially arranged along the first direction D1; the second filter cavity C2 and the fourth filter cavity C4 of the third filter branch 103 are in a row and are sequentially arranged along the first direction D1; the first filtering cavity C1 and the third filtering cavity C3 of the third filtering branch 103 are in a row and are sequentially arranged along the first direction D1; a sixth filtering cavity C6 of the third filtering branch 103 is respectively adjacent to a seventh filtering cavity B7 and an eighth filtering cavity B8 of the second filtering branch 102, and a fifth filtering cavity C5, a seventh filtering cavity C7 and an eighth filtering cavity C8 of the third filtering branch 103, a second filtering cavity C2 of the third filtering branch 103 is respectively adjacent to a fifth filtering cavity C5, a fourth filtering cavity C4 and a first filtering cavity C1 of the third filtering branch 103, and a third filtering cavity C3 of the third filtering branch 103 is respectively adjacent to a fourth filtering cavity C4 and a first filtering cavity C1 of the third filtering branch 103;

with the above arrangement, the eight filter cavities of the third filter branch 103 are roughly divided into three rows arranged along the second direction D2, so that the arrangement is regular, and the eight filter cavities are disposed adjacent to the second filter branch 102, so that the arrangement is compact, thereby facilitating the design and manufacture and reducing the size of the filter 10. In addition, the adjacent arrangement of the filter cavities further reduces the gap between the filter cavities, so that the structure of the filter 10 is compact, and the size of the filter 10 can be reduced.

Specifically, referring to fig. 5, fig. 5 is a schematic diagram of a topology structure of the third filtering branch 103 of the filter 10 provided in the present application.

As shown in fig. 5, inductive cross-coupling is performed between the first filter cavity C1 and the third filter cavity C3 of the third filter branch 103, between the fourth filter cavity C4 and the seventh filter cavity C7 of the third filter branch 103, and between the fifth filter cavity C5 and the seventh filter cavity C7 of the third filter branch 103, respectively, so as to form three third cross-coupling zeros.

Specifically, windows may be disposed between the first filter cavity C1 of the third filter branch 103 and the third filter cavity C3 of the third filter branch 103, between the fourth filter cavity C4 of the third filter branch 103 and the seventh filter cavity C7 of the third filter branch 103, between the fifth filter cavity C5 of the third filter branch 103 and the seventh filter cavity C7 of the third filter branch 103, and metal coupling ribs are disposed on the windows, so that inductive coupling is respectively achieved between the first filter cavity C1 of the third filter branch 103 and the third filter cavity C3 of the third filter branch 103, between the fourth filter cavity C4 of the third filter branch 103 and the seventh filter cavity C7 of the third filter branch 103, between the fifth filter cavity C5 of the third filter branch 103 and the seventh filter cavity C7 of the third filter branch 103, and inductive cross-coupling zeros are respectively formed, which are equivalent to the inductance L4625L 2L 465925L shown in fig. 2, equivalent to the cross-coupling zeros L1L 2L of fig. 2, L3.

The inductive cross coupling is realized through the metal coupling ribs, the metal coupling ribs are small in change of external temperature, and the filter 10 is prevented from generating temperature drift. In addition, all coupling zeros of the third filtering branch 103 are inductive cross-coupling zeros, so that the material consistency is good and the manufacturing is convenient.

In particular, the filter 10 further includes a first port (not shown) coupled to the eighth filter cavity C8 of the third filter branch 103, wherein the first port may be a tap of the filter 10.

The resonant frequencies of the first filter cavity C1 of the third filter branch 103 to the eighth filter cavity C8 of the third filter branch 103 are sequentially in the following ranges:

897-899Mhz、906Mhz-908Mhz、895Mhz-897Mhz、896Mhz-898Mhz、898Mhz-899Mhz、911Mhz-913Mhz、896Mhz-898Mhz、896Mhz-898Mhz。

a coupling bandwidth between the common cavity and the first filter cavity C1 of the third filter branch 103, a coupling bandwidth between the first filter cavity C1 of the third filter branch 103 and the second filter cavity C2 of the third filter branch 103, a coupling bandwidth between the first filter cavity C1 of the third filter branch 103 and the third filter cavity C3 of the third filter branch 103, a coupling bandwidth between the second filter cavity C2 of the third filter branch 103 and the third filter cavity C3 of the third filter branch 103, a coupling bandwidth between the third filter cavity C3 of the third filter branch 103 and the fourth filter cavity C4 of the third filter branch 103, a coupling bandwidth between the fourth filter cavity C4 of the third filter branch 103 and the fifth filter cavity C362 of the third filter branch 103, a coupling bandwidth between the fifth filter cavity C5 of the third filter branch 103 and the seventh filter cavity C7 of the third filter branch 103, a coupling bandwidth between the fifth filter cavity C5 of the third filter branch 103 and the seventh filter cavity C6853 of the third filter branch 103, and a coupling bandwidth between the third filter cavity C7 of the third filter branch 103 and the seventh filter cavity C68542 of the third filter branch 103, The coupling bandwidth between the fifth filter cavity C5 of the third filter branch 103 and the sixth filter cavity C6 of the third filter branch 103, the coupling bandwidth between the sixth filter cavity C6 of the third filter branch 103 and the seventh filter cavity C7 of the third filter branch 103, the coupling bandwidth between the seventh filter cavity C7 of the third filter branch 103 and the eighth filter cavity C8 of the third filter branch 103, and the coupling bandwidth between the eighth filter cavity C8 of the third filter branch 103 and the first port are respectively in the following ranges:

68Mhz-80Mhz、20Mhz-26Mhz、9Mhz-14Mhz、16Mhz-22Mhz、18Mhz-24Mhz、17Mhz-23Mhz、12Mhz-17Mhz、2Mhz-6Mhz、10Mhz-15Mhz、20Mhz-26Mhz、12Mhz-18Mhz、35Mhz-43Mhz。

therefore, the bandwidth of the third filtering branch 103 can be within 878-919MHz, and the design requirement is met.

Specifically, as shown in fig. 4, ten filter cavities of the fourth filter branch 104 are divided into four rows arranged along the second direction D2; the seventh filtering cavity D7 and the eighth filtering cavity D8 of the fourth filtering branch 104 are in a row and are sequentially arranged along the first direction D1; the sixth filtering cavity D6 and the ninth filtering cavity D9 of the fourth filtering branch 104 are in a row and are sequentially arranged along the first direction D1; the second filter cavity D2, the fifth filter cavity D5 and the tenth filter cavity D10 of the fourth filter branch 104 are in a row and are sequentially arranged along the first direction D1; the second common cavity P2, the first filter cavity D1 of the fourth filter branch 104, the third filter cavity D3 of the fourth filter branch 104, and the fourth filter cavity D4 of the fourth filter branch 104 are in a row and are sequentially arranged along the first direction D1; a seventh filter cavity D7 of the fourth filter branch 104 is respectively adjacent to the eighth filter cavity C8 of the third filter branch 103, the eighth filter cavity D8 of the fourth filter branch 104, the ninth filter cavity D9 of the fourth filter branch 104, and the sixth filter cavity D6 of the fourth filter branch 104, a fifth filter cavity D5 of the fourth filter branch 104 is respectively adjacent to the sixth filter cavity D6, the ninth filter cavity D9, the second filter cavity D2, the tenth filter cavity D10, the third filter cavity D3, and the fourth filter cavity D4 of the fourth filter branch 104, a second filter cavity D2 of the fourth filter branch 104 is adjacent to the third filter cavity C3, and the fourth filter cavity C4 of the third branch 103, and a first filter cavity D638 of the fourth filter branch 104 is adjacent to the second filter cavity D59692, the fourth filter cavity D1, and the third filter cavity D2 of the fourth filter branch 104 are arranged together;

through the above arrangement, the ten filter cavities of the fourth filter branch 104 are divided into four rows adjacently arranged in sequence along the second direction D2, and are arranged adjacent to the third filter branch 103, and the arrangement is regular, so that the design and manufacture are facilitated, and the size of the filter 10 can be reduced. In addition, the adjacent arrangement of the filter cavities further reduces the gap between the filter cavities, so that the structure of the filter 10 is compact, and the size of the filter 10 can be reduced.

Capacitive cross coupling is respectively performed between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 104, between the third filter cavity D3 and the fifth filter cavity D5 of the fourth filter branch 104, between the seventh filter cavity D7 and the ninth filter cavity D9 of the fourth filter branch 104, and inductive cross coupling is performed between the sixth filter cavity D6 and the ninth filter cavity D9 of the fourth filter branch 104, so as to form four fourth cross coupling zeros.

The cross-coupling manner of the fourth filtering branch 104 is the same as the cross-coupling manner of the first filtering branch 101, and therefore, the description thereof is omitted here.

The resonant frequencies of the first filtering cavity D1 to the tenth filtering cavity D10 of the fourth filtering branch 104 are respectively the same as the resonant frequency ranges of the first filtering cavity a1 to the tenth filtering cavity a10 of the first filtering branch 101, the resonant frequencies of the first filtering cavity D1 to the tenth filtering cavity D10 of the fourth filtering branch 104 are respectively the same as the resonant frequency ranges of the first filtering cavity a1 to the tenth filtering cavity a10 of the first filtering branch 101, and the coupling bandwidth ranges between the filtering cavities of the fourth filtering branch 104 are respectively the same as the coupling bandwidth ranges between the filtering cavities of the first filtering branch 101. For example, the range of the coupling bandwidth between the first filter cavity a1 and the third filter cavity A3 of the first filter branch 101 is equal to the range of the coupling bandwidth between the first filter cavity D1 and the third filter cavity D3 of the fourth filter branch 104.

The embodiment at least has the following beneficial effects: different from the prior art, on one hand, the filtering branches and the cavity body are closely arranged through the arrangement of the common cavity, the adjacent arrangement of the filtering branches and the adjacent arrangement of the specific adjacent filtering cavities, so that the size of the filter is reduced; on the other hand, zero point suppression is realized through the cross coupling zero point, and isolation among different filtering branches is improved.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a second side of a filter 10 according to a third embodiment of the filter 10 provided in the present application.

On the basis of the second embodiment, the filter 10 of the present embodiment further includes: a third common chamber P3 disposed on the second side of the housing 201; the fifth filtering branch 105 is arranged on the second side of the shell 201, is coupled with the third common cavity P3, and consists of eleven filtering cavities which are sequentially coupled, wherein the eleven filtering cavities form three fifth cross-coupling zeros; and the sixth filtering branch 106 is arranged adjacent to the fifth filtering branch 105, is coupled with the third common cavity P3, and consists of eight filtering cavities which are sequentially coupled, wherein the eight filtering cavities form two sixth cross-coupling zeros.

Preferably, in this embodiment, the fifth filtering branch 105 is a transmitting filtering branch, and the sixth filtering branch 106 is a receiving filtering branch. Of course, in some other embodiments, the fifth filtering branch 105 may also be a receiving filtering branch, and the sixth filtering branch 106 may also be a transmitting filtering branch.

Specifically, the first filter cavity E1 to the eighth filter cavity E8 of the fifth filter branch 105 are divided into two rows adjacently arranged along the second direction D2; the third filter cavity E3, the fourth filter cavity E4, the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 105 are in a row and are sequentially arranged along the first direction D1; the second filter cavity E2, the first filter cavity E1, the fifth filter cavity E5 and the seventh filter cavity E7 of the fifth filter branch 105 are in a row and are sequentially arranged along the first direction D1; the ninth filtering cavity E9, the tenth filtering cavity E10 and the eleventh filtering cavity E11 of the fifth filtering branch 105 are arranged in a triangle; the third filter cavity E3 of the fifth filter branch 105 is respectively adjacent to the second filter cavity E2 and the first filter cavity E1 of the fifth filter branch 105; the first filter cavity E1 of the fifth filter branch 105 intersects with the fourth filter cavity E4 of the fifth filter branch 105, the first filter cavity E1 of the fifth filter branch 105 is adjacent to the fifth filter cavity E5, the third filter cavity E3 and the second filter cavity E2 of the fifth filter branch 105, the seventh filter cavity E7 of the fifth filter branch 105 is adjacent to the fifth filter cavity E5, the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 105, the sixth filter cavity E6 of the fifth filter branch 105 is adjacent to the eighth filter cavity E8 of the fifth filter branch 105, the sixth filter cavity E6 of the fifth filter branch 105 is spaced from the fourth filter cavity E4 of the fifth branch 105, and the fourth filter cavity E4 of the fifth filter branch 105 intersects with the third filter cavity E3 of the fifth filter cavity E105; the ninth filter cavity E9 and the eleventh filter cavity E11 of the fifth filter branch 105 are sequentially arranged at intervals along the second direction D2, a projection of a center of the tenth filter cavity E10 of the fifth filter branch 105 in the second direction D2 is located between a center of the ninth filter cavity E9 of the fifth filter branch 105 and a projection of a center of the eleventh filter cavity E11 of the fifth filter branch 105 in the second direction D2, and the tenth filter cavity E10 of the fifth filter branch 105 intersects with the ninth filter cavity E9 and the eleventh filter cavity E11 of the fifth filter branch 105, respectively;

the eleven filter cavities of the fifth filter branch 105 are roughly divided into two rows arranged along the second direction D2 by the arrangement described above, which is relatively regular, and which facilitates design, manufacture and enables a reduction in the size of the filter 10. In addition, the adjacent arrangement of the filter cavities further reduces the gap between the filter cavities, so that the structure of the filter 10 is compact, and the size of the filter 10 can be reduced. Moreover, the intersecting arrangement of the filter cavities can avoid the traditional filter 10 that a partition wall is arranged between the mutually coupled filter cavities and a window is arranged on the partition wall, so that the filter is convenient to manufacture, saves materials and further reduces the manufacturing cost.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a topology of a fifth filtering branch 105 of the filter 10 according to the present application.

As shown in fig. 7, the fourth filter cavity E4 and the sixth filter cavity E6 of the fifth filter branch 105, the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 105 are inductively cross-coupled, and the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 105 are capacitively cross-coupled, so as to form three fifth cross-coupling zeros.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. That is, a flying bar is disposed between the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 105, so that the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 105 are capacitively cross-coupled, which is equivalent to C1 shown in fig. 2.

More specifically, windows may be disposed between the fourth filter cavity E4 of the fifth filter branch 105 and the sixth filter cavity E6 of the fifth filter branch 105, between the eighth filter cavity E8 of the fifth filter branch 105 and the tenth filter cavity E10 of the fifth filter branch 105, and metal coupling ribs are disposed on the windows, so that inductive cross coupling is respectively achieved between the fourth filter cavity E4 of the fifth filter branch 105 and the sixth filter cavity E6 of the fifth filter branch 105, and between the eighth filter cavity E8 of the fifth filter branch 105 and the tenth filter cavity E10 of the fifth filter branch 105, and inductive cross coupling zeros are respectively formed and are respectively equivalent to the inductors L1 and L2 shown in fig. 6.

In particular, the filter 10 further comprises a first port (not shown) coupled to the eleventh filter cavity E11 of the fifth filter branch 105, wherein the first port may be a tap of the filter 10.

The resonant frequencies of the first filter cavity E1 of the fifth filter branch 105 to the eleventh filter cavity E11 of the fifth filter branch 105 lie in the following ranges in turn:

807-809Mhz、805Mhz-808Mhz、805Mhz-808Mhz、805Mhz-808Mhz、912Mhz-914Mhz、805Mhz-807Mhz、791Mhz-793Mhz、805Mhz-807Mhz、813Mhz-815Mhz、806Mhz-808Mhz、806Mhz-808Mhz。

a coupling bandwidth between the third common cavity P3 and the first filter cavity E1 of the fifth filter branch 105, a coupling bandwidth between the first filter cavity E1 of the fifth filter branch 105 and the second filter cavity E2 of the fifth filter branch 105, a coupling bandwidth between the second filter cavity E2 of the fifth filter branch 105 and the third filter cavity E3 of the fifth filter branch 105, a coupling bandwidth between the third filter cavity E3 of the fifth filter branch 105 and the fourth filter cavity E4 of the fifth filter branch 105, a coupling bandwidth between the fourth filter cavity E4 of the fifth filter branch 105 and the fifth filter cavity E5 of the fifth filter branch 105, a coupling bandwidth between the fourth filter cavity E4 of the fifth filter branch 105 and the sixth filter cavity E6 of the fifth filter branch 105, a coupling bandwidth between the fifth filter cavity E5 of the fifth filter branch 105 and the sixth filter cavity E6 of the fifth filter branch 105, and a coupling bandwidth between the fifth filter cavity E8236 of the fifth filter branch 105, The coupling bandwidth between the sixth filter cavity E6 of the fifth filter branch 105 and the eighth filter cavity E8 of the fifth filter branch 105, the coupling bandwidth between the seventh filter cavity E7 of the fifth filter branch 105 and the eighth filter cavity E8 of the fifth filter branch 105, the coupling bandwidth between the eighth filter cavity E8 of the fifth filter branch 105 and the ninth filter cavity E9 of the fifth filter branch 105, the coupling bandwidth between the eighth filter cavity E8 of the fifth filter branch 105 and the tenth filter cavity E10 of the fifth filter branch 105, the coupling bandwidth between the ninth filter cavity E9 of the fifth filter branch 105 and the tenth filter cavity E10 of the fifth filter branch 105, the coupling bandwidth between the tenth filter cavity E10 of the fifth filter branch 105 and the eleventh filter cavity E11 of the fifth filter branch 105, and the coupling bandwidth between the eleventh filter cavity E11 and the first port of the fifth filter branch 105 are respectively in the following ranges:

30Mhz-37Mhz、18Mhz-24Mhz、15Mhz-21Mhz、14Mhz-20Mhz、12Mhz-18Mhz、4Mhz-9Mhz、12Mhz-18Mhz、7Mhz-12Mhz、11Mhz-16Mhz、7Mhz-12Mhz、12Mhz-18Mhz、6Mhz-11Mhz、14Mhz-20Mhz、23Mhz-30Mhz、30Mhz-37Mhz。

therefore, the bandwidth of the fifth filtering branch 105 can be within 789-825MHz, and the design requirement is met.

Specifically, the first filter cavity F1 through the seventh filter cavity F7 of the sixth filter branch 106 are divided into two rows adjacently arranged along the second direction D2; the third common cavity P3, the second filter cavity F2 of the sixth filter branch 106, the fourth filter cavity F4 of the sixth filter branch 106, and the sixth filter cavity F6 of the sixth filter branch 106 are in a row and are sequentially arranged along the first direction D1; the first filter cavity F1, the third filter cavity F3, the fifth filter cavity F5 and the seventh filter cavity F7 of the sixth filter branch 106 are in a row and are sequentially arranged along a first direction D1; an included angle between a connecting line of centers of the eighth filter cavity F8 and the seventh filter cavity F7 of the sixth filter branch 106 and a connecting line of centers of the fifth filter cavity F5 and the seventh filter cavity F7 of the sixth filter branch 106 is an acute angle; a third filter cavity F3 of the sixth filter branch 106 is respectively adjacent to a first filter cavity F1, a second filter cavity F2, a fourth filter cavity F4 and a fifth filter cavity F5 of the sixth filter branch 106, a seventh filter cavity F7 of the sixth filter branch 106 is respectively adjacent to a fifth filter cavity F5, a sixth filter cavity F6 and an eighth filter cavity F8 of the sixth filter branch 106, a seventh filter cavity F7 of the sixth filter branch 106 is adjacent to an eleventh filter cavity E11 of the fifth filter branch 105, a fourth filter cavity F4 of the sixth filter branch 106 is respectively adjacent to a sixth filter cavity F6 and a second filter cavity F2 of the sixth filter branch 106, and a second filter cavity F2 of the sixth filter branch 106 is respectively adjacent to a fourth filter cavity F4 and a third common cavity P3 of the sixth filter branch 106;

through the arrangement, the eight filter cavities of the sixth filter branch 106 are roughly divided into two rows arranged along the second direction D2, which are more regular and are disposed adjacent to the fifth filter branch 105, which is more compact, thereby facilitating design and manufacture and reducing the size of the filter 10. In addition, the adjacent arrangement of the filter cavities further reduces the gap between the filter cavities, so that the structure of the filter 10 is compact, and the size of the filter 10 can be reduced.

Referring to fig. 8, fig. 8 is a schematic diagram illustrating a topology of a sixth filtering branch 106 of the filter 10 according to the present application.

As shown in fig. 8, the second filter cavity F2 and the fourth filter cavity F4 of the sixth filter branch 106 and the fifth filter cavity F5 and the seventh filter cavity F7 of the sixth filter branch 106 are inductively cross-coupled to form two sixth cross-coupling zeros, respectively.

Zero point suppression can be realized through the cross coupling zero point, so that the indexes can be conveniently debugged and high isolation among different channels can be realized.

Generally, the capacitive coupling zero is realized by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. That is, flying rods are disposed between the second filter cavity F2 and the fourth filter cavity F4 of the sixth filter branch 106, and between the fifth filter cavity F5 and the seventh filter cavity F7 of the sixth filter branch 106, so that the second filter cavity F2 and the fourth filter cavity F4 of the sixth filter branch 106, and the fifth filter cavity F5 and the seventh filter cavity F7 of the sixth filter branch 106 are capacitively and cross-coupled, respectively, and are equivalent to C1 and C2 shown in fig. 7.

The cross-coupling zero points of the sixth filtering branch 106 are all capacitive cross-coupling zero points, and the material consistency is good and the manufacturing is convenient.

In particular, the filter 10 further includes a first port (not shown) coupled to the eighth filter cavity F8 of the sixth filter branch 106, wherein the first port may be a tap of the filter 10.

The resonant frequencies of the first filter cavity F1 of the sixth filter branch 106 to the eighth filter cavity F8 of the sixth filter branch 106 are sequentially in the following ranges:

846-848Mhz、846Mhz-848Mhz、836Mhz-838Mhz、846-848Mhz、846Mhz-848Mhz、837Mhz-839Mhz、846-848Mhz、846Mhz-848Mhz。

a coupling bandwidth between the third common cavity P3 and the first filter cavity F1 of the sixth filter branch 106, a coupling bandwidth between the first filter cavity F1 of the sixth filter branch 106 and the second filter cavity F2 of the sixth filter branch 106, a coupling bandwidth between the second filter cavity F2 of the sixth filter branch 106 and the third filter cavity F3 of the sixth filter branch 106, a coupling bandwidth between the third filter cavity F3 of the sixth filter branch 106 and the fourth filter cavity F4 of the sixth filter branch 106, a coupling bandwidth between the second filter cavity F2 of the sixth filter branch 106 and the fourth filter cavity F4 of the sixth filter branch 106, a coupling bandwidth between the fourth filter cavity F4 of the sixth filter branch 106 and the fifth filter cavity F5 of the sixth branch 106, a coupling bandwidth between the fifth filter cavity F5 of the sixth filter branch 106 and the sixth filter cavity F86545 of the sixth filter branch 106, a coupling bandwidth between the fifth filter cavity F5 of the sixth filter branch 106 and the sixth filter cavity F8236 of the sixth filter branch 106, and the seventh filter cavity F7 of the sixth filter branch 106, The coupling bandwidth between the sixth filter cavity F6 of the sixth filter branch 106 and the seventh filter cavity F7 of the sixth filter branch 106, the coupling bandwidth between the seventh filter cavity F7 of the sixth filter branch 106 and the eighth filter cavity F8 of the sixth filter branch 106, and the coupling bandwidth between the eighth filter cavity F8 and the first port of the sixth filter branch 106 are respectively in the following ranges:

32Mhz-40Mhz、20Mhz-26Mhz、14Mhz-20Mhz、14Mhz-20Mhz、-11Mhz--8Mhz、16Mhz-22Mhz、15Mhz-21Mhz、-10Mhz--7Mhz、16Mhz-22Mhz、27Mhz-34Mhz、35Mhz-43Mhz。

therefore, the bandwidth of the sixth filtering branch 106 can be within 826-866MHz, which meets the design requirement.

Specifically, the filter 10 further includes: a fourth common chamber P4 disposed on the second side of the case 201; the seventh filtering branch 107 is arranged adjacent to the sixth filtering branch 106, is coupled with the fourth common cavity P4, and consists of eight filtering cavities which are sequentially coupled, wherein the eight filtering cavities form two seventh cross-coupling zeros; the eighth filtering branch 108 is arranged on the second side of the shell 201, is coupled with the fourth common cavity P4, and consists of eleven filtering cavities which are sequentially coupled, wherein the eleven filtering cavities form three eighth cross-coupling zeros;

preferably, in this embodiment, the seventh filtering branch 107 is a receiving filtering branch, and the eighth filtering branch 108 is a transmitting filtering branch. Of course, in other embodiments, the seventh filtering branch 107 may also be a transmitting filtering branch, and the eighth filtering branch 108 may also be a receiving filtering branch.

The second filtering chamber G2 of the seventh filtering branch 107 to the eighth filtering chamber G8 of the seventh filtering branch 107 are divided into two columns arranged along the second direction D2; the second filtering cavity G2, the fourth filtering cavity G2, the sixth filtering cavity G6 and the eighth filtering cavity G8 of the seventh filtering branch 107 are in a row and are sequentially arranged along the first direction D1; the fourth common cavity P4, the third filtering cavity G3 of the seventh filtering branch 107, the fifth filtering cavity G5 of the seventh filtering branch 107, and the seventh filtering cavity G7 of the seventh filtering branch 107 are in a row and are sequentially arranged along the first direction D1; an included angle between a connecting line of centers of the first filtering cavity G1 and the second filtering cavity G2 of the seventh filtering branch 107 and a connecting line of the second filtering cavity G2 and the fourth filtering cavity G4 of the seventh filtering branch 107 is an acute angle; the second filter cavity G2 of the seventh filter branch 107 is disposed adjacent to the first filter cavity F1 of the sixth filter branch 106, the third filter cavity G3 of the seventh filter branch 107 and the fourth common cavity P4, the second filter cavity G2 of the seventh filter branch 107 is disposed intersecting with the fourth filter cavity G4 and the first filter cavity G1 of the seventh filter branch 107, the sixth filter cavity G6 of the seventh filter branch 107 is disposed adjacent to the fifth filter cavity F5 of the sixth filter branch 106, the fifth filter cavity G5 of the seventh filter branch 107 and the seventh filter cavity G7 of the seventh filter branch, the sixth filter cavity G6 of the seventh filter branch 107 is disposed intersecting with the fourth filter cavity G4 and the eighth filter cavity G8 of the seventh filter branch 107, the eighth filter cavity G2 of the seventh filter branch 107 is disposed adjacent to the sixth filter cavity G7 of the sixth filter cavity G106 and the eighth filter cavity F7 of the seventh filter branch 106, and the eighth filter cavity G3 of the seventh filter branch 107 are disposed adjacent to the seventh filter cavity G7 of the seventh filter branch 106 and the seventh filter cavity G638, The seventh filtering cavities G7 are arranged in an intersecting way;

inductive cross coupling is respectively performed between the second filtering cavity G2 and the fourth filtering cavity G4 of the seventh filtering branch 107 and between the fifth filtering cavity G5 and the seventh filtering cavity G7 of the seventh filtering branch 107, so as to form two seventh cross-coupling zeros.

The cross-coupling manner of the seventh filtering branch 107 is the same as the cross-coupling manner of the sixth filtering branch 106, and therefore, the description thereof is omitted here.

The resonant frequencies of the first filtering cavity G1 through the eighth filtering cavity G8 of the seventh filtering branch 107 are the same as the resonant frequency ranges of the first filtering cavity F1 through the eighth filtering cavity F8 of the sixth filtering branch 106, and the coupling bandwidth ranges between the filtering cavities of the seventh filtering branch 107 are the same as the coupling bandwidth ranges between the filtering cavities of the sixth filtering branch 106, respectively. For example, the range of the coupling bandwidth between the second filter cavity G2 and the fourth filter cavity G4 of the seventh filter branch 107 is equal to the range of the coupling bandwidth between the second filter cavity F2 and the fourth filter cavity F4 of the sixth filter branch 106, and will not be described again.

Specifically, the second filtering cavity H2, the first filtering cavity H1, the fifth filtering cavity H5, the seventh filtering cavity H7 and the tenth filtering cavity H10 of the eighth filtering branch 108 are in a row and are sequentially arranged along the first direction D1; the third filtering cavity H3, the fourth filtering cavity H4, the eighth filtering cavity H8 and the ninth filtering cavity H9 of the eighth filtering branch 108 are in a row and are sequentially arranged along the first direction D1; the eleventh filtering cavity H11 of the eighth filtering branch 108 intersects with the tenth filtering cavity H10 of the eighth filtering branch 108, and is disposed adjacent to the seventh filtering cavity G7 of the seventh filtering branch 107 and the eighth filtering cavity H8 of the seventh filtering branch 107, and connecting lines of centers of the eleventh filtering cavity H11, the tenth filtering cavity H10 and the eighth filtering cavity H8 of the eighth filtering branch 108 are located on the same straight line; the first filter cavity H1 of the eighth filter branch 108 is respectively adjacent to the second filter cavity H2, the third filter cavity H3, the fourth filter cavity H4 and the fifth filter cavity H5 of the eighth filter branch 108, the seventh filter cavity H7 of the eighth filter branch 108 is respectively adjacent to the fifth filter cavity G5 of the seventh filter branch 107, the fifth filter cavity H5 of the eighth filter branch 108, the eighth filter cavity H8 of the eighth filter branch 108 and the tenth filter cavity H10 of the eighth filter branch 108, the sixth filter cavity H6 of the eighth filter branch 108 is respectively adjacent to the fifth filter cavity H5, the seventh filter cavity H7 and the eighth filter cavity H8 of the eighth filter branch 108, and is arranged at an interval with the fourth filter cavity H632 of the eighth filter branch 108, the fourth filter cavity H7378 of the eighth filter branch 108 is arranged adjacent to the eighth filter cavity H4 of the eighth filter branch 108, and the ninth filter cavity H4 of the eighth filter branch 108 is arranged at an interval with the ninth filter cavity H638 of the ninth filter cavity H4 of the eighth filter branch 108, and the ninth filter cavity H4 of the eighth filter branch 108, The tenth filter chamber H10 is adjacently disposed.

Inductive cross coupling is respectively performed between the fourth filtering cavity H4 and the sixth filtering cavity H6 of the eighth filtering branch 108, between the eighth filtering cavity H8 and the tenth filtering cavity H10 of the eighth filtering branch 108, and capacitive cross coupling is performed between the sixth filtering cavity H6 and the eighth filtering cavity H8 of the eighth filtering branch 108, so as to form three eighth cross coupling zeros.

The cross-coupling manner of the eighth filtering branch 108 is the same as the cross-coupling manner of the fifth filtering branch 105, and therefore, the description thereof is omitted here.

The resonant frequencies of the first filter cavity H1 through the eleventh filter cavity H11 of the eighth filter branch 108 are the same as the resonant frequency ranges of the first filter cavity E1 through the eleventh filter cavity E11 of the fifth filter branch 105, and the coupling bandwidth ranges between the filter cavities of the eighth filter branch 108 are the same as the coupling bandwidth ranges between the filter cavities of the fifth filter branch 105, respectively. For example, the range of the coupling bandwidth between the fourth filter cavity H4 and the sixth filter cavity H6 of the eighth filter branch 108 is equal to the range of the coupling bandwidth between the fourth filter cavity E4 and the sixth filter cavity E6 of the fifth filter branch 105.

The embodiment at least has the following beneficial effects: different from the prior art, on one hand, the filtering branches and the cavity body are regular and compact through the arrangement of the common cavity, the adjacent arrangement of the filtering branches and the adjacent arrangement of the filtering cavities, and the size of the filter is further reduced; on the other hand, zero point suppression is realized through the cross coupling zero point, and isolation among different filtering branches is improved.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating simulation results of the filter provided in the present application.

As shown in fig. 9, the bandwidths (see the frequency band 804) of the first filtering branch 101 and the fourth filtering branch 104 of this embodiment are within 919-; in this embodiment, the bandwidths (see the frequency band 803) of the second filtering branch 102 and the third filtering branch 103 are within 879-918MHz, and when the bandwidths of the second filtering branch 102 and the third filtering branch 103 of the filter 10 are 862MHz, the suppression is greater than 40dB, when the bandwidth of 870MHz, the suppression is greater than 20dB, when the bandwidth of 875MHz, the suppression is greater than 3dB, and when the bandwidth of 925MHz, the suppression is greater than 80 dB; in this embodiment, the bandwidths (see the frequency band 801) of the fifth filtering branch 105 and the eighth filtering branch 108 are located within 789-825MHz, and when the bandwidths of the fifth filtering branch 105 and the eighth filtering branch 108 of the filter 10 are 787MHz, the suppression is greater than 28dB, when the bandwidth of 788MHz, the suppression is greater than 22dB, when the bandwidth of 789MHz, the suppression is greater than 17dB, when the bandwidth of 789.5MHz, the suppression is greater than 10dB, when the bandwidth of 790MHz, the suppression is greater than 3.5dB, when the bandwidth of 832MHz, the suppression is greater than 105 dB; in this embodiment, the bandwidths (see the frequency band 802) of the sixth filtering branch 106 and the seventh filtering branch 107 are located in 826-866MHz, and the bandwidths of the sixth filtering branch 106 and the seventh filtering branch 106, 107 of the filter 10 are suppressed to be greater than 75dB when the bandwidth is 821MHz, and suppressed to be greater than 40dB when the bandwidth is 880 MHz. Good isolation can be achieved between the individual filter branches of the filter 10 of the present application.

The present application further provides a communication device, as shown in fig. 10, fig. 10 is a schematic diagram of an embodiment of the communication device of the present application.

As shown in fig. 10, the communication device 30 of this embodiment includes an antenna 32 and a Radio frequency unit 31, where the antenna 32 is connected to the Radio frequency unit 31, and the Radio frequency unit may be an rru (remote Radio unit). The rf unit 31 includes the filter 10 disclosed in the above embodiments, and is used for filtering the rf signal.

In other embodiments, the rf unit 31 may be integrated with the Antenna 32 to form an active Antenna unit (aau).

It should be noted that, some embodiments of the present application refer to the present invention as a filter, and may also be referred to as a combiner, that is, a dual-band combiner, and may also be referred to as a duplexer in other embodiments.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

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

a housing having a first direction and a second direction perpendicular to the first direction;

a first common cavity disposed on the housing first side;

the first filtering branch is arranged on the first side of the shell, is coupled with the first common cavity, and consists of ten filtering cavities which are sequentially coupled, wherein the ten filtering cavities of the first filtering branch form four first cross-coupling zero points;

the second filtering branch is arranged adjacent to the first filtering branch, coupled with the first common cavity and composed of eight filtering cavities which are sequentially coupled, and the eight filtering cavities of the second filtering branch form three second cross-coupling zero points;

the distance between the nth filter cavity and the (n + 1) th filter cavity of the first filter branch is equal to the distance between the (n + 1) th filter cavity and the (n + 2) th filter cavity of the first filter branch, and n is an integer which is greater than 0 and less than 9; the distance between the mth filter cavity and the (m + 1) th filter cavity of the second filter branch is equal to the distance between the (m + 1) th filter cavity and the (m + 2) th filter cavity of the first filter branch, and m is an integer which is greater than 0 and less than 7.

2. The filter of claim 1,

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

the third filtering cavity, the seventh filtering cavity and the ninth 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 sixth filtering cavity and the tenth filtering cavity of the first filtering branch are in a row, and the tenth filtering cavity, the sixth filtering cavity, the fifth filtering cavity and the fourth filtering cavity of the first filtering branch deviate from the middle dividing line of the shell in the second direction in sequence;

the first filtering cavity of the first filtering branch circuit is intersected with the first common cavity, and an included angle formed by a connecting line of centers of the first filtering cavity and the second filtering cavity of the first filtering branch circuit and a connecting line of centers of the first filtering cavity and the first common cavity of the first filtering branch circuit is an acute angle; the second filter cavity of the first filter branch is respectively intersected with the first filter cavity and the eighth filter cavity of the first filter branch, the second filter cavity of the first filter branch is respectively adjacent to the third filter cavity and the seventh filter cavity of the first filter branch, the seventh filter cavity of the first filter branch is respectively intersected with the third filter cavity and the ninth filter cavity of the first filter branch, the sixth filter cavity of the first filter branch is intersected with the fifth filter cavity and the tenth filter cavity of the first filter branch, the fifth filter cavity of the first filter branch is intersected with the third filter cavity of the first filter branch, and the fourth filter cavity of the first filter branch is adjacent to the third filter cavity and the fifth filter cavity of the first filter branch;

capacitive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the first filtering branch, between the third filtering cavity and the fifth filtering cavity of the first filtering branch, and between the seventh filtering cavity and the ninth filtering cavity of the first filtering branch, and inductive cross coupling is performed between the sixth filtering cavity and the ninth filtering cavity of the first filtering branch, so that four first cross coupling zeros are formed.

3. The filter of claim 2,

the first filtering cavity, the second filtering cavity and the third filtering cavity of the second filtering branch circuit are arranged in a triangular mode;

the fourth filtering cavity, the fifth filtering cavity, the sixth filtering cavity and the seventh filtering cavity of the second filtering branch are arranged in a quadrilateral manner, and the fourth filtering cavity and the sixth filtering cavity of the second filtering branch are arranged in a diagonal manner;

the first filtering cavity of the second filtering branch is intersected with the first common cavity, the first filtering cavity and the third filtering cavity of the second filtering branch are arranged at intervals, and connecting lines of centers of the common cavity, the first filtering cavity of the second filtering branch and the third filtering cavity of the second filtering branch are positioned on the same straight line; the second filter cavity of the second filter branch is respectively adjacent to the first filter cavity and the third filter cavity of the second filter branch, and the first filter cavity and the third filter cavity of the second filter branch are respectively adjacent to the fourth filter cavity of the first filter branch; the projection of the center of the third filter cavity of the second filter branch in the first direction is located between the projections of the centers of the first filter cavity and the second filter cavity of the second filter branch in the first direction, and the projection of the center of the second filter cavity of the second filter branch in the second direction is located between the projections of the centers of the first filter cavity and the third filter cavity of the second filter branch in the second direction;

the fourth filter cavity of the second filter branch is intersected with the third filter cavity, the fifth filter cavity and the sixth filter cavity of the second filter branch respectively, the fourth filter cavity and the seventh filter cavity of the second filter branch are arranged at intervals, the sixth filter cavity of the second filter branch is intersected with the fifth filter cavity of the second filter branch, the seventh filter cavity of the second filter branch is adjacent to the eighth filter cavity of the second filter branch and the sixth filter cavity of the second filter branch respectively, and an included angle between a connecting line of centers of the seventh filter cavity and the eighth filter cavity of the second filter branch and a midline of the shell in the second direction is an acute angle;

and the first filtering cavity and the third filtering cavity of the second filtering branch, the fourth filtering cavity and the sixth filtering cavity of the second filtering branch, and the fourth filtering cavity and the seventh filtering cavity of the second filtering branch are in inductive cross coupling respectively to form three second cross coupling zeros.

4. The filter of claim 1, further comprising:

a second common cavity disposed on the housing first side;

the third filtering branch is arranged adjacent to the second filtering branch, coupled with the second common cavity and composed of eight filtering cavities which are sequentially coupled, and the eight filtering cavities of the third filtering branch form three third cross-coupling zero points;

the fourth filtering branch is arranged adjacent to the third filtering branch, coupled with the second common cavity and composed of ten filtering cavities which are sequentially coupled, and the ten filtering cavities of the fourth filtering branch form four fourth cross-coupling zeros;

the eight filter cavities of the third filter branch circuit are divided into four rows arranged along the second direction;

the sixth filtering cavities and the eighth filtering cavities of the third filtering branch are in a row and are sequentially arranged along the first direction;

the fifth filtering cavities and the seventh filtering cavities of the third filtering branch are in a row and are sequentially arranged along the first direction;

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

the first filtering cavities and the third filtering cavities of the third filtering branch are in a row and are sequentially arranged along the first direction;

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

and the first filtering cavity and the third filtering cavity of the third filtering branch, the fourth filtering cavity and the seventh filtering cavity of the third filtering branch, and the fifth filtering cavity and the seventh filtering cavity of the third filtering branch are in inductive cross coupling respectively to form three third cross coupling zeros.

5. The filter of claim 4,

ten filter cavities of the fourth filter branch are divided into four rows arranged along the second direction;

the seventh filtering cavities and the eighth filtering cavities of the fourth filtering branch are in a row and are sequentially arranged along the first direction;

the sixth filtering cavities and the ninth filtering cavities of the fourth filtering branch are in a row and are sequentially arranged along the first direction;

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

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

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

capacitive cross coupling is respectively performed between the first filtering cavity and the third filtering cavity of the fourth filtering branch, between the third filtering cavity and the fifth filtering cavity of the fourth filtering branch, and between the seventh filtering cavity and the ninth filtering cavity of the fourth filtering branch, and inductive cross coupling is performed between the sixth filtering cavity and the ninth filtering cavity of the fourth filtering branch, so that four fourth cross coupling zeros are formed.

6. The filter of claim 1, further comprising:

a third common cavity disposed on the housing second side;

the fifth filtering branch is arranged on the second side of the shell, is coupled with the third common cavity, and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the fifth filtering branch form three fifth cross-coupling zeros;

the sixth filtering branch is arranged adjacent to the fifth filtering branch, is coupled with the third common cavity, and consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities of the sixth filtering branch form two sixth cross-coupling zeros;

the first filtering cavity to the eighth filtering cavity of the fifth filtering branch are divided into two rows which are adjacently arranged along the second direction;

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

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

the ninth filtering cavity, the tenth filtering cavity and the eleventh filtering cavity of the fifth filtering branch circuit are arranged in a triangular shape;

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

the first filter cavity of the fifth filter branch is intersected with the fourth filter cavity of the fifth filter branch, the first filter cavity of the fifth filter branch is respectively adjacent to the fifth filter cavity, the third filter cavity and the second filter cavity of the fifth filter branch, the seventh filter cavity of the fifth filter branch is respectively adjacent to the fifth filter cavity, the sixth filter cavity and the eighth filter cavity of the fifth filter branch, the sixth filter cavity of the fifth filter branch is adjacent to the eighth filter cavity of the fifth filter branch, the sixth filter cavity of the fifth filter branch is spaced from the fourth filter cavity of the fifth filter branch, and the fourth filter cavity of the fifth filter branch is intersected with the third filter cavity of the fifth filter branch;

the ninth filter cavity and the eleventh filter cavity of the fifth filter branch are sequentially arranged at intervals along the second direction, the projection of the center of the tenth filter cavity of the fifth filter branch in the second direction is located between the center of the ninth filter cavity of the fifth filter branch and the projection of the center of the eleventh filter cavity of the fifth filter branch in the second direction, and the tenth filter cavity of the fifth filter branch is respectively intersected with the ninth filter cavity and the eleventh filter cavity of the fifth filter branch;

and the fourth filtering cavity and the sixth filtering cavity of the fifth filtering branch circuit and the eighth filtering cavity and the tenth filtering cavity of the fifth filtering branch circuit are in inductive cross coupling respectively, and the sixth filtering cavity and the eighth filtering cavity of the fifth filtering branch circuit are in capacitive cross coupling to form three fifth cross coupling zeros.

7. The filter of claim 6,

the first filtering cavity to the seventh filtering cavity of the sixth filtering branch are divided into two rows which are adjacently arranged along the second direction;

the third common cavity, the second filter cavity of the sixth filter branch, the fourth filter cavity of the sixth filter branch and the sixth filter cavity of the sixth filter branch are in a row and are sequentially arranged along the first direction;

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

an included angle between a connecting line of centers of the eighth filtering cavity and the seventh filtering cavity of the sixth filtering branch and a connecting line of centers of the fifth filtering cavity and the seventh filtering cavity of the sixth filtering branch is an acute angle;

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

and inductive cross coupling is respectively performed between the second filtering cavity and the fourth filtering cavity of the sixth filtering branch and between the fifth filtering cavity and the seventh filtering cavity of the sixth filtering branch so as to form two sixth cross coupling zeros.

8. The filter of claim 6, further comprising:

a fourth common cavity disposed on the housing second side;

the seventh filtering branch is arranged adjacent to the sixth filtering branch, is coupled with the fourth common cavity, and consists of eight filtering cavities which are sequentially coupled, and the eight filtering cavities of the seventh filtering branch form two seventh cross-coupling zeros;

the eighth filtering branch is arranged on the second side of the shell, is coupled with the fourth common cavity, and consists of eleven filtering cavities which are sequentially coupled, wherein eleven filtering cavities of the eighth filtering branch form three eighth cross-coupling zeros;

the second filtering cavity of the seventh filtering branch to the eighth filtering branch of the seventh filtering branch are divided into two rows arranged along the second direction;

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

the fourth common cavity, the third filter cavity of the seventh filter branch, the fifth filter cavity of the seventh filter branch and the seventh filter cavity of the seventh filter branch are in a row and are sequentially arranged along the first direction;

an included angle between a connecting line of centers of the first filtering cavity and the second filtering cavity of the seventh filtering branch and a connecting line of centers of the second filtering cavity and the fourth filtering cavity of the seventh filtering branch is an acute angle;

the second filter cavity of the seventh filter branch is respectively adjacent to the first filter cavity of the sixth filter branch, the third filter cavity of the seventh filter branch and the fourth common cavity, the second filter cavity of the seventh filter branch is respectively intersected with the fourth filter cavity and the first filter cavity of the seventh filter branch, the sixth filter cavity of the seventh filter branch is respectively adjacent to the fifth filter cavity of the sixth filter branch, the fifth filter cavity of the seventh filter branch and the seventh common cavity of the seventh filter branch, the sixth filter cavity of the seventh filter branch is intersected with the fourth filter cavity and the eighth filter cavity of the seventh filter branch, the eighth filter cavity of the seventh filter branch is respectively adjacent to the seventh filter cavity and the eighth filter cavity of the sixth filter branch, and the fifth filter cavity of the seventh filter branch is respectively intersected with the third filter cavity of the seventh filter branch, The seventh filtering cavities are arranged in an intersecting manner;

and inductive cross coupling is respectively performed between the second filtering cavity and the fourth filtering cavity of the seventh filtering branch and between the fifth filtering cavity and the seventh filtering cavity of the seventh filtering branch so as to form two seventh cross coupling zeros.

9. The filter of claim 8,

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

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

the eleventh filter cavity of the eighth filter branch is intersected with the tenth filter cavity of the eighth filter branch, and is arranged adjacent to the seventh filter cavity of the seventh filter branch and the eighth filter cavity of the seventh filter branch, and connecting lines of centers of the eleventh filter cavity, the tenth filter cavity and the eighth filter cavity of the eighth filter branch are positioned on the same straight line;

the first filter cavity of the eighth filter branch is respectively adjacent to the second filter cavity, the third filter cavity, the fourth filter cavity and the fifth filter cavity of the eighth filter branch, the seventh filter cavity of the eighth filter branch is respectively adjacent to the fifth filter cavity of the seventh filter branch, the fifth filter cavity of the eighth filter branch, the eighth filter cavity of the eighth filter branch and the tenth filter cavity of the eighth filter branch, the sixth filter cavity of the eighth filter branch is respectively intersected with the fifth filter cavity, the seventh filter cavity and the eighth filter cavity of the eighth filter branch and is spaced from the fourth filter cavity of the eighth filter branch, the fourth filter cavity of the eighth filter branch is adjacent to the third filter cavity of the eighth filter branch, the ninth filter cavity of the eighth filter branch is respectively adjacent to the eighth filter cavity of the eighth filter branch, The tenth filtering cavity is arranged adjacently;

and the fourth filtering cavity and the sixth filtering cavity of the eighth filtering branch, the eighth filtering cavity and the tenth filtering cavity of the eighth filtering branch are inductively cross-coupled, and the sixth filtering cavity and the eighth filtering cavity of the eighth filtering branch are capacitively cross-coupled to form three eighth cross-coupling zeros.

10. A communication device comprising an antenna and a radio frequency unit, the antenna being connected to the radio frequency unit, the radio frequency unit comprising a filter according to any one of claims 1 to 9 for filtering radio frequency signals.