CN202167591U - Coaxial cavity filter for realizing transmission zero - Google Patents
Coaxial cavity filter for realizing transmission zero Download PDFInfo
- Publication number
- CN202167591U CN202167591U CN2011202496906U CN201120249690U CN202167591U CN 202167591 U CN202167591 U CN 202167591U CN 2011202496906 U CN2011202496906 U CN 2011202496906U CN 201120249690 U CN201120249690 U CN 201120249690U CN 202167591 U CN202167591 U CN 202167591U
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- transmission zero
- cavity
- filter
- cross
- realizing transmission
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Abstract
The utility model relates to a coaxial cavity filter for realizing transmission zero, comprising a cavity body, a resonance column, two branch wires, two radio-frequency connectors and a cross coupling element, wherein the two radio-frequency connectors are arranged at two ends of the cavity body and are connected with the branch line at the same side; and the resonance column and the cross coupling element are arranged in the cavity body respectively. Compared with the prior art, the coaxial cavity filter has the advantages of simple and compact structure, convenience in debugging, and the like.
Description
Technical field
The utility model relates to a kind of filter, especially relates 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 crowded day by day; Performance index to filter have proposed increasingly high requirement; The RF band pass filter of low insertion loss becomes very important in high selectivity, small size, the passband, and conventional Chebyshev filter spare can not satisfy these high requests, and way is between non-conterminous resonant cavity, to introduce extra cross-couplings usually; Produce limited transmission zero at stopband, to improve the rejection of passband band edge.
In traditional coaxial cavity filter, the realization of transmission zero is a fixing coupling assembly on the dividing wall between two resonators, or with windowing, cross-line, modes such as absorbing cavity realize.The capacitive coupling assembly is by insulated support, compositions such as metallic conductor, and the inductance cross-couplings realizes that to transfer spiral shell or cross-line mode absorbing cavity is made up of resonance post and tuning screw.
The realization of transmission zero is at present had relatively high expectations to the cavity topological structure, and structure is comparatively complicated.
The utility model content
The purpose of the utility model be exactly provide in order to overcome the defective that above-mentioned prior art exists a kind of simple in structure, compact, debug the coaxial cavity filter of realizing transmission zero easily.
The purpose of the utility model can realize through following technical scheme:
A kind of coaxial cavity filter of realizing transmission zero; It is characterized in that; Comprise cavity, resonance post, two branch lines, two radio frequency connectors and cross-couplings element; Described two radio frequency connectors are located at the cavity two ends, and are connected with the branch line of homonymy, and described resonance post, cross-couplings element are located in the cavity respectively.
The number of described resonance post 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 the cavity through fixed block.
Described fixed block is insulated support or metal ground connection piece.
Described cross-couplings element comprises cross coupling capacitor and cross-couplings inductance.
Compared with prior art, the following advantage of the utility model:
1) to the no requirement (NR) of cavity topological structure, cavity simple in structure, compact, the capable of using space of arranging;
2) debugging is convenient, all can produce zero point at the low frequency or the high frequency of filter.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1; A kind of coaxial cavity filter of realizing transmission zero; Comprise cavity 1, resonance post 2, two branch lines 3, two radio frequency connectors 4 and cross-couplings elements 5; Described two radio frequency connectors 4 are located at cavity 1 two ends, and are connected with the branch line 3 of homonymy, and described resonance post 2, cross-couplings element 5 are located at respectively in the cavity 1.
The number of described resonance post 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 the cavity 1 through fixed block.Described fixed block is insulated support or metal ground connection piece.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 one section odd of port tap parallel connection of filter radio frequency connector 4 or the approximate 1/2 wavelength short-circuit line of odd; Branch line 3 usefulness insulated supports and screw fit are fixed on the cavity bottom surface, or with metal earthing rod and screw in the cavity bottom surface; Can finely tune through transferring spiral shell at branch line 3 tops.
Claims (5)
1. coaxial cavity filter of realizing transmission zero; It is characterized in that; Comprise cavity, resonance post, two branch lines, two radio frequency connectors and cross-couplings element; Described two radio frequency connectors are located at the cavity two ends, and are connected with the branch line of homonymy, and described resonance post, cross-couplings element are located in the 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 resonance post 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 the cavity through 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 ground connection piece.
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 |
|---|---|---|---|
| CN2011202496906U CN202167591U (en) | 2011-07-14 | 2011-07-14 | Coaxial cavity filter for realizing transmission zero |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202496906U CN202167591U (en) | 2011-07-14 | 2011-07-14 | Coaxial cavity filter for realizing transmission zero |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202167591U true CN202167591U (en) | 2012-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202496906U Withdrawn - After Issue CN202167591U (en) | 2011-07-14 | 2011-07-14 | Coaxial cavity filter for realizing transmission zero |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202167591U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881973A (en) * | 2011-07-14 | 2013-01-16 | 凯镭思通讯设备（上海）有限公司 | Coaxial cavity filter achieving transmission zero |
| CN104167579A (en) * | 2014-08-07 | 2014-11-26 | 董后友 | Low-loss and high-stability DCS filter |
-
2011
- 2011-07-14 CN CN2011202496906U patent/CN202167591U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881973A (en) * | 2011-07-14 | 2013-01-16 | 凯镭思通讯设备（上海）有限公司 | Coaxial cavity filter achieving transmission zero |
| CN102881973B (en) * | 2011-07-14 | 2014-12-10 | 凯镭思通讯设备（上海）有限公司 | Coaxial cavity filter achieving transmission zero |
| CN104167579A (en) * | 2014-08-07 | 2014-11-26 | 董后友 | Low-loss and high-stability DCS filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120314 Effective date of abandoning: 20141210 |
|
| RGAV | Abandon patent right to avoid regrant |