CN204119181U - A kind of diplex filter circuit for the synthesis of two-way radiofrequency signal - Google Patents
A kind of diplex filter circuit for the synthesis of two-way radiofrequency signal Download PDFInfo
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- CN204119181U CN204119181U CN201420517264.XU CN201420517264U CN204119181U CN 204119181 U CN204119181 U CN 204119181U CN 201420517264 U CN201420517264 U CN 201420517264U CN 204119181 U CN204119181 U CN 204119181U
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Abstract
The utility model relates to a kind of diplex filter circuit for the synthesis of two-way radiofrequency signal.Circuit is provided with three signal connection ends, and inductance L 1, inductance L 2, inductance L 3, electric capacity C1, electric capacity C2 and electric capacity C3 constitute low frequency length of tape bandpass filter.Inductance L 5, inductance L 6, inductance L 7, electric capacity C5, electric capacity C6 and electric capacity C7 constitute high-frequency length of tape bandpass filter.The utility model is for the high-frequency circuit in shortwave and ultrashort wave frequency range, the radiofrequency signal of two-way different frequency scope can be synthesized a road to export, the power of any road radiofrequency signal is attenuated more than 40dB in the frequency range of another road radiofrequency signal, and the isolation between two-way radiofrequency signal is more than 60dB.Circuit is simple, reliable, realization is flexible, can be used for the conjunction road of two-way road signal in shortwave and ultrashort wave frequency range, or the signal isolation etc. of the transmitting-receiving path of transmitting-receiving alien frequencies system.
Description
Technical field
The utility model relates to radio-frequency filter, particularly a kind of diplex filter circuit for the synthesis of two-way radiofrequency signal.
Background technology
Under normal conditions, radio-frequency filter has two ports, and one is signal input, and another is signal output, and the impedance of two ports is all mated at 50 ohm.When the band pass filter of two different frequencies is connected in parallel by needs, when forming a kind of duplexer filter for the synthesis of two-way radiofrequency signal, the common port of two parallel filters can not be connected directly between together, otherwise comm port is in impedance mismatch state, the characteristic of two band pass filters can be affected, two band pass filters are by linking together after suitable impedance matching, to ensure that all of the port of duplexer is all in matching status, thus ensure that the band pass filter of different frequency normally works.
Summary of the invention
In view of prior art Problems existing and defect, the basic design scheme that the utility model uses discrete component to make duplexer filter provides a kind of diplex filter circuit for the synthesis of two-way radiofrequency signal, be mainly used in shortwave and ultrashort wave frequency range, the signal that first signal connection end RF1 incoming frequency is lower, the signal that secondary signal link RF2 incoming frequency is higher, the signal closed behind road exports from the 3rd signal connection end RF3, the frequency bandwidth of each road signal of duplexer filter is variable, can be adjusted by the value of discrete component.
Taked for achieving the above object technical scheme of the utility model is: a kind of diplex filter circuit for the synthesis of two-way radiofrequency signal, it is characterized in that: this diplex filter circuit is provided with three signal connection ends, be respectively the first signal connection end RF1, secondary signal link RF2 and the 3rd signal connection end RF3; First signal connection end RF1 connects one end of one end of inductance L 1, one end of electric capacity C1 and inductance L 2; The other end of inductance L 1 is connected rear ground connection with the other end of electric capacity C1; The other end of inductance L 2 connects one end of electric capacity C2; One end of the other end of electric capacity C2 and one end of inductance L 3, one end of electric capacity C3, one end of inductance L 4 and electric capacity C4 links together; The other end of inductance L 3 is connected rear ground connection with the other end of electric capacity C3; Secondary signal link RF2 connects one end of one end of inductance L 5, one end of electric capacity C5 and inductance L 6; The other end of inductance L 5 is connected rear ground connection with the other end of electric capacity C5; The other end of inductance L 6 connects one end of electric capacity C6; 1 pin of the other end of electric capacity C6 and one end of inductance L 7, one end of electric capacity C7, one end of inductance L 8 and electric capacity C8 links together; The other end of inductance L 7 is connected rear ground connection with the other end of electric capacity C7; The other end of electric capacity C4 and the other end of inductance L 4, the other end of electric capacity C8 and the other end of inductance L 8 link together, and are connected to the 3rd signal connection end RF3.
The beneficial effects of the utility model are: for the high-frequency circuit in shortwave and ultrashort wave frequency range, the radiofrequency signal of two-way different frequency scope can be synthesized a road to export, the power of any road radiofrequency signal is attenuated more than 40dB in the frequency range of another road radiofrequency signal, and the isolation between two-way radiofrequency signal is more than 60dB.Circuit is simple, reliable, realization is flexible, can be used for the conjunction road of two-way road signal in shortwave and ultrashort wave frequency range, or the signal isolation etc. of the transmitting-receiving path of transmitting-receiving alien frequencies system.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams;
Fig. 2 is the utility model frequency response simulation curve figure.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
With reference to Fig. 1, inductance L 1, inductance L 2, inductance L 3, electric capacity C1, electric capacity C2 and electric capacity C3 constitute low frequency length of tape bandpass filter.Inductance L 5, inductance L 6, inductance L 7, electric capacity C5, electric capacity C6 and electric capacity C7 constitute high-frequency length of tape bandpass filter.The effect of inductance L 4, electric capacity C4, inductance L 8 and electric capacity C8 is port Impedance coupling.During work, the signal of lower frequency inputs from the first signal connection end RF1, after the circuit of the first half, exports from the 3rd signal connection end RF3.The signal of upper frequency inputs from secondary signal link RF2, after the circuit of the latter half, exports from the 3rd signal connection end RF3.
With reference to the frequency response simulation curve that Fig. 2, Fig. 2 are this circuit, the curve marking m1 instruction in figure is the frequency response of low frequency section filter, and the position at mark m1 place is the center frequency points of low frequency section passband; The curve of mark m2 instruction is the frequency response of high-frequency section filter, and the position at mark m2 place is the center frequency points of high-frequency section passband.
Claims (1)
1., for a diplex filter circuit for two-way radiofrequency signal synthesis, it is characterized in that: this diplex filter circuit is provided with three signal connection ends, be respectively the first signal connection end RF1, secondary signal link RF2 and the 3rd signal connection end RF3; First signal connection end RF1 connects one end of one end of inductance L 1, one end of electric capacity C1 and inductance L 2; The other end of inductance L 1 is connected rear ground connection with the other end of electric capacity C1; The other end of inductance L 2 connects one end of electric capacity C2; One end of the other end of electric capacity C2 and one end of inductance L 3, one end of electric capacity C3, one end of inductance L 4 and electric capacity C4 links together; The other end of inductance L 3 is connected rear ground connection with the other end of electric capacity C3; Secondary signal link RF2 connects one end of one end of inductance L 5, one end of electric capacity C5 and inductance L 6; The other end of inductance L 5 is connected rear ground connection with the other end of electric capacity C5; The other end of inductance L 6 connects one end of electric capacity C6; 1 pin of the other end of electric capacity C6 and one end of inductance L 7, one end of electric capacity C7, one end of inductance L 8 and electric capacity C8 links together; The other end of inductance L 7 is connected rear ground connection with the other end of electric capacity C7; The other end of electric capacity C4 and the other end of inductance L 4, the other end of electric capacity C8 and the other end of inductance L 8 link together, and are connected to the 3rd signal connection end RF3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420517264.XU CN204119181U (en) | 2014-09-10 | 2014-09-10 | A kind of diplex filter circuit for the synthesis of two-way radiofrequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420517264.XU CN204119181U (en) | 2014-09-10 | 2014-09-10 | A kind of diplex filter circuit for the synthesis of two-way radiofrequency signal |
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| CN204119181U true CN204119181U (en) | 2015-01-21 |
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| CN201420517264.XU Active CN204119181U (en) | 2014-09-10 | 2014-09-10 | A kind of diplex filter circuit for the synthesis of two-way radiofrequency signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703787A (en) * | 2016-01-07 | 2016-06-22 | 广东圣大电子有限公司 | Large-power rapid change-over switch filter assembly |
| CN106921358A (en) * | 2015-12-28 | 2017-07-04 | 鸿富锦精密工业（深圳）有限公司 | Power distribution combiner circuit with filter function |
| TWI738428B (en) * | 2019-08-10 | 2021-09-01 | 日商村田製作所股份有限公司 | Diplexer |
-
2014
- 2014-09-10 CN CN201420517264.XU patent/CN204119181U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106921358A (en) * | 2015-12-28 | 2017-07-04 | 鸿富锦精密工业（深圳）有限公司 | Power distribution combiner circuit with filter function |
| CN105703787A (en) * | 2016-01-07 | 2016-06-22 | 广东圣大电子有限公司 | Large-power rapid change-over switch filter assembly |
| CN105703787B (en) * | 2016-01-07 | 2018-10-16 | 广东圣大电子有限公司 | A kind of high-power quick converting switch filter assembly |
| TWI738428B (en) * | 2019-08-10 | 2021-09-01 | 日商村田製作所股份有限公司 | Diplexer |
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