CN103954956A - Self-adaptation four-port cancellation network structure and self-adaptation cancellation method - Google Patents
Self-adaptation four-port cancellation network structure and self-adaptation cancellation method Download PDFInfo
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- CN103954956A CN103954956A CN201410216061.1A CN201410216061A CN103954956A CN 103954956 A CN103954956 A CN 103954956A CN 201410216061 A CN201410216061 A CN 201410216061A CN 103954956 A CN103954956 A CN 103954956A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
Abstract
The invention discloses a self-adaptation four-port cancellation network structure and a self-adaptation cancellation method. The structure comprises an amplitude-phase cancellation network and a self-adaptation adjusting structure, wherein the amplitude-phase cancellation network comprises a coupler, an adjustable gain amplifier, an analog phase shifter, a power amplifier, a matched load and a attenuator, the aim that the transmitting chain is coupled with part of energy is achieved, amplitude phase adjustment is performed on a coupling signal, then, the amplitude of a received link coupler and the amplitude of a received same-frequency interference signal are approximately equal, the phase of the received link coupler and the phase of the received same-frequency interference signal are approximately opposite, finally, the amplitude of the received same-frequency interference signal is restrained to be on a lower level, and therefore the received channel carrier-to-noise ratio is improved. The self-adaptation adjusting structure comprises a coupler, a detector, a comparator matched load and a gain adjustable amplifier, the amplitude of the received same-frequency interference signal set on a parallel comparator public reference end is restrained to be the target level detection voltage, and a loop self-adaptation adjusting structure can automatically adjust the adjustable gain amplifier and the analog phase shifter in the amplitude phase cancellation network.
Description
Technical field
The present invention relates to one and offset topology of networks, and be specifically related to a kind ofly comprise that amplitude-phase offsets network, self-adaptation and adjusts self-adaptation four ports of structure and offset network, belong to microwave designing field.
Background technology
Micrometric displacement transceiver channel be with frequently, simultaneously, with the working system of antenna, can be leaked in receive channel by circulator so transmit, cause receiving cable saturated, worsen the signal to noise ratio (S/N ratio) of receive channel to useful signal, affect last the measuring precision; Or make the measuring distance of whole system very little, cannot practical engineering application.For the signal being leaked in receive channel by circulator that transmits being suppressed in receive channel, the method adopting is by coupling mechanism certain signal energy that is coupled at transmitting channel end, and coupled signal is adjusted to its amplitude and phase place through adjustable attenuator and phase shifter, make that coupled signal equates with the amplitude of leakage signal, 180 ° of phase phasic differences, thereby reach, the inhibition of circulator leakage signal is offset.Traditional superelevation isolation annular device receives emission port isolation stable state 75dB, and isolation is lower, and the occasion of having relatively high expectations at some measuring distances is subject to very large restriction, has affected the measuring distance of system.So in the field of space flight tellurometer survey at present, urgent need research is a kind of can make the reception of isolation annular device reach higher network structure to emission port isolation.
Summary of the invention
To the effect that of the present invention: to overcome the deficiencies in the prior art, propose a kind of self-adaptation four ports and offseted network structure, be coupled certain signal to offseting branch road by the coupling mechanism of transmitting chain, this signal reaches amplitude by coupling mechanism with transmitting of receiver leakage and equates after parallel adaptive amplitude, phase place adjustment, 180 ° of phase phasic differences realize signal cancellation, receive the requirement to transmitting high-isolation thereby realize micro-displacement measuring system.
Technical solution of the present invention is:
A kind of self-adaptation four ports offset network structure and comprise: amplitude-phase offsets network, self-adaptation is adjusted structure, described amplitude-phase offsets network and comprises again coupling mechanism Z1, Z8, variable gain amplifier Z3, analog phase shifter Z5, power amplifier Z7, matched load Z14, Z15, Z16, attenuator Z2, Z4, Z6; Described self-adaptation is adjusted structure and is comprised again coupling mechanism Z9, comparer Z12, Z13, wave detector Z11, variable gain amplifier Z10, matched load Z16;
Transmit and export from port one input, port 2, the reception signal that contains compromising emanation signal from port 3 input, port 4 exports;
The coupling mechanism Z1 input port that amplitude-phase offsets network is connected with the input port 1 transmitting, the output port of coupling mechanism Z1 is connected with the output port transmitting 2, the isolated port of coupling mechanism Z1 is connected with matched load Z14, the be coupled input end that transmits signals to attenuator Z2 of port one input of certain energy of the coupling port of coupling mechanism Z1;
Attenuator Z2 carries out the signal receiving to output to after amplitude fading the input end of variable gain amplifier Z3, variable gain amplifier Z3 carries out the signal of reception to output to inter-stage gain adjustable attenuator Z4 after amplitude adjustment, attenuator Z4 carries out the signal receiving to output to analog phase shifter Z5 after amplitude fading, the signal that analog phase shifter Z5 just receives outputs to inter-stage gain adjustable attenuator Z6 after entering horizontal phasing control, the signal that inter-stage gain adjustable attenuator Z6 just receives carries out outputing to power amplifier Z7 after amplitude fading, power amplifier Z7 enters coupling mechanism Z8 by the isolated port D of coupling mechanism Z8 after signal is amplified,
Enter from the isolated port of coupling mechanism Z8 the undesired signal that the input port 3 by receiving signal that the signal of coupling mechanism Z8 and the input port of coupling mechanism Z8 receive is exported, output port vector at coupling mechanism Z8 synthesizes composite signal, and coupling mechanism Z8 coupling port meets matched load Z15;
The input end of coupling mechanism Z9 that self-adaptation the is adjusted structure receipts composite signal that is connected with the output port of coupling mechanism Z8, the coupling port of coupling mechanism Z9 is coupled the composite signal of certain energy to variable gain amplifier Z10, variable gain amplifier Z10 carries out the signal receiving to output to wave detector Z11 after amplitude adjustment, wave detector Z11 carries out the reference voltage biasing desired value of detection output-parallel comparer Z12 and Z13 to the input end of comparer Z12 in parallel and Z13 by the signal receiving, the reference edge of comparer Z12 and Z13 is connected external reference voltage (external reference voltage level is identical with reference voltage biasing desired value), the output terminal output voltage signal of comparer Z12 and Z13 is used for controlling both adjustings to the adjustable side of variable gain amplifier Z3 and analog phase shifter Z5, coupling mechanism Z9 output port is connected with the output port 4 that receives signal, isolated port is connected with matched load Z16.
Described amplitude-phase offsets the coupling mechanism Z1 in network, the degree of coupling of Z8 is not less than 20dB.
The variable gain amplifier attenuation accuracy that described amplitude-phase offsets in network is not more than 0.1dB.
The analog phase shifter Z5 phase-shift phase that described amplitude-phase offsets in network is not less than 360 °, and Phase shift precision is not more than 1 °.
Described amplitude-phase offsets network power amplifier output squeezing point and is not less than 20dBm.
Described self-adaptation is adjusted structure wave detector power-level detector dynamic range and is greater than the interference signal level inhibition scope that receives.
It is relation in parallel that described self-adaptation is adjusted structure comparer, shares same reference voltage.
Described attenuator Z2, Z4, Z5 are gain adjustable attenuator
Four ports offset the adaptive cancellation method of network structure, comprise that step is as follows:
(1) disconnection comparer Z12 and Z13 export between variable gain amplifier Z3 and analog phase shifter Z5 and are connected;
(2) carry out amplitude and phase place adjustment by outer voltage supplied control variable gain amplifier Z3 and simulator phase shifter Z5, the composite signal that the output terminal of coupling mechanism Z8 is exported reaches specified level while output by port 4 after coupling mechanism Z9, the signal of the measuring coupling of wave detector Z11 detection simultaneously device Z9 coupled end output, obtain detecting circuit, and by this detecting circuit value reference voltage biasing desired value of device Z12 and Z13 as a comparison, export and the reference voltage reference edge of the identical magnitude of voltage of desired value to comparer Z12 and Z13 of setovering by outside;
(3) recovery comparer Z12 and Z13 export between variable gain amplifier Z3 and analog phase shifter Z5 and are connected,, four ports offset network can realize self-adaptation adjustment.
Variable gain amplifier in described step (2) and the adjustment of analog phase shifter phase-shift phase can repeat the minimum level value when finding optimum leakage to transmit to be offseted three to four times.
The present invention's advantage is compared with prior art:
(1) the invention solves transmitting-receiving simultaneously, with frequently, with channel isolation and the larger problem of practical application gap of " three homologous rays " of antenna, greatly improve channel isolation, range of application is wider simultaneously, except having using value in large-scale national defence projects such as space flight, in heavy construction, in hydraulic engineering microdisplacement measurement, also all there are application prospect and practical value, simultaneously, solve the principal element transmitting-receiving isolation of restriction and restriction continuous wave radar application and development, break radar come out since always taking pulse system as main, also with frequently, with antenna asynchronous " two homologous rays " general layout, start " three homologous rays " new situation, greatly improve transinformation, range resolution and velocity resolution, and radar viability afield.
(2) the present invention proposes one leakage signal target level is coupled to detecting circuit value as the common reference voltage of comparer in parallel, comparer output two-way voltage in parallel is adjusted variable gain amplifier and analog phase shifter self-adaptation, realize adaptive cancellation, simple in structure, automaticity is high, save a large amount of human costs, improved efficiency.
(3) the present invention, without single-chip microcomputer and complicated program requirement, reduces costs greatly, and the present invention simultaneously adopts conventional ripening device in realization, cost low-risk is little, in the time that more high band uses, only need select high-frequency device of the same type replaceable, applicability is stronger, and reliability is high.
Brief description of the drawings
Fig. 1 is that self-adaptation four ports of the present invention offset schematic network structure;
Fig. 2 is that the present invention's four ports offset network test result schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
The present invention proposes one is necessarily transmitted signals to and offsets branch road from transmitting chain coupling by coupling mechanism, this coupled signal is through excessive dynamic variable gain amplifier and be greater than 360 ° of analog phase shifters and carry out amplitude-phase debugging, what the front end of the same frequency transmitting chain that this coupled signal and receiver receive was revealed transmit is closed and is reached amplitude equal phase behind road and differ 180 ° by coupling mechanism, realizes revealing undesired signal and suppressing after vector is synthetic.Reasonable layout offsets the gain profiles of branch road, ensure that key modules analog phase shifter is in linear working state, offset variable gain amplifier in branch road and must ensure that adjustable extent is greater than 30dB, analog phase shifter must ensure that adjustable extent is greater than 360 ° of ability and greatly dynamically offsets ability, coupling mechanism degree of coupling 20dB, ensure the thermonoise coefficient of port 3 to port 4, the present invention proposes a kind of adaptive cancellation simultaneously, set the ability that offsets that large dynamic four ports of self-adaptation offset network, also set the output level of port 4, carry out detection output voltage V by port 4 certain energy that is coupled
detectionas the negative pin input voltage of comparer in parallel, and set self-adaptation at the positive pin of comparer in parallel when debugging, to start to control reference voltage be V
reference=V
detection.After loop closure, just can realize self-adaptation amplitude, phase place adjustment, finally realize adaptive cancellation function.
As shown in Figure 1, a kind of self-adaptation four ports of the present invention offset network structure and comprise: amplitude-phase offsets network, self-adaptation is adjusted structure, described amplitude-phase offsets network and comprises again coupling mechanism Z1, Z8, variable gain amplifier Z3, analog phase shifter Z5, power amplifier Z7, matched load Z14, Z15, Z16, attenuator Z2, Z4, Z6; Described self-adaptation is adjusted structure and is comprised again coupling mechanism Z9, comparer Z12, Z13, wave detector Z11, variable gain amplifier Z10, matched load Z16;
Transmit and export from port one input, port 2, the reception signal that contains compromising emanation signal from port 3 input, port 4 exports;
The coupling mechanism Z1 input port that amplitude-phase offsets network is connected with the input port 1 transmitting, the output port of coupling mechanism Z1 is connected with the output port transmitting 2, the isolated port of coupling mechanism Z1 is connected with matched load Z14, the be coupled input end that transmits signals to attenuator Z2 of port one input of certain energy of the coupling port of coupling mechanism Z1;
Attenuator Z2 carries out the signal receiving to output to after amplitude fading the input end of variable gain amplifier Z3, variable gain amplifier Z3 carries out the signal of reception to output to inter-stage gain adjustable attenuator Z4 after amplitude adjustment, attenuator Z4 carries out the signal receiving to output to analog phase shifter Z5 after amplitude fading, the signal that analog phase shifter Z5 just receives outputs to inter-stage gain adjustable attenuator Z6 after entering horizontal phasing control, the signal that inter-stage gain adjustable attenuator Z6 just receives carries out outputing to power amplifier Z7 after amplitude fading, power amplifier Z7 enters coupling mechanism Z8 by the isolated port D of coupling mechanism Z8 after signal is amplified,
Enter from the isolated port of coupling mechanism Z8 the undesired signal that the input port 3 by receiving signal that the signal of coupling mechanism Z8 and the input port of coupling mechanism Z8 receive is exported, output port vector at coupling mechanism Z8 synthesizes composite signal, and coupling mechanism Z8 coupling port meets matched load Z15;
The input end of coupling mechanism Z9 that self-adaptation the is adjusted structure receipts composite signal that is connected with the output port of coupling mechanism Z8, the coupling port of coupling mechanism Z9 is coupled the composite signal of certain energy to variable gain amplifier Z10, variable gain amplifier Z10 carries out the signal receiving to output to wave detector Z11 after amplitude adjustment, wave detector Z11 carries out the reference voltage biasing desired value of detection output-parallel comparer Z12 and Z13 to the input end of comparer Z12 in parallel and Z13 by the signal receiving, the reference edge of comparer Z12 and Z13 is connected external reference voltage (external reference voltage level is identical with reference voltage biasing desired value), the output terminal output voltage signal of comparer Z12 and Z13 is used for controlling both adjustings to the adjustable side of variable gain amplifier Z3 and analog phase shifter Z5, coupling mechanism Z9 output port is connected with the output port 4 that receives signal, isolated port is connected with matched load Z16.
Amplitude-phase offsets the coupling mechanism Z1 in network, the degree of coupling of Z8 is not less than 20dB.
The variable gain amplifier attenuation accuracy that amplitude-phase offsets in network is not more than 0.1dB.
The analog phase shifter Z5 phase-shift phase that amplitude-phase offsets in network is not less than 360 °, and Phase shift precision is not more than 1 °.
Amplitude-phase offsets network power amplifier output squeezing point and is not less than 20dBm.
Self-adaptation is adjusted structure wave detector power-level detector dynamic range and is greater than the interference signal level inhibition scope that receives.
It is relation in parallel that self-adaptation is adjusted structure comparer, shares same reference voltage.
Attenuator Z2, Z4, Z5 are gain adjustable attenuator
Four ports offset the adaptive cancellation method of network structure, comprise that step is as follows:
(1) disconnection comparer Z12 and Z13 export between variable gain amplifier Z3 and analog phase shifter Z5 and are connected;
(2) carry out amplitude and phase place adjustment by outer voltage supplied control variable gain amplifier Z3 and simulator phase shifter Z5, the composite signal that the output terminal of coupling mechanism Z8 is exported reaches specified level while output by port 4 after coupling mechanism Z9, the signal of the measuring coupling of wave detector Z11 detection simultaneously device Z9 coupled end output, obtain detecting circuit, and by this detecting circuit value reference voltage biasing desired value of device Z12 and Z13 as a comparison, export and the reference voltage reference edge of the identical magnitude of voltage of desired value to comparer Z12 and Z13 of setovering by outside;
(3) recovery comparer Z12 and Z13 export between variable gain amplifier Z3 and analog phase shifter Z5 and are connected,, four ports offset network can realize self-adaptation adjustment.
Variable gain amplifier in step (2) and the adjustment of analog phase shifter phase-shift phase can repeat the minimum level value when finding optimum leakage to transmit to be offseted three to four times.
Further illustrate structure composition of the present invention and principle of work with a specific embodiment below:
Self-adaptation four ports offset network realize functional parameter and interface relationship as follows:
Input and output frequency: 100MHz;
Three dB bandwidth: 10kHz;
Port one incoming level: 10dBm;
Port 3 incoming levels :+10dBm;
Port 4 output levels: be not more than-60dBm;
Port identity: port one to port 2 insertion loss are not more than 1dB
Port 3 to port 4 insertion loss are not more than 1dB
Port one is greater than 30dB to port 4 amplitude continuous tuning ranges, and phase place continuous tuning range is greater than 360 °
Voltage standing wave ratio (VSWR): be less than or equal to 1.50:1;
Port one input signal is coupled to and offsets tributary signal through coupling mechanism, after amplitude-phase is adjusted
the homogenous frequency signal of inputting with port 3
output port O at coupling mechanism Z8 is synthetic, and two paths of signals amplitude equates to be V
1=V
2, phase place meets θ
2=θ
1when ± n × 180 ° conditions, two paths of signals reaches completely and offsets, wherein θ
2, θ
1be respectively the phase place of port one and port 3 input signals.Insulated degree requirement is 70dB, port 3 incoming levels are+10dBm, therefore port 4 output levels are-60dBm, wherein key is how to realize the adjustment of amplitude-phase self-adaptation, implementation method is to make port 4 level guarantee-60dBm (port one, 2 connects matched load) at port 3 input signals under open loop condition, now measures wave detector detection output voltage V
detection, the reference voltage V of two parallel comparators is set
reference=V
detectionthen two comparer control voltages are connected and carry out closed loop with variable gain amplifier, analog phase shifter control voltage end, at port one input 100MHz level+10dBm signal, port 2 connects matched load, port 3 is inputted 100MHz level+10dBm, tests 100MHz signal output level ensure be not more than-60dBm from port 4.
Test result as shown in Figure 2, self-adaptation four ports offset the parameter S of the network port 3 to port 4
43dynamic range is-and 70.22dB is to-0.36dB, and this offsets the total scope that offsets of network and reaches 70.13dB.
The present invention has been successfully applied in certain telstar model, has been successfully completed the receiving and transmitting signal good design of spacecraft.The invention solves transmitting-receiving simultaneously, with frequently, with channel isolation and the larger problem of practical application gap of " three homologous rays " of antenna, applied range all has application prospect and practical value in heavy construction, hydraulic engineering microdisplacement measurement.Simultaneously, well solve the principal element transmitting-receiving isolation of restriction and restriction continuous wave radar application and development, break radar come out since always taking pulse system as main, also be with frequently, with antenna asynchronous " two homologous rays " general layout, start " three homologous rays " new situation, greatly improve transinformation, range resolution and velocity resolution and radar viability afield.
The content not being described in detail in instructions of the present invention belongs to those skilled in the art's known technology.
Claims (10)
1. self-adaptation four ports offset network structure, it is characterized in that comprising: amplitude-phase offsets network, self-adaptation is adjusted structure, described amplitude-phase offsets network and comprises again coupling mechanism Z1, Z8, variable gain amplifier Z3, analog phase shifter Z5, power amplifier Z7, matched load Z14, Z15, Z16, attenuator Z2, Z4, Z6; Described self-adaptation is adjusted structure and is comprised again coupling mechanism Z9, comparer Z12, Z13, wave detector Z11, variable gain amplifier Z10, matched load Z16;
Transmit and export from port one input, port 2, the reception signal that contains compromising emanation signal from port 3 input, port 4 exports;
The coupling mechanism Z1 input port that amplitude-phase offsets network is connected with the input port 1 transmitting, the output port of coupling mechanism Z1 is connected with the output port transmitting 2, the isolated port of coupling mechanism Z1 is connected with matched load Z14, the be coupled input end that transmits signals to attenuator Z2 of port one input of certain energy of the coupling port of coupling mechanism Z1;
Attenuator Z2 carries out the signal receiving to output to after amplitude fading the input end of variable gain amplifier Z3, variable gain amplifier Z3 carries out the signal of reception to output to inter-stage gain adjustable attenuator Z4 after amplitude adjustment, attenuator Z4 carries out the signal receiving to output to analog phase shifter Z5 after amplitude fading, the signal that analog phase shifter Z5 just receives outputs to inter-stage gain adjustable attenuator Z6 after entering horizontal phasing control, the signal that inter-stage gain adjustable attenuator Z6 just receives carries out outputing to power amplifier Z7 after amplitude fading, power amplifier Z7 enters coupling mechanism Z8 by the isolated port D of coupling mechanism Z8 after signal is amplified,
Enter from the isolated port of coupling mechanism Z8 the undesired signal that the input port 3 by receiving signal that the signal of coupling mechanism Z8 and the input port of coupling mechanism Z8 receive is exported, output port vector at coupling mechanism Z8 synthesizes composite signal, and coupling mechanism Z8 coupling port meets matched load Z15;
The input end of coupling mechanism Z9 that self-adaptation the is adjusted structure receipts composite signal that is connected with the output port of coupling mechanism Z8, the coupling port of coupling mechanism Z9 is coupled the composite signal of certain energy to variable gain amplifier Z10, variable gain amplifier Z10 carries out the signal receiving to output to wave detector Z11 after amplitude adjustment, wave detector Z11 carries out the reference voltage biasing desired value of detection output-parallel comparer Z12 and Z13 to the input end of comparer Z12 in parallel and Z13 by the signal receiving, the reference edge of comparer Z12 and Z13 is connected external reference voltage, the output terminal output voltage signal of comparer Z12 and Z13 is used for controlling both adjustings to the adjustable side of variable gain amplifier Z3 and analog phase shifter Z5, coupling mechanism Z9 output port is connected with the output port 4 that receives signal, isolated port is connected with matched load Z16.
2. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: described amplitude-phase offsets the coupling mechanism Z1 in network, the degree of coupling of Z8 is not less than 20dB.
3. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: the variable gain amplifier attenuation accuracy that described amplitude-phase offsets in network is not more than 0.1dB.
4. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: the analog phase shifter Z5 phase-shift phase that described amplitude-phase offsets in network is not less than 360 °, and Phase shift precision is not more than 1 °.
5. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: described amplitude-phase offsets network power amplifier output squeezing point and is not less than 20dBm.
6. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: described self-adaptation is adjusted structure wave detector power-level detector dynamic range and is greater than the interference signal level inhibition scope that receives.
7. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: it is relation in parallel that described self-adaptation is adjusted structure comparer, share same reference voltage.
8. offset network structure according to a kind of self-adaptation four ports described in right 1, it is characterized in that: described attenuator Z2, Z4, Z5 are gain adjustable attenuator.
9. four ports based on described in right 1 offset the adaptive cancellation method of network structure, it is characterized in that step is as follows:
(1) disconnection comparer Z12 and Z13 export between variable gain amplifier Z3 and analog phase shifter Z5 and are connected;
(2) carry out amplitude and phase place adjustment by outer voltage supplied control variable gain amplifier Z3 and simulator phase shifter Z5, the composite signal that the output terminal of coupling mechanism Z8 is exported reaches specified level while output by port 4 after coupling mechanism Z9, the signal of the measuring coupling of wave detector Z11 detection simultaneously device Z9 coupled end output, obtain detecting circuit, and by this detecting circuit value reference voltage biasing desired value of device Z12 and Z13 as a comparison, export and the reference voltage reference edge of the identical magnitude of voltage of desired value to comparer Z12 and Z13 of setovering by outside;
(3) recovery comparer Z12 and Z13 export between variable gain amplifier Z3 and analog phase shifter Z5 and are connected,, four ports offset network can realize self-adaptation adjustment.
10. adaptive cancellation method according to claim 9, is characterized in that: the variable gain amplifier in described step (2) and the adjustment of analog phase shifter phase-shift phase can repeat the minimum level value when finding optimum leakage to transmit to be offseted three to four times.
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| CN107219485B (en) * | 2017-05-22 | 2019-09-24 | 中国电子科技集团公司第四十一研究所 | Phase difference value applied to Multipactor detection calculates balancing controls and method |
| CN108539416A (en) * | 2018-01-29 | 2018-09-14 | 上海安费诺永亿通讯电子有限公司 | With frequency dual-antenna system and decoupling method and antenna equipment and mobile terminal |
| CN108539416B (en) * | 2018-01-29 | 2021-01-15 | 上海安费诺永亿通讯电子有限公司 | Same-frequency dual-antenna system, decoupling method, antenna equipment and mobile terminal |
| CN109302199A (en) * | 2018-05-14 | 2019-02-01 | 上海创远仪器技术股份有限公司 | A kind of device for realizing the isolation of 4G and 5G TDD two-way channel simulator automatic transceiving |
| CN109343045A (en) * | 2018-08-24 | 2019-02-15 | 南京理工大学 | A kind of cell level digital canceller method applied to vehicle-mounted continuous wave radar |
| CN109067384A (en) * | 2018-09-14 | 2018-12-21 | 北京遥感设备研究所 | A kind of isolation rearrangeable switch |
| CN114337710A (en) * | 2022-03-08 | 2022-04-12 | 深圳市鼎阳科技股份有限公司 | Gain switching circuit for receiving radio frequency signal and radio frequency receiver |
| CN114337710B (en) * | 2022-03-08 | 2022-06-03 | 深圳市鼎阳科技股份有限公司 | Gain switching circuit for receiving radio frequency signal and radio frequency receiver |
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