537 results about "Directional coupling" patented technology

The invention discloses a calibration system in an active channel of a waveguide array phased-array antenna, and relates to the technical field of calibration in the active channel. Comprising a calibration judgment module, a waveguide directional coupling module, an amplitude-phase detection module and a digital domain optimization module, the calibration judgment module realizes intelligent triggering calibration through real-time monitoring of a multi-dimensional environment and performance parameters, and ensures that a calibration process is started only when the system state is deteriorated; the waveguide directional coupling module ensures that the calibration signal is accurately injected into each channel, and realizes cross polarization suppression through a polarization grid filter; the amplitude-phase detection module realizes high-precision measurement of amplitude, phase, group delay and polarization parameters of feedback signals of each channel by using superheterodyne and IQ demodulation technologies; and the digital domain optimization module calculates and updates the complex compensation weight of each channel through real-time digital signal processing and a self-adaptive algorithm, and realizes comprehensive and accurate calibration in combination with temperature-frequency interpolation and nonlinear pre-distortion compensation.

The invention discloses a response time conduction type testing device and method for a radio frequency channel protection device. The response time conduction type testing device comprises a transient field intensity generating device, an isolator, a directional coupler, a first attenuator, a second attenuator, a third attenuator, a first power meter, a second power meter, a high-speed oscilloscope, a vector network analyzer and a radio frequency channel protection device to be tested. According to the method, the response performance of the protection device under the influence of the transient strong field can be comprehensively, safely and accurately evaluated, the amplitude limiting function of the protection device can still be effectively exerted under the action of the transient strong field with an extremely narrow rising edge, and then subsequent devices, circuits and equipment are prevented from being damaged.

The invention discloses an orthogonal directional coupler and a microwave system based on a micro-coaxial technology, the orthogonal directional coupler comprises a metal outer conductor, an upper inner conductor and a lower inner conductor, the upper inner conductor and the lower inner conductor are suspended in the metal outer conductor through a periodic medium support loading structure; the upper inner conductor and the lower inner conductor serve as two identical micro coaxial coupling lines to be cascaded, the micro coaxial coupling lines are symmetrical multi-stage impedance stepped couplers, each micro coaxial coupling line is provided with n coupling units, the coupler structure is symmetrical about the center coupling unit, the upper inner conductor and the lower inner conductor are overlapped in the axial direction at the center coupling unit, and the upper inner conductor and the lower inner conductor are overlapped in the axial direction at the center coupling unit. The upper inner conductor and the lower inner conductor extend from the center coupling unit to the two ends, the upper inner conductor and the lower inner conductor deviate from the center to the two sides, and the closer to the coupling units at the two ends, the larger the offset is; the ultra-wideband orthogonal antenna can work in the frequency range of 5 GHz to 100 GHz, the return loss is superior to 15 dB, the phase change is smaller than 5.5 degrees, the directivity is superior to 10 dB, and the ultra-wideband orthogonal antenna can be used for generating ultra-wideband orthogonal signals.

A device comprises a superconducting quantum circuit comprising a coupler which is coupled to a first quantum bit and a second quantum bit. The coupler comprises a tunable coupler and a fixed coupler. The coupler is configured to operate in a first mode to suppress coupling between the first quantum bit and the second quantum bit, when the tunable coupler is tuned to have a first frequency which corresponds to a fixed frequency of the fixed coupler. The coupler is configured to operate in a second mode to enable coupling between the first quantum bit and the second quantum bit, when the tunable coupler is tuned to have a second frequency which is different from the fixed frequency of the fixed coupler.

The invention relates to a circularly polarized quasi-absorption filtering phased-array antenna. A unit of the antenna comprises a multi-layer dielectric substrate, a semi-cured layer, a metal floor, a stacked patch and an orthogonal H-shaped gap, the first dielectric substrate is provided with a parasitic square loop, the second dielectric substrate is provided with a cross-shaped strip, and radiation zero points are introduced to the upper and lower edges of a passband respectively; the 3dB orthogonal directional coupler and the L-shaped feeder form a feed network, circularly polarized radiation is realized through slot coupling, and an isolation port of the 3dB orthogonal directional coupler is connected with a 50-ohm resistor, so that the energy of a lower stop band is absorbed, the energy of an upper stop band is reflected, and a quasi-absorption filtering characteristic is presented; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good filtering performance, and when array scanning is 0-45 degrees, the overlapping impedance bandwidth is 12%, the axial ratio bandwidth is 15.8%, and the maximum scanning loss is 2.3 dB; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good quasi-absorption filtering performance, and has huge potential in millimeter wave satellite communication application.

The invention relates to the technical field of radio frequency generator circuits, and provides a phase-locking frequency-stabilizing multi-core control radio frequency system, which processes I / Q signals and constructs a multi-core task allocation and cooperation mechanism through a digital baseband processing module, and performs pre-distortion processing and system scheduling. The double-closed-loop control module is used for stabilizing fundamental frequency, correcting temperature drift and compensating and adjusting frequency swing amplitude; the hybrid power amplification module is used for performing multi-stage hybrid power amplification signal processing and temperature monitoring through a driving stage and output stage combined topology; and the feedback sampling network module collects output signals in real time through a directional coupler and feeds back, adjusts and precisely controls the frequency stability according to the output signals.

A base station antenna includes a calibration circuit that has a plurality of pairs of directional couplers and an antenna array that includes a plurality of columns of radiating elements. The first polarization radiators of the radiating elements in each column are electrically connected to a first directional coupler of a respective one of the pairs, and the second polarization radiators of the radiating elements in the column are electrically connected to a second directional coupler of the respective one of the pairs. The directional couplers may be arranged in a manner that reduces in-column coupling and / or that reduces cross-column coupling between adjacent columns of radiating elements.

The utility model provides a directional coupler and a radio frequency chip, and relates to the technical field of electronic communication. The directional coupler comprises an input port, an output port, a coupling port, an isolation port and an impedance adjusting network, the impedance adjusting network comprises an access switch, an impedance adjusting module and an inductance unit. The impedance adjusting module comprises an adjustable resistor unit and an adjustable capacitor unit which are connected in parallel; one end of the impedance adjusting module is connected to the isolation port through the access switch, and the other end of the impedance adjusting module is connected to the inductance unit; wherein the inductance unit is used for compensating parasitic capacitance in the directional coupler. According to the scheme, the impedance matching and phase characteristics of the directional coupler can be adjusted according to different working frequencies and environmental conditions through mutual cooperation of the access switch, the impedance adjusting module and the inductance unit, so that the directional coupler can maintain good directivity under various working conditions.

The invention discloses a microwave reflectometer system. An arbitrary waveform generator generates a microwave signal through an X-Ku signal source unit; the coaxial directional coupler divides the generated microwave signal into two paths, one path enters the transmitting unit, and the other path enters the reference unit; a microwave signal entering the transmitting unit is transmitted into the plasma through a fundamental mode rectangular waveguide in the transmitting circuit; the microwave signal entering the reference unit is subjected to flight time compensation through a delay line and then is mixed with a reflected signal received by the receiving unit in a balanced mixer; the calibration unit carries out secondary frequency mixing on the dispersion calibration voltage-time curve signal and the signal obtained after primary frequency mixing of the balanced frequency mixer so as to eliminate dispersion interference; the acquisition card acquires an output signal after secondary frequency mixing of the calibration unit. The system can be integrated with an ion cyclotron resonance antenna, the inherent defects of large attenuation and high dispersion of a long-distance fundamental mode waveguide are overcome, and a high-frequency fundamental mode waveguide through-wall scheme meeting ultrahigh vacuum performance index requirements is realized.

The invention belongs to the technical field of integrated photoelectronics, and discloses a phase change photosynaptic device array and a preparation method thereof. The synaptic device array is of a cross array structure formed by a plurality of phase-change optical synaptic cells through directional couplers with the same number, an arc waveguide in each phase-change optical synaptic cell comprises a phase-change waveguide section, a heating layer is arranged above a phase-change material layer, and an isolating layer is arranged between a metal electrode and the waveguide. According to the synaptic device array, current joule heat generated by the heating layer under the action of electric pulses is transmitted to the phase-change material layer, so that the state of the phase-change material layer is changed, meanwhile, the isolation layer is used for shielding absorption and interference of the metal electrode on optical signals in the waveguide, and the optical loss of the array is reduced; therefore, the problem of heating structure integration of the phase-change photosynaptic device array can be effectively solved, and effective modulation of the phase-change photosynaptic device array is realized.

The invention relates to a construction method of a photon neural network, an image processing method, equipment and a medium, and the construction method comprises the steps: forming a silicon waveguide on a silicon-based substrate, periodically arranging phase change units on the surface of the silicon waveguide to form a two-dimensional array, and constructing a phase change metasurface with a beam splitting function by regulating and controlling the state of the phase change units. An input port and an output port are connected through a tapered waveguide to form an optical power beam splitter; output optical signals pass through a crossed waveguide and a directional coupler and are arranged according to a convolution kernel matrix structure, and a photon convolution kernel is constructed. A multi-wavelength laser source, an optical modulator and a photoelectric detector are integrated, the state of a phase change unit is dynamically regulated and controlled, and a photon neural network is established. And after matrix operation, the optical signal is converted into an electric signal by the photoelectric detector and is output to the processing module, so that the network performance is remarkably improved, and an efficient and low-energy-consumption scheme is provided for deep learning.

A measurement system includes a common port, the common port being connectable to a signal output of the device under test. The measurement system further includes a signal line being connected to the common port, wherein the signal line includes a first directional coupler portion and a second directional coupler portion. The measurement system further includes a signal processing circuit, wherein the signal processing circuit includes an IQ analysis circuit and an IQ synthesizer circuit. The IQ analysis circuit is connected with the common port via the first directional coupler portion so as to receive a forward-travelling signal from the common port. Further, a testing method of testing a device under test is described.

Example directional couplers and devices including one or more directional couplers are disclosed. In an example, a directional coupler comprises a first electrically conductive portion and a second electrically conductive portion, a first ground plane electrical conductor disposed in a plane between the first electrically conductive portion and the second electrically conductive portion, and a second ground plane electrical conductor and a third ground plane electrical conductor disposed such that the first and second electrically conductive portions and the first ground plane electrical conductor are between the second and third ground plane electrical conductors. The first ground plane electrical conductor includes at least one hole directly between the first electrically conductive portion and the second electrically conductive portion.

The invention discloses a broadband dual-circularly-polarized low-cost phased-array antenna array element, which comprises an antenna radiation structure and a slot feed structure which are arranged independently from each other, and is characterized in that the antenna radiation structure comprises a parasitic radiation layer, a first dielectric substrate, an excitation radiation layer and a second dielectric substrate which are arranged in a laminated manner; the slot feed structure comprises a slot layer, a third dielectric substrate, a strip-shaped transmission line and a fourth dielectric substrate; the antenna layer structure and the slot feed structure realize electromagnetic coupling transmission through the slot layer; a hollow symmetrical structure is arranged in the middle of the first dielectric substrate, and the hollow part is used as an air medium to reduce dielectric loss; the gap layer is provided with a multidirectional coupling gap structure; the strip-shaped transmission line is provided with at least two feed ports, and dual circularly polarized radiation is formed in the antenna layer structure through excitation of different feed ports. The antenna radiation layer has no metal through hole or blind hole, can be processed in a layered manner, has the advantages of low processing cost and high yield, and ensures impedance bandwidth while realizing dual circular polarization.

The invention discloses a high-performance dynamic routing circuit for improving S parameter measurement and a multi-port expansion box, and relates to an S parameter test and port expansion technology. The routing circuit applied to the transmitting path comprises four output ends, six transmitting branch port input ends, a transmitting total port input end, four first-stage equalization amplifiers, two first-stage one-to-two switches, two second-stage equalization amplifiers, four first-stage one-to-three switches, a first-stage one-to-four switch and a third-stage equalization amplifier. The internal paths of the circuit are symmetrical, and the transmission path length of signal routing gating is minimized through the arrangement of a total port and branch ports, so that high performance is ensured. The multi-port expansion box comprises a routing circuit applied to a transmitting path, a routing circuit applied to a reference / test receiving path, a transmitting / reference receiving / test receiving standard configuration routing amplification unit, a bi-directional coupler matrix and the like. Port expansion can be flexibly configured and high performance can be ensured.

The embodiment of the invention provides a radio frequency circuit and electronic equipment, and the radio frequency circuit comprises a radio frequency signal link which is connected with an antenna end and is used for transmitting a radio frequency signal of a radio frequency input end to the antenna end or receiving the radio frequency signal from the antenna end; the bi-directional coupler performs forward power detection and reverse power detection on the radio frequency signal on the radio frequency signal link to generate a forward power value and a reverse power value; the VSWR calculation network circuit is used for calculating a ratio between the forward power value and the reverse power value to obtain a power ratio; outputting a protection control signal based on the power ratio and a preset VSWR threshold value; the power limiting network control circuit receives the protection control signal and outputs a pull-down control signal based on the protection control signal; a plurality of power limiting networks, wherein each power limiting network is connected with the radio frequency signal link; and the power limiting networks are used for receiving the corresponding pull-down control signals and carrying out power pull-down on the radio frequency signals in the radio frequency signal link based on the pull-down control signals.

The invention provides a heterogeneous integrated sub-wavelength structure end face coupler adaptive to a single-mode optical fiber and a preparation method of the heterogeneous integrated sub-wavelength structure end face coupler, and relates to the technical field of integrated optics. The coupler comprises a substrate, an insulating layer, a waveguide layer and a cladding from bottom to top. The waveguide layer comprises an upper lithium niobate ridge waveguide and a lower lithium niobate ridge waveguide, the lower waveguide is wider than the upper waveguide, and the upper waveguide is used for connecting an external waveguide; the heterogeneous integrated coupling region comprises a silicon nitride strip conical waveguide which forms directional coupling with the lower-layer lithium niobate waveguide, so that adiabatic transfer of a light field is realized; the sub-wavelength grating regulation and control region sequentially comprises a silicon nitride tapered waveguide and sub-wavelength grating combination section, a width gradually-changing grating section and an equal-width buffer grating section. The whole structure is symmetrical about the central axis. Through the multi-section adiabatic transformation and heterogeneous integration design, efficient expansion of a mode field is achieved, the coupling efficiency with a single-mode fiber is improved, and the advantages of being insensitive to polarization, good in process compatibility and suitable for high-density integration are achieved.

The invention relates to a terahertz high-power power amplifier assembly, which belongs to the field of electronic devices and comprises a synthesis network consisting of a synthesis network upper cavity and a synthesis network lower cavity, and a small signal amplification module, a medium-power amplification module, a driving-stage power amplifier module, a final-stage power amplifier module and a detection module are arranged on the back surface of the synthesis network lower cavity. An E-plane waveguide directional coupler is arranged in the synthesis network, the small signal amplification module, the medium-power amplification module, the driving-stage power amplification module, the final-stage power amplification module and the E-plane waveguide directional coupler are electrically connected in sequence, and a port of the E-plane waveguide directional coupler is electrically connected with the detection module; a waveguide tube is arranged in the installation position of each module in the synthesis network, and the modules are electrically connected through the waveguide tubes. According to the invention, each stage of amplifier is modularly designed, so that the isolation degree among devices of a link can be increased, and the self-excitation risk caused by space radiation is reduced. And the testability of a single module is improved, and the troubleshooting cost and time are reduced.

The embodiment of the present application provides a high-frequency communication terminal performance detection system and related methods. By introducing two independently operable signal test paths, a base station simulator, a carrier coupler, a directional coupler and a first power meter form a signal test path; a base station simulator, a 5G millimeter wave coupler, a 5G millimeter wave receiving antenna and a first power meter form another signal test path. The two test paths can independently perform signal tests, and the upper host control machine summarizes and analyzes the real-time power measurement results of the 5G millimeter wave uplink signal and the real-time power measurement results of the LTE uplink signal, and generates a relevant performance test report. The performance test report records the average time power of the millimeter wave uplink signal and the average time power of the LTE uplink signal corresponding to the high-frequency communication terminal under test. The above architecture has high scalability and configuration flexibility, and can be used to effectively and reliably detect the high-frequency time average power of the uplink signal of the communication terminal.

The invention discloses a self-detection method, a radio frequency system, a radio frequency device and a storage medium, and belongs to the technical field of radio frequency. In the process that the radio frequency link outputs the radio frequency signal, the test channel is controlled to be conducted, and the directional coupler is controlled to be disconnected from the power detector, so that radio frequency power calibration is carried out through the programmable gain amplifier, the power detector and the digital logic control circuit; or, the test channel is controlled to be disconnected, and the directional coupler and the power detector are controlled to be connected, so that standing wave alarm processing is carried out. By controlling the connection and disconnection of the test channel and the directional coupler with the power detector, the purposes of power calibration in a power-on or transmitting power gap, real-time echo monitoring and standing wave alarm can be achieved.

The utility model provides an anti-unmanned aerial vehicle antenna structure, which comprises an antenna housing, a reflecting plate, a plurality of radio frequency cable joints arranged in the antenna housing, a feed network, an antenna half-wave oscillator, a power divider, a coupler, a directional coupler, a directional antenna system, a control system and a power supply unit, wherein a plurality of radio frequency cable probes are connected with the antenna half-wave oscillator; comprising a 868MHz / 915MHz radio frequency cable joint, a 1.5 GHz radio frequency cable joint, a + 2.4 GHz radio frequency cable joint, a-2.4 Ghz radio frequency cable joint, a 5.8 GHz radio frequency cable joint and a 533MHz-6000 MHz radio frequency cable joint. The antenna half-wave oscillator comprises a T-shaped antenna, a symmetrical antenna, a ceramic antenna and an aluminum plate antenna; the power divider is connected with the symmetrical antenna; the coupler is connected with the T-shaped antenna; the directional coupler is connected with the ceramic antenna; the directional antenna system is connected with the control system. The antenna provided by the utility model is smaller in structure, improves the interference precision, reduces the energy consumption, enhances the anti-interference capability, and is higher in antenna gain.

The invention discloses a radio frequency signal control device and method and related equipment, and relates to the technical field of radiotherapy, and the device comprises a main control module which is used for the execution of radio frequency signal control logic, and is used for collecting the signal of a radio frequency cavity and the incident power and reflection power of a directional coupler in real time, and feeding back the power to the main control module, the signal of the radio frequency cavity comprises D box power; the phase detection module is used for detecting the phase error of the incident power and the D box power in real time and generating an oscillation driving signal during phase matching; the amplification module is used for amplifying the oscillation driving signal; and the base signal generation module is used for generating a radio frequency base signal according to the received oscillation driving signal so as to realize closed-loop control of a radio frequency signal of the synchrocyclotron and realize stable and efficient acceleration of a proton beam in the synchrocyclotron system.

The invention relates to a level control system and method for radio frequency signal output power, belongs to the technical field of signal processing, and solves the problem that an existing power compensation algorithm is complex and unstable. In the system, a radio frequency amplifier is used for performing power amplification on a radio frequency signal input according to set power; the electric control attenuator is used for adjusting the power of the input radio frequency signal according to the control voltage output by the feedback circuit; the directional coupler is used for outputting a radio frequency signal after power regulation through the straight-through port, and inputting the radio frequency signal to the first microwave detector to obtain output power; coupling the radio frequency signal after power regulation to a feedback circuit through a coupling port; a digital PID control module in the feedback circuit is used for acquiring an analog control voltage according to a radio frequency signal, and a feed-forward control module is used for acquiring a feed-forward control voltage according to power pre-amplitude-stabilizing data corresponding to set power; and the analog control voltage and the feed-forward control voltage are added to obtain a control voltage output by the feedback circuit. And the output power can be quickly and stably adjusted.

The invention provides a polarization insensitive 2 * 2 Mach-Zehnder optical switch based on a silicon nitride waveguide device. The silicon nitride waveguide layer comprises two optical input waveguides, two 2 * 2 bent waveguide type 3dB directional couplers, two symmetric Mach-Zehnder interference (MZI) arms and two optical output waveguides; two light input waveguides are respectively coupled with two input ports of a first 2 * 2 3dB directional coupler, through two paths of symmetrical MZI arms, a straight waveguide of one MZI arm is attached with a thermode to carry out optical signal phase modulation, output light of the two paths of MZI arms is input to a second 2 * 2 3dB directional coupler, so that the output light of the two paths of MZI arms is combined and interfered, and the output light of the two paths of MZI arms is output to the second 2 * 2 3dB directional coupler. And two paths of output waveguides are respectively led out. Based on the silicon nitride square waveguide and the 2 * 2 bent waveguide type 3dB directional coupler, the directional coupler has the advantages of being insensitive to polarization, large in bandwidth, low in insertion loss, high in extinction ratio and the like.

The invention discloses a high-symmetry dynamic routing circuit supporting S parameter measurement multi-port extension, belongs to the technical field of electronic measurement and microwave radio frequency testing, and relates to port extension of a vector network analyzer and performance testing of a complex network system. Comprising an emission dynamic route amplification module, N emission standard configuration route amplification units, a reference receiving dynamic route amplification module, N reference receiving standard configuration route amplification units, a measurement receiving dynamic route amplification module, N measurement receiving standard configuration route amplification units and a bi-directional coupler matrix. N is an even number; the bi-directional coupler matrix comprises a plurality of bi-directional couplers, and the number of the bi-directional couplers is consistent with that of the external test ports. According to the scheme, exponential expansion of the ports can be realized without changing hardware or adding modules so as to adapt to different application scenes such as change of the number of the ports of the vector network analyzer or adjustment of the number of the expanded ports, the signal path can always keep high symmetry, and amplitude and phase consistency can meet relatively strict measurement requirements.

A radio frequency conduction test method and a test system are provided. The test method includes: moving a radio frequency test probe to a first pad of a board so as to allow a test signal on the first pad to be transmitted to the radio frequency test probe and then transmitted to a radio frequency test instrument for a radio frequency conduction test, where the test signal in the radio frequency test probe is transmitted to the radio frequency test instrument via an impedance conversion apparatus and a directional coupler, a straight-through output port of the directional coupler is connected to a first measurement port of the radio frequency test instrument, and a coupling output port of the directional coupler is connected to a second measurement port of the radio frequency test instrument.

The invention relates to a phase shift Bragg grating structure wavelength division multiplexer based on a barium titanate platform, and belongs to the technical field of optoelectronic integration. The device comprises a directional coupler, a multi-mode power divider, an unequal-width waveguide and a phase-shift Bragg grating, and pi / 2 phase difference is introduced to an upper arm and a lower arm through the unequal-width waveguide, so that reflected light of the phase-shift Bragg grating is converted into a TEmode; coupling the reflected TEmode to a subordinate device by using a directional coupler, and outputting transmission light in the TEmode; the transmission / reflection wavelength (the single-channel bandwidth is 0.5 nm) is changed by adjusting the grating period, and more than 10 multiplexing channels can be expanded through cascade connection. The limitation that a traditional phase shift grating only transmits output is broken through, a reflecting end multiplexing function is added, TE / TE dual-mode operation is supported, and the phase shift grating has the advantages of independent and controllable channels, low loss and flexible and adjustable wavelength, is suitable for optical communication, optical calculation and high-density optical interconnection systems, and is compatible with various material platforms such as barium titanate, lithium niobate and SOI (Silicon On Insulator).

The invention provides a low-power-consumption passive indoor distribution state monitoring method and system, the method is applied to the system, the system comprises a low-power-consumption passive indoor distribution state monitoring device and a background, and the device and an indoor distribution antenna in a DAS system are correspondingly arranged; the device comprises a directional coupler, a filter, a signal conversion module, a state monitoring module, a communication module and a controller. A first transmission line of the directional coupler is connected in series in a feeder line of an indoor distribution antenna. In the method, the directional coupler collects a radio frequency power signal of the indoor distribution antenna and converts the radio frequency power signal into a voltage signal through a filter and a signal conversion module; and if a preset wake-up condition is met, the controller wakes up the state monitoring module and the communication module, acquires a voltage signal to determine an abnormal detection result of the indoor distribution antenna, determines state detection information of the indoor distribution antenna and uploads the state detection information to a background, and the background determines a power detection result of the DAS system, so that antenna device-level fault monitoring and long-time standby are realized.

Provided is a radio transmitter test system that enables accurate measurement of reflected wave power of an antenna. A radio transmitter test system includes: a power amplifier that amplifies power of a high-frequency signal from a signal generator; a simulative antenna for which a voltage standing wave ratio is variable and that is connected to a coaxial cable in place of an antenna; a directional coupler that is connected between the power amplifier and the simulative antenna, couples the high-frequency signal to the simulative antenna, and outputs traveling wave power and reflected wave power between the power amplifier and the simulative antenna; a power meter connected downstream of the directional coupler; and a control device, wherein the control device calculates, for each voltage standing wave ratio of the simulative antenna, a correlation coefficient indicating a correlation between traveling wave power and reflected wave power of the simulative antenna and traveling wave power and reflected wave power measured by the power meter, and calculates reflected wave power of the antenna by correcting, with the correlation coefficient, the traveling wave power and the reflected wave power measured by the power meter in a state where the simulative antenna is replaced by the antenna.

The invention belongs to the field of on-chip lithium niobate film optical waveguide devices, and provides a directional coupling type on-chip polarization structure based on a lithium niobate film, which comprises a silicon substrate, a silicon dioxide substrate, a lithium niobate rectangular waveguide and a silicon dioxide buffer layer which are sequentially stacked from bottom to top. The lithium niobate rectangular waveguide comprises a main waveguide and a polarizing waveguide. According to the coupling type on-chip polarization structure, for light beams input into the optical waveguide, the TM mode can be transmitted, the TE mode can be cut off, the coupling type on-chip polarization structure can serve as the input end of a lithium niobate film optical waveguide electro-optical modulator or an electric field sensor, and waveguide single-mode single-polarization transmission is achieved.