CN103107395A - Optimizing band elimination filter - Google Patents
Optimizing band elimination filter Download PDFInfo
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- CN103107395A CN103107395A CN2013100494810A CN201310049481A CN103107395A CN 103107395 A CN103107395 A CN 103107395A CN 2013100494810 A CN2013100494810 A CN 2013100494810A CN 201310049481 A CN201310049481 A CN 201310049481A CN 103107395 A CN103107395 A CN 103107395A
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Abstract
The invention relates to an optimizing band elimination filter which comprises a body and a cover plate. Resonant cavities are formed in one side, 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, 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. Taps are arranged on the transmission lines, the number of the taps is equal to that of the resonant cavities, and the taps stretch into corresponding resonant cavities in an each to each mode. The optimizing 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 all in equal. The optimizing 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 present invention relates to a kind of filter.Specifically, be the optimization RF/Microwave band stop filter that radio communication base station is used.
Background technology
At present, the band stop filter that uses in radio communication base station is all 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 resonant cavity.Body has respectively input terminal and lead-out terminal on relative two side, and is fluted on cover plate, and this groove is on the body one side adjacent with cover plate, and coupled transmission line is arranged in groove, and the two ends of coupled transmission line are connected with lead-out terminal with input terminal respectively.Tap is arranged on transmission line, and described number of taps equates with described resonant cavity quantity, and described tap is stretched in 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 is same.The response curve of this filter is seen the curve 1 in Fig. 2, can be found out by this curve, and this filter is optimization not, the slope of its low frequency end and front end is all less, makes the differential loss of this filter larger, and power output is low, the output signal distortion, the user is difficult to receive.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of optimization band stop filter.This optimization band stop filter, differential loss is little, and power output is high, can avoid the situation that output signal distortion, user are difficult to receive to occur.
For addressing the above problem, take following technical scheme:
Optimization band stop filter of the present invention comprises body and cover plate, on the body one side adjacent with cover plate, resonant cavity is arranged, and harmonic oscillator is arranged in resonant cavity.Input terminal and lead-out terminal are arranged respectively on the two lateral walls of body, and fluted on described cover plate, this groove is on the body one side adjacent with cover plate, and coupled transmission line is arranged in groove, and the two ends of coupled transmission line are connected with lead-out terminal with input terminal respectively.Tap is arranged on coupled transmission line, and described number of taps equates with described resonant cavity quantity, and described tap is stretched in 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 not identical.
Take such scheme, have the following advantages:
Can be found out by such scheme, due to the length between its adjacent two harmonic oscillators of filter of the present invention and be not equal to 1/4 of centre frequency wavelength, and the length between adjacent two harmonic oscillators is all not identical.Make the inhibition curve steeper of its low frequency end and front end, it is large that slope becomes.Thereby reduced differential loss, improved power output, avoided the situation that output signal distortion, user are difficult to receive to occur.
Description of drawings
Fig. 1 is optimization band stop filter structure schematic diagram of the present invention, has omitted cover plate in 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 invention.
Embodiment
As depicted in figs. 1 and 2, optimization band stop filter of the present invention 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 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 groove, the two ends of coupled transmission line 6 are connected with lead-out terminal 8 with input terminal 2 respectively.Be processed with tap 7 on 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 corresponding resonant cavity 1 correspondingly.Coupled transmission line 6 length that two adjacent harmonic oscillator is 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 not identical.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 the differential loss of this filter larger, 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 larger.Thereby reduced differential loss, improved power output, avoided the situation that output signal distortion, user are difficult to receive to occur.
Claims (1)
1. an optimization band stop filter, comprise body (4) and cover plate (9), on body (4) one side adjacent with cover plate (9), resonant cavity (1) arranged, and harmonic oscillator (3) is arranged in 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 upper fluted, this groove is on body (4) one side adjacent with cover plate (9), coupled transmission line (6) is arranged in groove, and the two ends of coupled transmission line (6) are connected with lead-out terminal (8) with input terminal (2) respectively; Tap (7) is arranged on 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 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 not identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100494810A CN103107395A (en) | 2013-02-07 | 2013-02-07 | Optimizing band elimination filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100494810A CN103107395A (en) | 2013-02-07 | 2013-02-07 | Optimizing band elimination filter |
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| Publication Number | Publication Date |
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| CN103107395A true CN103107395A (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100494810A Pending CN103107395A (en) | 2013-02-07 | 2013-02-07 | Optimizing band elimination filter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4360793A (en) * | 1981-04-02 | 1982-11-23 | Rhodes John D | Extracted pole filter |
| CN200962447Y (en) * | 2006-09-29 | 2007-10-17 | 深圳国人通信有限公司 | Built-in coaxial cavity band resistance filter of the transmission line |
| CN203166050U (en) * | 2013-02-07 | 2013-08-28 | 江苏贝孚德通讯科技股份有限公司 | Optimized band elimination filter |
-
2013
- 2013-02-07 CN CN2013100494810A patent/CN103107395A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4360793A (en) * | 1981-04-02 | 1982-11-23 | Rhodes John D | Extracted pole filter |
| CN200962447Y (en) * | 2006-09-29 | 2007-10-17 | 深圳国人通信有限公司 | Built-in coaxial cavity band resistance filter of the transmission line |
| CN203166050U (en) * | 2013-02-07 | 2013-08-28 | 江苏贝孚德通讯科技股份有限公司 | Optimized band elimination filter |
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Application publication date: 20130515 |