CN113540721B - Filter and communication equipment - Google Patents

Filter and communication equipment Download PDF

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Publication number
CN113540721B
CN113540721B CN202010308115.2A CN202010308115A CN113540721B CN 113540721 B CN113540721 B CN 113540721B CN 202010308115 A CN202010308115 A CN 202010308115A CN 113540721 B CN113540721 B CN 113540721B
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filter
cavity
filtering
branch
coupling
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CN113540721A (en
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张宝真
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Anhui Tatfook Technology Co Ltd
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Anhui Tatfook Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM

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  • Computer Networks & Wireless Communication (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The application discloses filter and communication equipment, this filter includes: a housing; the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, the first filtering cavity and the third filtering cavity of the filtering branch are inductively and cross-coupled, and the third filtering cavity and the fifth filtering cavity, the fifth filtering cavity and the eighth filtering cavity, and the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively and capacitively cross-coupled so as to form four cross-coupling zero points of the filtering branch; wherein the bandwidth of the filter ranges from 2515MHz to 2675MHz. In this way, the stop band rejection performance of the filter can be improved.

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, a plurality of filtering cavities in the existing cavity filter are arranged in a complex and irregular manner, the size of the filter is increased, and the stop band inhibition performance of the cavity filter is poor.
Disclosure of Invention
The application provides a filter and communication equipment, so as to improve the stop band inhibition performance of the filter.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: there is provided a filter comprising: a housing; the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, the first filtering cavity and the third filtering cavity of the filtering branch are inductively and cross-coupled, and the third filtering cavity and the fifth filtering cavity, the fifth filtering cavity and the eighth filtering cavity, and the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively and capacitively cross-coupled so as to form four cross-coupling zero points of the filtering branch; wherein the bandwidth of the filter ranges from 2515MHz to 2675MHz.
Optionally, a first window is arranged in the first filtering cavity and the third filtering cavity of the filtering branch; and capacitive coupling components are arranged between the third filter cavity and the fifth filter cavity, between the fifth filter cavity and the eighth filter cavity and between the sixth filter cavity and the eighth filter cavity of the filter branch.
Optionally, the capacitive coupling component comprises a supporting card seat and a coupling probe, wherein the coupling probe is fixed on the supporting card seat, and the supporting card seat is arranged at a window between a third filtering cavity and a fifth filtering cavity, between the fifth filtering cavity and an eighth filtering cavity and between a sixth filtering cavity and an eighth filtering cavity of the filtering branch. Capacitive cross-coupling may be achieved by a capacitive coupling component.
Optionally, the eight filter cavities of the filter branch are sequentially window-coupled, and a second window is arranged between the two sequentially-coupled filter cavities of the filter branch. The cost of the filter is reduced by pure window coupling between two adjacent filter cavities on the coupling path of the filter branch.
Optionally, the first window and the second window are both provided with a first tuning rod for adjusting coupling strength.
Optionally, reinforcing ribs are respectively arranged between the third filtering cavity and the fourth filtering cavity, between the fourth filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the sixth filtering cavity, between the sixth filtering cavity and the seventh filtering cavity, and between the seventh filtering cavity and the eighth filtering cavity of the filtering branch. The coupling strength between the third filtering cavity and the fourth filtering cavity, between the fourth filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the sixth filtering cavity, between the sixth filtering cavity and the seventh filtering cavity and between the seventh filtering cavity and the eighth filtering cavity can be improved through the reinforcing ribs, so that energy loss is reduced, and energy transmission quality is improved.
Optionally, the eight filter cavities of the filter branch are divided into two columns arranged along the second direction, and the second direction is perpendicular to the first direction; the first filter cavity, the fourth filter cavity, the sixth filter cavity and the seventh filter cavity of the filter branch are arranged in a row and are sequentially arranged along the first direction; the second filter cavity, the third filter cavity, the fifth filter cavity and the eighth filter cavity of the filter branch are arranged in a row and are sequentially distributed along the first direction. Eight filter cavities are divided into two rows which are sequentially arranged along the second direction, and the eight filter cavities are regularly arranged, so that the volume of a filter branch is reduced, and the volume of a filter is further reduced.
Optionally, each of the filter cavities is provided with: the resonant rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall; one end of the second tuning rod is arranged in the hollow inner cavity; the shell is also provided with a mounting column, and the U-shaped side wall is fixed on the mounting column; the two ends of the U-shaped side wall bend and extend towards the direction deviating from the hollow inner cavity so as to form a disc-shaped structure at the two ends of the U-shaped side wall, and the disc-shaped structure is arranged in parallel with the bottom of the U-shaped side wall. The disk-like structures at the two ends of the U-shaped side wall can increase the signal coupling amount of the resonant rod. The resonant rod can be fixed on the shell through the mounting column, and the resonant frequency of the resonant cavity can be adjusted by adjusting the depth of the tuning rod in the hollow inner cavity.
The filter further includes: the first port is connected with a first filtering cavity of the filtering branch; and the second port is connected with the eighth filter cavity of the filter branch.
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: the shell is provided with a first direction and a second direction which are mutually perpendicular; the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, the first filtering cavity and the third filtering cavity of the filtering branch are inductively and cross-coupled, and the third filtering cavity and the fifth filtering cavity, the fifth filtering cavity and the eighth filtering cavity, and the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively and capacitively cross-coupled so as to form four cross-coupling zero points of the filtering branch; wherein the bandwidth of the filter ranges from 2515MHz to 2675MHz. The inductive cross coupling between the first filtering cavity and the third filtering cavity of the filtering branch can well control the high-end inhibition of the bandwidth of the filtering branch to obtain better high-end inhibition of the bandwidth, and the capacitive cross coupling between the third filtering cavity and the fifth filtering cavity, between the fifth filtering cavity and the eighth filtering cavity and between the sixth filtering cavity and the eighth filtering cavity of the filtering branch can realize three capacitive coupling zero points, so that the low-end inhibition of the bandwidth of the filter can be well controlled to obtain better low-end inhibition of the bandwidth, and therefore, the stop band inhibition performance of the filter can be improved; in addition, the bandwidth of the filtering branch is 2515MHz-2675MHz, so that the bandwidth of the filtering branch can be accurately controlled.
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 diagram of the capacitive coupling assembly of the filter of the embodiment of FIG. 1;
FIG. 4 is a schematic structural diagram of a second tuning rod, resonating rod and mounting post combination of the filter cavity 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, please refer to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a first embodiment of the filter of the present application, and fig. 2 is a schematic topological structure of the filter of the embodiment of fig. 1. The filter 10 of the present embodiment includes: a housing 11 and eight filter cavities; the filter branch 12 is arranged on the housing 11 and consists of eight filter cavities coupled in sequence.
Specifically, the eight filter cavities of the filter branch 12 include: a first filtering cavity A1, a second filtering cavity A2, a third filtering cavity A3, a fourth filtering cavity A4, a fifth filtering cavity A5, a sixth filtering cavity A6, a seventh filtering cavity A7 and an eighth filtering cavity A8; inductive cross coupling is performed between the first filtering cavity A1 and the third filtering cavity A3 of the filtering branch 12, and capacitive cross coupling is performed between the third filtering cavity A3 and the fifth filtering cavity A5, between the fifth filtering cavity A5 and the eighth filtering cavity A8, and between the sixth filtering cavity A6 and the eighth filtering cavity A8 of the filtering branch 12; wherein the bandwidth of the filter 10 ranges from 2515MHz to 2675MHz.
As can be seen, the first filtering cavity A1 and the third filtering cavity A3 of the filtering branch 12 are inductively cross-coupled, so that the high-end suppression of the bandwidth of the filtering branch 12 can be well controlled, and a better high-end suppression of the bandwidth is obtained, and the third filtering cavity A3 and the fifth filtering cavity A5 and the eighth filtering cavity A8 of the filtering branch 12 are respectively capacitively cross-coupled, so that three capacitive coupling zero points can be realized, and the low-end suppression of the bandwidth of the filtering branch 12 can be well controlled, so as to obtain a better low-end suppression of the bandwidth, thereby improving the stop band suppression performance of the filter 10; in addition, the bandwidth of the filtering branch 12 ranges from 2515MHz to 2675MHz, so that the bandwidth of the filtering branch 12 can be accurately controlled.
Optionally, as shown in fig. 1, the eight filter cavities of the filter branch 12 are divided into two columns arranged along a second direction y, and the second direction y is perpendicular to the first direction x; the first filtering cavity A1, the fourth filtering cavity A4, the sixth filtering cavity A6 and the seventh filtering cavity A7 of the filtering branch 12 are arranged in a row and are sequentially arranged along the first direction x; the second filter cavity A2, the third filter cavity A3, the fifth filter cavity A5 and the eighth filter cavity A8 of the filter branch 12 are arranged in a row and are sequentially arranged along the first direction x.
It can be seen that the eight filter cavities are divided into two rows sequentially arranged along the second direction y, and the eight filter cavities are regularly arranged, so that the volume of the filter branch 12 is reduced, and the volume of the filter 10 is further reduced.
Optionally, the first filtering cavity A1 and the third filtering cavity A3 of the filtering branch 12 are provided with a first window; capacitive coupling components are arranged between the third filter cavity A3 and the fifth filter cavity A5, between the fifth filter cavity A5 and the eighth filter cavity A8 and between the sixth filter cavity A6 and the eighth filter cavity A8 of the filter branch 12.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a capacitive coupling component in the filter of the embodiment of fig. 1. Optionally, the capacitive coupling assembly includes a support holder 70 and a coupling probe 60, where the coupling probe 60 is fixed on the support holder 70, and the support holder 70 is disposed at windows between the third filtering cavity A3 and the fifth filtering cavity A5, between the fifth filtering cavity A5 and the eighth filtering cavity A8, and between the sixth filtering cavity A6 and the eighth filtering cavity A8 of the filtering branch 12. Capacitive cross-coupling may be achieved by a capacitive coupling component.
Specifically, the coupling probe 60 includes a first coupling portion 610, a second coupling portion 620, and a connection portion 630, two ends of the connection portion 630 are respectively connected to the first coupling portion 610 and the second coupling portion 620, and the first coupling portion 610 and the second coupling portion 620 are located on the same side of the connection portion 630. The first coupling part 610, the connection part 630, and the second coupling part 620 are sequentially connected to form the coupling probe 60; the first coupling portion 610 is coupled to the resonant rod 20 in the third filter cavity A3, so as to form a coupling capacitance 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 sixth filter cavity A6, so as to form a coupling capacitance between the second coupling portion 620 and the resonant rod 20.
As shown in fig. 1 and 3, the support holder 70 may be disposed on the housing 11, and the support holder 70 is provided with a through hole (not shown), wherein the connection portion 630 penetrates the through hole to fix the coupling probe 60 to the support holder 70.
The coupling probe 60 of this embodiment may be implemented as a metal probe, and the fixing base is implemented as PTFE or engineering plastic.
Optionally, as shown in fig. 1, eight filter cavities of the filter branch 12 are sequentially window-coupled, and a second window is disposed between two filter cavities of the filter branch 12 that are sequentially coupled. Namely, a second window is arranged between the first filter cavity A1 and the second filter cavity A2, a second window is arranged between the second filter cavity A2 and the third filter cavity A3, a second window is arranged between the third filter cavity A3 and the fourth filter cavity A4, a second window is arranged between the fourth filter cavity A4 and the fifth filter cavity A5, a second window is arranged between the fifth filter cavity A5 and the sixth filter cavity A6, a second window is arranged between the sixth filter cavity A6 and the seventh filter cavity A7, and a second window is arranged between the seventh filter cavity A7 and the eighth filter cavity A8.
Optionally, reinforcing ribs 80 are respectively disposed between the third filtering cavity A3 and the fourth filtering cavity A4, between the fourth filtering cavity A4 and the fifth filtering cavity A5, between the fifth filtering cavity A5 and the sixth filtering cavity A6, between the sixth filtering cavity A6 and the seventh filtering cavity A7, and between the seventh filtering cavity A7 and the eighth filtering cavity A8 of the filtering branch 12.
It can be seen that the coupling between two adjacent filter cavities on the coupling path of the filter branch 12 is pure window coupling, so that the cost of the filter 10 is reduced, and the coupling strength between the third filter cavity A3 and the fourth filter cavity A4, between the fourth filter cavity A4 and the fifth filter cavity A5, between the fifth filter cavity A5 and the sixth filter cavity A6, between the sixth filter cavity A6 and the seventh filter cavity A7, and between the seventh filter cavity A7 and the eighth filter cavity A8 on the coupling path of the filter branch 12 is improved by the reinforcing rib 80.
Optionally, the first window and the second window are each provided with a first tuning rod 31 for adjusting the coupling strength, in particular, the first tuning rod 31 may be used for adjusting the coupling bandwidths of the first filter cavity A1 and the third filter cavity A3. Electromagnetic energy transfer can be performed between two adjacent filter cavities on the coupling path of the filter branch 12 through a window, and the coupling bandwidth can be adjusted by the first tuning rod 31.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a second tuning rod, resonant rod and mounting post combined structure of the filtering cavity of the embodiment of fig. 1. Optionally, each filter cavity is provided with: a resonant rod 20 comprising a U-shaped sidewall 210 and a hollow interior 220 formed by the U-shaped sidewall 210; a second tuning rod 30, one end of the second tuning rod 30 being disposed within the hollow interior 220; wherein, the two ends of the U-shaped sidewall 210 bend and extend in a direction away from the hollow cavity 220, so as to form a disc-shaped structure 230 at the two ends of the U-shaped sidewall 210 and parallel to the bottom of the U-shaped sidewall 210. The housing 11 is further provided with a mounting post 40, the U-shaped side wall 210 is fixed to the mounting post 40, and the resonance rod 20 is fixed to the housing 11 through the mounting post 40.
The resonant rod 20, the hollow cavity 220 and the second tuning rod 30 of the present embodiment are coaxially disposed.
Further, a mounting hole (not shown) may be provided in the bottom of the U-shaped sidewall 210, 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.
Alternatively, the eight filter cavities 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 20 may be a screw of M8 or M4, and may be made of copper or silver.
The eight filter cavities have the same size, so that the production is convenient, and the cost is saved. The radius of the eight filter cavities may be smaller than 21mm, e.g. 20mm, 19mm, 18mm, etc.
It will be appreciated that the resonant rod 20 may be secured to the housing 11 by the mounting post 40 and that the resonant frequency of the resonant cavity may be adjusted by adjusting the depth of the second tuning rod 30 within the hollow interior 220.
Further, the filter 10 further includes a cover plate (not shown) disposed over the eight filter cavities, and the other end of the second tuning rod 30 is disposed through the cover plate, wherein the second tuning rod 30 may be a metal screw.
As shown in fig. 2, the first filter cavity A1 and the third filter cavity A3 of the filter branch 12 are inductively coupled to form an inductive coupling zero L 1 The method comprises the steps of carrying out a first treatment on the surface of the The third filter cavity A3 and the fifth filter cavity A5 are in capacitive cross coupling to form a capacitive coupling zero point C 1 The method comprises the steps of carrying out a first treatment on the surface of the The fifth filter cavity A5 and the eighth filter cavity A8 are in capacitive cross coupling to form a capacitive coupling zero point C 2 The method comprises the steps of carrying out a first treatment on the surface of the The sixth filter cavity A6 and the eighth filter cavity A8 are in capacitive cross coupling to form a capacitive coupling zero point C 3 The method comprises the steps of carrying out a first treatment on the surface of the To form four cross-coupling zeroes for the filtering branch 12. Wherein the cross-coupling zero is also referred to as transmission zero. The transmission zero point is that the transmission function of the filter 10 is equal to zero, that is, electromagnetic energy cannot pass through the network at the frequency point corresponding to the transmission zero point, so that the full isolation function is achieved, the suppression function is achieved on signals outside the pass bands, and the high isolation among a plurality of pass bands can be better achieved.
The filter 10 further includes: a first port connected to the first filter cavity A1 of the filter branch 12; the second port is connected to the eighth filter cavity A8 of the filter branch 12.
As shown in fig. 5, the equivalent circuit of the filter 10 of the present embodiment has an impedance Z1 at the input port of about 50 ohms and an impedance Z2 at the output port of about 50 ohms; to ensure that electromagnetic signals are transmitted between the eight filter cavities of the filter 10, impedance adjusters ZV1 are required to be respectively disposed between the input port and the first filter cavity A1, between adjacent filter cavities on the coupling path, between non-cascaded filter cavities forming cross coupling, and between the eighth filter cavity A8 and the output port to achieve impedance matching.
The bandwidth range of the filter 10 of the present embodiment is: 2515MHz to 2675MHz. Specifically, the coupling bandwidth between the first port and the first filter cavity A1 ranges from 157Mhz to 179Mhz; the coupling bandwidth between the first filtering cavity A1 and the second filtering cavity A2 is in the range of 101Mhz-116Mhz; the coupling bandwidth between the first filtering cavity A1 and the third filtering cavity A3 is in the range of 72Mhz-84Mhz; the coupling bandwidth between the second filter cavity A2 and the third filter cavity A3 is in the range of 63Mhz-74Mhz; the coupling bandwidth between the third filter cavity A3 and the fourth filter cavity A4 is in the range of 74Mhz-87Mhz; the coupling bandwidth between the third filter cavity A3 and the fifth filter cavity A5 is in the range (-36) Mhz- (-28) Mhz; the coupling bandwidth between the fourth filter cavity A4 and the fifth filter cavity A5 is in the range of 71Mhz-83Mhz; the coupling bandwidth between the fifth filter cavity A5 and the sixth filter cavity A6 is in the range of 75Mhz-87Mhz; the coupling bandwidth range between the fifth filter cavity A5 and the eighth filter cavity A8 is (-31) Mhz- (-24) Mhz; the coupling bandwidth between the sixth filter cavity A6 and the seventh filter cavity A7 is in the range of 84Mhz-97Mhz; the coupling bandwidth between the sixth filter cavity A6 and the eighth filter cavity A8 is in the range (-69) Mhz- (-58) Mhz; the coupling bandwidth between the seventh filtering cavity A7 and the eighth filtering cavity A8 ranges from 106Mhz to 122Mhz; the coupling bandwidth between the eighth filter cavity A8 and the second port ranges from 157Mhz to 179Mhz, and the design requirement can be met.
Therefore, the resonance frequencies of the first to eighth filter cavities A1 to A8 of the filter 10 are located in the following ranges in order: 2592Mhz-2594Mhz, 2648Mhz-2650Mhz, 2586Mhz-2588Mhz, 2559Mhz-2561Mhz, 2593Mhz-2595Mhz, 2610Mhz-2612Mhz, 2546Mhz-2548Mhz, 2592Mhz-2594Mhz. Therefore, the resonant frequency of each resonant cavity is positioned in the designed bandwidth range, so that the convenience of manufacturing and debugging is improved; namely, the manufacturing is carried out by adopting similar specification parameters, and the required parameter range can be achieved by simple debugging in the actual process.
As shown in fig. 6, the simulation result of the filter 10 of the present embodiment shows that, as shown in fig. 6, the bandwidth of the filter 10 of the present embodiment is about 2515MHz to 2675MHz; as shown in the band curve S1, there are two low-end coupling zeros a, b and two high-end coupling zeros c, d in common; the filtering branch 12 has five cross-coupling zeros, but because the radio frequency parameters of the zeros are the same, some simulation points are the same, so three cross-coupling zeros are shown in the simulation. The suppression of the filter branch 12 at a frequency point 2.515GHz (m 11) is-1.333 dB, the suppression of the filter branch 12 at a frequency point 2.675GHz (m 12) is-1.064 dB, the suppression of the filter branch 12 at a frequency point 2.370GHz (m 13) is-57.313 dB, the suppression of the filter branch 12 at a frequency point 2.390GHz (m 14) is-53.986 dB, the suppression of the filter branch 12 at a frequency point 2.400GHz (m 15) is-52.239 dB, the suppression of the filter branch 12 at a frequency point 2.500GHz (m 16) is-44.625 dB, the suppression of the filter branch 12 at a frequency point 2.700GHz (m 17) is-48.440 dB, the suppression of the filter branch 12 at a frequency point 2.770GHz (m 18) is-77.904 dB, the suppression of the filter branch 12 at a frequency point 2.800GHz (m 19) is-66.100 dB, and the suppression of the filter branch 12 at a frequency point 2.820GHz (m 20) is-66.200, so that the design of out-of-band suppression requirements of the filter 10 can be satisfied.
The filter 10 of the embodiment is a 12-order microwave filter applied to a 5G mobile communication system, and has the characteristics of 2515MHz-2675MHz working frequency band, strong anti-interference capability, small whole volume and light weight.
The filter 10 has small loss, and can ensure low energy consumption of the communication module; the filter 10 is designed by combining 8-order resonant 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 10 has simple design scheme, low cost and good structure and electrical property stability; the filter 10 is capable of satisfying the current use of the latest 5G mobile communication system, and the filter 10 mainly relates to 2515MHz-2675MHz frequency bands.
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 92 and a radio frequency unit 91 connected to the antenna 92, the radio frequency unit 91 includes the filter 10 as shown in the above-described embodiment, and the filter 10 is used for filtering radio frequency signals.
In other embodiments, the rf unit 91 may also be integrally provided with the antenna 92 to form an active antenna unit (Active Antenna Unit, AAU).
Some embodiments of the present application are referred to as filters, and may also be referred to as combiners, i.e., dual frequency combiners. It will be appreciated that in other embodiments may also be referred to as a diplexer.
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 (10)

1. A filter, the filter comprising:
a housing;
the filtering branch is arranged on the shell and consists of eight filtering cavities which are sequentially coupled, the first filtering cavity and the third filtering cavity of the filtering branch are inductively and cross-coupled, and the third filtering cavity and the fifth filtering cavity, the fifth filtering cavity and the eighth filtering cavity, and the sixth filtering cavity and the eighth filtering cavity of the filtering branch are respectively and capacitively cross-coupled so as to form four cross-coupling zero points of the filtering branch;
the bandwidth range of the filter is 2515MHz-2675MHz;
the resonant frequencies of the first filter cavity to the eighth filter cavity of the filter branch are sequentially within the following ranges: 2592Mhz-2594Mhz, 2648Mhz-2650Mhz, 2586Mhz-2588Mhz, 2559Mhz-2561Mhz, 2593Mhz-2595Mhz, 2610Mhz-2612Mhz, 2546Mhz-2548Mhz, 2592Mhz-2594Mhz.
2. The filter of claim 1, wherein a first window is provided between the first filter cavity and the third filter cavity of the filter branch;
and capacitive coupling components are arranged between the third filter cavity and the fifth filter cavity, between the fifth filter cavity and the eighth filter cavity and between the sixth filter cavity and the eighth filter cavity of the filter branch.
3. The filter of claim 2, wherein the capacitive coupling assembly comprises a support cartridge and a coupling probe, the coupling probe being secured to the support cartridge, the support cartridge being disposed in windows between the third and fifth filter cavities, between the fifth and eighth filter cavities, and between the sixth and eighth filter cavities of the filter branch.
4. A filter according to claim 3, wherein eight filter cavities of the filter branch are sequentially window-coupled, and a second window is provided between two sequentially-coupled filter cavities of the filter branch.
5. The filter of claim 4, wherein the first window and the second window are each provided with a first tuning rod for adjusting coupling strength.
6. The filter according to claim 5, wherein ribs are respectively disposed between the third filter cavity and the fourth filter cavity, between the fourth filter cavity and the fifth filter cavity, between the fifth filter cavity and the sixth filter cavity, between the sixth filter cavity and the seventh filter cavity, and between the seventh filter cavity and the eighth filter cavity of the filter branch.
7. A filter according to any one of claims 1 to 6,
the eight filter cavities of the filter branch are divided into two rows arranged along a second direction, and the second direction is perpendicular to the first direction;
the first filter cavity, the fourth filter cavity, the sixth filter cavity and the seventh filter cavity of the filter branch are arranged in a row and are sequentially arranged along the first direction;
the second filter cavity, the third filter cavity, the fifth filter cavity and the eighth filter cavity of the filter branch are arranged in a row and are sequentially distributed along the first direction.
8. The filter of claim 1, wherein each of the filter cavities is provided with:
the resonant rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall;
one end of the second tuning rod is arranged in the hollow inner cavity;
the two ends of the U-shaped side wall bend and extend towards the direction deviating from the hollow inner cavity so as to form a disc-shaped structure at the two ends of the U-shaped side wall, and the disc-shaped structure is arranged in parallel with the bottom of the U-shaped side wall.
9. The filter of claim 8, wherein the housing is further provided with a mounting post, the U-shaped side wall being secured to the mounting post;
the filter further includes:
the first port is connected with a first filtering cavity of the filtering branch;
and the second port is connected with the eighth filter cavity of the filter branch.
10. 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 1-9 for filtering radio frequency signals.
CN202010308115.2A 2020-04-17 2020-04-17 Filter and communication equipment Active CN113540721B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102683769A (en) * 2011-06-15 2012-09-19 吴芬 Cavity filter, duplexer, combiner and transmission zero frequency debugging method for cavity filter
CN209691912U (en) * 2018-12-31 2019-11-26 深圳市大富科技股份有限公司 A kind of duplexer and communication equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102683769A (en) * 2011-06-15 2012-09-19 吴芬 Cavity filter, duplexer, combiner and transmission zero frequency debugging method for cavity filter
CN209691912U (en) * 2018-12-31 2019-11-26 深圳市大富科技股份有限公司 A kind of duplexer and communication equipment

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