CN104092445A - Absorptive wave filter - Google Patents
Absorptive wave filter Download PDFInfo
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- CN104092445A CN104092445A CN201410376068.XA CN201410376068A CN104092445A CN 104092445 A CN104092445 A CN 104092445A CN 201410376068 A CN201410376068 A CN 201410376068A CN 104092445 A CN104092445 A CN 104092445A
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Abstract
The invention belongs to an absorptive reflection-less wave filter in the field of components of a communication technology. The wave filter comprises two ports, three transformers, two RC (Resistance-Capacitance) series units and a transmission wire. The absorptive reflection-less wave filter disclosed by the invention has a function of absorbing an internal stop band signal, has relatively high adaptability to signal strength fluctuation and signal frequency fluctuation, can conveniently operate within a range from a low frequency to a high frequency, is high in efficiency and has good application prospects.
Description
Technical field
The invention 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, carried out a series of research about filter circuit both at home and abroad.Obtained a lot of achievements in research, be especially used in wireless mobile telecommunication technology, used in power amplifier front end and radar antenna feed part, filter circuit is the large problem of resolution system passband external noise effectively.And filter is as the one of filter, there is the effect that suppresses unnecessary frequency signal.All kinds of corrupt practices creep in for traditional filter tool based on signal reflex, such as the signal that stopband attenuation is little, port match is poor, port reflects back has a strong impact on systematic function etc.Absorbing mode filter is by absorbing can fundamentally address this problem completely resistance inband signaling.And the centre frequency that effectively realizes filter is adjustable, the function that realizes linear phase.
Summary of the invention
The object of the invention is the defect existing for background technology, improve a kind of absorbing mode filter of design, the defect existing to overcome background technology, reaches the characteristic that this filter center frequency is adjustable, have linear phase simultaneously.Realize production technology easy, to the strong adaptability of signal strength signal intensity fluctuation and signal frequency fluctuation, in production, only need to adjust capacitor
parameter can make from low frequency to high frequency different frequency range the corresponding band resistance of application.
Solution of the present invention is the defect existing for background technology, adopts a kind of compound lamped element and microstrip line circuit structure, improves a kind of absorbing mode filter of design; This absorbing mode filter comprises that two ports, three transformers, two RC series units and transmission line form; Wherein, port one is connected with the port one of transformer XF1; The port 3 of transformer XF1 is connected with resistance R 1, and the end 2 of transformer XF1 is connected to the ground and connects respectively with end 4; The other end of R1 is connected with capacitor C 1, and the other end of capacitor C 1 is connected with 1 end of transformer 2; The port 3 of transformer XF2 is connected with one end of capacitor C 2, and the other end of capacitor C 2 is connected with one end of resistance R 2, and the other end of resistance R 2 is connected with 2 ends of transformer XF3; The end 2 of transformer XF2 is connected to the ground and connects respectively with end 4; 2 ends of transformer XF3 are connected with port 2 (Port2); ; The end 1 of transformer XF2 is connected to the ground and connects respectively with end 3; 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 adjusting the value of capacitor C 1 and C2, can change the centre frequency of filter.By adjusting the transformation ratio of transformer, can adjust absorption signal.Transmission line adopts microstrip line, is mainly used to realize the conversion of impedance, reaches the object of the outer transmission zero of accommodation zone.
The present invention utilizes the composite construction of lamped element and microstrip line to realize inhibition and the absorption to stopband signal, realizes the function of passband signal transmission; This absorbing mode filter can absorb resistance inband signaling well, thereby has solved the problem that suppressed signal impacts filter front-end circuit.Thereby the present invention has the adjustable function of centre frequency, and there is linear phase; Production technology is easy, performance is stable, reliability is high making for device, to the strong adaptability of signal strength signal intensity fluctuation and signal frequency fluctuation, can easily realize in the very wide frequency range from low frequency to high frequency and working, productivity ratio is high, has the features such as good application prospect in modern communications electronic system.
Brief description of the drawings
Fig. 1 is a kind of absorbing mode filter circuit diagram of the present invention.
Fig. 2 is a kind of absorbing mode filter S of the present invention parameter characteristic curve chart.
Embodiment
Embodiment 1
The present embodiment is taking the stopband center frequency of absorbing mode filter as 2GHz is as example: 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 that signal reflex coefficient, S21 are signal propagation coefficient; From Fig. 2, can find out: the present embodiment is fine to signal suppressing in stopband, be absorbed resistance absorption completely, not occur reflected signal.In the time that the transmission line in example is got different length, can change the outer transmission zero of band of this filter.In the time that the capacitor C 1 in circuit is adjusted with C2, can change the centre frequency of filter.
The present embodiment has the adjustable function of filter center frequency.Designed have linear phase filter oneself successfully for wireless WLAN mobile communication, through the modulation and demodulation of FSK, Output rusults is good.Use result to show that this device has good inhibition degree to channel receiver modulating pulse and noise level, has effectively overcome the shortcoming of conventional filter.Can ensure that device obtains best channel signal laser propagation effect.
Claims (4)
1. an absorbing mode filter, comprises that two ports, three transformers, two RC series units and transmission line form;
Wherein, port one is connected with the port one of transformer XF1; The port 3 of transformer XF1 is connected with resistance R 1, and the end 2 of transformer XF1 is connected to the ground and connects respectively with end 4; The other end of R1 is connected with capacitor C 1, and the other end of capacitor C 1 is connected with 1 end of transformer 2; The port 3 of transformer XF2 is connected with one end of capacitor C 2, and the other end of capacitor C 2 is connected with one end of resistance R 2, and the other end of resistance R 2 is connected with 2 ends of transformer XF3; The end 2 of transformer XF2 is connected to the ground and connects respectively with end 4; 2 ends of transformer XF3 are connected with port 2 (Port2); ; The end 1 of transformer XF2 is connected to the ground and connects respectively with end 3; 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: by adjusting the value of capacitor C 1 and C2, can change the centre frequency of filter.
3. by absorbing mode filter described in claim 1, it is characterized in that: by adjusting the transformation ratio of transformer, can adjust absorption signal.
4. by absorbing mode filter described in claim 1, it is characterized in that: transmission line adopts microstrip line, is mainly used to realize the conversion of impedance, reach the object of the outer transmission zero of accommodation zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410376068.XA CN104092445A (en) | 2014-08-02 | 2014-08-02 | Absorptive wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410376068.XA CN104092445A (en) | 2014-08-02 | 2014-08-02 | Absorptive wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104092445A true CN104092445A (en) | 2014-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410376068.XA Pending CN104092445A (en) | 2014-08-02 | 2014-08-02 | Absorptive wave filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993802A (en) * | 2015-08-01 | 2015-10-21 | 徐园园 | Adjustable band stop filter circuit |
| CN109004912A (en) * | 2018-07-18 | 2018-12-14 | 南京邮电大学 | The low reflection-absorption formula filter of symmetrical dual-port |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078605A (en) * | 2012-11-04 | 2013-05-01 | 王少夫 | High-frequency ultra-wideband power limiter design method |
| CN103840691A (en) * | 2012-11-20 | 2014-06-04 | 深圳科士达科技股份有限公司 | High-frequency link inverter of single-stage bidirectional buck DC converter type |
| CN204068884U (en) * | 2014-08-02 | 2014-12-31 | 王少夫 | A kind of absorbing mode filter |
-
2014
- 2014-08-02 CN CN201410376068.XA patent/CN104092445A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078605A (en) * | 2012-11-04 | 2013-05-01 | 王少夫 | High-frequency ultra-wideband power limiter design method |
| CN103840691A (en) * | 2012-11-20 | 2014-06-04 | 深圳科士达科技股份有限公司 | High-frequency link inverter of single-stage bidirectional buck DC converter type |
| CN204068884U (en) * | 2014-08-02 | 2014-12-31 | 王少夫 | A kind of absorbing mode filter |
Non-Patent Citations (1)
| Title |
|---|
| 韩世虎: "广义切比雪夫滤波器和波导双工器理论与关键技术研究", 《中国博士学位论文全文数据库信息科技辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993802A (en) * | 2015-08-01 | 2015-10-21 | 徐园园 | Adjustable band stop filter circuit |
| CN109004912A (en) * | 2018-07-18 | 2018-12-14 | 南京邮电大学 | The low reflection-absorption formula filter of symmetrical dual-port |
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Application publication date: 20141008 |
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