CN113138371A - Broadband near-field measurement system and method for amplitude phase rapid calibration of radio frequency link - Google Patents
Broadband near-field measurement system and method for amplitude phase rapid calibration of radio frequency link Download PDFInfo
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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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a broadband near-field measurement system and a method for quickly calibrating the amplitude phase of a radio frequency link. The system comprises a mechanical turntable, a system circuit board, an upper computer and an electric displacement platform; the system circuit board is provided with a broadband near-field measuring circuit, and a transmitting end coupler interface, a receiving end coupler interface and a communication interface which are respectively connected with a transmitting antenna and a link, a receiving antenna and a link and an upper computer are arranged on the system circuit board; the transmitting antenna and the link are installed on the mechanical turntable, and the receiving antenna and the link are installed on the electric displacement platform. The broadband near-field measuring circuit comprises a broadband transmitter, a low-intermediate frequency receiver, two couplers and a digital signal processing module. The measurement system provided by the invention can obviously improve the calibration speed of the phased array transceiving channel.
Description
Technical Field
The invention relates to the field of phased array radar measurement, in particular to a broadband near field measurement system and method for amplitude phase rapid calibration of a radio frequency link.
Background
In a phased array antenna system, a desired beam sweep is obtained by adjusting the phase of each antenna element. However, due to structural errors caused by processing accuracy, inconsistency of the device, mutual coupling between the antenna units and the like, the amplitude and the phase of each antenna unit are different from expected values, and the array performance cannot reach an ideal working state. Therefore, after the phased array antenna is assembled, amplitude and phase calibration is required to obtain an amplitude phase difference, and then compensation is performed by adjusting feeding.
The method for calibrating the amplitude and phase of the current mainstream phased array link comprises the following steps: near field measurement, rotation vector method, mutual coupling calibration method and commutation measurement method. Wherein the traditional near-field measurement method needs a displacement platform and a vector network analyzer. The measurement data volume is many, and measurement accuracy is high. The rotation vector method and the mutual coupling calibration method have requirements on the performance of the phased array antenna and are not universal. The commutation testing method has simple measuring structure, but complex experimental algorithm and low efficiency.
The near-field measurement method comprises a plane near field, a cylindrical surface near field and a spherical surface near field. The planar approach requires that a measured object is fixed, the probe scans and moves on a specific plane, and when the scanning plane is large enough, the measurement result is more accurate; the spherical near-field test is a test for the whole space around the antenna, theoretically, the measurement error is minimum, but the precision requirement for the turntable is higher. The general phased array radar needs a wide scanning angle, which makes the scanning plane of the planar approach measurement method large, but not the omnidirectional radiation characteristic, so that the advantage of the spherical near-field measurement is reduced. The advantages of the cylindrical near field measurement are manifested.
The traditional near-field measurement method needs to utilize a commercial vector network analyzer to scan S parameters, although the scanning speed is high, the vector network analyzer and a computer end are transmitted through a network port, and the transmission speed is low. For example, a phased array channel with 256 array sources, each channel having 6 digitally controlled phase shifters and 4 attenuators, requires about 12-15 hours of scanning and transmission time for calibration using a commercial vector network analyzer. Despite the use of a programmed mechanical turntable for scanning, there is still a need to manually observe the problems of mechanical failure and data acquisition errors that occur during the scanning process.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the device for fast amplitude-phase calibration, which are independent of a commercial vector network analyzer, are provided to overcome the problems and the defects of slow transmission rate of scanning data in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a broadband near-field measuring circuit for quickly calibrating amplitude and phase of a radio frequency link comprises a broadband transmitter, a low-intermediate frequency receiver, two couplers and a digital signal processing module; the low intermediate frequency receiver comprises two same down-conversion links; the signal output end of the broadband transmitter is connected with the input ends of the two couplers through a first single-pole double-throw switch, the isolation ends and the coupling ends of the two couplers are respectively connected with the signal input end of the down-conversion link through a second single-pole double-throw switch and a fifth single-pole double-throw switch, and the straight-through ends of the two couplers are respectively connected with a transmitting antenna and a link, and a receiving antenna and a link; and the signal output end of the low and intermediate frequency receiver is connected with a digital signal processing module, and the digital signal processing module is used for calculating the amplitude and the phase of an input signal and inputting a calculation result into an upper computer.
Furthermore, the broadband transmitter comprises a broadband phase-locked loop, a third single-pole double-throw switch, a fourth single-pole double-throw switch, a frequency multiplication link and an automatic level control circuit; the signal output end of the broadband phase-locked loop is connected with the movable end of a third single-pole double-throw switch, two immovable ends of the third single-pole double-throw switch are respectively connected with one immovable end of a fourth single-pole double-throw switch and the signal input end of a frequency doubling link, the signal output end of the frequency doubling link is connected with the other immovable end of the fourth single-pole double-throw switch, the movable end of the fourth single-pole double-throw switch is connected with the signal input end of an automatic level control circuit, and the signal output end of the automatic level control circuit is connected with the movable end of the first single-pole double-throw switch.
The broadband phase-locked loop or the broadband phase-locked loop is excited by an amplifier and a frequency multiplier, the excitation is carried out by a filter, the output power is adjusted by an automatic level control circuit, a single-pole double-throw switch is switched to a transmitting end, an output signal is fed into a transmitting antenna and a link, and meanwhile, a part of energy is coupled to a radio frequency port of a mixer in a low-intermediate frequency receiver by a coupler of the transmitting end and the single-pole double-throw switch.
Further, the automatic level control circuit comprises an adjustable attenuator, a micro control unit and a power detector; the adjustable attenuator and the power detector are connected with the moving end of the fourth single-pole double-throw switch, and the micro-control unit is connected with the power detector.
Further, the low-intermediate frequency receiver comprises two down-conversion links, a power divider and a broadband local oscillation source; the down-conversion link comprises a mixer, an amplifier and a filter which are connected in sequence; the input ends of the two frequency mixers are respectively connected with the moving ends of the second single-pole double-throw switch and the fifth single-pole double-throw switch; local oscillation signals output by the broadband local oscillation source are respectively accessed to local oscillation ports of the two frequency mixers through the power divider. The receiving antenna and the link receive the signal of the transmitting antenna, and couple a part of energy to feed into a radio frequency port of another mixer in the low-intermediate frequency receiver through a coupler and a single-pole double-throw switch of the receiving end. The broadband local vibration source comprises a broadband phase-locked loop, an amplifier and a frequency multiplier, generates an excitation signal, and the signal is fed into local vibration ports of the two frequency mixers in two paths through the power divider after the power of the signal is adjusted by the filter and the attenuator.
Furthermore, the digital signal processing module comprises an analog-to-digital converter and a field programmable array circuit, wherein the signal input end of the analog-to-digital converter is connected with the signal output end of the low-intermediate frequency receiver, the signal output end of the analog-to-digital converter is connected with the signal input end of the field programmable array circuit, and the signal output end of the field programmable array circuit is connected with an upper computer. And the signals of the two down-conversion links pass through an analog-to-digital converter to obtain digital signals, the digital signals enter a field editable array to carry out digital frequency conversion, comb filtering, non-recursive filtering and amplitude phase solution to obtain the amplitude and the phase.
Furthermore, the coupler is a strip line directional coupler and is composed of multiple stages of parallel coupling strip lines, and the requirements of high bandwidth are met by pressing tight coupling through a metal structural part.
The broadband near-field measurement system based on the circuit comprises a mechanical turntable, a system circuit board, an upper computer and an electric displacement platform; the system circuit board is provided with the broadband near-field measuring circuit, and a transmitting end coupler interface, a receiving end coupler interface and a communication interface which are respectively connected with a transmitting antenna and a link, a receiving antenna and a link and an upper computer are arranged on the system circuit board; the transmitting antenna and the link are installed on the mechanical turntable, and the receiving antenna and the link are installed on the electric displacement platform. The system circuit board is integrated with a broadband transmitter, a low and medium frequency receiver, two couplers, a digital signal processing module and a high-speed interface circuit, and two ends of the high-speed interface circuit are respectively connected with the digital signal processing module and an upper computer.
Further, the measurement method based on the broadband near-field measurement system comprises the following steps:
(1) starting a system circuit, connecting the interfaces of a transmitting end strip line directional coupler and a receiving end strip line directional coupler on the system circuit board with a transmitting antenna and a receiving antenna respectively, connecting a data interface with a computer, and switching a single-pole double-throw switch at the rear stage of an automatic level control circuit into a transmitting end;
(2) the current program in the upper computer is used for accurately adjusting the rotation angle of the mechanical turntable, and meanwhile, the position of the electric displacement platform is manually adjusted to align the transmitting antenna and the receiving antenna;
(3) the upper computer sets the sweep frequency range and step according to the working frequency band of the transmitting antenna;
(4) and starting frequency sweeping, and receiving and storing data sent by the system circuit board by the upper computer to finish the measurement of the transmitting antenna and the link thereof.
(5) Switching a single-pole double-throw switch at the rear stage of the automatic level control circuit into a receiving end, and repeating the steps (2) - (4) to finish the measurement of the receiving antenna and the link thereof;
(6) and the upper computer obtains the complete transmitting, maps and processes the amplitude phase value of the receiving antenna and the link thereof, and reconfigures the amplitude phase of the feeding thereof to finish the calibration.
Further, the specific steps of the measurement method include:
step 1: starting a system circuit, switching a first single-pole double-throw switch into a transmitting end coupler, and setting the frequency sweeping range and stepping by an upper computer according to the working frequency band of a transmitting antenna;
step 2: starting frequency sweeping, wherein the output signal of the broadband phase-locked loop passes through a third single-pole double-throw switch, and the third single-pole double-throw switch cuts into one immobile end of a fourth single-pole double-throw switch when low-frequency scanning is carried out; when high-frequency scanning is carried out, the third single-pole double-throw switch is switched into the amplifier, the frequency multiplier and the filter to enter the other fixed end of the fourth single-pole double-throw switch;
and step 3: after the output signal of the fourth single-pole double-throw switch passes through the automatic level control circuit, the first single-pole double-throw switch is switched into the transmitting end coupler, one part of the signal passes through the direct-through end of the transmitting end coupler to be connected with a transmitting antenna and a link, and the other part of the signal passes through the coupling end and is switched into the radio frequency port of the mixer in the low-intermediate frequency receiver through the second single-pole double-throw switch;
and 4, step 4: the signal is received by a receiving antenna and a link to a straight-through end of a receiving end coupler, and after being partially coupled to an isolation end, a fifth single-pole double-throw switch is switched into a radio frequency port of another mixer in the low-intermediate frequency receiver;
and 5: the local oscillation signal output by the broadband local oscillation source is fed into a local oscillation port of a mixer through a power divider, two paths of radio frequency ports are coupled with signals for frequency mixing, and the signals are subjected to calculation to obtain an amplitude value and a phase value through an amplifier, a filter, a digital-to-analog converter and a field programmable array and then are uploaded to an upper computer;
step 6: and the upper computer stores, maps and processes the amplitude and phase values, and reconfigures the feeding phase and amplitude of the antenna and the link thereof by using the measured amplitude and phase values.
Further, a first single-pole double-throw switch is switched into a receiving end coupler to serve as a transmitting end to carry out transmitting and receiving switching, and the steps 1-6 are repeated. The 'transmitting end' and 'receiving end', 'transmitting antenna and link' and 'receiving antenna and link' can be replaced mutually, namely, the receiving and transmitting can be converted.
Has the advantages that: compared with the prior art, the method and the device provided by the invention have the advantages that the dependence on a commercial vector network analyzer is eliminated, the system structure is simple, and the data transmission speed is high. The effects of shortening the measurement time and increasing the amplitude and phase calibration speed are achieved.
Drawings
FIG. 1 is a schematic diagram of a circuit board of the system of the present invention;
FIG. 2 is a schematic diagram of a calibration system measurement connection of the present invention.
Detailed Description
The method and the device for quickly calibrating the amplitude phase are not only suitable for the phased array radar, but also can be a radio frequency link and an antenna of which any amplitude or phase needs to be calibrated. The following detailed description of the embodiments is made with reference to the accompanying drawings:
a broadband near-field measuring circuit for amplitude and phase quick calibration of a radio frequency link is shown in figure 1 and comprises a broadband phase-locked loop 1, a single-pole double-throw switch, a frequency multiplier 3, an amplifier 4, a filter 5, an adjustable attenuator 6, a micro-control unit 7, a power detector 8, a strip line directional coupler 9, a mixer 10, an analog-to-digital converter 11, a field programmable array 12, an upper computer 13, a power divider 14, a transmitting antenna and link 15, and a receiving antenna and link 16.
The circuit has the following functions:
frequency source for realizing broadband programmable frequency sweep
The broadband phase-locked loop 1 is selected and matched with the amplifier 4 and the frequency multiplier 3 to realize a broadband frequency source, the harmonic suppression filter 5 is arranged behind the frequency multiplier 3, and the broadband phase-locked loop is switched to different frequency band links output by the phase-locked loop or the frequency multiplier respectively through the third single-pole double-throw switch 2.3 of the shunt circuit.
The micro control unit 7 is configured with a register of the broadband phase-locked loop 1 to realize frequency scanning of the phase-locked loop chip, the frequency scanning range is determined by the working frequency of the transmitting antenna and the link 15, and then the upper computer 13 sets the frequency scanning range and the frequency scanning stepping through the serial port.
And the filter 5 inhibits the degree to-40 dB. Full-wave simulation software, such as High Frequency Structure Simulator (HFSS) optimized structures and parameters, are used to achieve filter return loss of less than 20dB and insertion loss of less than 3 dB.
Secondly, realizing the automatic adjustment of the transmitting link power
The broadband phase-locked loop 1 outputs a signal or a signal after passing through the amplifier 4, the frequency multiplier 3 and the filter 5, and then is switched to the automatic level control unit through the fourth single-pole double-throw switch 2.4 of the combiner.
The automatic level control unit consists of a power detector 8, an adjustable attenuator 6 and a micro control unit 7, wherein the micro control unit 7 controls the attenuator to stably output the power of an input signal.
Thirdly, realizing the directional coupling of power
After the signal output by the automatic level control unit passes through the first single-pole double-throw switch 2.1 and the strip line directional coupler 9, a part of energy enters a transmitting antenna and a link 15, and the other part of energy is coupled to a down-conversion link of the low-intermediate frequency receiver.
The coupler is designed by adopting a parallel strip line directional coupler structure, and the return loss of the coupler is below 20 dB.
The same stripline directional coupler is used after the receive antenna and the chain 16.
Fourthly, realizing down conversion of transmitting and receiving antenna and link
Two strip line directional couplers 9 are respectively connected with two down-conversion links with the same structure.
The down-conversion chain comprises a broadband local oscillator source, a mixer 10, an amplifier 4, a filter 5 and a digital-to-analog converter 11.
The broadband local vibration source comprises a broadband phase-locked loop 1, a frequency multiplier 3, an amplifier 4 and a filter 5, and the micro control unit 7 controls the local vibration signal output by the broadband local vibration source and the radio frequency signal to always have a fixed frequency difference during frequency scanning.
The local oscillator signals are respectively connected to the local oscillator ports of the two mixers through the power divider 14.
The coupling port of the parallel strip line directional coupler is connected to the radio frequency port of the mixer 10 through the single-pole double-throw switch, and the intermediate frequency output of the mixer is connected to the post-stage amplifier 4 and the filter 5.
Fifthly, digital-to-analog conversion and digital signal processing are realized
The digital to analog conversion and digital signal processing includes a digital to analog converter 11 and a field programmable array 12. The field programmable array collects the output digital signals of the digital-to-analog converter, then the digital signals are subjected to digital down-conversion, comb filters, non-recursive filters and amplitude phase calculation, and the calculation results are stored in the field programmable array 13.
The broadband near-field measurement system based on the circuit comprises a mechanical rotary table 17, a transmitting antenna and link 15, a computer upper computer 13, a receiving antenna and link 16, an electric displacement platform 18, a system circuit board 19 and a coaxial cable 20, as shown in fig. 2.
The use method of the measuring system comprises the following steps:
one, single channel measurement
Adjusting the positions of the mechanical rotary table 17 and the electric displacement platform 18; starting a system circuit board 19, respectively connecting a transmitting end interface and a receiving end interface on the system circuit board 19 with a transmitting antenna and a link 15 and a receiving antenna and a link 16 through a coaxial cable 20, and connecting a data interface with an upper computer 13; the upper computer 13 sets the sweep frequency range and step according to the working frequency band of the transmitting antenna and the link; the frequency sweep is started, and the upper computer 13 receives the processing data on the system circuit board 19.
Second, switching radio frequency link and channel
Keeping the receiving antenna and the link on the electric control displacement platform 17 still, controlling the mechanical rotary table 18 to rotate and switch the channel by the upper computer 13, continuing frequency scanning, repeatedly switching the channel until the calibration of all the transmitting antennas and the channel of the link is finished, and transmitting the measurement result to the upper computer 13.
Thirdly, realizing the switching of the receiving and transmitting channels
Switching the first single-pole double-throw switch 2.1 behind the automatic level control circuit in fig. 1 to the receiving antenna and the link 16, using the transmitting antenna and the link 15 as the receiving antenna and the link, using the receiving antenna and the link 16 as the transmitting antenna and the link, repeating the configuration and the frequency sweeping steps, and realizing the measurement and calibration of the receiving channel of the transmitting antenna and the link.
Claims (9)
1. A broadband near-field measuring circuit for amplitude phase rapid calibration of a radio frequency link is characterized by comprising a broadband transmitter, a low intermediate frequency receiver, two couplers and a digital signal processing module; the low intermediate frequency receiver comprises two same down-conversion links; the signal output end of the broadband transmitter is connected with the input ends of the two couplers through a first single-pole double-throw switch, the isolation ends and the coupling ends of the two couplers are respectively connected with the signal input end of the down-conversion link through a second single-pole double-throw switch and a fifth single-pole double-throw switch, and the straight-through ends of the two couplers are respectively connected with a transmitting antenna and a link, and a receiving antenna and a link; and the signal output end of the low and intermediate frequency receiver is connected with a digital signal processing module, and the digital signal processing module is used for calculating the amplitude and the phase of an input signal and inputting a calculation result into an upper computer.
2. The wideband near-field measurement circuit for amplitude phase fast calibration of a radio frequency link of claim 1, wherein the wideband transmitter comprises a wideband phase locked loop, a third single-pole double-throw switch, a fourth single-pole double-throw switch, a frequency doubling link, and an automatic level control circuit; the signal output end of the broadband phase-locked loop is connected with the movable end of a third single-pole double-throw switch, two immovable ends of the third single-pole double-throw switch are respectively connected with one immovable end of a fourth single-pole double-throw switch and the signal input end of a frequency doubling link, the signal output end of the frequency doubling link is connected with the other immovable end of the fourth single-pole double-throw switch, the movable end of the fourth single-pole double-throw switch is connected with the signal input end of an automatic level control circuit, and the signal output end of the automatic level control circuit is connected with the movable end of the first single-pole double-throw switch.
3. The broadband near-field measurement circuit for amplitude-phase fast calibration of a radio frequency link of claim 2, wherein the automatic level control circuit comprises an adjustable attenuator, a micro control unit and a power detector; the adjustable attenuator and the power detector are connected with the moving end of the fourth single-pole double-throw switch, and the micro-control unit is connected with the power detector.
4. The broadband near-field measurement circuit for the fast calibration of the amplitude phase of the radio frequency link according to claim 2, wherein the low intermediate frequency receiver comprises two down-conversion links, a power divider and a broadband local oscillator source; the down-conversion link comprises a mixer, an amplifier and a filter which are connected in sequence; the input ends of the two frequency mixers are respectively connected with the moving ends of the second single-pole double-throw switch and the fifth single-pole double-throw switch; local oscillation signals output by the broadband local oscillation source are respectively accessed to local oscillation ports of the two frequency mixers through the power divider.
5. The broadband near-field measurement circuit for the amplitude phase quick calibration of the radio frequency link according to claim 1, wherein the digital signal processing module comprises an analog-to-digital converter and a field programmable array circuit, a signal input end of the analog-to-digital converter is connected with a signal output end of the low intermediate frequency receiver, a signal output end of the analog-to-digital converter is connected with a signal input end of the field programmable array circuit, and a signal output end of the field programmable array circuit is connected with an upper computer.
6. The wideband near-field measurement circuit for amplitude phase fast calibration of a radio frequency link of claim 1, wherein the coupler is a stripline directional coupler.
7. The broadband near-field measurement system based on the circuit of claim 1, which is characterized by comprising a mechanical turntable, a system circuit board, an upper computer and an electric displacement platform; the system circuit board is provided with the broadband near-field measuring circuit, and a transmitting end coupler interface, a receiving end coupler interface and a communication interface which are respectively connected with a transmitting antenna and a link, a receiving antenna and a link and an upper computer are arranged on the system circuit board; the transmitting antenna and the link are installed on the mechanical turntable, and the receiving antenna and the link are installed on the electric displacement platform.
8. A broadband near-field measurement method based on the broadband near-field measurement system of claim 7, characterized by comprising the steps of:
step 1: starting a system circuit, switching a first single-pole double-throw switch into a transmitting end coupler, and setting the frequency sweeping range and stepping by an upper computer according to the working frequency band of a transmitting antenna;
step 2: starting frequency sweeping, wherein the output signal of the broadband phase-locked loop passes through a third single-pole double-throw switch, and the third single-pole double-throw switch cuts into one immobile end of a fourth single-pole double-throw switch when low-frequency scanning is carried out; when high-frequency scanning is carried out, the third single-pole double-throw switch is switched into the amplifier, the frequency multiplier and the filter to enter the other fixed end of the fourth single-pole double-throw switch;
and step 3: after the output signal of the fourth single-pole double-throw switch passes through the automatic level control circuit, the first single-pole double-throw switch is switched into the transmitting end coupler, one part of the signal passes through the direct-through end of the transmitting end coupler to be connected with a transmitting antenna and a link, and the other part of the signal passes through the coupling end and is switched into the radio frequency port of the mixer in the low-intermediate frequency receiver through the second single-pole double-throw switch;
and 4, step 4: the signal is received by a receiving antenna and a link to a straight-through end of a receiving end coupler, and after being partially coupled to an isolation end, a fifth single-pole double-throw switch is switched into a radio frequency port of another mixer in the low-intermediate frequency receiver;
and 5: the local oscillation signal output by the broadband local oscillation source is fed into a local oscillation port of a mixer through a power divider, two paths of radio frequency ports are coupled with signals for frequency mixing, and the signals are subjected to calculation to obtain an amplitude value and a phase value through an amplifier, a filter, a digital-to-analog converter and a field programmable array and then are uploaded to an upper computer;
step 6: and the upper computer stores, maps and processes the amplitude and phase values, and reconfigures the feeding phase and amplitude of the antenna and the link thereof by using the measured amplitude and phase values.
9. The broadband near-field measurement method of claim 8, further comprising step 7: and (3) switching the first single-pole double-throw switch into the receiving end coupler to be used as a transmitting end to carry out transmitting-receiving switching, and repeating the steps 1-6.
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| CN114157372A (en) * | 2021-12-07 | 2022-03-08 | 中电科思仪科技股份有限公司 | Phase and insertion loss measuring device and method |
| CN115940988A (en) * | 2022-11-17 | 2023-04-07 | 中国电子科技集团公司第二十九研究所 | Ultrathin broadband transceiving array calibration network and use method thereof |
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| CN114157372A (en) * | 2021-12-07 | 2022-03-08 | 中电科思仪科技股份有限公司 | Phase and insertion loss measuring device and method |
| CN114157372B (en) * | 2021-12-07 | 2024-04-16 | 中电科思仪科技股份有限公司 | Phase and insertion loss measuring device and method |
| CN115940988A (en) * | 2022-11-17 | 2023-04-07 | 中国电子科技集团公司第二十九研究所 | Ultrathin broadband transceiving array calibration network and use method thereof |
| CN115940988B (en) * | 2022-11-17 | 2024-03-26 | 中国电子科技集团公司第二十九研究所 | Ultra-thin broadband transceiver array calibration network and application method thereof |
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