CN113054361A

CN113054361A - Filter and communication equipment

Info

Publication number: CN113054361A
Application number: CN201911381095.5A
Authority: CN
Inventors: 钟志波; 温世议; 韩军平; 龚爱强
Original assignee: Shenzhen Tatfook Technology Co Ltd
Current assignee: Shenzhen Tatfook Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The application discloses 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 chamber disposed on the housing; the first filtering branch is arranged on the shell, is coupled with the first common cavity, consists of eleven filtering cavities which are sequentially coupled, and forms four first cross coupling zeros; the second filtering branch circuit is arranged adjacent to the first filtering branch circuit along the first direction, is coupled with the first common cavity, consists of nine filtering cavities which are sequentially coupled, and forms three second inductive cross-coupling zero points; the first filtering branches are arranged in a broken line shape, the second filtering branches are arranged in a U shape, and the first common cavity is arranged between the first filtering branches and the second filtering branches. Therefore, the volume of the filter can be reduced by the arrangement of the common cavity, the adjacent arrangement of the filtering branches, the fold line arrangement and the U-shaped arrangement; and zero point suppression can be realized through the cross coupling zero point, and the isolation among different filtering branches is improved.

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 the bandwidth of the signal. 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 different filter branches are not adjacently arranged and do not have a common cavity, so that the problem that the size of the existing filter is too large is caused, and particularly when a plurality of filter branches are involved, the problem is particularly serious; 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 chamber disposed on the housing; the first filtering branch is arranged on the shell, is coupled with the first common cavity and consists of eleven filtering cavities which are sequentially coupled, and the eleven 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 along the first direction, is coupled with the first common cavity and consists of nine filtering cavities which are sequentially coupled, and the nine filtering cavities of the second filtering branch form three second inductive cross-coupling zero points; eleven filtering cavities of the first filtering branch circuit are arranged in a broken line shape, nine filtering cavities of the second filtering branch circuit are arranged in a U shape, and the first common cavity is arranged between the first filtering branch circuit and the second filtering branch circuit. Therefore, the number of taps and welding points can be reduced by arranging the common cavity, and the size of the filter is further reduced; the filter branches can be compactly arranged by adjacent arrangement of the filter branches, so that the size of the filter is reduced; the arrangement shape of the filter cavities of the first filter branch is in a broken line shape, so that the length of the shell of the filter in the first direction is reduced, and the problem that the length of the shell in the first direction is too long when a plurality of filter branches are arranged along the first direction is avoided; the second filtering branch road is the U type setting on the whole, and its is rationally distributed, has also make full use of the space of casing in the second direction when reducing the length of casing in the first direction, and broken line type is arranged simultaneously and is arranged and make full use of the casing space with the U type, has reduced the volume of wave filter. And zero point suppression can be realized through the cross coupling zero point, and the isolation among different filtering branches is improved.

The embodiment of the application at least has the following beneficial effects: different from the prior art, on one hand, the arrangement of taps and welding points is reduced through the arrangement of the common cavity and the adjacent arrangement of the filtering branches, the arrangement of the filtering branches is relatively compact, the size of the filter can be further reduced, the size of the first common cavity is equal to that of the filtering cavity of the second filtering branch, and the design and the manufacture are convenient; on the other hand, zero point suppression is realized through the cross coupling zero point formed by the first filtering branch and the second filtering branch, 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 filter cavity intersection of a filter provided herein;

fig. 4 is a schematic diagram of a topology of a second filtering branch of the filter provided in the present application;

FIG. 5 is a schematic diagram of a second embodiment of a filter provided herein;

fig. 6 is a schematic diagram of a topology of a third filtering branch of the filter provided in the present application;

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

fig. 8 is a schematic structural diagram of a third embodiment 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: a housing 210 having a first direction D1 and a second direction D2 perpendicular to the first direction D1; a first common chamber P1 provided on the case 210; the first filtering branch 101 is arranged on the shell 210, is coupled with the first common cavity P1 and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the first filtering branch 101 form four first cross-coupling zeros; the second filtering branch 102 is arranged adjacent to the first filtering branch 101 along the first direction D1, is coupled with the first common cavity P1, and consists of nine filtering cavities coupled in sequence, and the nine filtering cavities of the second filtering branch 102 form three second inductive cross-coupling zeros; eleven filtering cavities of the first filtering branch circuit are arranged in a broken line shape, nine filtering cavities of the second filtering branch circuit are arranged in a U shape, and the first common cavity is arranged between the first filtering branch circuit and the second filtering branch circuit.

Preferably, in this embodiment, the size of the first common cavity P1 is equal to the size of the filter cavity of the second filter branch 102 and smaller than the size of the filter cavity of the first filter branch 101.

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.

Preferably, in this embodiment, all the filter cavities of the first filter branch 101 have the same size, all the filter cavities of the second filter branch 102 have the same size, and the size of the filter cavity of the second filter branch 102 is smaller than that of the filter cavity of the first filter branch 101. Of course, in some other embodiments, in order to meet the actual requirement, the sizes of all the filter cavities of the first and second filter branches may not be equal, and in the case of being equal, the size of the filter cavity of the first filter branch 101 may also be smaller than the size of the filter cavity of the second filter branch 102.

It should be noted that, in the present embodiment, the size of the first common cavity P1 is equal to the size of the filter cavity of the second filter branch 102. Specifically, when the sizes of the filter cavities of the second filter branches 102 are equal, the size of the first common cavity P1 is equal to that of any one of the filter cavities of the second filter branch 102; when the sizes of the filter cavities of the second filter branch 102 are not equal, the size of the first common cavity P1 is equal to the size of the first filter cavity of the second filter branch 102. In this way, the first common cavity P1 can be formed integrally with the filter cavity of the second filter branch 102, which can reduce the number of processes and save the cost.

The first filtering branch 101 and the second filtering branch 102 are sequentially arranged along the first direction D1, so that the structure of the filter 10 is compact and the size of the filter 10 can be reduced.

It is worth mentioning that: the coupling zero point is also called as transmission zero point, so that zero point suppression can be realized, and the debugging index is convenient. The transmission zero is the transmission function of the filter 10 equal to zero, that is, the electromagnetic energy at the frequency point corresponding to the transmission zero cannot pass through the network, so that the complete isolation effect is achieved, the suppression effect on the signals outside the passband is achieved, and the high isolation among a plurality of passbands can be better achieved.

Therefore, the high isolation between the first filtering branch and the second filtering branch can be realized through the cross coupling zero point formed by the first filtering branch and the second filtering branch.

Further, it is to be further explained that: the parameters (such as 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. The twelve filter cavities of the first filter branch 101 are specifically the first filter cavity a1 to the twelfth filter cavity of the first filter branch 101.

As shown in fig. 1, in particular, the eleven filter cavities of the first filter branch 101 are divided into seven rows arranged along the first direction D1; the eleventh filtering cavities a11 of the first filtering branch 101 are in one row; the tenth filtering cavity a10 and the eighth filtering cavity A8 of the first filtering branch 101 are in a row and are sequentially arranged along the second direction D2; the ninth filtering cavity a9 and the seventh filtering cavity a7 of the first filtering branch 101 are in a row and are sequentially arranged along the second direction D2; the fifth filtering cavity a5 and the sixth filtering cavity a6 of the first filtering branch 101 are in a row and are sequentially arranged along the second direction D2; the fourth filtering cavities a4 of the first filtering branch 101 are in one row; the third filtering cavity A3 and the second filtering cavity a2 of the first filtering branch 101 are in a row and are sequentially arranged along the second direction D2; the first filtering cavities a1 of the first filtering branch 101 are in a row; an eleventh filter cavity a11 of the first filter branch 101 is respectively adjacent to a tenth filter cavity a10 and an eighth filter cavity a8 of the first filter branch 101, a ninth filter cavity a9 of the first filter branch 101 is respectively adjacent to a tenth filter cavity a10, an eighth filter cavity a8, a seventh filter cavity A7, a fifth filter cavity A5 and a sixth filter cavity A6 of the first filter branch 101, a fourth filter cavity A4 of the first filter branch 101 is respectively adjacent to a fifth filter cavity A5, a sixth filter cavity A6, a third filter cavity A3 and a second filter cavity a2 of the first filter branch 101, a first filter cavity a1 and a second filter cavity a2 of the first filter branch 101 are respectively adjacent to each other, a first filter cavity a1 and a second filter cavity a2 of the first filter branch 101 are respectively adjacent to each other, a central line of the first filter cavity a2 and a2 of the first filter branch 101 are respectively located on a central line of the first filter branch 101, and a central line of the second filter branch is located at an acute angle of the central line of the central filter cavity a2 a2 of the first filter cavity a 4623, and the central filter cavity of the first filter branch 101, the first filter branch 101 and the central line of the central filter cavity of the central filter branch 101 is located at the central line The centers of the second filter cavity a2 and the fourth filter cavity a4 of the path 101 are between the projections in the second direction D2.

The twelve filter cavities of the first filter branch 101 are divided into seven rows arranged along the first direction D1, so that the gap between the filter cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. Moreover, the overall arrangement shape of the filter is a broken line shape, so that the length of the housing of the filter 10 in the first direction D1 is reduced, and the problem that the length of the housing 210 in the first direction D1 is too long when a plurality of filter branches are arranged along the first direction D1 is avoided. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a topology of a first filtering branch 101 of the filter 10 according to the present application.

As shown in fig. 2, capacitive cross coupling is respectively performed between the second filter cavity a2 and the fourth filter cavity a4 of the first filter branch 101, between the seventh filter cavity a7 and the ninth filter cavity a9 of the first filter branch 101, between the fourth filter cavity a4 and the sixth filter cavity a6 of the first filter branch 101, and 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.

More specifically, the capacitive cross-coupling zero is implemented by a capacitive cross-coupling element, and a typical capacitive cross-coupling element may be a flying bar. That is, flying rods are respectively disposed between the second filtering cavity a2 and the fourth filtering cavity a4 of the first filtering branch 101, and between the seventh filtering cavity a7 and the ninth filtering cavity a9 of the first filtering branch 101, so that the second filtering cavity a2 and the fourth filtering cavity a4 of the first filtering branch 101, and the seventh filtering cavity a7 and the ninth filtering cavity a9 of the first filtering branch 101 are respectively capacitively and cross-coupled, and are respectively equivalent to C1 and C2 shown in fig. 2.

More specifically, windows may be respectively disposed between the fourth filter cavity a4 and the sixth filter cavity a6 of the first filter branch 101, between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 101, and metal coupling ribs are disposed on the windows, so that inductive cross coupling is respectively achieved between the fourth filter cavity a4 and the sixth filter cavity a6 of the first filter branch 101, and between the sixth filter cavity a6 and the ninth filter cavity a9 of the first filter branch 101, so as to respectively form inductive cross coupling zeros, which are respectively equivalent to the inductors L1 and L2 shown in fig. 2.

The inductive cross coupling is realized by the metal coupling rib, and the metal coupling rib is slightly changed by the external temperature so as to prevent the filter 10 from generating temperature drift.

Further, the filter 10 further comprises a first port (not shown) coupled to the eleventh filter cavity a11 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 eleventh filter cavity a11 of the first filter branch 101 are sequentially in the following ranges:

1839Mhz-1841Mhz、1839Mhz-1841Mhz、1822Mhz-1824Mhz、1840Mhz-1842Mhz、1852Mhz-1854Mhz、1840Mhz-1842Mhz、1836Mhz-1838Mhz、1811Mhz-1813Mhz、1839Mhz-1841Mhz、1839Mhz-1841Mhz、1839Mhz-1841Mhz。

a coupling bandwidth between the first common cavity P1 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 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 fourth filter cavity A4 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 branch 101, a coupling bandwidth between the fourth filter cavity A4 of the first filter branch 101 and the sixth filter cavity a 86545 of the first filter branch 101, a coupling bandwidth between the fourth filter cavity A4 of the first filter branch 101 and the sixth filter cavity A6 of the first filter branch 101, and a 8236 of the first filter cavity a 8236, A 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, a 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, a coupling bandwidth between the seventh filter cavity a7 of the first filter branch 101 and the eighth filter cavity A8 of the first filter branch 101, a 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, a 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, a 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, a coupling bandwidth between the tenth filter cavity a10 of the first filter branch 101 and the eleventh filter cavity a11 of the first filter branch 101, The coupling bandwidths between the eleventh filter cavity a11 of the first filter branch 101 and the first port are respectively in the following ranges:

73Mhz-85Mhz、58Mhz-69Mhz、37Mhz-45Mhz、-19Mhz--17Mhz、33Mhz-41Mhz、34Mhz-42Mhz、35Mhz-43Mhz、3Mhz-8Mhz、21Mhz-28Mhz、-28Mhz--27Mhz、27Mhz-34Mhz、40Mhz-49Mhz、58Mhz-69Mhz、73Mhz-85Mhz。

therefore, the bandwidth of the first filtering branch 101 can be made to be within 1800-1882MHz, and the design requirement is met.

The nine filter cavities of the second filter branch 102 are specifically the first filter cavity B1 through the ninth filter cavity B9 of the second filter branch 102.

As shown in fig. 1, in particular, the first common cavity P1 and the nine filter cavities of the second filter branch 102 are divided into two columns arranged along the second direction D2; the first common cavity P1 and the first filter cavity B1, the second filter cavity B2 and the third filter cavity B3 of the second filter branch 102 are in a row and are sequentially arranged along the first direction D1; the eighth filtering cavity B8, the seventh filtering cavity B7, the sixth filtering cavity B6, the fifth filtering cavity B5 and the fourth filtering cavity B4 of the second filtering branch 102 are in a row and are sequentially arranged along the first direction D1; the first common cavity P1 and the first filter cavity B1, the second filter cavity B2 and the third filter cavity B3 of the second filter branch 102 are sequentially arranged in an intersecting manner; the eighth filtering cavity B8, the seventh filtering cavity B7, the sixth filtering cavity B6, the fifth filtering cavity B5 and the fourth filtering cavity B4 of the second filtering branch 102 are sequentially intersected; the intersection degrees of the intersection arrangement are equal; the first filter cavity B1 of the second filter branch 102 is respectively adjacent to the seventh filter cavity B7 and the sixth filter cavity B6 of the second filter branch 102.

The nine filter cavities of the first common cavity P1 and the second filter branch 102 are divided into two columns arranged along the second direction D2, so that the gap between the filter cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. The second filter branch 102 is U-shaped as a whole, and the layout is reasonable, so that the length of the housing in the first direction D1 is reduced, and the space of the housing in the second direction D2 is fully utilized. And, first public chamber sets up between the first filter chamber A1 of first filter branch road 101 and the first filter chamber B1 of second filter branch road 102, and then separates first, two filter branch roads and arranges, has not only accomplished reasonable layout, has also reduced the interference of the channel signal between first, two filter branch roads, has promoted the isolation. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10. The crossing arrangement of the filter wave cavities can avoid the traditional filter 10 from arranging a separation wall between the mutually coupled filter cavities and arranging a window on the separation wall, thereby being convenient for manufacturing, saving materials and further reducing the manufacturing cost, reducing the total volume occupied by the filter cavities and further reducing the volume of the filter 10.

Referring to fig. 3, fig. 3 is a schematic diagram of filter cavity intersection.

The above described intersection equality is now explained with reference to fig. 3: as shown in fig. 3, the sizes of the cavity 1 and the cavity 2 of the filter cavity are the same, the cavity 1 and the cavity 2 are arranged in an intersecting manner, the housing of the cavity 1 and the housing of the cavity 2 intersect to form intersection points a and B, and line segments formed by the intersection points a and B are called intersection lines. In the present application, the length of the intersection line is used to indicate the degree of intersection, i.e. if the length of the intersection line formed between two pairs of cavities is equal, the degree of intersection between the two pairs of cavities is equal.

And in combination with the overall arrangement mode of the first and second filtering branches, the first and second filtering branches are arranged in the first direction D1 as a whole, and have a small width in the second direction D2, so that the formed filter 10 is similar to a rectangle with a small width in appearance, and can meet specific practical installation requirements.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a topology of the second filtering branch 102 of the filter 10 according to the present application.

As shown in fig. 2, inductive cross-coupling is performed between the second filter cavity B2 and the fifth filter cavity B5 of the second filter branch 102, between the second filter cavity B2 and the sixth filter cavity B6 of the second filter branch 102, and between the third filter cavity B3 and the fifth filter cavity B5 of the second filter branch 102, respectively, so as to form three second inductive cross-coupling zeros.

More specifically, windows may be respectively disposed between the second filter cavity B2 and the fifth filter cavity B5 of the second filter branch 102, between the second filter cavity B2 and the sixth filter cavity B6 of the second filter branch 102, and between the third filter cavity B3 and the fifth filter cavity B5 of the second filter branch 102, and metal coupling ribs are disposed on the windows, so that inductive cross coupling is respectively achieved between the second filter cavity B2 and the fifth filter cavity B5 of the second filter branch 102, between the second filter cavity B2 and the sixth filter cavity B6 of the second filter branch 102, and between the third filter cavity B3 and the fifth filter cavity B5 of the second filter branch 102, so as to respectively form inductive cross coupling zeros, which are respectively equivalent to the inductances L1, L2, and L3 shown in fig. 2.

Moreover, the cross-coupling zeros of the second filtering branch 102 are all inductive coupling zeros, which have good material consistency and are convenient to manufacture, and the stability of the filter 10 can be improved.

Further, the filter 10 further comprises a first port (not shown) coupled to the ninth filter cavity B9 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 ninth filter cavity B9 of the second filter branch 102 are sequentially in the following ranges:

1746Mhz-1748Mhz、1745Mhz-1748Mhz、1762Mhz-1764Mhz、1783Mhz-1785Mhz、1746Mhz-1748Mhz、1745Mhz-1747Mhz、1746Mhz-1748Mhz、1746Mhz-1748Mhz、1746Mhz-1748Mhz。

a coupling bandwidth between the first common cavity P1 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 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 second filter cavity B2 of the second filter branch 102 and the fifth filter cavity B5 of the second filter branch 102, a coupling bandwidth between the second filter cavity B2 of the second filter branch 102 and the sixth filter cavity B6 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 third filter cavity B3 of the second filter branch 102 and the fifth filter cavity B86545 of the second filter branch 102, a coupling bandwidth between the third filter cavity B3 of the second filter branch 102 and the fifth filter cavity B5 of the second filter branch 102, and the fourth filter cavity B5 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 102 and the eighth filter cavity B8 of the second filter branch 102, the coupling bandwidth between the eighth filter cavity B8 of the second filter branch 102 and the ninth filter cavity B9 of the second filter branch 102, and the coupling bandwidth between the ninth filter cavity B9 of the second filter branch 102 and the first port are respectively in the following ranges:

76Mhz-89Mhz、61Mhz-72Mhz、37Mhz-46Mhz、16Mhz-22Mhz、1Mhz-5Mhz、11Mhz-16Mhz、27Mhz-34Mhz、17Mhz-23Mhz、38Mhz-47Mhz、38Mhz-47Mhz、42Mhz-51Mhz、61Mhz-72Mhz、76Mhz-89Mhz。

therefore, the bandwidth of the second filtering branch 102 can be within 1706-1790MHz, and the design requirement is met.

The embodiment at least has the following beneficial effects: be different from prior art, on the one hand through the setting of public chamber reduced tap and welding point setting to through adjacent setting, broken line arrangement, the U type between the filtering branch road arrange make the relatively compact of arranging of filtering branch road, and then can reduce filter 10's volume. On the other hand, zero point suppression is realized through the cross coupling zero point formed by the first filtering branch and the second filtering branch, and isolation among different filtering branches can be improved.

Please refer to fig. 5, which is a schematic structural diagram of a filter 10 according to a second embodiment of the present application.

As shown in fig. 5, in particular, the second common chamber P2 is disposed on the housing 210; the third filtering branch 103 is sequentially and adjacently arranged with the first filtering branch 101 along the second direction D2, coupled with the second common cavity P2 and composed of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the third filtering branch 103 form four third cross-coupling zeros; and the fourth filtering branch 104 and the second filtering branch 102 are sequentially and adjacently arranged along the second direction D2, are coupled with the second common cavity P2, and are composed of nine filtering cavities that are sequentially coupled, and the nine filtering cavities of the fourth filtering branch 104 form three fourth inductive cross-coupling zeros.

Preferably, in this embodiment, all the filter cavities of the third filter branch 103 have equal sizes, all the filter cavities of the fourth filter branch 104 have equal sizes, the filter cavity of the third filter branch 103 has equal size to the filter cavity of the first filter branch 101, the filter cavity of the fourth filter branch 104 has equal size to the filter cavity of the second filter branch 102, and the size of the second common cavity P2 is equal to the filter cavity of the fourth filter branch 104.

The third filtering branch 103 and the fourth filtering branch 104 are both coupled to the second common cavity P2 and are respectively disposed adjacent to the first filtering branch and the second filtering branch, so that the size of the filter 10 can be reduced.

Eleven filter cavities of the third filter branch 103 are divided into five rows arranged along the first direction D1; the eleventh filtering cavities C11 of the third filtering branch 103 are in one row; the tenth filter cavity C10 and the ninth filter cavity C9 of the third filter branch 103 are in a row and are sequentially arranged along the second direction D2; the eighth filter cavity C8 and the seventh filter cavity C7 of the third filter branch 103 are in a row and are sequentially arranged along the second direction D2; the fifth filter cavity C5 and the sixth filter cavity C6 of the third filter branch 103 are in a row and are sequentially arranged along the second direction D2; the fourth filtering cavity C4 and the third filtering cavity C3 of the third filtering branch 103 are in a row and are sequentially arranged along the second direction D2; the second filtering cavity C2 and the first filtering cavity C1 of the third filtering branch 103 are in a row and are sequentially arranged along the second direction D2; an eleventh filter cavity C11 of the third filter branch 103 is respectively disposed adjacent to a tenth filter cavity C10 and a ninth filter cavity C9 of the third filter branch 103, an eighth filter cavity C8 of the third filter branch 103 is respectively disposed adjacent to a tenth filter cavity C10, a ninth filter cavity C9, a seventh filter cavity C7, a fifth filter cavity C5 and a sixth filter cavity C6 of the third filter branch 103, an eighth filter cavity C8 of the third filter branch 103 is disposed adjacent to a seventh filter cavity a7 of the first filter branch 101, a connecting line of a center of the eighth filter cavity C8 of the third filter branch 103 and a center of the seventh filter cavity a7 of the first filter branch 101, a center of the ninth filter cavity a9 of the first branch 101 is located on the same straight line, a third filter cavity C3 of the third filter branch 103 is respectively disposed adjacent to a sixth filter cavity C5, a fourth filter cavity C5, a sixth filter cavity C5 of the third filter branch 103, a sixth filter cavity C638 and a sixth filter cavity C5 of the third filter cavity 103, The first filtering cavities C1 are adjacently arranged, the second filtering cavity C2 of the third filtering branch 103 is adjacently arranged with the ninth filtering cavity C9 of the second filtering branch 102, the first filtering cavity C1 and the second common cavity P2 of the third filtering branch 103 are arranged at intervals, and an included angle between a connecting line of the center of the second common cavity and the center of the third filtering branch 103 and a connecting line of the center of the first filtering cavity C1 and the center of the second filter 10 of the third filtering branch 103 is an obtuse angle.

Eleven filter cavities of the third filter branch 103 are divided into five rows arranged along the first direction D1, so that the gap between the filter cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. And the third filtering branch 103 is arranged in a broken line similar to the first filtering branch 101, and has the same beneficial effect as the broken line arrangement of the first filtering branch 101, which is not described herein again. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10.

Referring to fig. 6, fig. 6 is a schematic diagram of a topology of a third filtering branch 103 of the filter 10 according to the present application.

As shown in fig. 6, capacitive cross coupling is respectively performed between the third filter cavity C3 and the fifth filter cavity C5 of the third filter branch 103, between the eighth filter cavity C8 and the tenth filter cavity C10 of the third filter branch 103, between the third filter cavity C3 and the sixth filter cavity C6 of the third filter branch 103, and between the sixth filter cavity C6 and the eighth filter cavity C8 of the third filter branch 103, so as to form four third cross coupling zeros.

More specifically, capacitive cross coupling zero points are formed between the third filter cavity C3 and the fifth filter cavity C5 of the third filter branch 103, between the eighth filter cavity C8 and the tenth filter cavity C10 of the third filter branch 103 through flying rods, and inductive cross coupling is realized by opening windows and arranging metal coupling ribs between the third filter cavity C3 and the sixth filter cavity C6 of the third filter branch 103 and between the sixth filter cavity C6 and the eighth filter cavity C8 of the third filter branch 103. For details, see the above description, and are not described herein again.

Further, the filter 10 further comprises a first port (not shown) coupled to the eleventh filter cavity C11 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 eleventh filter cavity C11 of the third filter branch 103 are sequentially in the following ranges:

1839Mhz-1841Mhz、1839Mhz-1841Mhz、1839Mhz-1841Mhz、1811Mhz-1813Mhz、1836Mhz-1838Mhz、1840Mhz-1842Mhz、1852Mhz-1854Mhz、1840Mhz-1842Mhz、1822Mhz-1824Mhz、1839Mhz-1841Mhz、1839Mhz-1841Mhz。

a coupling bandwidth between the first common cavity P1 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 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 second filter cavity C2 of the third filter branch 103 and the fourth filter cavity C4 of the third filter branch 103, a coupling bandwidth between the third filter cavity C3 of the third filter branch 103 and the fifth filter cavity of the third filter branch 103, a coupling bandwidth between the third filter cavity C3 of the third filter branch 103 and the sixth filter cavity C6 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 C5 of the third filter branch 103, a coupling bandwidth between the third filter cavity C7342 of the third filter branch 103 and the sixth filter cavity C4642 of the third filter branch 103, A 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, a coupling bandwidth between the sixth filter cavity C6 of the third filter branch 103 and the eighth filter cavity C8 of the third filter branch 103, a 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, a coupling bandwidth between the eighth filter cavity C8 of the third filter branch 103 and the ninth filter cavity C9 of the third filter branch 103, a coupling bandwidth between the eighth filter cavity C8 of the third filter branch 103 and the tenth filter cavity C10 of the third filter branch 103, a coupling bandwidth between the ninth filter cavity C9 of the third filter branch 103 and the tenth filter cavity C10 of the third filter branch 103, a coupling bandwidth between the tenth filter cavity C10 of the third filter branch 103 and the eleventh filter cavity C11 of the third filter branch 103, The coupling bandwidths between the eleventh filter cavity C11 of the third filter branch 103 and the first port are respectively in the following ranges:

73Mhz-85Mhz、58Mhz-69Mhz、40Mhz-49Mhz、27Mhz-34Mhz、-28Mhz--27Mhz、3Mhz-8Mhz、21Mhz-28Mhz、35Mhz-43Mhz、34Mhz-42Mhz、33Mhz--41Mhz、-19Mhz--17Mhz、37Mhz-45Mhz、58Mhz-69Mhz、73Mhz-85Mhz。

therefore, the bandwidth of the third filtering branch 103 can be located within 1800-1882MHz, and the design requirement is met.

The eleven filter cavities of the fourth filter branch 104 are specifically the first filter cavity D1 through the eleventh filter cavity of the fourth filter branch 104.

As shown in fig. 5, in particular, the second filter cavity D2 through the ninth filter cavity D9 of the fourth filter branch 104 are divided into two columns arranged along the second direction D2; the ninth filtering cavity D9, the eighth filtering cavity D8, the seventh filtering cavity D7, the sixth filtering cavity D6 and the fifth filtering cavity D5 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 third filter cavity D3 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; the ninth filtering cavity D9, the eighth filtering cavity D8, the seventh filtering cavity D7, the sixth filtering cavity D6 and the fifth filtering cavity D5 of the fourth filtering branch 104 are sequentially arranged in an intersecting manner; the second filter cavity D2, the third filter cavity D3 and the fourth filter cavity D4 of the fourth filter branch 104 are sequentially intersected; the intersecting degrees of the intersecting arrangement are equal and equal to the intersecting degrees of the intersecting arrangement of the first filter cavity D1 and the second filter cavity D2 of the first filter branch 101; the third filter cavity D3 of the fourth filter branch 104 is respectively disposed adjacent to the seventh filter cavity D7 and the sixth filter cavity D6 of the fourth filter branch 104, the eighth filter cavity D8 of the fourth filter branch 104 is disposed adjacent to the seventh filter cavity D7 of the second filter branch 102, a projection of a center of the eighth filter cavity D8 of the fourth filter branch 104 in the first direction D1 is located between a center of the seventh filter cavity B7 of the second filter branch 102 and a projection of a center of the eighth filter cavity B8 of the second filter branch 102 in the first direction D1, the first filter cavity D1 and the second common cavity P2 of the fourth filter branch 104 are disposed at an interval, the first filter cavity D1 of the fourth filter branch 104 is respectively disposed adjacent to the second filter cavity D2 and the ninth filter cavity D9 of the fourth filter branch 104, and a common connection line of the first filter cavity D1 of the fourth filter branch 104 and the second filter cavity D1 of the fourth filter branch 104 is disposed adjacent to the third filter cavity D1 6 and the fourth common cavity P1 of the fourth filter branch 104, The line connecting the centers of the second filter cavities D2 forms an obtuse angle.

The second filtering cavity D2 to the ninth filtering cavity D9 of the fourth filtering branch 104 are divided into two columns arranged along the second direction D2, so that the gap between the filtering cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. The fourth filtering branch 104 and the second filtering branch 102 are arranged in a U shape, which has the same beneficial effect as the U-shaped arrangement of the second filtering branch 102, and is not described herein again. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10. The crossing arrangement of the filter wave cavities can avoid the traditional filter 10 from arranging a separation wall between the mutually coupled filter cavities and arranging a window on the separation wall, thereby being convenient for manufacturing, saving materials and further reducing the manufacturing cost, reducing the total volume occupied by the filter cavities and further reducing the volume of the filter 10. For a more detailed description, reference is made to the above description, which is not repeated herein.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a topology of the fourth filtering branch 104 of the filter 10 according to the present application.

As shown in fig. 7, the third filter cavity D3 and the sixth filter cavity D6 of the fourth filter branch 104, the third filter cavity D3 and the seventh filter cavity D7 of the fourth filter branch 104, and the fourth filter cavity and the sixth filter cavity D6 of the fourth filter branch 104 are inductively cross-coupled to form three fourth inductive cross-coupling zeros, respectively.

Specifically, the inductive cross coupling is realized between the third filter cavity D3 and the sixth filter cavity D6 of the fourth filter branch 104, between the third filter cavity D3 and the seventh filter cavity D7 of the fourth filter branch 104, and between the fourth filter cavity and the sixth filter cavity D6 of the fourth filter branch 104 by opening windows and setting metal coupling ribs, which is detailed above.

The cross-coupling zero points of the fourth filtering branch 104 are all inductive coupling zero points, the material consistency is good, and temperature drift can be prevented.

The embodiment at least has the following beneficial effects: different from the prior art, on one hand, the arrangement of taps and welding points is reduced by the arrangement of the first and second common cavities and the adjacent arrangement of the first, second, third and fourth filtering branches, the arrangement of the filtering branches is relatively compact, and the size of the filter 10 can be further reduced, and the sizes of the first and second common cavities are equal to the sizes of the filtering cavities of the second and fourth filtering branches, so that the design and the manufacture are convenient; on the other hand, zero point suppression is realized through cross coupling zero points formed by the first filtering branch, the second filtering branch, the third filtering branch and the fourth filtering branch, and isolation among different filtering branches can be improved.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a third embodiment of a filter 10 according to the present application.

As shown in fig. 8, on the basis of the second embodiment, the filter 10 of the present embodiment further includes: a third common chamber P3 provided on the case 210; the fifth filtering branch 105 is arranged on the shell 210, is coupled with the third common cavity P3 and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the fifth filtering branch 105 form four first cross-coupling zeros; the sixth filtering branch 106 and the third filtering branch 103 are arranged at an interval along the first direction D1, and are coupled with the third common cavity P3, and are composed of nine filtering cavities that are coupled in sequence, and the nine filtering cavities of the sixth filtering branch 106 form three sixth inductive cross-coupling zeros.

Preferably, in this embodiment, all the filter cavities of the fifth filter branch 105 are equal in size, all the filter cavities of the sixth filter branch 106 are equal in size, all the filter cavities of the seventh filter branch 107 are equal in size, all the filter cavities of the eighth filter branch 108 are equal in size, the filter cavities of the fifth and seventh filter branches are equal in size to the filter cavity of the first filter branch 101, the filter cavities of the sixth and eighth filter branches are equal in size to the filter cavity of the second filter branch 102, and the third and fourth common cavities are equal in size to the filter cavities of the sixth and eighth filter branches.

The fifth and sixth filtering branches are both coupled to the third common cavity P3, and the fifth and sixth filtering branches are disposed adjacent to the third and fourth filtering branches, so that the size of the filter 10 can be reduced.

As shown in fig. 8, the first through tenth filter cavities E1 through E10 of the fifth filter branch 105 are divided into five columns arranged along the first direction D1; the tenth filter cavity E10 and the ninth filter cavity E9 of the fifth filter branch 105 are in a row and are sequentially arranged along the second direction D2; the eighth filter cavity E8 and the seventh filter cavity E7 of the fifth filter branch 105 are in a row and are sequentially arranged along the second direction D2; the fifth filter cavity E5 and the sixth filter cavity E6 of the fifth filter branch 105 are in a row and are sequentially arranged along the second direction D2; the fourth filter cavity E4 and the third filter cavity E3 of the fifth filter branch 105 are in a row and are sequentially arranged along the second direction D2; the first filter cavity E1 and the second filter cavity E2 of the fifth filter branch 105 are in a row and are sequentially arranged along the second direction D2; the eleventh filter cavity E11 of the fifth filter branch 105, the tenth filter cavity E10 and the ninth filter cavity E9 of the fifth filter branch 105 are arranged in a triangle, and the projection of the center of the eleventh filter cavity E11 of the fifth filter branch 105 in the second direction D2 is located between the projection of the centers of the ninth filter cavity E9 and the tenth filter cavity E10 of the fifth filter branch 105 in the second direction D2, and the eleventh filter cavity E11 of the fifth filter branch 105 is adjacent to and spaced from the tenth filter cavity E10 and the ninth filter cavity E9 of the fifth filter branch 105, respectively, the eighth filter cavity E8 of the fifth filter branch 105 is adjacent to and spaced from the tenth filter cavity E10, the ninth filter cavity E9, the seventh filter cavity E7, the fifth filter cavity E5, the sixth filter cavity E6 of the fifth filter branch 105, and the fifth filter cavity E3 and the fifth filter cavity E5 of the fifth filter branch 105 are adjacent to and the fifth filter cavity E5, respectively, The fourth filter cavity E4, the first filter cavity E1, and the second filter cavity E2 are disposed adjacent to each other, the first filter cavity E1 and the third common cavity P3 of the fifth filter branch 105 are disposed at an interval, and an included angle between a connecting line of a center of the third common cavity P3 and a center of the first filter cavity E1 of the fifth filter branch 105 and a connecting line of centers of the first filter cavity E1 and the second filter cavity E2 of the fifth filter branch 105 is an acute angle.

The first filter cavity E1 to the tenth filter cavity E10 of the fifth filter branch 105 are divided into five rows arranged along the first direction D1, so that the gap between the filter cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. The fifth filtering branches are arranged in a zigzag shape, and are not described herein again. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10.

Among them, it is worth mentioning: the cross-coupling zeros of the fifth filter branch 105 and the third filter branch 103 are the same, and the resonant frequencies of the first filter cavity E1 through the eleventh filter cavity E11 of the fifth filter branch 105 are equal to the resonant frequencies of the first filter cavity C1 through the eleventh filter cavity C11 of the third filter branch 103, respectively. And the coupling bandwidth between the cavities of the fifth filtering branch 105 is respectively equal to the coupling bandwidth between the cavities of the third filtering branch 103, for example, the coupling bandwidth between the third filter cavity E3 and the fifth filter cavity E5 of the fifth filtering branch 105 is equal to the coupling bandwidth between the third filter cavity E3 and the fifth filter cavity E5 of the third filtering branch 103, and so on. Therefore, the topological diagram of the fifth filtering branch 105 can be seen in the topological diagram of the third filtering branch 103, and the resonant frequency and the coupling bandwidth of the fifth filtering branch 105 can be seen in the resonant frequency and the coupling bandwidth of the third filtering branch 103.

Specifically, capacitive cross coupling is respectively performed between the third filter cavity E3 and the fifth filter cavity E5 of the fifth filter branch 105, between the eighth filter cavity E8 and the tenth filter cavity E10 of the fifth filter branch 105, inductive cross coupling is respectively performed between the third filter cavity E3 and the sixth filter cavity E6 of the fifth filter branch 105, and between the sixth filter cavity E6 and the eighth filter cavity E8 of the fifth filter branch 105, so as to form four fifth cross coupling zeros.

The capacitive cross-coupling zero point is formed by the flying bar, and the inductive cross-coupling zero point is formed by opening the window and arranging the metal coupling ribs, which is not described herein again.

The nine filter cavities of the sixth filter branch 106 are specifically the first filter cavity F1 through the ninth filter cavity F9 of the sixth filter branch.

As shown in fig. 8, in particular, the nine filter cavities of the sixth filter branch 106 are divided into two columns arranged along the second direction D2; the first filter cavity F1, the second filter cavity F2, the third filter cavity F3 and the fourth filter cavity F4 of the sixth filter branch 106 are in a row and are sequentially arranged along the first direction D1; the ninth filtering cavity F9, the eighth filtering cavity F8, the seventh filtering cavity F7, the sixth filtering cavity F6 and the fifth filtering cavity F5 of the sixth filtering branch 106 are in a row and are sequentially arranged along the first direction D1; the second filter cavity F2, the third filter cavity F3 and the fourth filter cavity F4 of the sixth filter branch 106 are sequentially intersected; the ninth filtering cavity F9, the eighth filtering cavity F8, the seventh filtering cavity F7, the sixth filtering cavity F6 and the fifth filtering cavity F5 of the sixth filtering branch 106 are sequentially intersected; the intersecting degrees of the intersecting arrangement are equal and equal to the intersecting degrees of the intersecting arrangement of the first filter cavity A1 and the second filter cavity F2 of the first filter branch 101; the first filter cavity F1 of the sixth filter branch 106 intersects with the second filter cavity F2 and the ninth filter cavity F9 of the sixth filter branch 106, the first filter cavity F1 and the eighth filter cavity F8 of the sixth filter branch 106 are arranged at intervals, the first filter cavity F1 of the sixth filter branch 106 is arranged at intervals with the third common cavity P3, and the intersection degree of the intersection arrangement of the first filter cavity F1 and the ninth filter cavity F9 of the sixth filter branch 106 is smaller than the intersection degree of the intersection arrangement of the first filter cavity F1 and the second filter cavity F2 of the sixth filter branch 106 is smaller than the intersection degree of the intersection arrangement of the intersection of the second filter cavity F2 and the third filter cavity F3 of the sixth filter branch 106; the seventh filtering cavity F7 of the sixth filtering branch 106 is respectively adjacent to the second filtering cavity F2 and the third filtering cavity F3 of the sixth filtering branch 106, an included angle between a connection line of centers of the first filtering cavity F1 and the third common cavity P3 of the sixth filtering branch 106 and a connection line of centers of the first filtering cavity F1 and the second filtering cavity F2 of the sixth filtering branch 106 is an obtuse angle, and a connection line of centers of the third common cavity P3 and the second common cavity P2 is located on the same straight line.

The nine filter cavities of the sixth filter branch 106 are divided into two rows arranged along the second direction D2, so that the gap between the filter cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. The sixth filtering branch is arranged in a U shape, which is not described herein again. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10. The crossing arrangement of the filter wave cavities can avoid the traditional filter 10 from arranging a separation wall between the mutually coupled filter cavities and arranging a window on the separation wall, thereby being convenient for manufacturing, saving materials and further reducing the manufacturing cost, reducing the total volume occupied by the filter cavities and further reducing the volume of the filter 10. For a more detailed description, reference is made to the above description, which is not repeated herein.

Among them, it is worth mentioning: the sixth filtering branch 106 is identical to the cross-coupling zero of the fourth filtering branch 104, and the resonant frequencies of the first filtering cavity F1 through the ninth filtering cavity F9 of the sixth filtering branch 106 are respectively equal to the resonant frequencies of the first filtering cavity D1 through the ninth filtering cavity D9 of the fourth filtering branch 104. And the coupling bandwidth between the cavities of the sixth filtering branch 106 is respectively equal to the coupling bandwidth between the cavities of the fourth filtering branch 104, for example, the coupling bandwidth between the third filtering cavity F3 and the seventh filtering cavity F7 of the sixth filtering branch 106 is equal to the coupling bandwidth between the third filtering cavity D3 and the seventh filtering cavity D7 of the fourth filtering branch 104, and so on. Therefore, the topological diagram of the sixth filtering branch 106 can be seen in the topological diagram of the fourth filtering branch 104, and the resonant frequency and the coupling bandwidth of the sixth filtering branch 106 can be seen in the resonant frequency and the coupling bandwidth of the fourth filtering branch 104.

Inductive cross-coupling is respectively performed between the third filter cavity F3 and the sixth filter cavity F6 of the sixth filter branch 106, between the third filter cavity F3 and the seventh filter cavity F7 of the sixth filter branch 106, and between the fourth filter cavity F4 and the sixth filter cavity F6 of the sixth filter branch 106, so as to form three sixth inductive cross-coupling zeros.

The eleven filter cavities of the seventh filter branch 107 are specifically the first filter cavity G1 through the eleventh filter cavity G11 cavities of the seventh filter branch 107.

As shown in fig. 8, the filter 10 of the present embodiment further includes: a fourth common chamber P4 provided on the case 210; the seventh filtering branch 107 and the fifth filtering branch 105 are sequentially and adjacently arranged along the second direction D2, are coupled with the fourth common cavity P4, and are composed of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the seventh filtering branch 107 form four seventh cross-coupling zeros; and the eighth filtering branch 108 and the sixth filtering branch 106 are sequentially and adjacently arranged along the first direction D1, are coupled with the fourth common cavity P4, and are composed of nine filtering cavities that are sequentially coupled, and the nine filtering cavities of the eighth filtering branch 108 form three eighth inductive cross-coupling zeros.

The seventh and eighth filtering branches are respectively coupled to the fourth common cavity P4, and the seventh and eighth filtering branches are respectively disposed adjacent to the fifth and sixth filtering branches, so that the size of the filter 10 can be reduced.

As shown in fig. 8, the second through tenth filtering chambers G2 through G10 of the seventh filtering branch 107 are divided into five columns arranged along the first direction D1; the tenth filtering cavity G10 and the ninth filtering cavity G9 of the seventh filtering branch 107 are in a row and are sequentially arranged along the second direction D2; the eighth filtering cavities G8 of the seventh filtering branch 107 are in one row; the sixth filtering cavity G6 and the seventh filtering cavity G7 of the seventh filtering branch 107 are in a row and are sequentially arranged along the second direction D2; the fifth filtering cavity G5 and the third filtering cavity G3 of the seventh filtering branch 107 are in a row and are sequentially arranged along the second direction D2; the fourth filtering cavity G4 and the second filtering cavity G2 of the seventh filtering branch 107 are in a row and are sequentially arranged along the second direction D2; an included angle between a connecting line of centers of the eleventh filter cavity G11 and the tenth filter cavity G10 of the seventh filter branch 107 and a connecting line of centers of the ninth filter cavity G9 and the tenth filter cavity G10 of the seventh filter branch 107 is an acute angle, an included angle between the tenth filter cavity G10 and the eleventh filter cavity G11 of the seventh filter branch 107 is adjacently disposed, the eighth filter cavity G8 of the seventh filter branch 107 is adjacently disposed to the tenth filter cavity G10, the ninth filter cavity G9, the sixth filter cavity G6 and the seventh filter cavity G7 of the seventh filter branch 107, an eighth filter cavity G8 of the seventh filter branch 107 is adjacently disposed to the seventh filter cavity E7 of the fifth filter branch 105, an eighth filter cavity G8 of the seventh filter branch 107, a seventh filter cavity E7 of the fifth filter branch 105 and a connecting line between the eighth filter cavity E8 of the seventh filter branch 107 and a connecting line of the seventh filter cavity G8 are respectively disposed to the seventh filter cavity G107, and a connecting line between the seventh filter cavity G3 and a connecting line of the seventh filter cavity G107, The seventh filtering cavity G7, the fifth filtering cavity G5, the fourth filtering cavity G4 and the second filtering cavity G2 are adjacently arranged, the first filtering cavity G1 and the second filtering cavity G2 of the seventh filtering branch 107 are arranged at intervals, and 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 centers of the second filtering cavity G2 and the fourth filtering cavity G4 of the seventh filtering branch 107 is an acute angle.

The second filtering cavity G2 through the tenth filtering cavity G10 of the seventh filtering branch 107 are divided into five rows arranged along the first direction D1, so that the gap between the filtering cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. The seventh filtering branches are arranged in a zigzag manner, and are not described in detail herein. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10.

Among them, it is worth mentioning: the seventh filtering branch 107 is identical to the cross-coupling zero of the third filtering branch 103, and the resonant frequencies of the first filtering cavity G1 through the eleventh filtering cavity G11 of the seventh filtering branch 107 are equal to the resonant frequencies of the first filtering cavity C1 through the eleventh filtering cavity C11 of the third filtering branch 103, respectively. And the coupling bandwidth between the cavities of the seventh filtering branch 107 is respectively equal to the coupling bandwidth between the cavities of the third filtering branch 103, for example, the coupling bandwidth between the third filtering cavity G3 and the fifth filtering cavity G5 of the seventh filtering branch 107 is equal to the coupling bandwidth between the third filtering cavity C3 and the fifth filtering cavity C5 of the third filtering branch 103, and so on. Therefore, with respect to the topology diagram of the seventh filtering branch 107, the topology diagram of the third filtering branch 103 can be seen, and the resonant frequency and the coupling bandwidth of the seventh filtering branch 107 can be seen from the resonant frequency and the coupling bandwidth of the third filtering branch 103.

Capacitive cross coupling is respectively performed between the third filtering cavity G3 and the fifth filtering cavity G5 of the seventh filtering branch 107, between the eighth filtering cavity G8 and the tenth filtering cavity G10 of the seventh filtering branch 107, between the third filtering cavity G3 and the sixth filtering cavity G6 of the seventh filtering branch 107, and between the sixth filtering cavity G6 and the eighth filtering cavity G8 of the seventh filtering branch 107, so as to form four seventh cross-coupling zeros.

The nine filter cavities of the eighth filter branch 108 are specifically the first filter cavity H1 through the ninth filter cavity H9 of the eighth filter branch 108.

As shown in fig. 8, the first filter cavity H1 through the eighth filter cavity H8 of the eighth filter branch 108 are divided into two columns arranged along the second direction D2; the eighth filtering cavity H8, the seventh filtering cavity H7, the sixth filtering cavity H6, the fifth filtering cavity H5 and the fourth filtering cavity H4 of the eighth filtering branch 108 are in a row and are sequentially arranged along the first direction D1; the first filtering cavity H1, the second filtering cavity H2 and the third filtering cavity H3 of the eighth filtering branch 108 are in a row and are sequentially arranged along the first direction D1; the eighth filtering cavity H8, the seventh filtering cavity H7, the sixth filtering cavity H6, the fifth filtering cavity H5 and the fourth filtering cavity H4 of the eighth filtering branch 108 are sequentially intersected; the first filtering cavity H1, the second filtering cavity H2 and the third filtering cavity H3 of the eighth filtering branch 108 are sequentially intersected; the ninth filter cavity H9 of the eighth filter branch 108 intersects the eighth filter cavity H8 of the eighth filter branch 108; the first filtering cavity H1 of the eighth filtering branch 108 intersects the fourth common cavity P4; the intersecting degrees of the intersecting arrangement are equal and equal to the intersecting degrees of the intersecting arrangement of the first filter cavity A1 and the second filter cavity A2 of the first filter branch 101; the first filter cavity H1 of the eighth filter branch 108 is respectively disposed adjacent to the seventh filter cavity H7 and the sixth filter cavity H6 of the eighth filter branch 108, the ninth filter cavity H9 of the eighth filter branch 108 is respectively disposed adjacent to the first filter cavity G1 and the fourth filter cavity G4 of the seventh filter branch 107, the fourth common cavity P4 is disposed adjacent to the first filter cavity G1 of the seventh filter branch 107, the seventh filter cavity H7 of the eighth filter branch 108 is disposed adjacent to the eighth filter cavity H8 of the sixth filter branch 106, and a projection of a center of the eighth filter cavity H8 of the eighth filter branch 108 on the first direction D1 is located between projections of a center of the eighth filter cavity F8, a center of the seventh filter cavity F38 on the sixth filter branch 106, a projection of a center of the eighth filter cavity H2 of the eighth filter cavity H4 and a projection of a center of the eighth filter cavity H2 of the eighth filter cavity P4 on the first direction D1, and a projection of a center of the second filter cavity H2 of the eighth filter cavity H108 on the sixth filter branch 108, The connecting lines of the centers of the first filter cavities G1 of the seventh filter branch 107 are located on the same straight line.

The first filtering cavity H1 to the eighth filtering cavity H8 of the eighth filtering branch 108 are divided into two columns arranged along the second direction D2, so that the gap between the filtering cavities can be reduced, the structure of the filter 10 is more compact, and the size of the filter 10 is further reduced. The eighth filtering branches are arranged in a U-shape, and are not described herein again. By adjacent arrangement of the filter cavities, the gap between the filter cavities can be further reduced, thereby further reducing the volume of the filter 10. The crossing arrangement of the filter wave cavities can avoid the traditional filter 10 from arranging a separation wall between the mutually coupled filter cavities and arranging a window on the separation wall, thereby being convenient for manufacturing, saving materials and further reducing the manufacturing cost, reducing the total volume occupied by the filter cavities and further reducing the volume of the filter 10. For a more detailed description, reference is made to the above description, which is not repeated herein.

Among them, it is worth mentioning: the eighth filtering branch 108 is identical to the cross-coupling zero of the second filtering branch 102, and the resonant frequencies of the first filtering cavity H1 through the ninth filtering cavity H9 of the eighth filtering branch 108 are respectively equal to the resonant frequencies of the first filtering cavity B1 through the ninth filtering cavity B9 of the second filtering branch 102. And the coupling bandwidth between the cavities of the eighth filtering branch 108 is respectively equal to the coupling bandwidth between the cavities of the second filtering branch 102, for example, the coupling bandwidth between the second filtering cavity H2 and the fifth filtering cavity H5 of the eighth filtering branch 108 is equal to the coupling bandwidth between the second filtering cavity B2 and the fifth filtering cavity B5 of the second filtering branch 102, and so on. Therefore, the topological diagram of the eighth filtering branch 108 can be seen in the topological diagram of the second filtering branch 102, and the resonant frequency and the coupling bandwidth of the eighth filtering branch 108 can be seen in the resonant frequency and the coupling bandwidth of the second filtering branch 102.

Specifically, inductive cross coupling is respectively performed between the second filter cavity H2 and the fifth filter cavity H5 of the eighth filter branch 108, between the second filter cavity H2 and the sixth filter cavity H6 of the eighth filter branch 108, and between the third filter cavity H3 and the fifth filter cavity H5 of the eighth filter branch 108, so as to form three eighth inductive cross coupling zeros.

The embodiment at least has the following beneficial effects: different from the prior art, on one hand, the arrangement of taps and welding points is reduced by the arrangement of the first, second, third and fourth common cavities and the specific adjacent arrangement of the first to eighth filtering branches 108, the arrangement among the filtering branches is relatively compact, and further the size of the filter 10 can be reduced, and the sizes of the first, second, third and fourth common cavities are equal to the sizes of the filtering cavities of the second, fourth, sixth and eighth filtering branches, so that the design and the manufacture are convenient; on the other hand, zero point suppression is realized through the cross-coupling zero points formed by the first to eighth filtering branches 108, and isolation between different filtering branches can be improved.

Please refer to fig. 9, which is a diagram illustrating simulation results of the filter 10 provided in the present application.

As shown in fig. 9, the bandwidths (see the frequency band 110) of the second, fourth, sixth, and eight filtering branches of the filter 10 provided by the present application are within 1706-1790MHz, and the bandwidths of the second, fourth, sixth, and eight filtering branches of the filter 10 are suppressed to be greater than 75dB at 1805MHz, and suppressed to be greater than 80dB at 1825 MHz.

As shown in fig. 9, the bandwidths (see the frequency band 120) of the first, third, fifth and seventh filtering branches are located in 1800-1882MHz, the suppression of the bandwidths of the first, third, fifth and seventh filtering branches is greater than 113dB at 1775MHz, and greater than 105dB at 1785 MHz.

Therefore, good isolation can be generated between the filtering branches of the filter 10 of the present application, and the design requirements can be met.

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 101010 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 the filter 1010, 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 chamber disposed on the housing;

the first filtering branch is arranged on the shell, is coupled with the first common cavity and consists of eleven filtering cavities which are sequentially coupled, and the eleven 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 along the first direction, coupled with the first common cavity and composed of nine filtering cavities which are sequentially coupled, and the nine filtering cavities of the second filtering branch form three second inductive cross-coupling zero points;

eleven filtering cavities of the first filtering branch are arranged in a broken line shape, nine filtering cavities of the second filtering branch are arranged in a U shape, and the first common cavity is arranged between the first cavity of the first filtering branch and the first cavity of the second filtering branch.

2. The filter of claim 1,

eleven filter cavities of the first filter branch circuit are divided into seven rows arranged along the first direction;

the eleventh filtering cavities of the first filtering branch are in one row;

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

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

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

the fourth filtering cavities of the first filtering branch are in a row;

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

the first filtering cavities of the first filtering branch are in a row;

the eleventh filter cavity of the first filter branch is respectively adjacent to the tenth filter cavity and the eighth filter cavity of the first filter branch, the ninth filter cavity of the first filter branch is respectively adjacent to the tenth filter cavity, the eighth filter cavity, the seventh filter cavity, the fifth filter cavity and the sixth filter cavity of the first filter branch, the fourth filter cavity of the first filter branch is respectively adjacent to the fifth filter cavity, the sixth filter cavity, the third filter cavity and the second filter cavity of the first filter branch, the first filter cavity and the second filter cavity of the first filter branch are adjacent to each other, a connecting line of centers of the first filter cavity and the second filter cavity of the first filter branch is connected with a connecting line of centers of the second filter cavity and the third filter cavity of the first filter branch, an included angle is an acute angle, and a projection of the center of the first filter cavity of the first filter branch in the second direction is located on the second filter cavity of the second branch Between projections of a center of a fourth filter cavity in the second direction;

capacitive cross coupling is respectively performed between the second filtering cavity and the fourth filtering cavity of the first filtering branch, between the seventh filtering cavity and the ninth filtering cavity of the first filtering branch, and inductive cross coupling is respectively performed between the fourth filtering cavity and the sixth filtering cavity of the first filtering branch and 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 common cavity and the nine filter cavities of the second filter branch are divided into two rows arranged along the second direction;

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

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

the first common cavity and the first filtering cavity, the second filtering cavity and the third filtering cavity of the second filtering branch are sequentially arranged in an intersecting manner;

the eighth filtering cavity, the seventh filtering cavity, the sixth filtering cavity, the fifth filtering cavity and the fourth filtering cavity of the second filtering branch are sequentially intersected;

and the intersection degrees of the intersection arrangement are all equal;

the first filter cavity of the second filter branch is respectively adjacent to the seventh filter cavity and the sixth filter cavity of the second filter branch;

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

4. The filter of claim 1, further comprising:

a second common cavity disposed on the housing;

the third filtering branch is sequentially adjacent to the first filtering branch along the second direction, is coupled with the second common cavity, and consists of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the third filtering branch form four third cross coupling zeros;

the fourth filtering branch is sequentially adjacent to the second filtering branch along the second direction, is coupled with the second common cavity, and consists of nine filtering cavities which are sequentially coupled, and the nine filtering cavities of the fourth filtering branch form three fourth inductive cross-coupling zero points;

eleven filter cavities of the third filter branch circuit are divided into five rows arranged along the first direction;

the eleventh filtering cavities of the third filtering branch are in one row;

the tenth filtering cavity and the ninth filtering cavity of the third filtering branch are in a row and are sequentially arranged along the second direction;

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

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

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

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

the eleventh filter cavity of the third filter branch is respectively adjacent to the tenth filter cavity and the ninth filter cavity of the third filter branch, the eighth filter cavity of the third filter branch is respectively adjacent to the tenth filter cavity, the ninth filter cavity, the seventh filter cavity, the fifth filter cavity and the sixth filter cavity of the third filter branch, the eighth filter cavity of the third filter branch is adjacent to the seventh filter cavity of the first filter branch, the connecting line of the center of the eighth filter cavity of the third filter branch, the center of the ninth filter cavity of the first filter branch and the connecting line of the center of the ninth filter cavity of the first filter branch are located on the same straight line, and the third filter cavity of the third filter branch is respectively adjacent to the fifth filter cavity, the sixth filter cavity, the fourth filter cavity, the second filter cavity and the first filter cavity of the third filter branch, the second filter cavity of the third filter branch is adjacent to the ninth filter cavity of the second filter branch, the first filter cavity of the third filter branch is spaced from the second common cavity, and an included angle between a connecting line of the center of the second common cavity and the center of the third filter branch and a connecting line of the centers of the first filter cavity and the second filter of the third filter branch is an obtuse angle;

capacitive cross coupling is respectively performed between a third filtering cavity and a fifth filtering cavity of the third filtering branch, between an eighth filtering cavity and a tenth filtering cavity of the third filtering branch, inductive cross coupling is respectively performed between the third filtering cavity and a sixth filtering cavity of the third filtering branch, and between the sixth filtering cavity and the eighth filtering cavity of the third filtering branch, so that four third cross coupling zeros are formed.

5. The filter of claim 4,

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

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

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

the ninth filtering cavity, the eighth filtering cavity, the seventh filtering cavity, the sixth filtering cavity and the fifth filtering cavity of the fourth filtering branch are sequentially arranged in an intersecting manner;

the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the fourth filtering branch are sequentially intersected;

the intersecting degrees of the intersecting arrangement are equal and equal to the intersecting degrees of the first filter cavity and the second filter cavity of the first filter branch circuit;

the third filter cavity of the fourth filter branch is respectively adjacent to the seventh filter cavity and the sixth filter cavity of the fourth filter branch, the eighth filter cavity of the fourth filter branch is adjacent to the seventh filter cavity of the second filter branch, the projection of the center of the eighth filter cavity of the fourth filter branch in the first direction is located between the center of the seventh filter cavity of the second filter branch and the projection of the center of the eighth filter cavity of the second filter branch in the first direction, the first filter cavity of the fourth filter branch is spaced from the second common cavity, the first filter cavity of the fourth filter branch is respectively adjacent to the second filter cavity and the ninth filter cavity of the fourth filter branch, and the connecting line of the centers of the first filter cavity and the second common cavity of the fourth filter branch is connected with the first filter cavity and the first common cavity of the fourth filter branch, The included angle of the connecting line of the centers of the second filtering cavities is an obtuse angle;

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

6. The filter of claim 4, further comprising:

a third common chamber disposed on the housing;

the fifth filtering branch is arranged on 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 four first cross-coupling zeros;

the sixth filtering branch and the third filtering branch are arranged at intervals along the first direction, are coupled with the third common cavity and are composed of nine filtering cavities which are sequentially coupled, and the nine filtering cavities of the sixth filtering branch form three sixth inductive cross-coupling zero points;

the first filtering cavity to the tenth filtering cavity of the fifth filtering branch are divided into five rows arranged along the first direction;

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

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

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

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

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

the eleventh filter cavity of the fifth filter branch and the tenth filter cavity and the ninth filter cavity of the fifth filter branch are arranged in a triangular manner, the projection of the eleventh filter cavity of the fifth filter branch in the second direction is located between the projection of the ninth filter cavity and the projection of the tenth filter cavity of the fifth filter branch in the second direction, the eleventh filter cavity of the fifth filter branch is adjacent to and spaced from the tenth filter cavity and the ninth filter cavity of the fifth filter branch, the eighth filter cavity of the fifth filter branch is adjacent to and spaced from the tenth filter cavity, the ninth filter cavity, the seventh filter cavity, the fifth filter cavity and the sixth filter cavity of the fifth filter branch, and the third filter cavity of the fifth filter branch is adjacent to and spaced from the fifth filter cavity, the sixth filter cavity, the ninth filter cavity, the seventh filter cavity, the fifth filter cavity and the sixth filter cavity of the fifth filter branch, The fourth filtering cavity, the first filtering cavity and the second filtering cavity are adjacently arranged, the first filtering cavity of the fifth filtering branch circuit and the third common cavity are arranged at intervals, and an included angle between a connecting line of the center of the third common cavity and the center of the first filtering cavity of the fifth filtering branch circuit and a connecting line of the centers of the first filtering cavity and the second filtering cavity of the fifth filtering branch circuit is an acute angle;

capacitive cross coupling is respectively performed between a third filtering cavity and a fifth filtering cavity of the fifth filtering branch, between an eighth filtering cavity and a tenth filtering cavity of the fifth filtering branch, and inductive cross coupling is respectively performed between the third filtering cavity and a sixth filtering cavity of the fifth filtering branch, and between the sixth filtering cavity and the eighth filtering cavity of the fifth filtering branch, so as to form four fifth cross coupling zeros.

7. The filter of claim 6,

nine filter cavities of the sixth filter branch are divided into two rows arranged along the second direction;

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

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

the second filtering cavity, the third filtering cavity and the fourth filtering cavity of the sixth filtering branch are sequentially intersected;

a ninth filtering cavity, an eighth filtering cavity, a seventh filtering cavity, a sixth filtering cavity and a fifth filtering cavity of the sixth filtering branch are sequentially arranged in an intersecting manner;

the first filter cavity of the sixth filter branch is respectively intersected with the second filter cavity and the ninth filter cavity of the sixth filter branch, the first filter cavity and the eighth filter cavity of the sixth filter branch are arranged at intervals, the first filter cavity of the sixth filter branch is arranged at intervals with the third common cavity, and the intersection degree of the intersection arrangement of the first filter cavity and the ninth filter cavity of the sixth filter branch is smaller than the intersection degree of the intersection arrangement of the first filter cavity and the second filter cavity of the sixth filter branch;

the seventh filtering cavity of the sixth filtering branch is respectively adjacent to the second filtering cavity and the third filtering cavity of the sixth filtering branch, an included angle between a connecting line of centers of the first filtering cavity of the sixth filtering branch and the third common cavity and a connecting line of centers of the first filtering cavity and the second filtering cavity of the sixth filtering branch is an obtuse angle, and the connecting lines of centers of the third common cavity and the second common cavity are positioned on the same straight line;

and the third filtering cavity and the sixth filtering cavity of the sixth filtering branch, the third filtering cavity and the seventh filtering cavity of the sixth filtering branch, and the fourth filtering cavity and the sixth filtering cavity of the sixth filtering branch are inductively and cross-coupled to form three sixth inductive cross-coupling zeros.

8. The filter of claim 6, further comprising:

a fourth common chamber disposed on the housing;

the seventh filtering branch and the fifth filtering branch are sequentially and adjacently arranged along the second direction, are coupled with the fourth common cavity and are composed of eleven filtering cavities which are sequentially coupled, and the eleven filtering cavities of the seventh filtering branch form four seventh cross-coupling zeros;

the eighth filtering branch and the sixth filtering branch are sequentially and adjacently arranged along the first direction, are coupled with the fourth common cavity and are composed of nine filtering cavities which are sequentially coupled, and the nine filtering cavities of the eighth filtering branch form three eighth inductive cross-coupling zero points;

the second filtering cavity to the tenth filtering cavity of the seventh filtering branch are divided into five rows arranged along the first direction;

the tenth filtering cavity and the ninth filtering cavity of the seventh filtering branch are in a row and are sequentially arranged along the second direction;

the eighth filtering cavities of the seventh filtering branch are in a row;

the sixth filtering cavities and the seventh filtering cavities of the seventh filtering branch are in a row and are sequentially arranged along the second direction;

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

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

the connecting line of the centers of the eleventh filter cavity and the tenth filter cavity of the seventh filter branch and the connecting line of the centers of the ninth filter cavity and the tenth filter cavity of the seventh filter branch are acute angles, the tenth filter cavity and the eleventh filter cavity of the seventh filter branch are adjacently arranged, the eighth filter cavity of the seventh filter branch is adjacently arranged with the tenth filter cavity, the ninth filter cavity, the sixth filter cavity and the seventh filter cavity of the seventh filter branch respectively, the eighth filter cavity of the seventh filter branch and the seventh filter cavity of the fifth filter branch are adjacently arranged, the connecting line of the eighth filter cavity of the seventh filter branch and the seventh filter cavity and the eighth filter cavity of the fifth filter branch are on the same straight line, and the third filter cavity of the seventh filter branch and the sixth filter cavity, the tenth filter cavity and the eleventh filter cavity of the seventh filter branch are respectively arranged with the acute angles, A seventh filtering cavity, a fifth filtering cavity, a fourth filtering cavity and a second filtering cavity are adjacently arranged, the first filtering cavity and the second filtering cavity of the seventh filtering branch are arranged at intervals, and 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;

capacitive cross coupling is respectively performed between a third filtering cavity and a fifth filtering cavity of the seventh filtering branch, between an eighth filtering cavity and a tenth filtering cavity of the seventh filtering branch, inductive cross coupling is respectively performed between the third filtering cavity and a sixth filtering cavity of the seventh filtering branch, and between the sixth filtering cavity and the eighth filtering cavity of the seventh filtering branch, so as to form four seventh cross coupling zeros.

9. The filter of claim 8,

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

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

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

the eighth filtering cavity, the seventh filtering cavity, the sixth filtering cavity, the fifth filtering cavity and the fourth filtering cavity of the eighth filtering branch are sequentially intersected;

the first filtering cavity, the second filtering cavity and the third filtering cavity of the eighth filtering branch are sequentially intersected;

a ninth filter cavity of the eighth filter branch is intersected with the eighth filter cavity of the eighth filter branch; the first filtering cavity of the eighth filtering branch is intersected with the fourth common cavity;

the first filter cavity of the eighth filter branch is respectively adjacent to the seventh filter cavity and the sixth filter cavity of the eighth filter branch, the ninth filter cavity of the eighth filter branch is respectively adjacent to the first filter cavity and the fourth filter cavity of the seventh filter branch, the fourth common cavity is adjacent to the first filter cavity of the seventh filter branch, the seventh filter cavity of the eighth filter branch is adjacent to the eighth filter cavity of the sixth filter branch, the projection of the center of the eighth filter cavity of the eighth filter branch in the first direction is located between the projection of the centers of the eighth filter cavity and the seventh filter cavity of the sixth filter branch in the first direction, and the center of the fourth common cavity is located between the center of the first filter cavity of the eighth filter branch, the center of the second filter cavity of the eighth filter branch, the center of the sixth filter cavity of the eighth filter branch, the projection of the fourth common cavity and the projection of the first filter cavity of the eighth filter branch in the first direction, The connecting lines of the centers of the first filter cavities of the seventh filter branch circuit are positioned on the same straight line;

and the third filter cavity and the fifth filter cavity of the eighth filter branch are in inductive cross coupling respectively to form three eighth inductive 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.