CN104518264A - Coaxial cavity filter, medium cavity filter and metal resonant column - Google Patents
Coaxial cavity filter, medium cavity filter and metal resonant column Download PDFInfo
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- CN104518264A CN104518264A CN201310456955.3A CN201310456955A CN104518264A CN 104518264 A CN104518264 A CN 104518264A CN 201310456955 A CN201310456955 A CN 201310456955A CN 104518264 A CN104518264 A CN 104518264A
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Abstract
The invention provides a cavity filter, and aims at solving the technical problem that existing small cavity filters are small in frequency adjusting range. The cavity filter comprises a cavity and a cover plate. The cover plate covers the cavity in a sealing way so that multiple resonant cavities are formed. The resonant cavities are internally provided with metal resonant columns which are arranged at the side wall of the cavity. The metal resonant columns are provided with tuning holes which extend along a radial direction. The bottom part of the cavity or the cover plate is provided with tuning screw rods which stretch into the holes to adjust the frequency range of the resonant cavities.
Description
Technical field
The invention provides a kind of coaxial cavity filter, dielectric cavity fluid filter and the metal resonant column for above-mentioned two kinds of cavity body filters.
Background technology
Cavity body filter is widely used in the communications field as a kind of frequency selection device, particularly field of radio frequency communication, in the base station of the launching and receiving of communication system settling signal, cavity body filter, for selecting signal of communication, eliminates the clutter beyond communication signal frequency or interference signal.
In order to the weight that reduces cavity body filter and the windage be subject to, client's is more and more less to the volume requirement of cavity body filter, this just require cavity body filter to do very thin.As shown in Figure 1, such cavity body filter requires the metal resonant column 120 be originally arranged on bottom cavity 110 to be installed on the first side wall 111 of cavity 110, and the tuning screw 130 be originally positioned at accordingly on cover plate also will be installed on the second sidewall 112 relative with cavity 110 the first side wall 111.But this cavity body filter needs cavity to erect when debugging, operation is quite inconvenient.
As shown in Figure 2, originally the metal resonant column 220 be arranged on bottom cavity 210 is also installed on the first side wall 211 of cavity 210 by existing another kind of cavity body filter, but tuning screw 230 is not installed on the second sidewall 212 relative with cavity 210 the first side wall 211, but still install on the cover board, tuning screw 230 extend between the open end of resonant column 220 and the second sidewall 212 of cavity 210.The cavity body filter of this structure, the coupling area formed between tuning screw and metal resonant column is limited, therefore limited to the adjustment of the coupling strength between resonant cavity.
Summary of the invention
The object of the present invention is to provide a kind of small volume, debugging conveniently, and the coaxial cavity filter that frequency-tuning range is large, small volume, the dielectric cavity fluid filter that debugging is convenient, strap is roomy, and for the metal resonant column of above-mentioned two kinds of cavity body filters.
Coaxial cavity filter provided by the invention comprises cavity, cover plate, described in described cover plate capping, cavity forms multiple resonant cavity, metal resonant column is set in described resonant cavity, described metal resonant column is arranged on the sidewall of described cavity, described metal resonant column is provided with the tuned window radially extended, described cavity bottom or cover plate are provided with tuning screw, and described tuning screw stretches in described tuned window to regulate the frequency regulating resonant cavity between adjacent resonators.
Preferably, described tuned window is through hole.
Preferably, described metal resonant column is solid.
Preferably, described metal resonant column is located at the central authorities of the cavity wall in its place resonant cavity.
Preferably, the metal resonant column in adjacent resonators is alternately arranged on the relative sidewall of cavity.
Preferably, the metal resonant column in adjacent resonators is arranged on the sidewall of cavity the same side respectively.
Adopt coaxial cavity filter of the present invention, metal resonant column is arranged on the sidewall of cavity, reduces the height of cavity, makes coaxial cavity filter smaller volume; The sidewall of metal resonant column has tuned window, and on the bottom making tuning screw can be arranged on cavity or cover plate, debugging is more convenient like this, can also improve resonant cavity frequency-tuning range.
Dielectric cavity fluid filter provided by the invention comprises cavity, cover plate, and described in described cover plate capping, cavity forms first resonant cavity, tail resonant cavity, and the multiple dielectric resonant chambers between first resonant cavity and tail resonant cavity; Metal resonant column is provided with in described first resonant cavity and tail resonant cavity, dielectric resonance post is provided with in described dielectric resonant chamber, described metal resonant column is located on the sidewall of described cavity, described metal resonant column is provided with the radial tuned window extended, described cavity bottom or cover plate are provided with tuning screw, and described tuning screw stretches in described tuned window to regulate the frequency-tuning range of dielectric resonant chamber and described first resonant cavity or tail resonant cavity.
Preferably, described tuned window is through hole.
Preferably, described metal resonant column is solid.
Preferably, described metal resonant column is located at the central authorities of the cavity wall in its place resonant cavity.
Adopt dielectric cavity fluid filter of the present invention, metal resonant column laterally installs the height reducing cavity, makes dielectric cavity fluid filter smaller volume.The transverse direction of metal resonant column is installed and is also made the magnetic field line of the magnetic field line of metal resonant column and adjacent media resonant column in same plane, adds the window coupling bandwidth between resonant cavity; And tap line can be made linearity and is directly connected with metal resonant column, tap line manufacture and install more simple.The sidewall of metal resonant column has radial tuned window, on the bottom that tuning screw still can be arranged on cavity or cover plate, debugs also more convenient like this.
Metal resonant column provided by the invention, for cavity body filter, described metal resonant column is arranged on the sidewall of described cavity, and the sidewall of described metal resonant column is provided with tuned window.
Preferably, described tuned window is through hole.
Preferably, described metal resonant column is solid.
Adopt metal resonant column of the present invention, the volume of cavity body filter can be reduced, also improve frequency-tuning range and the window coupling bandwidth of resonant cavity simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1; The cavity body filter profile of prior art 1
Fig. 2; The cavity body filter profile of prior art 2
Fig. 3; The cavity body filter profile of the first execution mode of embodiment one
Fig. 4; Along the cavity body filter profile that Fig. 3 does
Fig. 5; The cavity body filter profile of embodiment one the second execution mode
Fig. 6; The cavity body filter profile of embodiment two
Fig. 7; The frequency-tuning range of embodiment one coaxial cavity filter
Fig. 8; The frequency-tuning range of the coaxial cavity filter of prior art 2
Fig. 9; The window coupling bandwidth of embodiment second medium filter
Figure 10; The window coupling bandwidth of prior art medium filter
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
As shown in Fig. 3,4 and 5, the coaxial cavity filter that the present embodiment provides comprises cavity 310, cover plate 320, described in the capping of described cover plate 320, cavity 310 forms multiple resonant cavity 330, in described resonant cavity 330, metal resonant column 340 is set, described metal resonant column 340 is arranged on the sidewall of described cavity 310, described metal resonant column 340 is provided with the tuned window 341 radially extended, bottom described cavity 310 or cover plate 320 be provided with tuning screw 350, described tuning screw 350 stretches in described tuned window 341 to regulate the frequency of resonant cavity 330.
The fixed form of metal resonant column 340 has multiple, such as directly can be welded on the sidewall of cavity 310, can certainly shown in Fig. 4 and Fig. 5, at the sidewall of cavity 310, the integrated boss having depression is with it set, metal resonant column 340 inserts this boss, and metal resonant column 340 is fixed by the sidewall then screw being inserted this boss along cover plate to cavity bottom direction.
Preferably, the tuned window 341 on described metal resonant column 340 sidewall is through hole.Certain described tuned window 341 also can be blind hole, but through hole more advantageously: first when tuned window 340 is through hole, and tuning screw 350 stretches into the degree of depth of tuned window 341 can be deeper and more, and its adjustable range is larger accordingly; Its two, when tuned window 341 is blind hole, tuning screw 350 may encounter the bottom of tuned window 341 in the process stretching into tuned window 341, makes to be short-circuited between tuning screw 350 and metal resonant column 340.If tuned window 341 is through hole, such problem can not be run into.
Preferably, described metal resonant column 340 is solid.Existing metal resonant column 340 is generally made through Multi-step forming with metallic plate, and its central authorities are hollow, and the tuned window 341 of the present embodiment can directly be opened on the sidewall of such metal resonant column 340.But the tuned window 341 of the present embodiment is preferably directly opened on solid metal resonant column, such metal resonant column directly can be cast and form, and processes easy.If two metal resonant columns 340 are hollow, the metal resonant column hole wall area so forming electric capacity with the outer peripheral face of tuning screw 350 is less, can metal resonant column 340 if solid, the metal resonant column hole wall area then forming electric capacity with the outer peripheral face of tuning screw 350 significantly increases, and corresponding frequency-tuning range also can increase.
Preferably, described metal resonant column 340 is located at the central authorities of cavity 310 sidewall in its place resonant cavity 330.The magnetic field space that metal resonant column 340 is formed is with the center of its top card for the center of circle, the disc shaped space formed from the distance of nearest sidewall for radius with the center of its top card.Therefore the sidewall of which side of metal resonant column 340 in that resonant cavity 330 at its place no matter in cavity 310 4 sidewalls, capital causes the segment space between metal resonant column 340 and cavity 310 opposite side sidewall effectively not utilize, and namely that a part of space does not have magnetic field.So metal resonant column 340 is preferably positioned at the central authorities of cavity wall 310, to make full use of the space of its place resonant cavity 330, form maximum field region, increase frequency-tuning range.
As shown in Figure 1, the metal resonant column 340 in adjacent resonators 330 is arranged on the sidewall of cavity 310 the same side respectively.This coaxial cavity filter is more common, is called as comb filter.
As shown in Figure 5, the metal resonant column 340 in adjacent resonators 330 is arranged on the relative sidewall of cavity 310 respectively.This coaxial cavity filter is called as interdigital filter, the horizontal resonant column having radial tuned window is used for this cavity body filter, can not only increases the frequency-tuning range of resonant cavity, can also increase the coupling bandwidth between resonant cavity.
Adopt the coaxial cavity filter of the present embodiment, metal resonant column 340 is laterally arranged on the sidewall of cavity 310, reduces the height of cavity 310, makes coaxial cavity filter smaller volume; Metal resonant column 340 have the radial tuned window 341 extended, on the bottom making tuning screw 350 can be arranged on cavity 310 or cover plate 320, so not only debug more convenient, and resonant cavity 330 frequency-tuning range also can improve.Adopt the technical scheme of the present embodiment, as shown in Figure 7, when tuning screw diameter changes to 15mm from 8mm, the frequency of resonant cavity changes to 1797.4MHz from 2538.9MHz, and frequency-tuning range is 741.5MHz.Adopt the technical scheme of prior art 2, namely metal resonant column is arranged on cavity wall, the sidewall of metal resonant column does not offer radial tuned window, the sidewall of adjusting screw(rod) is relative with the free end face of resonant column, as shown in Figure 8, when tuning screw diameter changes to 15mm from 8mm, the frequency of resonant cavity changes to 2332.3MHz from 2537.5MHz, and frequency-tuning range only has 205MHz.
Embodiment two
As shown in Figure 6, the dielectric cavity fluid filter that the present embodiment provides comprises cavity 410, cover plate 420, described in the capping of described cover plate 420, cavity 410 forms first resonant cavity 431, tail resonant cavity 432, and the multiple dielectric resonant chambers 433 between first resonant cavity 431 and tail resonant cavity 432; In described first resonant cavity 431 and tail resonant cavity 432, metal resonant column 440 is set, in described dielectric resonant chamber 433, dielectric resonance post 450 is set, described metal resonant column 440 is located on the sidewall of described cavity 410, described metal resonant column 440 be provided with the tuned window 441 radially extended, bottom described cavity 410 or cover plate 420 be provided with tuning screw 460, described tuning screw 460 stretches into described tuned window 441 to regulate the frequency of dielectric resonant chamber 433 and described first resonant cavity 431 or tail resonant cavity 432.
Have larger magnetic coupling window between the resonant cavity that this dielectric filter is adjacent, its coupled modes are in magnetic coupling mode.
The fixed form of metal resonant column 440 has multiple, such as directly can be welded on the sidewall of cavity 410, the integrated boss having depression with it can also be set at the sidewall of cavity 410, metal resonant column 440 inserts this boss, and metal resonant column 440 is fixed by the sidewall then screw being inserted this boss along cover plate to cavity bottom direction.
Preferably, the tuned window 441 on described metal resonant column 440 sidewall is through hole.
Preferably, described metal resonant column 440 is solid.
Preferably, described metal resonant column 440 is located at cavity 410 side wall centers of first resonant cavity 431 and tail resonant cavity 432.
The advantage of above-mentioned three preferred features has had and has described in embodiment one, does not repeat them here.Adopt dielectric cavity fluid filter of the present invention, metal resonant column 440 is laterally arranged on the sidewall of cavity 410, reduces the height of cavity 410, makes dielectric cavity fluid filter smaller volume.In addition metal resonant column is laterally put and is made the magnetic field line of the magnetic field line of metal resonant column 440 and adjacent media resonant column 450 in same plane, not only the coupling bandwidth of resonant cavity improves, and tap line need not be made and is coupled with metal resonant column around metal resonant column 1/4th round again, but make linearity and be directly connected with metal resonant column, manufacture and the installation difficulty of tap line all reduce.In addition because the sidewall of metal resonant column 440 has the radial tuned window 441 extended, tuning screw 460 can be debugged on the bottom of cavity 410 or cover plate 420, debugs also more convenient.Adopt the technical scheme of the present embodiment, as shown in Figure 9, the window coupling bandwidth of resonant cavity is about 2534-2520=14MHz.If adopt the scheme of prior art, namely metal resonant column is arranged on cavity diapire, metal resonant column has axial tuned window, tuning screw stretches in the axial tuned window of resonant column from cover plate, as shown in Figure 10, the window coupling bandwidth of resonant cavity is only about 2530.6MHz-2530.5MHz=0.1MHz.
Embodiment three
The metal resonant column that the present embodiment provides, for cavity body filter, the sidewall of described metal resonant column is provided with tuned window, and described tuned window is used for the coupling strength that tuning screw stretches into regulate between adjacent resonators.
Preferably, the tuned window on described metal resonant column sidewall is through hole.
Preferably, described metal resonant column is solid.Adopt this programme, the manufacture of metal resonant column only needs casting and punching two steps, and operation is simple, easily manufactured.
Adopt metal resonant column of the present invention, the volume of cavity body filter can be reduced, go back frequency-tuning range and the window coupling bandwidth of resonant cavity simultaneously.
Apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1. a coaxial cavity filter, comprise cavity, cover plate, described in described cover plate capping, cavity forms multiple resonant cavity, metal resonant column is set in described resonant cavity, it is characterized in that: described metal resonant column is arranged on the sidewall of described cavity, described metal resonant column is provided with the tuned window radially extended, and described cavity bottom or cover plate are provided with tuning screw, and described tuning screw stretches in described tuned window to regulate the frequency of resonant cavity.
2. coaxial cavity filter according to claim 1, is characterized in that: described tuned window is through hole.
3. coaxial cavity filter according to claim 2, is characterized in that: described metal resonant column is solid.
4. coaxial cavity filter according to claim 1, is characterized in that: described metal resonant column is located at the central authorities of the cavity wall in its place resonant cavity.
5. the coaxial cavity filter according to Claims 1-4 any one, is characterized in that: the metal resonant column in adjacent resonators is alternately arranged on the relative sidewall of cavity.
6. the coaxial cavity filter according to Claims 1-4 any one, is characterized in that: the metal resonant column in adjacent resonators is arranged on the sidewall of cavity the same side respectively.
7. a dielectric cavity fluid filter, comprises cavity, cover plate, and described in described cover plate capping, cavity forms first resonant cavity, tail resonant cavity, and the multiple dielectric resonant chambers between first resonant cavity and tail resonant cavity; Metal resonant column is provided with in described first resonant cavity and tail resonant cavity, dielectric resonance post is provided with in described dielectric resonant chamber, it is characterized in that, described metal resonant column is located on the sidewall of described cavity, described metal resonant column is provided with the radial tuned window extended, described cavity bottom or cover plate are provided with tuning screw, and described tuning screw stretches in described tuned window to regulate the frequency of first resonant cavity and tail resonant cavity.
8. dielectric cavity fluid filter according to claim 7, is characterized in that: described tuned window is through hole.
9. dielectric cavity fluid filter according to claim 8, is characterized in that: described metal resonant column is solid.
10. dielectric cavity fluid filter according to claim 7, is characterized in that: described metal resonant column is located at the central authorities of described first resonant cavity and tail resonator body sidewall.
11. 1 kinds of metal resonant columns, for cavity body filter, is characterized in that, described metal resonant column is arranged on the sidewall of cavity, and the sidewall of described metal resonant column is provided with tuned window.
12. metal resonant columns according to claim 11, is characterized in that: described tuned window is through hole.
13. metal resonant columns according to claim 12, is characterized in that: described metal resonant column is solid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310456955.3A CN104518264A (en) | 2013-09-29 | 2013-09-29 | Coaxial cavity filter, medium cavity filter and metal resonant column |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310456955.3A CN104518264A (en) | 2013-09-29 | 2013-09-29 | Coaxial cavity filter, medium cavity filter and metal resonant column |
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| CN104518264A true CN104518264A (en) | 2015-04-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104916888A (en) * | 2015-05-14 | 2015-09-16 | 中国电子科技集团公司第四十一研究所 | High-power filter |
| CN109950671A (en) * | 2019-04-03 | 2019-06-28 | 江苏贝孚德通讯科技股份有限公司 | Pectination duplexer |
| WO2019127496A1 (en) * | 2017-12-29 | 2019-07-04 | 华为技术有限公司 | Cavity filter |
| WO2019213916A1 (en) * | 2018-05-10 | 2019-11-14 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS641313A (en) * | 1987-06-24 | 1989-01-05 | Matsushita Electric Ind Co Ltd | Adjusting method for resonant frequency of ring-shaped resonator |
| US5754083A (en) * | 1994-09-13 | 1998-05-19 | Murata Manufacturing Co., Ltd. | TM mode dielectric resonator having frequency adjusting holes with voids |
| CN101841075A (en) * | 2009-10-13 | 2010-09-22 | 安徽省大富机电技术有限公司 | Resonant tube |
| CN102969551A (en) * | 2012-11-02 | 2013-03-13 | 广东通宇通讯股份有限公司 | Tap electrical coupling structure and communication radio frequency device thereof |
| CN203134947U (en) * | 2012-12-28 | 2013-08-14 | 深圳市大富科技股份有限公司 | Filter and coupling structure of metal resonator and medium resonator |
| CN203574079U (en) * | 2013-09-29 | 2014-04-30 | 深圳市大富科技股份有限公司 | Coaxial cavity filter, dielectric cavity filter and metal resonant column |
-
2013
- 2013-09-29 CN CN201310456955.3A patent/CN104518264A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS641313A (en) * | 1987-06-24 | 1989-01-05 | Matsushita Electric Ind Co Ltd | Adjusting method for resonant frequency of ring-shaped resonator |
| US5754083A (en) * | 1994-09-13 | 1998-05-19 | Murata Manufacturing Co., Ltd. | TM mode dielectric resonator having frequency adjusting holes with voids |
| CN101841075A (en) * | 2009-10-13 | 2010-09-22 | 安徽省大富机电技术有限公司 | Resonant tube |
| CN102969551A (en) * | 2012-11-02 | 2013-03-13 | 广东通宇通讯股份有限公司 | Tap electrical coupling structure and communication radio frequency device thereof |
| CN203134947U (en) * | 2012-12-28 | 2013-08-14 | 深圳市大富科技股份有限公司 | Filter and coupling structure of metal resonator and medium resonator |
| CN203574079U (en) * | 2013-09-29 | 2014-04-30 | 深圳市大富科技股份有限公司 | Coaxial cavity filter, dielectric cavity filter and metal resonant column |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104916888A (en) * | 2015-05-14 | 2015-09-16 | 中国电子科技集团公司第四十一研究所 | High-power filter |
| WO2019127496A1 (en) * | 2017-12-29 | 2019-07-04 | 华为技术有限公司 | Cavity filter |
| CN111279546A (en) * | 2017-12-29 | 2020-06-12 | 华为技术有限公司 | Cavity filter |
| US11196136B2 (en) | 2017-12-29 | 2021-12-07 | Huawei Technologies Co., Ltd. | Cavity filter |
| WO2019213916A1 (en) * | 2018-05-10 | 2019-11-14 | 深圳市大富科技股份有限公司 | Cavity filter and communication radio frequency device |
| CN109950671A (en) * | 2019-04-03 | 2019-06-28 | 江苏贝孚德通讯科技股份有限公司 | Pectination duplexer |
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