CN102881973B - Coaxial cavity filter achieving transmission zero - Google Patents
Coaxial cavity filter achieving transmission zero Download PDFInfo
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- CN102881973B CN102881973B CN201110197766.XA CN201110197766A CN102881973B CN 102881973 B CN102881973 B CN 102881973B CN 201110197766 A CN201110197766 A CN 201110197766A CN 102881973 B CN102881973 B CN 102881973B
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- cavity
- transmission zero
- cross
- filter
- coaxial cavity
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Abstract
The invention relates to a coaxial cavity filter achieving transmission zero, which comprises a cavity, resonance columns, two branch lines, two radio frequency connectors and a cross-coupling element; the two radio frequency connectors are arranged at the two ends of the cavity and are connected with the branch lines; and the resonance columns and the cross-coupling element are respectively arranged in the cavity. Compared with the prior art, the advantages provided by the invention are that the coaxial cavity filter is simple and compact in structure and convenient to debug, etc.
Description
Technical field
The present invention relates to a kind of filter, especially relate to a kind of coaxial cavity filter of realizing transmission zero.
Background technology
Develop rapidly along with mobile communcations system, microwave communication technology, frequency spectrum day by day crowded, the performance index of filter have been proposed to more and more higher requirement, in high selectivity, small size, passband, the RF/Microwave band pass filter of low insertion loss becomes very important, conventional Chebyshev filter part can not meet these high requests, conventionally way is between non-conterminous resonant cavity, to introduce extra cross-couplings, at stopband, produce limited transmission zero, to improve the rejection of passband band edge.
In traditional coaxial cavity filter, the realization of transmission zero is on the dividing wall between two resonators, to fix a coupling assembly, or with windowing, cross-line, the modes such as absorbing cavity realize.Capacitive coupling assembly is by insulated support, the compositions such as metallic conductor, and inductance cross-couplings is to adjust spiral shell or cross-line mode to realize, and absorbing cavity is comprised of resonant column and tuning screw.
The realization of transmission zero is at present had relatively high expectations to cavity topological structure, and structure is comparatively complicated.
Summary of the invention
Object of the present invention be exactly in order to overcome the defect that above-mentioned prior art exists, provide a kind of simple in structure, compact, debug the coaxial cavity filter of realizing easily transmission zero.
Object of the present invention can be achieved through the following technical solutions:
A kind of coaxial cavity filter of realizing transmission zero, it is characterized in that, comprise cavity, resonant column, two branch lines, two radio frequency connectors and cross-couplings element, two described radio frequency connectors are located at cavity two ends, and be connected with the branch line of homonymy, described resonant column, cross-couplings element are located in cavity respectively.
The number of described resonant column is identical with the chamber number of filter.
Described branch line is provided with tuning screw, fixed block, and described branch line is fixed in cavity by fixed block.
Described fixed block is insulated support or metal earthing block.
Described cross-couplings element comprises cross coupling capacitor and cross-couplings inductance.
Compared with prior art, the following advantage of the present invention:
1) to the no requirement (NR) of cavity topological structure, simple in structure, compact, can utilize the cavity space of arranging;
2) debugging is convenient, at low frequency or the high frequency of filter, all can produce zero point.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of coaxial cavity filter of realizing transmission zero, comprise cavity 1, resonant column 2, two branch lines 3, two radio frequency connectors 4 and cross-couplings elements 5, two described radio frequency connectors 4 are located at cavity 1 two ends, and be connected with the branch line 3 of homonymy, described resonant column 2, cross-couplings element 5 are located at respectively in cavity 1.
The number of described resonant column 2 is identical with the chamber number of filter.Described branch line 3 is provided with tuning screw, fixed block, and described branch line 3 is fixed in cavity 1 by fixed block.Described fixed block is insulated support or metal earthing block.Described cross-couplings element 5 comprises cross coupling capacitor and cross-couplings inductance.
The implementation of this transmission zero is at the approximate 1/4 wavelength open line of port tap one section of odd-multiple in parallel of filter radio frequency connector 4 or the approximate 1/2 wavelength short-circuit line of odd-multiple; Branch line 3 use insulated supports and screw fit are fixed on cavity bottom surface, or are fixed on cavity bottom surface with metal earthing rod and screw; Can be by adjusting spiral shell to finely tune at branch line 3 tops.
Claims (5)
1. a coaxial cavity filter of realizing transmission zero, it is characterized in that, comprise cavity, resonant column, two branch lines, two radio frequency connectors and cross-couplings element, two described radio frequency connectors are located at cavity two ends, and be connected with the branch line of homonymy, described resonant column, cross-couplings element are located in cavity respectively.
2. a kind of coaxial cavity filter of realizing transmission zero according to claim 1, is characterized in that, the number of described resonant column is identical with the chamber number of filter.
3. a kind of coaxial cavity filter of realizing transmission zero according to claim 1, is characterized in that, described branch line is provided with tuning screw, fixed block, and described branch line is fixed in cavity by fixed block.
4. a kind of coaxial cavity filter of realizing transmission zero according to claim 3, is characterized in that, described fixed block is insulated support or metal earthing block.
5. a kind of coaxial cavity filter of realizing transmission zero according to claim 1, is characterized in that, described cross-couplings element comprises cross coupling capacitor and cross-couplings inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110197766.XA CN102881973B (en) | 2011-07-14 | 2011-07-14 | Coaxial cavity filter achieving transmission zero |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110197766.XA CN102881973B (en) | 2011-07-14 | 2011-07-14 | Coaxial cavity filter achieving transmission zero |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102881973A CN102881973A (en) | 2013-01-16 |
| CN102881973B true CN102881973B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110197766.XA Expired - Fee Related CN102881973B (en) | 2011-07-14 | 2011-07-14 | Coaxial cavity filter achieving transmission zero |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109314294B (en) * | 2016-06-17 | 2020-03-20 | 华为技术有限公司 | Multiplexer and equipment |
| CN112635940B (en) * | 2020-12-22 | 2022-06-14 | 华沣通信科技有限公司 | Cavity-in-line symmetrical capacitor device of cavity filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling device |
| CN101471472A (en) * | 2007-12-27 | 2009-07-01 | 奥雷通光通讯设备（上海）有限公司 | Coupling structure of filter |
| CN101599565A (en) * | 2009-04-30 | 2009-12-09 | 成都赛纳赛德科技有限公司 | Compact FSS short branch section filter |
| CN202167591U (en) * | 2011-07-14 | 2012-03-14 | 凯镭思通讯设备（上海）有限公司 | Coaxial cavity filter for realizing transmission zero |
-
2011
- 2011-07-14 CN CN201110197766.XA patent/CN102881973B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2881986Y (en) * | 2006-03-29 | 2007-03-21 | 摩比天线技术（深圳）有限公司 | Combined cross coupling device |
| CN101471472A (en) * | 2007-12-27 | 2009-07-01 | 奥雷通光通讯设备（上海）有限公司 | Coupling structure of filter |
| CN101599565A (en) * | 2009-04-30 | 2009-12-09 | 成都赛纳赛德科技有限公司 | Compact FSS short branch section filter |
| CN202167591U (en) * | 2011-07-14 | 2012-03-14 | 凯镭思通讯设备（上海）有限公司 | Coaxial cavity filter for realizing transmission zero |
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| Publication number | Publication date |
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| CN102881973A (en) | 2013-01-16 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20190714 |