CN204697023U - A kind of LC if bandpas filter - Google Patents
A kind of LC if bandpas filter Download PDFInfo
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- CN204697023U CN204697023U CN201520517953.5U CN201520517953U CN204697023U CN 204697023 U CN204697023 U CN 204697023U CN 201520517953 U CN201520517953 U CN 201520517953U CN 204697023 U CN204697023 U CN 204697023U
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Abstract
The utility model relates to a kind of filter, especially relates to a kind of LC if bandpas filter of Out-of-band rejection superior performance.5th rank series LC resonant circuit of the present utility model is parallel with feedback capacity C6 and shunt inductance L6, wherein, the input of feedback capacity C6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of feedback capacity C6, the input of shunt inductance L6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of shunt inductance L6.The utility model structure is simple, and volume is little, and frequency-selecting performance is good, in-band insertion loss is little, and Out-of-band rejection is strong, low cost of manufacture, is suitable for batch production, can be widely used in the occasion needing intermediate frequency filtering.
Description
[technical field]
The utility model relates to a kind of filter, especially relates to a kind of LC if bandpas filter of Out-of-band rejection superior performance.
[background technology]
In the impedance matching of filter, Q value is higher, and distance match point is far away, and the difficulty of impedance matching is larger, and BW=f0/Q, for narrow band filter, its centre frequency f0 is lower, and manufacture difficulty is less, and filter effect is better.Therefore at some to the exigent radio circuit occasion of Out-of-band rejection, carry out intermediate frequency filtering process after needing that intermediate frequency is moved to signal.In the design of repeater radio circuit especially in frequency selecting repeater, this characteristic is widely used equally.LC band pass filter common at present only has and increases Out-of-band rejection by increasing the method for progression, makes its circuit structure complicated and insertion loss is excessive, cannot meet the demand of product to performance of filter.
[summary of the invention]
The utility model is intended to solve the problem and provides a kind of LC if bandpas filter of Out-of-band rejection superior performance.
For achieving the above object, a kind of LC if bandpas filter of the present utility model comprises: a signal input port RFin; A signal output port RFout; A grounding ports GND; Also comprise the first rank series LC resonant circuit, second-order parallel LC resonance circuit, the 3rd rank series LC resonant circuit, quadravalence parallel LC resonance circuit, the 5th rank series LC resonant circuit; The first described rank series LC resonant circuit, the 3rd rank series LC resonant circuit, the 5th rank series LC resonant circuit are connected sequentially, the input connection signal input port RFin of the first rank series LC resonant circuit, the output connection signal output port RFout of the 5th rank series LC resonant circuit; The input of described second-order parallel LC resonance circuit connects the output of the first rank series LC resonant circuit, and the output of second-order parallel LC resonance circuit connects grounding ports GND; The input of described quadravalence parallel LC resonance circuit connects the output of the 3rd rank series LC resonant circuit, and the output of quadravalence parallel LC resonance circuit connects grounding ports GND; 5th rank series LC resonant circuit is also connected with feedback capacity C6 and shunt inductance L6, wherein, the input of feedback capacity C6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of feedback capacity C6, the input of shunt inductance L6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of shunt inductance L6.After signal enters from RFin port, export from RFout port after above-mentioned five rank resonant circuit filtering altogether, wherein the 5th rank series LC resonant circuit is connected with feedback capacity C6 and shunt inductance L6, thus introduce two transmission zeros, effectively improve the cut-off frequency characteristic of filter, obtain good Out-of-band rejection effect by comparatively simple structure.
Further, the connected mode of the utility model is perfect first rank series LC resonant circuit, comprises the first inductance L 1 and the first electric capacity C1 of series connection, wherein, signal input port RFin connects the first inductance L 1 input, and the output of the first inductance L 1 connects the first electric capacity C1 input;
Further, the connected mode of the utility model is perfect second-order parallel LC resonance circuit, comprise the second inductance L 2 and the second electric capacity C2 in parallel, wherein, second inductance L 2 is connected the output of the first electric capacity C1 with the input of the second electric capacity C2, and the second inductance L 2 is connected grounding ports GND with the output of the second electric capacity C2;
Further, the connected mode of the utility model is perfect 3rd rank series LC resonant circuit, comprises the 3rd inductance L 3 and the 3rd electric capacity C3 of series connection, wherein, 3rd inductance L 3 input connects the output of the first electric capacity C1, and the input of the 3rd electric capacity C3 connects the output of the 3rd inductance L 3;
Further, the connected mode of quadravalence parallel LC resonance circuit that the utility model is perfect, comprise the 4th inductance L 4 in parallel and the 4th electric capacity C4, wherein, 4th inductance L 4 is connected the output of the 3rd electric capacity C3 with the input of the 4th electric capacity C4, and the 4th inductance L 4 is connected grounding ports GND with the output of the 4th electric capacity C4;
Further, the connected mode of the utility model is perfect 5th rank series LC resonant circuit, comprise the 5th inductance L 5 and the 5th electric capacity C5 of series connection, wherein, the input of the 5th inductance L 5 connects the output of the 3rd electric capacity C3, the input of the 5th electric capacity C5 connects the output of the 5th inductance L 5, the output termination signal output port RFout of the 5th electric capacity C5;
Contribution of the present utility model is, provide a kind of structure simple, volume is little, and frequency-selecting performance is good, in-band insertion loss is little, and Out-of-band rejection is strong, low cost of manufacture, is suitable for batch production, can be widely used in the LC if bandpas filter of the occasion needing intermediate frequency filtering.
[accompanying drawing explanation]
Fig. 1 is schematic equivalent circuit of the present utility model.
[embodiment]
The following example is to further explanation of the present utility model and supplements, and does not constitute any limitation the utility model.
Embodiment 1
As shown in Figure 1, a kind of LC if bandpas filter of the present embodiment comprises: a signal input port RFin; A signal output port RFout; A grounding ports GND; Also comprise the first rank series LC resonant circuit 10, second-order parallel LC resonance circuit the 20, three rank series LC resonant circuit 30, quadravalence parallel LC resonance circuit 40, the 5th rank series LC resonant circuit 50; The first described rank series LC resonant circuit 10, the 3rd rank series LC resonant circuit 30, the 5th rank series LC resonant circuit 50 are connected sequentially, the input connection signal input port RFin of the first rank series LC resonant circuit 10, the output connection signal output port RFout of the 5th rank series LC resonant circuit 50; The input of described second-order parallel LC resonance circuit 20 connects the output of the first rank series LC resonant circuit 10, and the output of second-order parallel LC resonance circuit 20 connects grounding ports GND; The input of described quadravalence parallel LC resonance circuit 40 connects the output of the 3rd rank series LC resonant circuit 30, and the output of quadravalence parallel LC resonance circuit 40 connects grounding ports GND; 5th rank series LC resonant circuit 50 is also connected with feedback capacity C6 and shunt inductance L6, wherein, the input of feedback capacity C6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of feedback capacity C6, the input of shunt inductance L6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of shunt inductance L6.First rank series LC resonant circuit 10, second-order parallel LC resonance circuit 20 form a resonant tank, first time filtering is done to signal, 3rd rank series LC resonant circuit 40, quadravalence parallel LC resonance circuit 40 forms another resonant tank, does second time filtering to signal.5th rank series LC resonant circuit 50 is connected with feedback capacity C6 and shunt inductance L6, thus introduces two transmission zeros, effectively improve the cut-off frequency characteristic of filter, obtain good Out-of-band rejection effect by comparatively simple structure.
Embodiment 2
As shown in Figure 1, the present embodiment is perfect circuit connecting mode on the basis of embodiment 1, first rank series LC resonant circuit 10, comprise the first inductance L 1 and the first electric capacity C1 of series connection, wherein, signal input port RFin connects the first inductance L 1 input, and the output of the first inductance L 1 connects the first electric capacity C1 input;
Second-order parallel LC resonance circuit 20, comprise the second inductance L 2 and the second electric capacity C2 in parallel, wherein, the second inductance L 2 is connected the output of the first electric capacity C1 with the input of the second electric capacity C2, and the second inductance L 2 is connected grounding ports GND with the output of the second electric capacity C2;
3rd rank series LC resonant circuit 30, comprises the 3rd inductance L 3 and the 3rd electric capacity C3 of series connection, and wherein, the 3rd inductance L 3 input connects the output of the first electric capacity C1, and the input of the 3rd electric capacity C3 connects the output of the 3rd inductance L 3;
Quadravalence parallel LC resonance circuit 40, comprise the 4th inductance L 4 in parallel and the 4th electric capacity C4, wherein, the 4th inductance L 4 is connected the output of the 3rd electric capacity C3 with the input of the 4th electric capacity C4, and the 4th inductance L 4 is connected grounding ports GND with the output of the 4th electric capacity C4;
5th rank series LC resonant circuit 50, comprise the 5th inductance L 5 and the 5th electric capacity C5 of series connection, wherein, the input of the 5th inductance L 5 connects the output of the 3rd electric capacity C3, the input of the 5th electric capacity C5 connects the output of the 5th inductance L 5, the output termination signal output port RFout of the 5th electric capacity C5;
First rank series LC resonant circuit 10, second-order parallel LC resonance circuit 20, the 3rd rank series LC resonant circuit 30, quadravalence parallel LC resonance circuit 40, the 5th rank series LC resonant circuit 50 are respectively to the frequency-selective filtering effect that signal plays, superposed by the effect of five frequency-selective filterings, the transmission zero that recycling feedback capacity inductance is introduced, the Out-of-band rejection performance of LC if bandpas filter is greatly optimized, meets the demand of product to LC if bandpas filter frequency-selecting effect.
Although disclosed the utility model by above embodiment; but protection range of the present utility model is not limited thereto; under the condition not departing from the utility model design, all will fall in right of the present utility model the distortion, replacement etc. that above each component does.
Claims (6)
1. a LC if bandpas filter, comprising:
A signal input port RFin;
A signal output port RFout;
A grounding ports GND;
Also comprise the first rank series LC resonant circuit, second-order parallel LC resonance circuit, the 3rd rank series LC resonant circuit, quadravalence parallel LC resonance circuit and the 5th rank series LC resonant circuit;
The first described rank series LC resonant circuit, the 3rd rank series LC resonant circuit, the 5th rank series LC resonant circuit are connected sequentially, the input connection signal input port RFin of the first rank series LC resonant circuit, the output connection signal output port RFout of the 5th rank series LC resonant circuit;
The input of described second-order parallel LC resonance circuit connects the output of the first rank series LC resonant circuit, and the output of second-order parallel LC resonance circuit connects grounding ports GND;
The input of described quadravalence parallel LC resonance circuit connects the output of the 3rd rank series LC resonant circuit, and the output of quadravalence parallel LC resonance circuit connects grounding ports GND;
It is characterized in that: the 5th rank series LC resonant circuit is parallel with feedback capacity C6 and shunt inductance L6, wherein, the input of feedback capacity C6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of feedback capacity C6, the input of shunt inductance L6 connects the output of the 3rd electric capacity C3, the output connection signal output port RFout of shunt inductance L6.
2. a kind of LC if bandpas filter as claimed in claim 1, it is characterized in that: the first rank series LC resonant circuit, comprise the first inductance L 1 and the first electric capacity C1 of series connection, wherein, signal input port RFin connects the first inductance L 1 input, and the output of the first inductance L 1 connects the first electric capacity C1 input;
3. a kind of LC if bandpas filter as claimed in claim 2, it is characterized in that: second-order parallel LC resonance circuit, comprise the second inductance L 2 and the second electric capacity C2 in parallel, wherein, second inductance L 2 is connected the output of the first electric capacity C1 with the input of the second electric capacity C2, and the second inductance L 2 is connected grounding ports GND with the output of the second electric capacity C2;
4. a kind of LC if bandpas filter as claimed in claim 3, it is characterized in that: the 3rd rank series LC resonant circuit, comprise the 3rd inductance L 3 and the 3rd electric capacity C3 of series connection, wherein, 3rd inductance L 3 input connects the output of the first electric capacity C1, and the input of the 3rd electric capacity C3 connects the output of the 3rd inductance L 3;
5. a kind of LC if bandpas filter as claimed in claim 4, it is characterized in that: quadravalence parallel LC resonance circuit, comprise the 4th inductance L 4 in parallel and the 4th electric capacity C4, wherein, 4th inductance L 4 is connected the output of the 3rd electric capacity C3 with the input of the 4th electric capacity C4, and the 4th inductance L 4 is connected grounding ports GND with the output of the 4th electric capacity C4;
6. a kind of LC if bandpas filter as claimed in claim 5, it is characterized in that: the 5th rank series LC resonant circuit, comprise the 5th inductance L 5 and the 5th electric capacity C5 of series connection, wherein, the input of the 5th inductance L 5 connects the output of the 3rd electric capacity C3, the input of the 5th electric capacity C5 connects the output of the 5th inductance L 5, the output termination signal output port RFout of the 5th electric capacity C5;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520517953.5U CN204697023U (en) | 2015-07-16 | 2015-07-16 | A kind of LC if bandpas filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520517953.5U CN204697023U (en) | 2015-07-16 | 2015-07-16 | A kind of LC if bandpas filter |
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| Publication Number | Publication Date |
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| CN204697023U true CN204697023U (en) | 2015-10-07 |
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| CN201520517953.5U Expired - Fee Related CN204697023U (en) | 2015-07-16 | 2015-07-16 | A kind of LC if bandpas filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425823A (en) * | 2017-07-20 | 2017-12-01 | 安徽矽芯微电子科技有限公司 | A kind of ultra wide band bandpass filter |
| CN108879905A (en) * | 2018-09-12 | 2018-11-23 | 张家港市泓溢电源科技有限公司 | A kind of automobile charging circuit |
| CN109286586A (en) * | 2018-09-26 | 2019-01-29 | 昆明理工大学 | A kind of attenuation equalizer and application |
| CN113098437A (en) * | 2021-04-02 | 2021-07-09 | 西安博瑞集信电子科技有限公司 | Adjustable wide band filter bank |
| CN114421912A (en) * | 2022-03-30 | 2022-04-29 | 北京全路通信信号研究设计院集团有限公司 | Seven-order band-pass filter circuit of transponder transmission module |
| CN114584095A (en) * | 2022-05-06 | 2022-06-03 | 青岛鼎信通讯股份有限公司 | Amplitude equalization filter circuit based on narrowband carrier frequency modulation |
-
2015
- 2015-07-16 CN CN201520517953.5U patent/CN204697023U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425823A (en) * | 2017-07-20 | 2017-12-01 | 安徽矽芯微电子科技有限公司 | A kind of ultra wide band bandpass filter |
| CN108879905A (en) * | 2018-09-12 | 2018-11-23 | 张家港市泓溢电源科技有限公司 | A kind of automobile charging circuit |
| CN109286586A (en) * | 2018-09-26 | 2019-01-29 | 昆明理工大学 | A kind of attenuation equalizer and application |
| CN113098437A (en) * | 2021-04-02 | 2021-07-09 | 西安博瑞集信电子科技有限公司 | Adjustable wide band filter bank |
| CN114421912A (en) * | 2022-03-30 | 2022-04-29 | 北京全路通信信号研究设计院集团有限公司 | Seven-order band-pass filter circuit of transponder transmission module |
| CN114421912B (en) * | 2022-03-30 | 2022-07-05 | 北京全路通信信号研究设计院集团有限公司 | Seven-order band-pass filter circuit of transponder transmission module |
| CN114584095A (en) * | 2022-05-06 | 2022-06-03 | 青岛鼎信通讯股份有限公司 | Amplitude equalization filter circuit based on narrowband carrier frequency modulation |
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| 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: 20151007 |