CN203166050U - Optimized band elimination filter - Google Patents
Optimized band elimination filter Download PDFInfo
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- CN203166050U CN203166050U CN 201320071439 CN201320071439U CN203166050U CN 203166050 U CN203166050 U CN 203166050U CN 201320071439 CN201320071439 CN 201320071439 CN 201320071439 U CN201320071439 U CN 201320071439U CN 203166050 U CN203166050 U CN 203166050U
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Abstract
The utility model relates to an optimized band elimination filter which comprises a body and a cover plate. Resonant cavities are formed in one surface, which is adjacent to the cover plate, of the body, and harmonic oscillators are arranged inside the resonant cavities. An input terminal and an output terminal are respectively arranged on two opposite side walls of the body, a groove is formed in the cover plate, and the groove is in one surface, which is adjacent to the cover plate, of the body. Coupling transmission lines are arranged inside the groove, and two ends of the coupling transmission lines are respectively connected with the input terminal and the output terminal. The transmission lines are provided with taps, the number of the taps is equal to that of the resonant cavities, and the taps stretch into corresponding resonant cavities in a one-to-one correspondence mode. The optimized band elimination filter is characterized in that lengths of the transmission lines between two adjacent harmonic oscillators are not equal to one fourth of the wavelength of a center frequency, and the lengths of the transmission lines between two adjacent harmonic oscillators are different. The optimized band elimination filter is small in loss and high in output power, can prevent the situations that output signals lack fidelity and users can hardly receive the signals from occurring, and is suitable for wireless communication base stations.
Description
Technical field
The utility model relates to a kind of filter.Specifically, be the optimization RF band stop filter that radio communication base station is used.
Background technology
At present, the band stop filter that uses in the radio communication base station all is conventional filter.This conventional filter contains body and cover plate, on the body one side adjacent with cover plate resonant cavity is arranged, and harmonic oscillator is arranged in the resonant cavity.Body has input terminal and lead-out terminal respectively on the relative two side, and is fluted on the cover plate, and this groove is on the body one side adjacent with cover plate, and coupled transmission line is arranged in the groove, and the two ends of coupled transmission line link to each other with lead-out terminal with input terminal respectively.Tap is arranged on the transmission line, and described number of taps equates with described resonant cavity quantity, and described tap is stretched in the corresponding resonant cavity correspondingly.Length of transmission line between its adjacent two harmonic oscillators of the filter of this structure is equal to 1/4 of centre frequency wavelength, and the identical length between adjacent two harmonic oscillators together.The response curve of this filter is seen the curve 1 among Fig. 2, and by this curve as can be seen, this filter is optimization not, the slope of its low frequency end and front end is all less, makes that the differential loss of this filter is bigger, and power output is low, the output signal distortion, the user is difficult to receive.
The utility model content
Problem to be solved in the utility model provides a kind of optimization band stop filter.This optimization band stop filter, differential loss is little, the power output height, the situation that can avoid output signal distortion, user to be difficult to receive takes place.
For addressing the above problem, take following technical scheme:
Optimization band stop filter of the present utility model comprises body and cover plate, on the body one side adjacent with cover plate resonant cavity is arranged, and harmonic oscillator is arranged in the resonant cavity.Input terminal and lead-out terminal are arranged respectively on the two lateral walls of body, and fluted on the described cover plate, this groove is on the body one side adjacent with cover plate, and coupled transmission line is arranged in the groove, and the two ends of coupled transmission line link to each other with lead-out terminal with input terminal respectively.Tap is arranged on the coupled transmission line, and described number of taps equates with described resonant cavity quantity, and described tap is stretched in the corresponding resonant cavity correspondingly.Be characterized in that the coupled transfer line length between adjacent two harmonic oscillators all is not equal to 1/4 of centre frequency wavelength, and the coupled transfer line length between adjacent two harmonic oscillators is all inequality.
Take such scheme, have the following advantages:
By such scheme as can be seen, because the length between its adjacent two harmonic oscillators of filter of the present utility model and be not equal to 1/4 of centre frequency wavelength, and the length between adjacent two harmonic oscillators is all inequality.Make the inhibition curve steeper of its low frequency end and front end, slope become big.Thereby reduced differential loss, improved power output, the situation of having avoided output signal distortion, user to be difficult to receive takes place.
Description of drawings
Fig. 1 is optimization band stop filter structure schematic diagram of the present utility model, has omitted cover plate among the figure;
Fig. 2 is the A-A cross-sectional schematic of Fig. 1;
Fig. 3 is conventional filter response curve and filter response curve contrast figure of the present utility model.
Embodiment
As depicted in figs. 1 and 2, optimization band stop filter of the present utility model comprises body 4 and cover plate 9, and described body 4 is aluminium alloy plate, is processed with six resonant cavitys 1 on its one side, is furnished with cover plate 9 on the one side adjacent with resonant cavity 1 oral area.Be provided with harmonic oscillator 3 in each resonant cavity 1.Difference cross machine hole on relative two sidewalls of body 4, be separately installed with input terminal 2 and lead-out terminal 8 in two transverse holes, be processed with groove on the described cover plate 9, this groove is on the body adjacent with cover plate 94 one sides, be provided with coupled transmission line 6 in the groove, the two ends of coupled transmission line 6 link to each other with lead-out terminal 8 with input terminal 2 respectively.Be processed with tap 7 on the coupled transmission line 6, the quantity of described tap 7 equates with the quantity of described resonant cavity 1, and described tap 7 is stretched in the corresponding resonant cavity 1 correspondingly.Coupled transmission line 6 length that two adjacent harmonic oscillators are 3 all are not equal to 1/4 of centre frequency wavelength, coupled transmission line 6 length that are 3 of adjacent two harmonic oscillators can be greater than 1/4 of centre frequency wavelength, also can be less than 1/4 of centre frequency wavelength, and the length of 3 of adjacent two harmonic oscillators is all inequality.In the present embodiment, coupled transmission line 6 length of 3 of first harmonic oscillator 3 and second harmonic oscillators are 60 of centre frequencies
o, coupled transmission line 6 length that second harmonic oscillator 3 and the 3rd harmonic oscillator are 3 are 68 of centre frequencies
o, coupled transmission line 6 length that the 3rd harmonic oscillator 3 and the 4th harmonic oscillator are 3 are 88 of centre frequencies
o, coupled transmission line 6 length that the 4th harmonic oscillator 3 and the 5th harmonic oscillator are 3 are 103 of centre frequencies
o, coupled transmission line 6 length that the 5th harmonic oscillator 3 and the 6th harmonic oscillator are 3 are 113 of centre frequencies
o
In two response curves shown in Figure 3, curve 1 is the response curve of conventional filter (length of transmission line between adjacent two harmonic oscillators be equal to centre frequency wavelength 1/4), and curve 2 is response curves of optimization band stop filter.As seen from Figure 2, the response curve of conventional filter is all less at the slope of low frequency end and front end, makes that the differential loss of this filter is bigger, and power output is low, the output signal distortion, and the user is difficult to receive.And the low frequency end of curve 2 and front end steeper all, namely slope is bigger.Thereby reduced differential loss, improved power output, the situation of having avoided output signal distortion, user to be difficult to receive takes place.
Claims (1)
1. an optimization band stop filter comprises body (4) and cover plate (9), on body (4) one side adjacent with cover plate (9) resonant cavity (1) is arranged, and harmonic oscillator (3) is arranged in the resonant cavity (1); Input terminal (2) and lead-out terminal (8) are arranged respectively on the two lateral walls of body (4), described cover plate (9) is gone up fluted, this groove is on body (4) one side adjacent with cover plate (9), coupled transmission line (6) is arranged in the groove, and the two ends of coupled transmission line (6) link to each other with lead-out terminal (8) with input terminal (2) respectively; Tap (7) is arranged on the coupled transmission line (6), and the quantity of described tap (7) equates with the quantity of described resonant cavity (1), and described tap (7) is stretched in the corresponding resonant cavity (1) correspondingly; It is characterized in that coupled transmission line (6) length between adjacent two harmonic oscillators (3) all is not equal to 1/4 of centre frequency wavelength, and the length of the coupled transmission line (6) between adjacent two harmonic oscillators (3) is all inequality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320071439 CN203166050U (en) | 2013-02-07 | 2013-02-07 | Optimized band elimination filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320071439 CN203166050U (en) | 2013-02-07 | 2013-02-07 | Optimized band elimination filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166050U true CN203166050U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320071439 Expired - Fee Related CN203166050U (en) | 2013-02-07 | 2013-02-07 | Optimized band elimination filter |
Country Status (1)
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| CN (1) | CN203166050U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107395A (en) * | 2013-02-07 | 2013-05-15 | 江苏贝孚德通讯科技股份有限公司 | Optimizing band elimination filter |
| CN106329045A (en) * | 2016-08-30 | 2017-01-11 | 成都赛纳微波科技有限公司 | Cylindrical cavity ridge coupling band-stop filter |
| CN106329047A (en) * | 2016-08-30 | 2017-01-11 | 成都赛纳微波科技有限公司 | Non-insulated band-stop filter |
| CN111384547A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Filter applied to 5G communication system and communication equipment |
-
2013
- 2013-02-07 CN CN 201320071439 patent/CN203166050U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107395A (en) * | 2013-02-07 | 2013-05-15 | 江苏贝孚德通讯科技股份有限公司 | Optimizing band elimination filter |
| CN106329045A (en) * | 2016-08-30 | 2017-01-11 | 成都赛纳微波科技有限公司 | Cylindrical cavity ridge coupling band-stop filter |
| CN106329047A (en) * | 2016-08-30 | 2017-01-11 | 成都赛纳微波科技有限公司 | Non-insulated band-stop filter |
| CN111384547A (en) * | 2018-12-29 | 2020-07-07 | 深圳市大富科技股份有限公司 | Filter applied to 5G communication system and communication equipment |
| CN111384547B (en) * | 2018-12-29 | 2022-07-12 | 大富科技(安徽)股份有限公司 | Filter applied to 5G communication system and communication equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130828 Termination date: 20200207 |