CN204068884U - A kind of absorbing mode filter - Google Patents
A kind of absorbing mode filter Download PDFInfo
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- CN204068884U CN204068884U CN201420432076.7U CN201420432076U CN204068884U CN 204068884 U CN204068884 U CN 204068884U CN 201420432076 U CN201420432076 U CN 201420432076U CN 204068884 U CN204068884 U CN 204068884U
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- transformer
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- mode filter
- filter
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Abstract
The utility model belongs to the absorbing mode filter in communication technology components and parts field, comprises two ports, three transformers, two RC series units and transmission lines realize.This utility model has the function of signal in absorption band resistance, and have higher adaptability to signal strength signal intensity fluctuation and signal frequency fluctuation, conveniently can realize frequency ranges of operation from low to high, efficiency is high, has good application prospect.
Description
Technical field
The utility model belongs to the filter in communication technology components and parts field, particularly a kind of absorption reflectionless filter.
Background technology
In the last few years, a series of research about filter circuit had been carried out both at home and abroad.Achieve a lot of achievement in research, be especially used in wireless mobile telecommunication technology, be used in power-amplifier front-end and radar antenna feed part, filter circuit effectively can solve the large problem of system passband external noise.And filter is as the one of filter, there is the effect suppressing unnecessary frequency signal.All kinds of corrupt practices creep in for traditional filter tool based on signal reflex, and the signal that such as stopband attenuation is little, port match is poor, port reflects goes back has a strong impact on systematic function etc.Absorbing mode filter is by absorbing can fundamentally address this problem completely to resistance inband signaling.And effectively realize the regulable center frequency of filter, realize the function of linear phase.
Summary of the invention
The purpose of this utility model is the defect existed for background technology, and a kind of absorbing mode filter of Curve guide impeller, to overcome the defect that background technology exists, reaches the characteristic that this filter centre frequency is adjustable, have linear phase simultaneously.Realize production technology easy, to the strong adaptability that signal strength signal intensity fluctuation and signal frequency are fluctuated, in production, only need adjust capacitor
the parameter corresponding band that can obtain the application of different frequency range from low to high hinder.
Solution of the present utility model is the defect existed for background technology, adopts a kind of lamped element and microstrip circuitry structure of compound, a kind of absorbing mode filter of Curve guide impeller; This absorbing mode filter comprises two ports, three transformers, two RC series units and transmission lines are formed; Wherein, port one is connected with the port one of transformer XF1; The port 3 of transformer XF1 is connected with resistance R1, and the end 2 of transformer XF1 is connected to the ground respectively with end 4 and connects; The other end of R1 is connected with electric capacity C1, and the other end of electric capacity C1 is connected with 1 end of transformer 2; The port 3 of transformer XF2 is connected with one end of electric capacity C2, and the other end of electric capacity C2 is connected with one end of resistance R2, and the other end of resistance R2 is connected with 2 ends of transformer XF3; The end 2 of transformer XF2 is connected to the ground respectively with end 4 and connects; 2 ends of transformer XF3 are connected with port 2 (Port2); ; The end 1 of transformer XF2 is connected to the ground respectively with end 3 and connects; The two ends of transmission line TL respectively with port one, port 2 is connected; Input port 1 (Port1), output port 2 (Port2) all connect 50 ohmages.By the value of adjustment electric capacity C1 and C2, the centre frequency of filter can be changed.By adjusting the transformation ratio of transformer, can adjust absorption signal.Transmission line adopts microstrip line, is mainly used to the conversion realizing impedance, reaches the object of the outer transmission zero of accommodation zone.
The utility model utilizes the composite construction of lamped element and microstrip line to achieve suppression to stopband signal and absorption, realizes the function of passband signal transmission; This absorbing mode filter can absorb resistance inband signaling well, thus solves the problem that suppressed signal impacts filter front end circuit.Thus the utility model has the function of regulable center frequency, and has linear phase; Production technology is easy, device stable performance in making, reliability are high, to the strong adaptability that signal strength signal intensity fluctuation and signal frequency are fluctuated, easily can realize very wide frequency ranges of operation from low to high, productivity ratio is high, has the features such as good application prospect in modern communications electronic system.
Accompanying drawing explanation
Fig. 1 is a kind of absorbing mode filter circuit diagram of the utility model.
Fig. 2 is a kind of absorbing mode filter S of the utility model parameter characteristic figure.
Embodiment
Embodiment 1
The present embodiment for the stopband center frequency of absorbing mode filter for 2GHz: the employing lumped-parameter element of the present embodiment and the circuit structure of microstrip line are as shown in accompanying drawing 1, accompanying drawing 2 is the S parameters simulation curve chart of the present embodiment filter, and in figure, S11 is signal reflex coefficient, S21 is signal propagation coefficient; Can find out from Fig. 2: the present embodiment is fine to signal suppressing in stopband, is absorbed by absorption resistance completely, does not occur reflected signal.When the transmission line in example gets different length, the outer transmission zero of band of this filter can be changed.When electric capacity C1 and the C2 in circuit adjusts, the centre frequency of filter can be changed.
The utility model has the adjustable function of filter centre frequency.Designed by there is linear phase filter oneself be used successfully in wireless WLAN mobile communication, through the modulation and demodulation of FSK, Output rusults is good.Use result to show that this device has good degree of suppression to channel receiver modulating pulse and noise level, effectively overcome the shortcoming of conventional filter.Can ensure that device obtains best channel signal transmission effect.
Claims (2)
1. an absorbing mode filter, is characterized in that: comprise two ports, three transformers, two RC series units and transmission lines are formed; Wherein, port one is connected with the port one of transformer XF1; The port 3 of transformer XF1 is connected with resistance R1, and the end 2 of transformer XF1 is connected to the ground respectively with end 4 and connects; The other end of R1 is connected with electric capacity C1, and the other end of electric capacity C1 is connected with 1 end of transformer 2; The port 3 of transformer XF2 is connected with one end of electric capacity C2, and the other end of electric capacity C2 is connected with one end of resistance R2, and the other end of resistance R2 is connected with 2 ends of transformer XF3; The end 2 of transformer XF2 is connected to the ground respectively with end 4 and connects; 2 ends of transformer XF3 are connected with port 2 (Port2); ; The end 1 of transformer XF2 is connected to the ground respectively with end 3 and connects; The two ends of transmission line TL respectively with port one, port 2 is connected; Input port 1 (Port1), output port 2 (Port2) all connect 50 ohmages.。
2. by absorbing mode filter described in claim 1, it is characterized in that: transmission line adopts microstrip line, is mainly used to the conversion realizing impedance, reach the object of the outer transmission zero of accommodation zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420432076.7U CN204068884U (en) | 2014-08-02 | 2014-08-02 | A kind of absorbing mode filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420432076.7U CN204068884U (en) | 2014-08-02 | 2014-08-02 | A kind of absorbing mode filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068884U true CN204068884U (en) | 2014-12-31 |
Family
ID=52210324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420432076.7U Expired - Fee Related CN204068884U (en) | 2014-08-02 | 2014-08-02 | A kind of absorbing mode filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204068884U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092445A (en) * | 2014-08-02 | 2014-10-08 | 王少夫 | Absorptive wave filter |
| CN108389595A (en) * | 2018-02-28 | 2018-08-10 | 江苏华存电子科技有限公司 | USB3.0 Portable disks filtering method and filter circuit |
-
2014
- 2014-08-02 CN CN201420432076.7U patent/CN204068884U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092445A (en) * | 2014-08-02 | 2014-10-08 | 王少夫 | Absorptive wave filter |
| CN108389595A (en) * | 2018-02-28 | 2018-08-10 | 江苏华存电子科技有限公司 | USB3.0 Portable disks filtering method and filter circuit |
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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 |
Granted publication date: 20141231 Termination date: 20150802 |
|
| EXPY | Termination of patent right or utility model |