CN208158553U - A kind of combined filter circuit for frequency selection radiofrequency signal - Google Patents
A kind of combined filter circuit for frequency selection radiofrequency signal Download PDFInfo
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- CN208158553U CN208158553U CN201821431558.5U CN201821431558U CN208158553U CN 208158553 U CN208158553 U CN 208158553U CN 201821431558 U CN201821431558 U CN 201821431558U CN 208158553 U CN208158553 U CN 208158553U
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Abstract
The utility model provides a kind of combined filter circuit for frequency selection radiofrequency signal, respectively all the way high frequency, the two-way local oscillation signal of low frequency is input to coupler through switch all the way, the main signal output of coupler is successively exported through amplifier, isolator, numerical-control attenuator and final amplifier；The coupled end output of coupler is mixed with medium-and-high freuqncy signal through amplifier, isolator input mixer and generates radiofrequency signal, and frequency mixer output exports after switch filtering group, amplifier, isolator, numerical-control attenuator, switch filtering group and amplifier.The utility model can effectively inhibit the spuious of radio frequency band and out-of-band, and add the switch filter group of multichannel to radio frequency power output without influence.
Description
Technical field
The present invention relates to a kind of combined filter circuits.
Background technique
The output of certain radar synthetizer radio frequency there are spuious in X-band and radio frequency operation frequency band, maximum power is-
80dBm.After two-stage amplifies (each 30dB of gain), there is the power of -20dBm in RF output end.Radio frequency relative to 20dBm is defeated
Power out, there is that -40dBc's is spuious, and spuious then in -30dBc or so after amplifier chain exports.
In the prior art, the local oscillator high band signal different with low-frequency range two-way first passes through a switch and is input to one
Coupler, a-road-through are crossed amplifier, isolator and numerical control attenuation and are exported as one local oscillator of synthetizer, and another way is put by one
Big device, isolator are mixed with high intermediate frequency, and the signal for being mixed out passes through the switch filtering group on 2 tunnels, then by amplifying,
Isolation, and pass through numerical control attenuation, then amplify, the RF excited as synthetizer exports.
Since dual-stage amplifier is broad band amplifier, X-band is contained, so to the power very little of the X-band outside band
Signal be also exaggerated, reach very big power.
The filter of selection is only simply simple to radio frequency low side and high-end spuious carry out one to be filtered, and right
Spuious near radio frequency operation frequency point fails effectively to filter, so that two-stage broad band amplifier is saturated after the spuious warp in band
It is spuious after amplification to obtain a degree of deterioration.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of combined filter electricity for frequency selection radiofrequency signal
Road, can will inside and outside band spurious reduction to be less than -60dBc, for synthetizer (since amplifier chain is to spuious deterioration
It 10dB) can be by spurious reduction to less than -70dBc.
The technical solution adopted by the present invention to solve the technical problems is：A kind of combined filter of frequency selection radiofrequency signal
Circuit, including coupler, amplifier, isolator, numerical-control attenuator, frequency mixer, switch, filter and switch filtering group.
Respectively all the way high frequency, the two-way local oscillation signal of low frequency is input to coupler, the main letter of coupler through switch 1 all the way
Number output successively through amplifier 1, isolator 1, numerical-control attenuator and final amplifier 2 export；The coupled end of coupler exports warp
Amplifier 3,2 input mixer of isolator are mixed with medium-and-high freuqncy signal and generate radiofrequency signal, and switch filtering is passed through in frequency mixer output
It is exported after group 1, amplifier 4, isolator 3, numerical-control attenuator 2, switch filtering group 2 and amplifier 5.
The switch filtering group 2 is the switch filtering group an of multichannel, wherein using medium cavity body filter to radio frequency
The spuious of frequency point proximal end is inhibited, and is inhibited using cavity body filter to the spuious of distal end.
The two-way local oscillation signal is input to coupler through the frequency selection of switch 1, and the main signal output of coupler exists
Power amplification isolation is realized in amplifier 1 and isolator 1, enlarged local oscillation signal realizes power management by numerical-control attenuator,
Local oscillation signal needed for forming system as the amplification of final amplifier 2 again；The coupled end output of coupler is in amplifier 3, isolation
Power amplification isolation is realized in device 2, radiofrequency signal needed for generation system is mixed with medium-and-high freuqncy signal is real through switch filtering group 1
The radiofrequency signal of existing spurious reduction is input to numerical-control attenuator 2 and realizes function after the effect of the Amplification and insulation of amplifier 4, isolator 3
Rate management, then secondary inhibition is carried out to band spurious by switch filtering group 2, the radiofrequency signal through spuious secondary inhibition is by amplifier
After 5 realize final final stage amplification, final radiofrequency signal output needed for formation system.
The beneficial effects of the invention are as follows：The switch filtering group of a multichannel is added on radio frequency path, wherein switch filtering
In group each filter to RF spot proximal end it is spuious and distal end it is spuious done effective inhibition, and switching
The design aspect of filter is designed in conjunction with by the way of using medium cavity body filter and cavity body filter in filtering group, dielectric cavity
Fluid filter mainly inhibits the spuious of RF spot proximal end, and cavity body filter is then mainly for the spuious progress of distal end
Inhibit.The mode combined in this way can effectively inhibit the spuious of radio frequency band and out-of-band, and in prior art designs
The two-stage amplification of radio frequency output is all in saturation output state, and saturation capacity is in 10dB, and the insertion of variable connector filter group
Loss is in 7dB or so, so the switch filter group of addition multichannel is on radio frequency power output without influence.
Detailed description of the invention
Fig. 1 is the principle of the present invention schematic diagram.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
The present invention provides a kind of combined filter circuit of frequency selection radiofrequency signal, is mainly used for certain modified radar frequency
The filtering of Ku band up-conversion module radiofrequency signal in synthesizer, can be improved the spuious level of synthetizer, be radar system
Each subsystem stable local oscillation signal and radiofrequency signal are provided.
As shown in Figure 1, a kind of combined filter circuit of frequency selection radiofrequency signal provided by the invention mainly includes coupling
Device, amplifier, isolator, numerical-control attenuator, frequency mixer, switch, filter, switch filtering group.
Two-way local oscillation signal (is all the way high frequency, is all the way low frequency) the frequency selection index system through switch 1, is input to coupling
Device, the main signal of coupler is exported realizes power amplification buffer action, enlarged local oscillation signal after amplifier 1, isolator 1
The management of power is realized by numerical-control attenuator, then local oscillation signal needed for forming system as the amplification of final amplifier 2；Coupler
Coupled end export through amplifier 3, isolator 2 Amplification and insulation effect, be mixed needed for generation system and penetrate with medium-and-high freuqncy signal
Frequency signal produces several band spurious at this time since the signal frequency hopping is covered with wide, need to be through switch 2, switch 3, filter
1, the switch filtering group 1 that filter 2 is constituted realizes spuious inhibition, and the radiofrequency signal of spurious reduction is realized through switch filtering group 1
After the effect of the Amplification and insulation of amplifier 4, isolator 3, it is input to the management that numerical-control attenuator 2 realizes power, then filtered by switch
The spuious secondary inhibition of carry out in 2 pairs of bands of wave group, the radiofrequency signal through spuious secondary inhibition are realized final end by amplifier 5
After grade amplification, final radiofrequency signal output needed for formation system.
Broadband filter is changed to filter group by the present invention, is placed on after numerical-control attenuator.Wherein in switch filtering group
The proximal end to RF spot of each filter it is spuious and distal end it is spuious done effective inhibition, and switching
The design aspect of filter is designed in conjunction with by the way of using medium cavity body filter and cavity body filter in filtering group, dielectric cavity
Fluid filter mainly inhibits the spuious of RF spot proximal end, and cavity body filter is then mainly for the spuious progress of distal end
Inhibit.Inhibition index spuious inside and outside band improves to less than -70dBc.
Claims (3)
1. a kind of combined filter circuit for frequency selection radiofrequency signal, including coupler, amplifier, isolator, numerical control decline
Subtract device, frequency mixer, switch, filter and switch filtering group, it is characterised in that：The respectively two-way of high frequency, low frequency all the way all the way
Local oscillation signal is input to coupler through switch 1, and the main signal of coupler exports successively through amplifier 1, isolator 1, numerical control attenuation
Device and final amplifier 2 export；The coupled end output of coupler is believed through amplifier 3,2 input mixer of isolator with high intermediate frequency
Number mixing generate radiofrequency signal, frequency mixer output by switch filtering group 1, amplifier 4, isolator 3, numerical-control attenuator 2, switch
It is exported after filtering group 2 and amplifier 5.
2. the combined filter circuit according to claim 1 for frequency selection radiofrequency signal, it is characterised in that：Described
Switch filtering group 2 is the switch filtering group an of multichannel, wherein using medium cavity body filter to the spuious of RF spot proximal end
Inhibited, the spuious of distal end is inhibited using cavity body filter.
3. the combined filter circuit according to claim 1 for frequency selection radiofrequency signal, it is characterised in that：Described
Two-way local oscillation signal is input to coupler through the frequency selection of switch 1, and the main signal of coupler is exported in amplifier 1 and isolator
Power amplification isolation is realized in 1, enlarged local oscillation signal realizes power management by numerical-control attenuator, then by final amplifier 2
Amplification form system needed for local oscillation signal；The coupled end of coupler is exported realizes that power is put in amplifier 3, isolator 2
Big isolation, radiofrequency signal needed for generation system is mixed with medium-and-high freuqncy signal realize the radio frequency of spurious reduction through switch filtering group 1
Signal is input to numerical-control attenuator 2 and realizes power management after the effect of the Amplification and insulation of amplifier 4, isolator 3, then by switching
2 pairs of band spurious of filtering group carry out secondary inhibition, and the radiofrequency signal through spuious secondary inhibition is realized final final stage by amplifier 5
After amplification, final radiofrequency signal output needed for formation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821431558.5U CN208158553U (en) | 2018-08-31 | 2018-08-31 | A kind of combined filter circuit for frequency selection radiofrequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821431558.5U CN208158553U (en) | 2018-08-31 | 2018-08-31 | A kind of combined filter circuit for frequency selection radiofrequency signal |
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| Publication Number | Publication Date |
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| CN208158553U true CN208158553U (en) | 2018-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821431558.5U Active CN208158553U (en) | 2018-08-31 | 2018-08-31 | A kind of combined filter circuit for frequency selection radiofrequency signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022180A (en) * | 2019-04-18 | 2019-07-16 | 中国电子科技集团公司第五十四研究所 | A kind of passive high-precision intermodulation testing method |
| CN112751577A (en) * | 2020-12-30 | 2021-05-04 | 中电科仪器仪表(安徽)有限公司 | Ultra-wideband millimeter wave up-conversion transmitting device and method |
-
2018
- 2018-08-31 CN CN201821431558.5U patent/CN208158553U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022180A (en) * | 2019-04-18 | 2019-07-16 | 中国电子科技集团公司第五十四研究所 | A kind of passive high-precision intermodulation testing method |
| CN112751577A (en) * | 2020-12-30 | 2021-05-04 | 中电科仪器仪表(安徽)有限公司 | Ultra-wideband millimeter wave up-conversion transmitting device and method |
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