CN208424590U - A kind of microwave frequency demultiplier inhibition signal interference circuit that the input of two tunnels exports all the way - Google Patents
A kind of microwave frequency demultiplier inhibition signal interference circuit that the input of two tunnels exports all the way Download PDFInfo
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- CN208424590U CN208424590U CN201820888818.5U CN201820888818U CN208424590U CN 208424590 U CN208424590 U CN 208424590U CN 201820888818 U CN201820888818 U CN 201820888818U CN 208424590 U CN208424590 U CN 208424590U
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Abstract
The utility model relates to a kind of microwave frequency demultipliers that the input of two tunnels exports all the way to inhibit signal interference circuit, the technical issues of what is solved is signal quality and bad stability, by using microwave frequency demultiplier two tunnels input in all the way be satellite TV signal branch, another way be cable TV signal branch；Cable TV signal branch includes compound low-pass filter circuit；Satellite TV signal branch includes the technical solution of LC high-pass filter, preferably resolves the problem, be can be used in TV tech application.
Description
Technical field
The utility model relates to TV technologies, and in particular to a kind of microwave frequency demultiplier suppression that the input of two tunnels exports all the way
Signal interference circuit processed.
Background technique
The low noise frequency demultiplier of microwave (abbreviation LNB -- Low Noise Block), usually 2 tunnels input 1 tunnel and export microwave
Downconverter power suppl end need to configure 1 pressure stabilizing triode (referred to as: regulator block), then by being available to product member after regulator block pressure stabilizing
The operating voltage to work needed for part.2 current tunnels input 1 tunnel and export frequency demultiplier, and the output port of complete product needs to match 2 kinds
The impedance line of different frequency, 2 road different frequency signals can be generated from same port output and be interfered with each other,
Therefore, existing technology there is technical issues that signal quality and, therefore it provides a kind of customer service is existing
The microwave frequency demultiplier for having the two tunnels input of technical problem to export all the way inhibits signal interference circuit with regard to necessary.
Utility model content
Technical problem to be solved in the utility model is that the skill of signal quality and bad stability exists in the prior art
Art problem.A kind of microwave frequency demultiplier inhibition signal interference circuit that the input of bis- tunnel Xin exports all the way, two tunnel input one are provided
The microwave frequency demultiplier inhibition signal interference circuit of road output has the characteristics that interfere with each other few.
In order to solve the above technical problems, the technical solution adopted is as follows:
A kind of microwave frequency demultiplier inhibition signal interference circuit that the input of two tunnels exports all the way, two tunnels of the microwave frequency demultiplier
In input is satellite TV signal branch all the way, and another way is cable TV signal branch；Cable TV signal branch includes
Compound low-pass filter circuit；Satellite TV signal branch includes LC high-pass filter.
Satellite TV signal abbreviation Satellite TV, cable television abbreviation CATV.
In above scheme, for optimization, further, the compound low-pass filter circuit includes connecting with CATV I/pF interface
The inductance L15 connect, capacitor C65, capacitor NC, capacitor C71, capacitor C68, resistance R33, inductance L20, inductance L19 and capacitor C67；
It is parallel with inductance L14 at capacitor NC, inductance L13 is parallel at capacitor C71, is parallel with inductance L12 at capacitor C68, at resistance R33
It is parallel with inductance L11；Capacitor NC and capacitor C71 tie point are connected with capacitor C72 and connect to ground, capacitor C71 and capacitor C68 tie point
It is connected to capacitor C70, capacitor C70 other end ground connection, capacitor C68 and resistance R33 tie point are connected with capacitor C69, and capacitor C69 is another
End ground connection；
Further, the inductance L11 is 1.2nH, and inductance L12 is 3.9nH, and inductance L13 is 6.8nH, and inductance L14 is
5.6nH, inductance L15 are 5.6nH, and inductance L20 is 10nH, and inductance L19 is 1nH, and capacitor C65 is 0.01u, and capacitor C72 is
2.7pF, capacitor C71 are 2.7pF, and capacitor C70 is 2.7pF, and capacitor C68 is 3.9pF, and capacitor C69 is 2.7pF, and capacitor C67 is
1nH, resistance R33 are 0 Ω.
Further, the LC high-pass filter includes capacitor C58, and capacitor C58 first end is connected with inductance L9, inductance L9
The other end is connected with capacitor C64, capacitor C64 other end ground connection；Capacitor C58 second end is connected with inductance L10, and inductance L10 is another
End is connected with capacitor C63 to ground, capacitor C63 other end ground connection.
Further, the inductance L9 is 10nH, and inductance L10 is 8.2nH, and capacitor C64 is 3.9pF, and capacitor C63 is
4.7pF, capacitor C58 are 5.6pF.
Further, the satellite TV signal branch further includes product feed waveguide pipe, is connected with product feed waveguide
The radio frequency polarization signal pin connect, the vertical polarization connector of radio frequency polarization signal pin connect vertical polarization radio frequency branch
Road, horizontal polarization connector connect horizontal polarization radio frequency branch, vertical polarization radio frequency branch and horizontal polarization radio frequency branch according to
It is secondary to be connected with radio frequency signal amplifiers, bandpass filter, mixting circuit, spuious bandpass filtering band circuit, the amplification of the intermediate frequency first order
Device, LTCC filter；The output end of the LTCC filter of vertical polarization radio frequency branch is connected with the first input of micro-strip combiner
End, the output end of the LTCC filter of horizontal polarization radio frequency branch are connected to the second input terminal of micro-strip combiner；Micro-strip combining
The output end of device is connected with final amplifier, and the output end of final amplifier is connected with DVB satellite reception end.
The utility model has the beneficial effects that the utility model is provided in CATV signal input part by load two by design
Hold shunt capacitor C, load in series inductor L, the compound low-pass filter circuit of composition.In Satellite TV signal input part
The circuit of high pass filter being made of LC is provided, is filtered out respectively by the circuit of 2 road different frequency filters other than oneself not
The frequency signal wanted, which reaches, solves the problems, such as that 2 road different frequency signals are interfered with each other from what logical Single port exported.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1, the microwave frequency demultiplier that the two tunnels input of embodiment 1 exports all the way inhibit signal interference circuit schematic diagram.
Fig. 2, the Satellite TV branch vertical polarization radio frequency subcircuits schematic diagram of embodiment 1.
Fig. 3, Satellite TV branch horizontal polarization radio frequency subcircuits schematic diagram in embodiment 1.
Fig. 4, radio frequency amplifier control circuit schematic diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, with reference to embodiments, to this
Utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain that this is practical new
Type is not used to limit the utility model.
Embodiment 1
The present embodiment provides a kind of microwave frequency demultipliers that the input of two tunnels exports all the way to inhibit signal interference circuit, such as Fig. 1 and
Fig. 2, the microwave frequency demultiplier two tunnels input in all the way be satellite TV signal branch, another way be cable TV signal branch
Road；Cable TV signal branch includes compound low-pass filter circuit；Satellite TV signal branch includes LC high-pass filter.
In the present embodiment, satellite TV signal abbreviation Satellite TV, cable television abbreviation CATV.
Such as Fig. 1, the compound low-pass filter circuit includes the inductance L15 connecting with CATV I/pF interface, capacitor C65, electricity
Hold NC, capacitor C71, capacitor C68, resistance R33, inductance L20, inductance L19 and capacitor C67；Inductance L14 is parallel at capacitor NC,
It is parallel with inductance L13 at capacitor C71, inductance L12 is parallel at capacitor C68, inductance L11 is parallel at resistance R33；Capacitor NC with
Capacitor C71 tie point is connected with capacitor C72 and is connected with capacitor C70 to ground, capacitor C71 and capacitor C68 tie point, and capacitor C70 is another
One end ground connection, capacitor C68 and resistance R33 tie point are connected with capacitor C69, capacitor C69 other end ground connection；
If Fig. 1, the inductance L11 are 1.2nH, inductance L12 is 3.9nH, and inductance L13 is 6.8nH, and inductance L14 is
5.6nH, inductance L15 are 5.6nH, and inductance L20 is 10nH, and inductance L19 is 1nH, and capacitor C65 is 0.01u, and capacitor C72 is
2.7pF, capacitor C71 are 2.7pF, and capacitor C70 is 2.7pF, and capacitor C68 is 3.9pF, and capacitor C69 is 2.7pF, and capacitor C67 is
1nH, resistance R33 are 0 Ω.
The compound small actual effect of low-pass filter circuit Insertion Loss can reach < 1.5dB, and isolation effect is good, other than frequency
950-2150 isolation can reach 35dB.After filtering processing, the incoming end that useful signal is sent to DVB signal is so far real
Existing two paths of signals anti-interference ability.
Such as Fig. 1, the LC high-pass filter includes capacitor C58, and capacitor C58 first end is connected with inductance L9, and inductance L9 is another
One end is connected with capacitor C64, capacitor C64 other end ground connection；Capacitor C58 second end is connected with inductance L10, the inductance L10 other end
Capacitor C63 is connected with to ground, capacitor C63 other end ground connection.
If Fig. 1, the inductance L9 are 10nH, inductance L10 is 8.2nH, and capacitor C64 is 3.9pF, and capacitor C63 is 4.7pF,
Capacitor C58 is 5.6pF.
CATV 174 ~ 700MHZ of signal frequency point is mainly carried out decaying inhibition by LC high-pass filter.To reach solution two
Road different frequency signals interfere with each other.
The satellite TV signal branch further includes product feed waveguide pipe, the radio frequency two connecting with product feed waveguide
The vertical polarization connector of pole differentiation signal needle, radio frequency polarization signal pin connects vertical polarization radio frequency branch, horizontal polarization
Connector connects horizontal polarization radio frequency branch, and vertical polarization radio frequency branch and horizontal polarization radio frequency branch are connected with radio frequency in turn
Signal amplifier, bandpass filter, mixting circuit, spuious bandpass filtering band circuit, intermediate frequency first order amplifier, LTCC filtering
Device；The output end of the LTCC filter of vertical polarization radio frequency branch is connected with the first input end of micro-strip combiner, horizontal polarization
The output end of the LTCC filter of radio frequency branch is connected to the second input terminal of micro-strip combiner；The output end of micro-strip combiner connects
It is connected to final amplifier, the output end of final amplifier is connected with DVB satellite reception end.If Fig. 2 is vertical polarization radio frequency branch
Circuit diagram, DR2 10.55GHz, if Fig. 3 be horizontal polarization radio frequency branch circuit diagram, wherein DR1 be 11.25GHz.
The circuit diagram of horizontal polarization radio frequency branch is similar with vertical polarization radio frequency branch.Horizontal polarization radio frequency branch and vertical polarization are penetrated
Radio frequency signal amplifiers in frequency branch pass through the Integrated circuit IC of Fig. 4 such as and connect and control with peripheral circuit, which is existing
Have, details are not described herein again.
In the present embodiment, space radiofrequency signal is filtered amplified signal and is connect by the radio frequency signal pin that produces a polarization by product feed
Radio frequency signal amplifiers are received and are sent to, through the radio frequency signal amplifiers first order, then by penetrating after the second level, third level enhanced processing
Frequency polarization signal enters bandpass filter processing, by frequency signal Vertical after being handled by bandpass filter
Target signal filter a part other than 12.06GHZ -12.7GHZ, Horizontal 12.2GHZ -12.68GHZ.
Bandpass filter by Vertical 12.06GHZ -12.7GHZ, Horizontal 12.2GHZ -12.68GHZ with
External signal realizes that DVB receives effective frequency range and achievees the purpose that be easier demodulation program after filtering out a part, by local oscillator resonance electricity
It is respectively that Vertical local oscillator 10.55GHZ, Horizontal local oscillator 11.25GHZ and band logical are filtered that road, which generates each segment signal source frequency,
Radiofrequency signal after wave is input to mixting circuit, accordingly subtracts each other 2 road signals after mixting circuit and obtains intermediate-freuqncy signal wave band
This signal of Vertical 950MHz ~ 1430MHz, Horizontal 1510MHz ~ 2150MHz. is charged by spuious bandpass filtering
After the processing of road and input intermediate-freuqncy signal is passed to intermediate frequency first order amplifier to amplify signal, then transmits and is input to LTCC filter
Signal filtering processing is carried out, then by a microstrip power divider circuit by Vertical 950MHz ~ 1430MHz, Horizontal
The signal of two groups of different frequencies of 1510MHz ~ 2150MHz., which is combined, to be resent to final amplifier and amplifies signal simultaneously again
Output completes entire satellite-signal transmission and receives processing function to DVB satellite reception end.
The frequency signal of another way CATV signal end input is that 174 ~ 700MHz passes through one by loading both ends shunt capacitance
Unwanted frequency target signal filter is fallen a part by the compound low-pass filter circuit of device C, load in series inductor L, composition.Then
Useful CATV signal is sent to DVB satellite reception end again.Microwave frequency demultiplier is exported to realize that 2 tunnels input 1 tunnel.
Resistance in the present embodiment, capacitor, inductance value may include certain error value, and error amount is subject to professional standard.
Although the illustrative specific embodiment of the utility model is described above, in order to the art
Technical staff is it will be appreciated that the utility model, but the utility model is not limited only to the range of specific embodiment, to this technology
For the those of ordinary skill in field, as long as long as the utility model that various change is limited and determined in the attached claims
In spirit and scope, all are created using the utility model of the utility model design in the column of protection.
Claims (4)
1. a kind of microwave frequency demultiplier that the input of two tunnels exports all the way inhibits signal interference circuit, it is characterised in that: the microwave drop
In the input of bis- tunnel frequency Qi is satellite TV signal branch all the way, and another way is cable TV signal branch；
Cable TV signal branch includes compound low-pass filter circuit；
Satellite TV signal branch includes LC high-pass filter；
The compound low-pass filter circuit includes the inductance L15 connecting with CATV I/pF interface, capacitor C65, capacitor NC, capacitor
C71, capacitor C68, resistance R33, inductance L20, inductance L19 and capacitor C67；Inductance L14 is parallel at capacitor NC, at capacitor C71
It is parallel with inductance L13, inductance L12 is parallel at capacitor C68, inductance L11 is parallel at resistance R33；Capacitor NC and capacitor C71 connects
Contact is connected with capacitor C72 and is connected with capacitor C70 to ground, capacitor C71 and capacitor C68 tie point, and the capacitor C70 other end is grounded,
Capacitor C68 and resistance R33 tie point are connected with capacitor C69, capacitor C69 other end ground connection；
The LC high-pass filter includes capacitor C58, and capacitor C58 first end is connected with inductance L9, and the inductance L9 other end is connected with
Capacitor C64, capacitor C64 other end ground connection；Capacitor C58 second end is connected with inductance L10, and the inductance L10 other end is connected with capacitor
C63, capacitor C63 other end ground connection.
2. the microwave frequency demultiplier that two tunnels input according to claim 1 exports all the way inhibits signal interference circuit, feature
Be: the inductance L11 is 1.2nH, and inductance L12 is 3.9nH, and inductance L13 is 6.8nH, and inductance L14 is 5.6nH, inductance
L15 is 5.6nH, and inductance L20 is 10nH, and inductance L19 is 1nH, and capacitor C65 is 0.01uF, and capacitor C72 is 2.7pF, capacitor
C71 is 2.7pF, and capacitor C70 is 2.7pF, and capacitor C68 is 3.9pF, and capacitor C69 is 2.7pF, and capacitor C67 is 1nH, resistance R33
For 0 Ω.
3. the microwave frequency demultiplier that two tunnels input according to claim 2 exports all the way inhibits signal interference circuit, feature
Be: the inductance L9 is 10nH, and inductance L10 is 8.2nH, and capacitor C64 is 3.9pF, and capacitor C63 is 4.7pF, and capacitor C58 is
5.6pF。
4. the microwave frequency demultiplier that two tunnels input according to claim 1 exports all the way inhibits signal interference circuit, feature
Be: the satellite TV signal branch further includes product feed waveguide pipe, the radio frequency the two poles of the earth connecting with product feed waveguide
The vertical polarization connector of differentiation signal needle, radio frequency polarization signal pin connects vertical polarization radio frequency branch, and horizontal polarization connects
Interface connects horizontal polarization radio frequency branch, and vertical polarization radio frequency branch and horizontal polarization radio frequency branch are connected with radio frequency letter in turn
Number amplifier, bandpass filter, mixting circuit, spuious bandpass filtering band circuit, intermediate frequency first order amplifier, LTCC filter；
The output end of the LTCC filter of vertical polarization radio frequency branch is connected with the first input end of micro-strip combiner, horizontal polarization radio frequency
The output end of the LTCC filter of branch is connected to the second input terminal of micro-strip combiner；The output end of micro-strip combiner is connected with
Final amplifier, the output end of final amplifier are connected with DVB satellite reception end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820888818.5U CN208424590U (en) | 2018-06-08 | 2018-06-08 | A kind of microwave frequency demultiplier inhibition signal interference circuit that the input of two tunnels exports all the way |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820888818.5U CN208424590U (en) | 2018-06-08 | 2018-06-08 | A kind of microwave frequency demultiplier inhibition signal interference circuit that the input of two tunnels exports all the way |
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| CN208424590U true CN208424590U (en) | 2019-01-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133691A (en) * | 2019-04-29 | 2019-08-16 | 上海艾为电子技术股份有限公司 | A kind of high-performance trap circuit |
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2018
- 2018-06-08 CN CN201820888818.5U patent/CN208424590U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133691A (en) * | 2019-04-29 | 2019-08-16 | 上海艾为电子技术股份有限公司 | A kind of high-performance trap circuit |
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