CN113497315B - Filter and communication equipment - Google Patents
Filter and communication equipment Download PDFInfo
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- CN113497315B CN113497315B CN202010270843.9A CN202010270843A CN113497315B CN 113497315 B CN113497315 B CN 113497315B CN 202010270843 A CN202010270843 A CN 202010270843A CN 113497315 B CN113497315 B CN 113497315B
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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
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- 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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- Control Of Motors That Do Not Use Commutators (AREA)
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; eight filter cavities are arranged on the shell and are sequentially coupled along a main coupling path, and the third filter cavity and the sixth filter cavity and the fourth filter cavity and the sixth filter cavity in the eight filter cavities are respectively coupled in a capacitive cross way to form two capacitive coupling zero points of the filter; the sixth filter cavity and the eighth filter cavity in the eight filter cavities are inductively cross-coupled to form an inductively coupled zero point of the filter; wherein the bandwidth of the filter ranges from 1884MHz to 1916MHz. In this way, the stop band rejection performance of the filter can be improved.
Description
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 the stopband rejection performance of the existing cavity filter is poor in long-term research and development work.
Disclosure of Invention
The application mainly solves the technical problem of providing 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: a filter is provided. The filter includes: a housing having a first direction and a second direction perpendicular to each other; eight filter cavities are arranged on the shell and are sequentially coupled along a main coupling path, and capacitive cross coupling is respectively carried out between a third filter cavity and a sixth filter cavity and between a fourth filter cavity and the sixth filter cavity in the eight filter cavities to form two capacitive coupling zero points of the filter; inductive cross coupling between a sixth filter cavity and an eighth filter cavity in the eight filter cavities to form an inductive coupling zero of the filter; wherein the bandwidth of the filter ranges from 1884MHz to 1916MHz.
Optionally, the second to seventh and eighth filter cavities of the eight filter cavities are divided into two columns arranged along the second direction; the second filter cavity, the third filter cavity and the fourth filter cavity in the eight filter cavities are arranged in a row and are sequentially arranged along the first direction; the fifth filter cavity, the sixth filter cavity and the eighth filter cavity in the eight filter cavities are arranged in a row and are sequentially arranged along the first direction; a first filter cavity, a second filter cavity, an eighth filter cavity and a seventh filter cavity in the eight filter cavities are arranged in a straight line; a projection of a center of the seventh filter cavity in the first direction is located between a center of the sixth filter cavity and a projection of a center of the eighth filter cavity in the first direction; a projection of a center of the eighth filter cavity in the first direction is located between a center of the third filter cavity and a projection of a center of the second filter cavity in the first direction. The second filter cavity to the seventh filter cavity and the eighth filter cavity in the eight filter cavities are divided into two rows arranged along the second direction, and each row of filter cavities is arranged along the first direction, so that the oversized filter along the first direction and the second direction can be avoided; and the two rows of filter cavities are arranged in a staggered way, so that the filter has regular cavity arrangement, and is convenient to process and reduce the volume.
Optionally, a first window is arranged between the sixth filtering cavity and the eighth filtering cavity; and a fly rod is arranged between the third filter cavity and the sixth filter cavity and between the fourth filter cavity and the sixth filter cavity. Inductive cross coupling is achieved through the first window, and inductive cross coupling is achieved through the flying lever.
Optionally, the flying lever is in a sheet-shaped arrangement, the flying lever comprises 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. Simple structure, convenient to process.
Optionally, the eight filter cavities are sequentially and adjacently arranged along the main coupling path, and a second window is arranged between any group of adjacently arranged filter cavities. Electromagnetic energy transfer is performed between two adjacent filter cavities on the main coupling path through a second window.
Optionally, the first window and the second window are respectively provided with an adjusting rod; and reinforcing ribs are respectively arranged on a second window between the first filtering cavity and the second filtering cavity, a second window between the second filtering cavity and the third filtering cavity and a second window between the third filtering cavity and the fourth filtering cavity. The coupling strength of the first window and the second window is regulated by the regulating rod, and the coupling strength between two adjacent filter cavities on the main coupling path is improved by the reinforcing ribs.
Optionally, the filter cavity is provided with: the resonant rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped 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 two ends of the U-shaped side wall bend and extend in a direction away from the hollow cavity, so as to form a disc structure at the two ends of the U-shaped side wall, and the disc structure is parallel to 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.
Optionally, a mounting post is further arranged on the shell, and the U-shaped side wall is fixed on the mounting post. The resonant rod is fixed on the shell through the mounting column.
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; eight filter cavities are arranged on the shell and are sequentially coupled along a main coupling path, and the third filter cavity and the sixth filter cavity and the fourth filter cavity and the sixth filter cavity in the eight filter cavities are respectively coupled in a capacitive cross way to form two capacitive coupling zero points of the filter; the sixth filter cavity and the eighth filter cavity in the eight filter cavities are inductively cross-coupled to form an inductively coupled zero point of the filter; wherein the bandwidth of the filter ranges from 1884MHz to 1916MHz. The filter can realize the filtering of 1884MHz-1916MHz bandwidth; the filter can realize an inductive coupling zero point, can well control the high-end inhibition of the bandwidth of the filter, obtain better high-end inhibition of the bandwidth, can realize two capacitive coupling zero points, can well control the low-end inhibition of the bandwidth of the filter, and obtain better low-end inhibition of the bandwidth, so that the stop band inhibition performance of the filter 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 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 view of the combined structure of the fly rod and the holder in the filter 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 view of the combined structure of the fly rod and the holder in the filter 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 eight filter cavities A1-A8, wherein the housing 11 has a first direction x and a second direction y perpendicular to each other; eight filter cavities A1-A8 are arranged on the housing 11, the eight filter cavities A1-A8 are coupled in sequence along a main coupling path, and capacitive cross coupling is respectively carried out between a third filter cavity A3 and a sixth filter cavity A6 and between a fourth filter cavity A4 and the sixth filter cavity A6 in the eight filter cavities A1-A8 so as to form two capacitive coupling zero points of the filter 10; inductive cross-coupling between a sixth filter cavity A6 and an eighth filter cavity A8 of the eight filter cavities A1-A8 forms an inductive coupling zero of the filter 10; wherein the bandwidth of the filter 10 ranges from 1884MHz to 1916MHz.
Wherein the eight filter cavities A1-A8 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 and an eighth filter cavity A8.
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.
Unlike the prior art, the filter 10 of the present embodiment can implement filtering of 1884MHz-1916MHz bandwidths; the filter 10 of this embodiment can implement an inductive coupling zero, can well control the high-end suppression of the bandwidth of the filter 10, obtain better high-end suppression of the bandwidth, and can implement two capacitive coupling zero, can well control the low-end suppression of the bandwidth of the filter 10, obtain better low-end suppression of the bandwidth, therefore, can improve the stop band suppression performance of the filter 10.
Alternatively, as shown in fig. 1, the second to eighth filter cavities A2 to A8 among the eight filter cavities A1 to A8 are divided into two columns arranged in the second direction y; the second filter cavity A2, the third filter cavity A3 and the fourth filter cavity A4 in the eight filter cavities A1-A8 are arranged in a row and are sequentially arranged along the first direction x; the fifth filter cavity A5, the sixth filter cavity A6 and the eighth filter cavity A8 in the eight filter cavities A1-A8 are in a row and are sequentially arranged along the first direction x; the first filter cavity A1, the second filter cavity A2, the eighth filter cavity A8 and the seventh filter cavity A7 of the eight filter cavities A1-A8 are arranged in a straight line; the projection of the center of the seventh filter cavity A7 in the first direction x is located between the center of the sixth filter cavity A6 and the projection of the center of the eighth filter cavity A8 in the first direction x; the projection of the center of the eighth filter cavity A8 in the first direction x is located between the center of the third filter cavity A3 and the projection of the center of the second filter cavity A2 in the first direction x.
From the above analysis, the second to seventh filter cavities A2 to A7 and the eighth filter cavity A8 of the eight filter cavities A1 to A8 are divided into two rows arranged along the second direction y, and each row of filter cavities is arranged along the first direction x, so that the filter 10 can be prevented from being oversized along the first direction x and along the second direction y; and the two 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, the eight filter cavities A1-A8 are provided with a resonant rod 20 and a tuning rod 30; wherein, the resonant rod 20 includes a U-shaped sidewall 210 and a hollow cavity 220 formed by the U-shaped sidewall 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.
Alternatively, as shown in fig. 3, both ends of the U-shaped sidewall 210 are bent and extended in a direction away from the hollow cavity 220, so as to form a disk-shaped structure 230 at both ends of the U-shaped sidewall 210, and the disk-shaped structure 230 is disposed parallel to the bottom of the U-shaped sidewall 210.
The disk-like structures 230 at both ends of the U-shaped sidewall 210 can increase the amount of signal coupling of the resonant rod 20.
Alternatively, the eight filter cavities A1-A8 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 eight filter cavities A1-A8 have the same size, so that the production is convenient, and the cost is saved. The radius of the eight filter cavities A1-A8 may be smaller than 21mm, e.g. 20mm, 19mm, 18mm, etc.
Optionally, as shown in fig. 3, a mounting post 40 is further provided on the housing 11, and a u-shaped sidewall 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 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.
Further, the filter 10 further includes a cover plate (not shown) covering the eight filter cavities A1-A8, 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.
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.
Optionally, the present embodiment sets a first window between the sixth filter cavity A6 and the eighth filter cavity A8, and inductive cross coupling is implemented through the first window.
Alternatively, to adjust the coupling strength of the inductive cross coupling, an adjusting lever 81 may be provided at the first window.
In other embodiments, to increase the coupling strength of the inductive cross coupling, a metal coupling rib may be disposed in the first window.
Optionally, a fly rod 60 may be provided between the third filter cavity A3 and the sixth filter cavity A6, and between the fourth filter cavity A4 and the sixth filter cavity A6. Inductive cross coupling is achieved by flybars 60.
Alternatively, as shown in fig. 1 and 4, the flying lever 60 of the present embodiment is provided in a sheet shape, which is convenient for processing. Specifically, the fly lever 60 includes: the first coupling portion 610, the second coupling portion 620 and the connecting portion 630, two ends of the connecting portion 630 are respectively connected with 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 connecting portion 630. The first coupling portion 610, the connecting portion 630 and the second coupling portion 620 are sequentially connected to form the U-shaped flying bar 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 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.
As shown in fig. 1, eight filter cavities A1-A8 are sequentially and adjacently arranged along a main coupling path, and a second window (not shown) is arranged between any group of adjacently arranged filter cavities, and electromagnetic energy transfer is performed between two adjacent filter cavities on the main coupling path through the second window. For example, second 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, and between the seventh filter chamber A7 and the eighth filter chamber A8, respectively.
The filter 10 of the present embodiment further includes a plurality of adjustment bars 50 and a plurality of reinforcing 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 a second window, for example, a second window between the first filter cavity A1 and the second filter cavity A2, a second window between the second filter cavity A2 and the third filter cavity A3, a second window between the third filter cavity A3 and the fourth filter cavity A4, a second window between the fourth filter cavity A4 and the fifth filter cavity A5, a second window between the fifth filter cavity A5 and the sixth filter cavity A6, a second window between the sixth filter cavity A6 and the seventh filter cavity A7, and a second window between the seventh filter cavity A7 and the eighth filter cavity A8, respectively, an adjusting rod 50 may be provided.
In order to improve the coupling strength between two adjacent filter cavities on the main coupling path, the reinforcing ribs 80 may be disposed at a second window, for example, the reinforcing ribs 80 may be disposed at a second window between the first filter cavity A1 and the second filter cavity A2, a second window between the second filter cavity A2 and the third filter cavity A3, and a second window between the third filter cavity A3 and the fourth filter cavity A4, respectively.
Further, as shown in fig. 1, the filter 10 of the present embodiment further includes: an input port (not shown) connected to the first filter cavity A1 of the filter 10 and an output port (not shown) connected to the eighth filter cavity A8 of the filter 10.
The input port and the output port are taps, and the input port is connected with the resonant rod 20 in the first filter cavity A1 and inputs electromagnetic signals into the first filter cavity A1; the output port is connected with the resonant rod 20 in the eighth filter cavity A8, and outputs the electromagnetic signal in the eighth filter cavity A8.
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 filter cavities A1-A8 of the filter 10, impedance adjusters ZV are required to be respectively arranged between the input port 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 eighth filter cavity A8 and the output port to achieve impedance matching.
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 1884MHz-1916MHz; as shown in the band curve S1, there are one low-side coupling zero a and two high-side coupling zero b, c in common; the suppression of the frequency point 1.885GHz (m 1) is-2.398 dB, and the suppression of the frequency point 1.915GHz (m 2) is-2.943 dB, so that the filter 10 has the characteristic of small in-band loss (less than 3.5 dB); and the suppression of the frequency point 1.880GHz (m 3) is-38.115 dB, and the suppression of the frequency point 1.920GHz (m 4) is-49.548 dB, so that the filter 10 has the performance of strong anti-interference capability (the suppression of the low-end 5MHz outside the passband is more than 28dB, and the suppression of the high-end 5MHz outside the passband is more than 42 dB).
The filter 10 of this embodiment is an 8-order microwave filter applied to a 5G mobile communication system, and has the characteristics of 879 MHz-916 MHz of operating frequency band, small in-band loss (less than 3.5 dB), strong anti-interference capability (suppression of lower end 5MHz outside a passband being greater than 28dB, suppression of higher end 5MHz outside the passband being greater than 42 dB), small overall size and light weight.
The filter of the embodiment of the application has small loss, and can ensure low energy consumption of the communication module; the filter 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 has simple design scheme, low cost and good structure and electrical property stability; the filter can meet the use of the current latest 5G mobile communication system, and the filter mainly relates to the 1800MHz 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; eight filter cavities are arranged on the shell and are sequentially coupled along a main coupling path, and capacitive cross coupling is formed between a third filter cavity and a sixth filter cavity and between a fourth filter cavity and the sixth filter cavity in the eight filter cavities respectively to form two capacitive cross coupling zero points of the filter; the sixth filter cavity and the eighth filter cavity in the eight filter cavities are inductively cross-coupled to form an inductively coupled zero point of the filter; wherein the bandwidth of the filter ranges from 1884MHz to 1916MHz. The filter can realize the filtering of 1884MHz-1916MHz bandwidth; the filter can realize an inductive coupling zero point, can well control the high-end inhibition of the bandwidth of the filter, obtain better high-end inhibition of the bandwidth, can realize two capacitive coupling zero points, can well control the low-end inhibition of the bandwidth of the filter, and obtain better low-end inhibition of the bandwidth, so that the stop band inhibition performance of the filter can be improved.
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 (5)
1. A filter, the filter comprising:
a housing having a first direction and a second direction perpendicular to each other;
eight filter cavities are arranged on the shell and are sequentially coupled along a main coupling path, and capacitive cross coupling is respectively carried out between a third filter cavity and a sixth filter cavity and between a fourth filter cavity and the sixth filter cavity in the eight filter cavities to form two capacitive coupling zero points of the filter; inductive cross coupling between a sixth filter cavity and an eighth filter cavity in the eight filter cavities to form an inductive coupling zero of the filter;
wherein the bandwidth range of the filter is 1884MHz-1916MHz;
a flying rod is arranged between the third filter cavity and the sixth filter cavity and between the fourth filter cavity and the sixth filter cavity;
the flying rod is arranged in a sheet shape and comprises 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 filter further includes: the fixing seat is arranged on the shell and 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 second filter cavity to the sixth filter cavity and the eighth filter cavity in the eight filter cavities are divided into two rows arranged along the second direction; the second filter cavity, the third filter cavity and the fourth filter cavity in the eight filter cavities are arranged in a row and are sequentially arranged along the first direction; the fifth filter cavity, the sixth filter cavity and the eighth filter cavity in the eight filter cavities are arranged in a row and are sequentially arranged along the first direction; a first filter cavity, a second filter cavity, an eighth filter cavity and a seventh filter cavity in the eight filter cavities are arranged in a straight line; a projection of a center of the seventh filter cavity in the first direction is located between a center of the sixth filter cavity and a projection of a center of the eighth filter cavity in the first direction; a projection of a center of the eighth filter cavity in the first direction is located between a center of the third filter cavity and a projection of a center of the second filter cavity in the first direction;
a first window is arranged between the sixth filtering cavity and the eighth filtering cavity;
the eight filter cavities are sequentially and adjacently arranged along the main coupling path, and a second window is arranged between any group of adjacently arranged filter cavities;
the first window and the second window are respectively provided with an adjusting rod;
and reinforcing ribs are respectively arranged on a second window between the first filtering cavity and the second filtering cavity, a second window between the second filtering cavity and the third filtering cavity and a second window between the third filtering cavity and the fourth filtering cavity.
2. The filter according to claim 1, wherein the filter cavity is provided with:
the resonant rod comprises a U-shaped side wall and a hollow inner cavity formed by the U-shaped side wall;
and one end of the tuning rod is arranged in the hollow inner cavity.
3. The filter of claim 2, wherein the two ends of the U-shaped sidewall are folded and extended away from the hollow cavity to form a disk-shaped structure at the two ends of the U-shaped sidewall, and the disk-shaped structure is disposed parallel to the bottom of the U-shaped sidewall.
4. The filter of claim 2, wherein the housing is further provided with mounting posts, and the U-shaped side walls are secured to the mounting posts.
5. 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 1-4 for filtering radio frequency signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010270843.9A CN113497315B (en) | 2020-04-08 | 2020-04-08 | Filter and communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010270843.9A CN113497315B (en) | 2020-04-08 | 2020-04-08 | Filter and communication equipment |
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| Publication Number | Publication Date |
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| CN113497315A CN113497315A (en) | 2021-10-12 |
| CN113497315B true CN113497315B (en) | 2023-06-16 |
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| CN202010270843.9A Active CN113497315B (en) | 2020-04-08 | 2020-04-08 | Filter and communication equipment |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361117A (en) * | 2011-09-29 | 2012-02-22 | 武汉虹信通信技术有限责任公司 | Capacitive cross coupling flying bar and coaxial cavity resonator thereof |
| 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 |
-
2020
- 2020-04-08 CN CN202010270843.9A patent/CN113497315B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361117A (en) * | 2011-09-29 | 2012-02-22 | 武汉虹信通信技术有限责任公司 | Capacitive cross coupling flying bar and coaxial cavity resonator thereof |
| 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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|---|---|
| CN113497315A (en) | 2021-10-12 |
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Address after: 233000 building 4, national financial incubation Industrial Park, 17 Yannan Road, high tech Zone, Bengbu City, Anhui Province Applicant after: Dafu Technology (Anhui) Co.,Ltd. Address before: 518104 First, Second and Third Floors of A1, A2, A3 101, A4 of Shajing Street, Shajing Street, Baoan District, Shenzhen City, Guangdong Province Applicant before: SHENZHEN TATFOOK TECHNOLOGY Co.,Ltd. |
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