CN113497316B

CN113497316B - Filter and communication equipment

Info

Publication number: CN113497316B
Application number: CN202010271310.2A
Authority: CN
Inventors: 陈砚昌
Original assignee: Anhui Tatfook Technology Co Ltd
Current assignee: Anhui Tatfook Technology Co Ltd
Priority date: 2020-04-08
Filing date: 2020-04-08
Publication date: 2023-06-20
Anticipated expiration: 2040-04-08
Also published as: CN113497316A

Abstract

The application discloses a filter and communication equipment. The filter includes: a housing having a first direction and a second direction perpendicular to each other; ten filter cavities are arranged on the shell, are sequentially coupled along a main coupling path, and are respectively and capacitively coupled in a cross manner between a second filter cavity and a fourth filter cavity, between the fourth filter cavity and a sixth filter cavity, between the sixth filter cavity and an eighth filter cavity and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities so as to form four capacitive coupling zeros of the filter; wherein, ten filter cavities divide into three columns that arrange in proper order along the second direction. By the mode, the material consistency of the filter is improved, the size of the filter is reduced, and the cost is saved.

Description

Filter and communication equipment

Technical Field

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

Background

The cavity filter is key equipment of a modern mobile communication system and is widely applied to wireless communication base stations and various communication terminals; the cavity filter consists of a radio frequency connector, a cavity, a cover plate, a plurality of resonator units and a frequency tuning and coupling strength adjusting assembly, wherein the resonance frequencies of the plurality of resonator units are distributed in the range of a passband, and the cavity filter has a blocking function on signals outside the resonance frequencies, so that the function of selecting microwave transmission signals is realized; the cavity filter has the advantages of reliable structure, wide filter frequency band, parasitic passband away from a channel, high Q value, stable electrical performance, good heat dissipation performance and the like.

The inventor of the application finds that in long-term research and development work, the existing cavity filter is large in size, and in order to improve the performances such as out-of-band rejection and the like, coupling zero points are usually formed between non-cascade filter cavities, but the variety of filter materials is increased, the complexity is improved, and the cost is high.

Disclosure of Invention

The technical problem that this application mainly solves is to provide a wave filter and communications facilities to improve the material uniformity of wave filter, reduce the volume of wave filter, practice thrift the cost.

In order to solve the technical problems, one technical scheme adopted by the application is as follows: a filter is provided. The filter includes: a housing having a first direction and a second direction perpendicular to each other; ten filter cavities are arranged on the shell, are sequentially coupled along a main coupling path, and are respectively coupled in a capacitive cross manner between a second filter cavity and a fourth filter cavity, between the fourth filter cavity and a sixth filter cavity, between the sixth filter cavity and an eighth filter cavity and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities so as to form three capacitive coupling zero points of the filter; the ten filter cavities are divided into three columns which are sequentially arranged along the second direction.

Optionally, the first filter cavity, the second filter cavity and the third filter cavity in the ten filter cavities are in a row and are sequentially arranged along the first direction; the fourth filter cavity, the sixth filter cavity, the eighth filter cavity and the tenth filter cavity in the ten filter cavities are arranged in a row and are sequentially arranged along the first direction; the fifth filter cavity, the seventh filter cavity and the ninth filter cavity in the ten filter cavities are arranged in a row and are sequentially arranged along the first direction; a projection of a center of the third filter cavity in the first direction is located between a center of the fourth filter cavity and a projection of a center of the sixth filter cavity in the first direction, and a projection of a center of the sixth filter cavity in the first direction is located between a center of the fifth filter cavity and a projection of a center of the seventh filter cavity in the first direction. Ten filter cavities are arranged in three rows, and the three rows of filter cavities are arranged in a staggered mode, so that the filter is regular in cavity arrangement, and convenient to process and reduce the size of the filter.

Optionally, the ten filter cavities are sequentially and adjacently arranged along the main coupling path, a first window is arranged between any group of adjacently arranged filter cavities, and each first window is provided with an adjusting rod and a metal coupling rib. Electromagnetic energy transmission and adjustment between adjacently arranged filter cavities can be realized, and signal coupling strength between adjacently arranged filter cavities is enhanced.

Optionally, fly rods are respectively arranged between the second filter cavity and the fourth filter cavity of the ten filter cavities, between the fourth filter cavity and the sixth filter cavity of the ten filter cavities, between the sixth filter cavity and the eighth filter cavity of the ten filter cavities and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities. Four low-end coupling zero points of the filter are realized, and the stop band inhibition performance of the filter is improved.

Optionally, the flying lever includes a first coupling part, a second coupling part and a connecting part, and two ends of the connecting part are respectively connected with the first coupling part and the second coupling part; the first coupling part and the second coupling part are arranged in a disc shape. The flying lever has simple structure and simple processing, and can save cost.

Optionally, the filter further comprises a low pass filter module coupled to a tenth filter cavity of the ten filter cavities. The low-pass filtering module is used for carrying out low-pass filtering on the electromagnetic signals of the filter so as to obtain low-frequency signals.

Optionally, the filter cavity is provided with: the resonance rod comprises a side wall and a hollow inner cavity formed by the side wall; and one end of the tuning rod is arranged in the hollow inner cavity. The resonant frequency of the resonant cavity can be adjusted by adjusting the depth of the tuning rod within the hollow interior cavity.

Optionally, the side wall comprises a first U-shaped side wall, a second U-shaped side wall and a third U-shaped side wall, and two ends of the second U-shaped side wall are respectively connected with one end of the first U-shaped side wall and one end of the third U-shaped side wall; the opening direction of the second U-shaped side wall is opposite to the opening direction of the first U-shaped side wall and the opening direction of the third U-shaped side wall. This structure can form a tray structure at both ends of the sidewall 210, and the tray structure at both ends of the sidewall 210 can increase the signal coupling amount of the resonant lever 20.

Optionally, the frequency band of the filter is 924 MHz-961 MHz.

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

The beneficial effects of this application are: unlike the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; ten filter cavities are arranged on the shell, are sequentially coupled along a main coupling path, and are respectively and capacitively coupled in a cross manner between a second filter cavity and a fourth filter cavity, between the fourth filter cavity and a sixth filter cavity, between the sixth filter cavity and an eighth filter cavity and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities so as to form four capacitive coupling zeros of the filter; wherein, ten filter cavities divide into three columns that arrange in proper order along the second direction. The filter can realize four capacitive coupling zero points and can ensure the out-of-band rejection and other performances of the filter; the four coupling zero points are the same in type and can be realized by adopting the same materials, so that the material consistency of the filter can be improved, the process is simplified, and the cost is saved; meanwhile, ten filter cavities are divided into three rows which are sequentially distributed along the second direction, so that the filter is regular in cavity arrangement, oversized filters in the first direction and the second direction can be avoided, the size of the filters is reduced, and cost is saved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed 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 that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

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

FIG. 2 is a schematic diagram of the topology of the filter of the embodiment of FIG. 1;

FIG. 3 is a schematic view of the combined structure of tuning rods, resonating rods and mounting posts in the filter of the embodiment of FIG. 1;

FIG. 4 is a schematic structural diagram of a combination structure of a fly rod and a fixing base in the filter of the embodiment of FIG. 1;

FIG. 5 is a schematic diagram of an equivalent circuit configuration of the filter of the embodiment of FIG. 1;

FIG. 6 is a schematic diagram of a simulated structure of the filter of the embodiment of FIG. 1;

fig. 7 is a schematic structural diagram of an embodiment of the communication device of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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

The present application first proposes a filter, as shown in fig. 1 to 6, fig. 1 is a schematic structural diagram of an embodiment of the filter of the present application; FIG. 2 is a schematic diagram of the topology of the filter of the embodiment of FIG. 1; FIG. 3 is a schematic view of the combined structure of tuning rods, resonating rods and mounting posts in the filter of the embodiment of FIG. 1; FIG. 4 is a schematic structural diagram of a combination structure of a fly rod and a fixing base in the filter of the embodiment of FIG. 1; FIG. 5 is a schematic diagram of an equivalent circuit configuration of the filter of the embodiment of FIG. 1; fig. 6 is a schematic diagram of a simulation structure of the filter of the embodiment of fig. 1. The filter 10 of the present embodiment includes: a housing 11 and tenth filter cavities A1-a10, wherein the housing 11 has a first direction x and a second direction y perpendicular to each other; ten filter cavities A1-a10 are provided on the housing 11, the ten filter cavities A1-a10 being coupled in sequence along a main coupling path and being capacitively cross-coupled between the second filter cavity A2 and the fourth filter cavity A4, between the fourth filter cavity A4 and the sixth filter cavity A6, between the sixth filter cavity A6 and the eighth filter cavity A8, and between the eighth filter cavity A8 and the tenth filter cavity a10, respectively, to form four capacitively coupled zeros of the filter 10.

Wherein ten filter cavities A1-a10 comprise: the filter comprises a first filter cavity A1, a second filter cavity A2, a third filter cavity A3, a fourth filter cavity A4, a fifth filter cavity A5, a sixth filter cavity A6, a seventh filter cavity A7, an eighth filter cavity A8, a ninth filter cavity A9 and a tenth filter cavity A10.

The filtering cavity is a communication device for selecting frequencies and suppressing signals, and mainly plays a role of frequency control, and all communication devices related to frequency transmission and reception need the filtering cavity.

Compared with the prior art, the filter 10 of the embodiment of the application can realize four capacitive coupling zero points and can ensure the out-of-band rejection and other performances of the filter 10; the four coupling zero points are the same in type and can be realized by adopting the same materials, so that the material consistency of the filter 10 can be improved, the process is simplified, and the cost is saved; meanwhile, the ten filter cavities A1-A10 are divided into three rows which are sequentially arranged along the second direction y, so that the filter 10 is regularly arranged, the filter 10 can be prevented from being oversized in the first direction x and the second direction y, the size of the filter 10 is reduced, and the cost is saved.

Optionally, as shown in fig. 1, a first filtering cavity A1, a second filtering cavity A2 and a third filtering cavity A3 of the ten filtering cavities A1-a10 are in a row and are sequentially arranged along a first direction x; the fourth filtering cavity A4, the sixth filtering cavity A6, the eighth filtering cavity A8 and the tenth filtering cavity A10 are arranged in a row and are sequentially arranged along the first direction x; the fifth filtering cavity A5, the seventh filtering cavity A7 and the ninth filtering cavity A9 are divided into a row and are sequentially distributed along the first direction x; the projection of the center of the third filter cavity A3 in the first direction x is located between the center of the fourth filter cavity A4 and the projection of the center of the sixth filter cavity A6 in the first direction x, and the projection of the center of the sixth filter cavity A6 in the first direction x is located between the center of the fifth filter cavity A5 and the projection of the center of the seventh filter cavity A7 in the first direction x.

From the above analysis, the ten filter cavities A1-a10 are arranged in three rows, and the three rows of filter cavities are staggered, so that the filter 10 has regular cavity arrangement, and is convenient to process and reduce the volume.

As shown in fig. 1 and 3, resonance rods 20 and tuning rods 30 are arranged in the ten filter cavities A1-a 10; the resonant rod 20 includes a side wall 210 and a hollow cavity 220 formed by the side wall 210, and one end of the tuning rod 30 is disposed in the hollow cavity 220; the resonant frequency of the resonant cavity can be adjusted by adjusting the depth of tuning rod 30 within hollow interior 220.

The resonant rod 20, the hollow cavity 220, and the tuning rod 30 of the present embodiment are coaxially disposed.

Optionally, as shown in fig. 3, the side wall 210 includes a first U-shaped side wall 211, a second U-shaped side wall 212, and a third U-shaped side wall 213, where two ends of the second U-shaped side wall 212 are connected to one end of the first U-shaped side wall 211 and one end of the third U-shaped side wall 213, respectively; wherein, the opening direction of the second U-shaped side wall 212 is opposite to the opening direction of the first U-shaped side wall 211 and the opening direction of the third U-shaped side wall 213; the second U-shaped sidewall 212 forms a hollow interior 220. This structure enables a tray structure to be formed at both ends of the side wall 210.

The flip-flop structure at both ends of the sidewall 210 can increase the signal coupling amount of the resonant lever 20.

Alternatively, the ten filter cavities A1 to a10 of the present embodiment may be metal filter cavities, and the resonant rod 20 may be a metal resonant rod.

The material of the resonant rod 20 of this embodiment may be a cut 1215MS. Of course, in other embodiments, the resonant rod may be a screw of M8 or M4, and made of copper or silver.

The ten filter cavities A1-A10 have the same size, so that the production is convenient, and the cost is saved. The ten filter cavities A1-a10 may have a radius of less than 39mm, e.g. 38mm, 37mm, 36mm etc.

Optionally, as shown in fig. 1 and 3, a mounting post 40 is further provided on the housing 11, and the side wall 210 is fixed to the mounting post 40. The resonant lever 20 is fixed to the housing 11 by a mounting post 40.

Further, a mounting hole (not shown) may be provided in the bottom of the second U-shaped sidewall 212, one end of the mounting post 40 is fixed to the housing 11, and the other end of the mounting post 40 is mounted in the mounting hole to fix the resonant rod 20 to the mounting post 40; the mounting holes may be through holes, the mounting holes may be threaded holes, and the mounting posts 40 may be studs. In other embodiments, the mounting hole may also be a blind hole.

Further, the filter 10 further includes a cover plate (not shown) covering the ten filter cavities A1-a10, and the other end of the tuning rod 30 is penetrated through the cover plate, wherein the tuning rod 30 may be a metal screw.

Optionally, as shown in fig. 1, ten filter cavities A1-a10 are sequentially and adjacently arranged along a main coupling path, and a first window (the reference sign of the drawing) is arranged between any group of adjacently arranged filter cavities, that is, a first window is arranged between two adjacent (i.e., cascade-arranged) filter cavities sequentially arranged along the main coupling path, and electromagnetic energy is transferred between the two adjacent filter cavities on the main coupling path through the first window. For example, first windows are provided between the first filter chamber A1 and the second filter chamber A2, between the second filter chamber A2 and the third filter chamber A3, between the third filter chamber A3 and the fourth filter chamber A4, between the fourth filter chamber A4 and the fifth filter chamber A5, between the fifth filter chamber A5 and the sixth filter chamber A6, between the sixth filter chamber A6 and the seventh filter chamber A7, between the seventh filter chamber A7 and the eighth filter chamber A8, between the eighth filter chamber A8 and the ninth filter chamber A9, and between the ninth filter chamber A9 and the tenth filter chamber a10, respectively.

The filter 10 of the present embodiment further includes a plurality of adjustment rods 50 and a plurality of metal coupling ribs 80.

In order to adjust the coupling strength between two adjacent filter cavities on the main coupling path, an adjusting rod 50 may be provided at each first window, for example, a first window between the first filter cavity A1 and the second filter cavity A2, a first window between the second filter cavity A2 and the third filter cavity A3, a first window between the third filter cavity A3 and the fourth filter cavity A4, a first window between the fourth filter cavity A4 and the fifth filter cavity A5, a first window between the fifth filter cavity A5 and the sixth filter cavity A6, a first window between the sixth filter cavity A6 and the seventh filter cavity A7, a first window between the seventh filter cavity A7 and the eighth filter cavity A8, a first window between the eighth filter cavity A8 and the ninth filter cavity A9, and a first window between the ninth filter cavity A9 and the tenth filter cavity a10, respectively.

In order to improve the coupling strength between two adjacent filter cavities on the main coupling path, a metal coupling rib 80 may be disposed at a first window, for example, a first window between the first filter cavity A1 and the second filter cavity A2, a first window between the second filter cavity A2 and the third filter cavity A3, a first window between the third filter cavity A3 and the fourth filter cavity A4, a first window between the fourth filter cavity A4 and the fifth filter cavity A5, a first window between the fifth filter cavity A5 and the sixth filter cavity A6, a first window between the sixth filter cavity A6 and the seventh filter cavity A7, a first window between the seventh filter cavity A7 and the eighth filter cavity A8, a first window between the eighth filter cavity A8 and the ninth filter cavity A9, and a first window between the ninth filter cavity A9 and the tenth filter cavity a10, respectively.

As shown in fig. 1 and 2, the second filter cavity A2 and the fourth filter cavity A4, the fourth filter cavity A4 and the sixth filter cavity A6, the sixth filter cavity A6 and the eighth filter cavity A8, and the eighth filter cavity A8 and the tenth filter cavity a10 are respectively capacitively coupled in a cross manner, so that four capacitive coupling zeros of the filter 10 are formed, four low-end coupling zeros of the filter 10 are realized, and the stop band rejection performance of the filter 10 is improved.

The coupling zero is also called transmission zero. The transmission zero point is that the transmission function of the filter is equal to zero, namely electromagnetic energy cannot pass through the network on a frequency point corresponding to the transmission zero point, so that the full isolation function is achieved, the inhibition function is achieved on signals outside the pass bands, and the high isolation among a plurality of pass bands can be better achieved.

As shown in fig. 1 and 2, the present embodiment may provide flying bars 60 (which may be equivalent to capacitances) between the second filter cavity A2 and the fourth filter cavity A4, between the fourth filter cavity A4 and the sixth filter cavity A6, between the sixth filter cavity A6 and the eighth filter cavity A8, and between the eighth filter cavity A8 and the tenth filter cavity a10, respectively, to achieve capacitive cross-coupling between the second filter cavity A2 and the fourth filter cavity A4, between the fourth filter cavity A4 and the sixth filter cavity A6, between the sixth filter cavity A6 and the eighth filter cavity A8, and between the eighth filter cavity A8 and the tenth filter cavity a10, respectively.

Optionally, as shown in fig. 1 and 4, the flying lever 60 of the present embodiment includes: the first coupling part 610, the second coupling part 620 and the connecting part 630, and both ends of the connecting part 630 are respectively connected with the first coupling part 610 and the second coupling part 620; the first coupling portion 610 is coupled to the resonant rod 20 in the second filter cavity A2 such that a coupling capacitance is formed between the first coupling portion 610 and the resonant rod 20, and the second coupling portion 620 is coupled to the resonant rod 20 in the fourth filter cavity A4 such that a coupling capacitance is formed between the second coupling portion 620 and the resonant rod 20.

Wherein, the first coupling portion 610 and the second coupling portion 620 of the present embodiment are both disc-shaped. The flying lever 60 of the embodiment has a simple structure, is simple to process, and can save cost.

As shown in fig. 1 and 4, the filter 10 further includes: the fixing base 70 is disposed on the housing 11, and the fixing base 70 is provided with a through hole (not shown), through which the connection portion 630 penetrates to fix the flying lever 60 and the fixing base 70.

The flying lever 60 of the present embodiment may be implemented by a metal probe, and the fixing base 70 is implemented by PTFE or engineering plastic.

Further, as shown in fig. 1, the filter 10 of the present embodiment further includes: an input port 12 and an output port 13, the input port 12 being connected to the first filter cavity A1 of the filter 10, the output port 13 being coupled to the tenth filter cavity a10 of the filter 10.

The input port 12 and the output port 13 are taps, and the input port 12 is connected with a resonant rod 20 in the first filter cavity A1 to input electromagnetic signals into the first filter cavity A1; the output port 13 is connected to the resonance rod 20 in the tenth filter chamber a10, and outputs the electromagnetic signal in the tenth filter chamber a10.

As shown in fig. 5, the equivalent circuit of the filter 10 of the present embodiment has an impedance Z1 at the input port 12 of about 50 ohms and an impedance Z2 at the output port 13 of about 50 ohms; to ensure that electromagnetic signals are transmitted between the filter cavities A1-a10 of the filter 10, impedance adjusters ZV are provided between the input port 12 and the first filter cavity A1, between adjacent filter cavities on the main coupling path, between non-cascaded filter cavities forming cross coupling, and between the tenth filter cavity a10 and the output port 13 to achieve impedance matching.

As shown in fig. 6, the simulation result of the filter 10 of the present embodiment shows that the frequency band of the filter 10 of the present embodiment is about 924MHz to 761MHz, the frequency band curve is shown as S1, and the frequency band curve has a low-side coupling zero point: a. b, c (partial coupling zero overlap); the suppression of the frequency point 925MHz (m 1) is-1.347 dB, and the suppression of the frequency point 960MHz (m 2) is-0.895 dB, so that the filter 10 has the characteristic of small in-band loss (less than 1.8 dB); and the suppression of the frequency point 915MHz (m 3) is-111.315 dB, and the suppression of the frequency point 970MHz (m 4) is-30.674 dB, so that the filter 10 has the performance of strong anti-interference capability (the suppression of 10MHz outside a passband is greater than 105dB, and the suppression of 10GHz frequency band is greater than 20 dB).

Optionally, the filter 10 of the present embodiment further includes a low-pass filtering module 120, and the low-pass filtering module 120 is coupled to the tenth filtering cavity a10. The low-pass filtering module 120 is configured to perform low-pass filtering on the electromagnetic signal of the filter 10 to obtain a low-frequency signal.

The low-pass filtering module 120 includes a plurality of low-pass filtering units (not shown) arranged in series.

The filter 10 of the embodiment is a 10-order microwave filter applied to a 5G mobile communication system, the working frequency band of the filter is 924 MHz-761 MHz, and the filter has the characteristics of small in-band loss (less than 1.8 dB), strong anti-interference capability (10 MHz outside a passband is greater than 105dB inhibition, 10GHz frequency band inhibition is greater than 20 dB), and large power capacity (normal temperature and normal pressure bearing power is greater than 2000W).

The filter has small loss, and can ensure low energy consumption of the communication module; the filter is designed by combining 10-order filter cavities, and a coupling zero structure is introduced, so that the filter has strong anti-interference capability and can ensure that a communication system is not interfered by stray signals; the filter has simple design scheme, low cost and good structure and electrical property stability; the filter can meet the requirement of the current latest 5G mobile communication system, and mainly relates to the 900MHz frequency band.

The application further proposes a communication device, as shown in fig. 7, and fig. 7 is a schematic structural diagram of an embodiment of the communication device of the application. The communication device of the present embodiment includes an antenna 32 and a radio frequency unit 31 connected to the antenna 32, the radio frequency unit 31 including the filter 10 as in the above-described embodiment, the filter 10 being configured to filter radio frequency signals.

In other embodiments, the rf unit 31 may also be integrally provided with the antenna 32, forming an active antenna unit (Active Antenna Unit, AAU).

Unlike the prior art, the filter of the embodiment of the application comprises: a housing having a first direction and a second direction perpendicular to each other; ten filter cavities are arranged on the shell, are sequentially coupled along a main coupling path, and are respectively and capacitively coupled in a cross manner between a second filter cavity and a fourth filter cavity, between the fourth filter cavity and a sixth filter cavity, between the sixth filter cavity and an eighth filter cavity and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities so as to form four capacitive coupling zeros of the filter; wherein, ten filter cavities divide into three columns that arrange in proper order along the second direction. The filter can realize four capacitive coupling zero points and can ensure the out-of-band rejection and other performances of the filter; the four coupling zero points are the same in type and can be realized by adopting the same materials, so that the material consistency of the filter can be improved, the process is simplified, and the cost is saved; meanwhile, ten filter cavities are divided into three rows which are sequentially distributed along the second direction, so that the filter is regular in cavity arrangement, oversized filters in the first direction and the second direction can be avoided, the size of the filters is reduced, and cost is saved.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims

1. A filter, the filter comprising:

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

ten filter cavities are arranged on the shell, are sequentially coupled along a main coupling path, and are respectively coupled in a capacitive cross manner between a second filter cavity and a fourth filter cavity, between the fourth filter cavity and a sixth filter cavity, between the sixth filter cavity and an eighth filter cavity and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities so as to form four capacitive coupling zero points of the filter;

the ten filter cavities are divided into three columns which are sequentially arranged along the second direction;

the first filter cavity, the second filter cavity and the third filter cavity in the ten filter cavities are arranged in a row and are sequentially arranged along the first direction;

the fourth filter cavity, the sixth filter cavity, the eighth filter cavity and the tenth filter cavity in the ten filter cavities are arranged in a row and are sequentially arranged along the first direction;

the fifth filter cavity, the seventh filter cavity and the ninth filter cavity in the ten filter cavities are arranged in a row and are sequentially arranged along the first direction;

a projection of a center of the third filter cavity in the first direction is located between a center of the fourth filter cavity and a projection of a center of the sixth filter cavity in the first direction, and a projection of a center of the sixth filter cavity in the first direction is located between a center of the fifth filter cavity and a projection of a center of the seventh filter cavity in the first direction;

fly rods are respectively arranged between the second filter cavity and the fourth filter cavity of the ten filter cavities, between the fourth filter cavity and the sixth filter cavity of the ten filter cavities, between the sixth filter cavity and the eighth filter cavity of the ten filter cavities and between the eighth filter cavity and the tenth filter cavity of the ten filter cavities;

the flying lever comprises a first coupling part, a second coupling part and a connecting part, wherein two ends of the connecting part are respectively connected with the first coupling part and the second coupling part; the first coupling part and the second coupling part are arranged in a disc shape;

the filter further includes: the fixing seat is arranged on the shell, the fixing seat is provided with a through hole, and the connecting part penetrates through the through hole to fix the flying rod and the fixing seat;

the ten filter cavities are sequentially and adjacently arranged along the main coupling path, a first window is arranged between any group of adjacently arranged filter cavities, and each first window is provided with an adjusting rod and a metal coupling rib;

the filter further comprises a low pass filter module coupled to a tenth filter cavity of the ten filter cavities;

the frequency band of the filter is 924 MHz-961 MHz.

2. The filter of claim 1, wherein the filter is configured to filter the filter,

the filter cavity is internally provided with:

the resonance rod comprises a side wall and a hollow inner cavity formed by the side wall;

and one end of the tuning rod is arranged in the hollow inner cavity.

3. A filter according to claim 2, wherein,

the side walls comprise a first U-shaped side wall, a second U-shaped side wall and a third U-shaped side wall, and two ends of the second U-shaped side wall are respectively connected with one end of the first U-shaped side wall and one end of the third U-shaped side wall; the opening direction of the second U-shaped side wall is opposite to the opening direction of the first U-shaped side wall and the opening direction of the third U-shaped side wall.

4. A communication device comprising an antenna and a radio frequency unit connected to the antenna, the radio frequency unit comprising a filter according to any of claims 1-3 for filtering radio frequency signals.