337 results about "Standing wave ratio" patented technology

The invention discloses an ultra-wideband low-profile dual-polarization curved surface phased-array antenna, and belongs to the field of antenna engineering technology and wireless communication. The phased-array antenna comprises a plurality of pitching surface sub-arrays which are arranged along the axial direction; the pitching surface subarray is composed of a plurality of curved surface antenna units which are uniformly distributed along the circumference, and the whole pitching surface subarray is fan-shaped; the curved antenna unit comprises a curved dielectric block, a metasurface matching layer, a radiator layer, a vertical feed balun, a wave-absorbing resistance layer and a metal floor layer, wherein the metasurface matching layer and the radiator layer are conformally arranged on the upper surface and the lower surface of the curved dielectric block. According to the antenna, the flexible dielectric plate is used as a carrier of a radiation dipole and is matched with the PCB metal floor, so that the normal active standing-wave ratio of the antenna is smaller than 3.0 in ten octaves in two linear polarization directions of horizontal polarization and vertical polarization, and + / -60-degree scanning is realized in an azimuth plane.

The embodiment of the invention provides a closed-loop control method for power driving and protection, and the method comprises the steps: constructing a voltage feedback type circuit through a high-speed operational amplifier, and forming a closed-loop gain structure through a feedback network of the voltage feedback type circuit; the load current of the output end of the voltage feedback type circuit is monitored in real time, and when the load current exceeds a first set threshold value, a protection mechanism is triggered to turn off the output stage; the power-on surge current is limited through the soft start control circuit; phase information of a load reflection coefficient is obtained, an inductance / capacitance combination of the variable dynamic impedance matching network is selected according to phase information table look-up, inductance / capacitance parameters are switched through a relay, and the transmission standing-wave ratio between the power amplifier and a load is optimized; monitoring the temperature of the radiating fin of the power tube, and dynamically adjusting the resistance value of the feedback network; and performing cooperative control of short-circuit protection, over-temperature protection and surge suppression according to the priority. According to the embodiment of the invention, the performance bottleneck in a load fluctuation scene is broken through.

A system and method for extending and holding aloft a long-wire radio antenna using an unmanned aerial vehicle (UAV), optimizing high-frequency (HF) radio communication where ground-based infrastructure is impractical. The UAV-based system pulls an antenna wire from a reel vertically and hovers in place holding the antenna at a length resonant on the transmitting frequency, enabling effective skip propagation. The system includes mechanisms for precise impedance matching and standing wave ratio (SWR) tuning through automatic adjustments of antenna length, facilitated by onboard sensors and control systems. The antenna wire is connected to a reel anchored to the ground and connected to a wire-mesh ground plane. In one embodiment, the system constantly feeds electric power to the UAV, with filters isolating RF and power currents, enabling both antenna and power transmission functions on the same wire. This system addresses the challenges of maintaining HF communication in remote or disaster-stricken regions.

The invention belongs to the technical field of antenna engineering, and particularly relates to an ultra-wide-band low-profile phased-array antenna, which realizes broadband impedance matching characteristics and effectively expands the working bandwidth of the antenna by optimizing a dipole arm structure and introducing a matching branch knot and linear tapered slot composite structure on a radiation unit layer; on the array architecture level, an electromagnetic metasurface technology is adopted, array current distribution is improved through a periodic artificial electromagnetic structure, the active standing-wave ratio is remarkably reduced, the scanning angle of an array is widened, and meanwhile high compression of a system profile is achieved; on the structural design level, a three-dimensional composite structure of a transverse metal floor, a longitudinal radiation layer and a transverse metasurface layer is innovatively constructed, and the overall section height is reduced to 0.137 lambda Low (lambda Low is the lowest working frequency wavelength) through electromagnetic coupling and space folding technologies; in conclusion, the ultra wide band (the relative bandwidth is greater than or equal to 90%) and the low profile (lt; and the method is suitable for a new generation of broadband phased array radar system.

The invention relates to a 5G communication antenna electromagnetic compatibility enhancement method, device and equipment, and belongs to the technical field of wireless communication networks, and the method comprises the steps: collecting frequency band-space electromagnetic intensity data in real time through a distributed sensor network, and constructing a three-dimensional mapping model in combination with base station beam parameters and polarization information; interference frequency band coordinates are screened based on the model, a phase gradient compensation value is calculated by using a polarization mismatch degree, an antenna array is driven to reconstruct a radiation pattern, and polarization orthogonal nulling is formed in an interference area; the port standing-wave ratio is synchronously monitored, closed-loop optimization is triggered, the antenna weight and the polarization direction are dynamically adjusted until indexes converge, and the problems of insufficient dynamic interference suppression precision, polarization mismatch compensation lag and the like in the prior art are solved.

The invention is suitable for the technical field of communication, and particularly relates to a method for detecting mismatched harmonic waves of a power amplifier. The method comprises the steps that a first power detection unit is connected with a coupler through a control unit, the standing-wave ratio of a to-be-detected power amplifier chip is adjusted to be 1: 1 through a tuner, and the power of an input signal of a vector signal generator is adjusted till the target power of the to-be-detected power amplifier chip is reached; the second power detection unit is connected with the coupler through the control unit, the output standing-wave ratio of the to-be-detected power amplifier chip is adjusted to a preset specific value through the tuner, and when the tuner modulates phases at intervals of preset degrees, the harmonic power of the to-be-detected power amplifier chip in each phase is recorded through the second power detection unit. Compared with the prior art, the method can accurately test and evaluate the harmonic wave of the to-be-tested power amplifier chip under the mismatched standing wave condition, thereby evaluating the harmonic wave index of the to-be-tested power amplifier chip.

The invention belongs to the technical field of wireless communication, and particularly relates to a self-repairing radio frequency coaxial cable, a leaky coaxial cable and a manufacturing method thereof. On the basis of meeting the standard of the communication cable, the technical problems of electrical performance deterioration, reliability reduction and service life reduction caused by micro damage of the foaming insulating layer in the use process of the cable are further solved. Tests show that the self-repairing technology provided by the invention is suitable for a mobile communication radio frequency coaxial cable and a leaky coaxial cable (the frequency range is 0.1 GHz-6 GHz). According to the HLRCTYZ-50-22 leaky coaxial cable in the YD / T2491 standard and the HCTAYZ-50-22 radio frequency coaxial cable in the YD / T1092 standard, when the voltage standing wave ratio is smaller than or equal to 1.20 and the characteristic impedance meets 50 + / -2 ohms, the MTBF (average fault-free time) of the leaky coaxial cable and the HCTAYZ-50-22 radio frequency coaxial cable can be improved by 20%-40% compared with that before improvement.

The invention discloses a broadband single-pole double-throw switch MMIC, and belongs to the field of radio frequency / microwave. The switch adopts a symmetrical dual-channel structure, each channel comprises an input end series switch circuit, an output end series switch circuit and two parallel switch branches, channel switching is realized through two complementary control voltages, and impedance matching is carried out between the circuits by adopting microstrip lines. According to the technical scheme, switching tubes, resistors and inductors are utilized to form a circuit network, and a signal transmission path is optimized through the resonance effect of the inductors and switching tube cut-off capacitors in parallel branches in combination with a resistor parallel structure and a microstrip line matching technology. According to the invention, the performance of low insertion loss and high isolation in a broadband is achieved, the voltage standing wave ratio of an off-state output port is reduced, the port matching capability is improved, and an efficient and stable solution is provided for signal routing in a radio frequency system.

The invention discloses an internal-cooling-based high-frequency coupling window for a high-power cyclotron. The internal-cooling-based high-frequency coupling window is characterized in that an air knife structure is arranged at the atmosphere end of the internal-cooling-based high-frequency coupling window; two groups of conductor choke units with different lengths are arranged on two sides of a ceramic chip of the high-frequency coupling window based on internal cooling, and the two groups of conductor choke units with different lengths are equivalent to two groups of inductors and are used for forming a double-filter circuit of the high-frequency coupling window; a ceramic coating film is arranged on one side of the ceramic sheet of the high-frequency coupling window; according to the air knife structure, more heat on the surface of the ceramic chip is taken away through compressed air; on one hand, the filter unit and the conductor choke unit form a filter circuit of a high-frequency coupling window atmosphere end; according to the invention, the air knife structure is ingeniously utilized, and enhanced cooling is carried out on the ceramic wafer of the coupling window structure; the inductance value of the coupling window is adjusted by using the conductor choke unit, the standing-wave ratio coefficient of the coupling window is reduced, the surface temperature of the ceramic chip is reduced, and the risk of explosion of the coupling window is reduced.

A broadband tight-coupling Vivaldi array antenna comprises N + 2 antenna sub-arrays arranged along an H plane, each antenna sub-array is formed by tightly arranging a plurality of tight-coupling Vivaldi antenna units along an E plane, each tight-coupling Vivaldi antenna unit comprises a dielectric substrate, a radiation patch and a metamaterial patch are printed on the upper surface of the dielectric substrate, a feed balun is printed on the lower surface of the dielectric substrate, and the feed balun is arranged on the upper surface of the dielectric substrate. A radio frequency coaxial connector is arranged at the bottom of the dielectric substrate, a needle-shaped inner conductor end of the radio frequency coaxial connector is connected with the feed balun, and a cylindrical outer conductor end of the radio frequency coaxial connector is in contact with the radiation patch; according to the invention, the miniaturization of the Vivaldi antenna array is realized by utilizing the coupling effect between the units, the edge current path is prolonged by introducing the edge piece and the dummy element at the edge of the array, the active standing-wave ratio of the Vivaldi antenna array during angle scanning is improved to a certain extent, and 60-degree beam scanning is realized on the E surface and the H surface; moreover, the antenna is simple in structure, simplifies the design process of the antenna, and is lower in machining difficulty and cost.

A balanced radio frequency power amplifier, a front-end module, and a corresponding electronic device. The balanced radio frequency power amplifier comprises a driving-stage power unit (101, 201), an inter-stage power divider (102, 202), a main path power amplifier (103, 203), an auxiliary path power amplifier (104, 204), a first output matching network (A105, A205), a second output matching network (B106, B206), and an output power combiner (107, 207). A symmetrical balance design is used for the main path power amplifier (103, 203) and the auxiliary path power amplifier (104, 204), so that the impact of the change in the antenna voltage standing wave ratio (VSWR) on the transmission power and the transmitting efficiency is overcome to the greatest extent. Moreover, a 3 dB distributed orthogonal coupler is used for the inter-stage power divider (102, 202) and the output power combiner (107, 207).

The invention discloses a monitoring method and device of an indoor distribution system and electronic equipment. The method comprises the following steps: acquiring standing-wave ratio data of an indoor distribution system; first indoor distribution systems are determined according to the standing-wave ratio data, and the first indoor distribution systems are part of the indoor distribution systems in the abnormal state; user feature data of the first indoor distribution system and a second indoor distribution system are determined, the residual network is trained according to the user feature data, an indoor distribution monitoring model is obtained, and the second indoor distribution system is the indoor distribution system in a normal state in the indoor distribution systems; and monitoring the indoor distribution system through the indoor distribution monitoring model to obtain a monitoring result of the indoor distribution system. According to the invention, the technical problem that the network maintenance efficiency and the user experience are affected due to the fact that the indoor distribution monitoring technology in the related technology is difficult to effectively identify the signal quality reduction caused by the small change of the passive device or the loose connection, and the false alarm or the missing alarm is easily generated especially in the environment of obvious user tidal effect and large index fluctuation is solved.

The invention belongs to the technical field of antennas, and relates to a common-caliber dual-polarization tight coupling array antenna capable of wide-angle scanning, which comprises a low-frequency antenna array surface, a low-frequency vertical branch knot, a low-frequency feed balun, a high-frequency antenna array surface, a low-frequency feed network and a coaxial connector. According to the invention, a traditional ultra-wideband tight coupling array antenna is decomposed into two antennas with small bandwidths, and loading of resistive materials is avoided through common-caliber configuration. Wherein an upper-layer low-frequency antenna unit is divided into a plurality of sub-units, electromagnetic transparency of a lower-layer high-frequency antenna is realized by adopting a winding line design, mutual interference of high and low frequencies is further inhibited by loading a vertical branch knot, and the fractal low-frequency sub-units are synthesized into a large unit through a power divider. According to the dual-polarization ultra-wideband antenna, the average efficiency reaches 85% in the working frequency bands of 2-6GHz and 7-18GHz, the active standing-wave ratio is smaller than 4 in the scanning range of + / -60 degrees, and the problem that in a traditional design, ultra-wideband, high efficiency, wide-angle scanning and dual polarization cannot be achieved at the same time is solved.

The invention belongs to the field of antenna quality detection, relates to a data analysis technology, is used for solving the problem that the electrical parameter performance of an antenna cannot be tested and analyzed in the prior art, and particularly relates to a dual-notch ultra-wideband antenna quality detection method and system. Comprising an electrical parameter test module, an environment adaptation test module and a comprehensive evaluation module which are connected in sequence, and the environment adaptation test module is further in communication connection with an adaptation optimization module; the electrical parameter test module is used for testing and analyzing electrical parameters of the antenna; the antenna is marked as a test object, and the test object is marked as an electrical parameter normal object or an electrical parameter abnormal object through a voltage standing wave ratio; according to the invention, the environmental adaptability of the antenna can be tested and analyzed, the electrical parameter performance of the single antenna is verified again according to the generated test environment, and the environmental adaptability of the batch of antennas is evaluated according to the proportion of the number of adaptive qualified objects in the verification result. And triggering adaptive optimization analysis when the environmental adaptability is abnormal.

The invention belongs to the technical field of electronic information, and discloses a millimeter wave magnetic coupling variable resonant equalizer, which comprises a transmission waveguide channel, a coupling channel and a resonant cavity which are communicated, the resonant cavity and the coupling channel are arranged in the narrow side direction of the transmission waveguide channel, the opening direction of the coupling channel is parallel to the direction component of an electric field, and the opening direction of the coupling channel is parallel to the direction component of the electric field. The inner walls of the two ends of the resonant cavity are adjustably and slidably connected with adjusting blocks, the opposite inner side faces of the two adjusting blocks are fixedly connected with wave absorbing materials, and the inner wall, facing the coupling channel, of the resonant cavity is detachably and movably connected with a guide block. The center position of the resonant cavity is provided with a telescopic tuning pin perpendicular to the direction component of the magnetic field. According to the structure, the processing and installation problems of a common waveguide equalizer are effectively solved, the equalizer is debugged more simply and quickly, meanwhile, the standing-wave ratio is optimized by changing the cavity structure, and a relatively complex gain curve can be equalized through the good frequency response characteristic.

The invention provides a broadcast antenna ATU input standing-wave ratio automatic adjusting and testing system. A human-computer interface is used for setting a target working program, a working frequency band and initial inductance and capacitance values, and a tuned standing-wave ratio curve and inductance and capacitance values are displayed; the control module decomposes the input initial inductance and capacitance values into rotation turns required by the current motor, transmits the rotation turns to the transmission module, and sends a target working program to the original short-wave antenna system; the transmission module enables the motor to be located at a target position, and correspondingly, target inductance and capacitance values are achieved; the data acquisition module is used for testing the standing-wave ratio of the system, reading the current inductance and capacitance values, recording the maximum value of the standing-wave ratio and sending the maximum value to the data processing module; and the data processing module processes the data and judges whether the current standing-wave ratio meets the requirement or not. According to the method, the automatic test system and the automatic optimization algorithm are combined, so that the workload of debugging personnel is reduced, and the working efficiency of ATU tuning is improved.

The invention relates to the technical field of radio frequency circuits, and provides a protection circuit, method and module of a radio frequency front-end circuit and a radio frequency device.The protection circuit comprises a bidirectional power detection module which is connected in series in a link from a power amplifier of the radio frequency front-end circuit to a radio frequency output end; the comparison trigger module is connected with the bidirectional power detection module; and the power control module is connected with the comparison trigger module and the power amplifier. The bidirectional power detection module detects forward power and reverse power of a link to form a first signal and a second signal, and the comparison trigger module performs comparison processing according to the first signal and the second signal and generates a trigger signal when the output power is too large or the standing-wave ratio is too large. And the power control module adjusts the output power of the power amplifier according to the trigger signal, so that negative effects on circuit elements caused by overlarge output power or overlarge standing-wave ratio are avoided, the circuit elements are protected from being damaged, high-precision protection on the radio frequency front-end circuit is realized, and the safety and the reliability are improved.

The invention relates to a radio frequency coaxial connector with an automatic compensation structure. The radio frequency coaxial connector is used for direct insertion-screwing tool-free field installation of a smooth copper-clad aluminum pipe radio frequency cable. The connector shell is composed of a rear threaded shell body, a middle threaded shell body and a front threaded shell body, a blind hole is formed in the rear portion of the inner conductor, and the core wire can float in the hole to avoid crushing. According to the radio frequency coaxial connector with the automatic compensation structure, the rear portion of the inner conductor is supported by means of the two insulation supports of the insulation assembly, and in the process that the cable core wire is inserted into the insertion hole of the inner conductor, the cable core wire is inserted into the insertion hole of the inner conductor. Impedance can be automatically compensated, so that impedance matching of a product is guaranteed, and the voltage standing-wave ratio is reduced; and the insulation support of the product is not an inverted cone type tightening structure in the prior art, but clamps the cable core wire in a sliding manner, so that the stress of the connector insulator adopting the structure is relatively small, and the situation that the inner conductor cannot tighten the cable due to deformation is avoided.

The invention discloses a rectangular waveguide sealing window structure for realizing broadband transmission, which belongs to a microwave signal detection device and comprises a first rectangular waveguide cavity, a second rectangular waveguide cavity and a rectangular dielectric block arranged between the first rectangular waveguide cavity and the second rectangular waveguide cavity, the first rectangular waveguide cavity comprises a first rectangular waveguide shell and two first stepped transition structures embedded into an inner cavity of the first rectangular waveguide cavity, and the second rectangular waveguide cavity comprises a second rectangular waveguide shell and two second stepped transition structures embedded into the second rectangular waveguide shell. The opposite side faces of the two first stepped transition structures and the two second stepped transition structures are provided with identical tooth-shaped steps, the second rectangular waveguide shell is further internally provided with an installation cavity communicated with the second I-shaped sliding groove, the two waveguide cavities are connected through screws, and the rectangular dielectric block is fixedly installed in the installation cavity. The vertically symmetrical multi-stage stepped impedance matching network provided by the invention realizes excellent transmission performance with low voltage standing-wave ratio in a wide frequency band, and is suitable for a millimeter wave system with high power and wide frequency band.

The invention discloses a radio frequency power amplifier, a radio frequency power amplifier module and a radio frequency power amplifier module, and the radio frequency power amplifier comprises a four-stage power amplifier structure which is used for amplifying an input signal to preset output power; the inter-stage matching network is used for completing impedance matching between the output impedance of each stage of array and the output impedance of the rear-stage array and impedance matching between the input impedance of each stage of array and the output impedance of the front-stage array through an impedance matching technology; the protection circuit comprises a temperature protection unit and a standing-wave ratio protection unit. The temperature protection unit is used for monitoring the temperature of the GaN power amplifier unit in each array in real time and comparing the temperature with a preset temperature, and generating a logic instruction for cutting off the power supply of the corresponding array when the number of overtemperature units is judged to be greater than a preset number; the standing-wave ratio protection unit is used for detecting the output standing-wave ratio and generating a logic instruction for switching power supply when it is judged that the detected standing-wave ratio is larger than a preset ratio. According to the invention, high-performance communication requirements and simple and effective exception protection can be met.

The utility model provides an ultra-wide-band high-performance array antenna, which comprises a plurality of ultra-wide-band oscillator units arranged on a reflecting substrate in an array form, the ultra-wideband oscillator unit comprises a plurality of radiation parts arranged on the dielectric plate at intervals, and the radiation arm of any radiation part and the radiation arm of the adjacent radiation part are collinear to form a dipole; in one radiation piece, any two adjacent radiation arms are perpendicular to each other to form a dual-polarized oscillator; the ultra-wideband oscillator unit further comprises a parasitic branch knot. The parasitic branches are arranged between every two radiation pieces, and the parasitic branches are arranged on the dielectric plate in the horizontal direction and the vertical direction; the radiation part and the parasitic branch knot are coupled and connected to form a frequency expanding structure. According to the utility model, the S parameter of the oscillator unit is optimized by arranging the coupling frequency-broadening structure and the parasitic branch knot, electromagnetic waves are guided through the cooperation of the reflecting strip, the isolating strip and the director, the interference of high frequency to low frequency is reduced, the standing-wave ratio of the antenna is further reduced, and the directivity of the antenna is improved.

The embodiment of the invention is suitable for the technical field of communication, and provides an antenna connection state detection circuit and method, and the detection circuit comprises an adjustable attenuation module which is used for carrying out the power attenuation of a first radio frequency signal and a second radio frequency signal according to an attenuation coefficient, and obtaining a first attenuation signal and a second attenuation signal; the power of the first attenuation signal and the power of the second attenuation signal are both within the power detection range of the detection module; the detection module is used for detecting a first voltage value corresponding to the first attenuation signal and a second voltage value corresponding to the second attenuation signal; and the control module is used for calculating the standing-wave ratio of the signal transmitting module according to the first voltage value, the first power attenuation, the second voltage value and the second power attenuation. According to the detection circuit provided by the embodiment, the application range of the antenna connection state detection method can be expanded, and the accuracy of antenna connection state detection is improved.

The invention, which relates to the technical field of modern communication, discloses a metasurface-based high-gain low-profile dual-circularly polarized antenna comprising a first dielectric plate, a second dielectric plate arranged below the first dielectric plate, and a metasurface structure arranged above the first dielectric plate. Three rows and three columns of periodically arranged metasurface structures are arranged above the first dielectric plate, a multi-level cooperative working mechanism is constructed by combining 45-degree symmetrical composite gaps etched in a layer indirect floor and a microstrip feeder line which is orthogonally arranged on the lower layer, and the metasurface array realizes high-gain radiation by regulating and controlling the phase of electromagnetic waves. The composite slot structure efficiently converts microstrip line energy into an orthogonal degenerate mode through non-contact coupling, circular polarization purity is guaranteed, the axial ratio bandwidth is expanded to 24.2%, an orthogonal microstrip feeder line forms a 90-degree phase difference through accurately controlled size, high isolation and stable standing-wave ratio of double ports are guaranteed, and the antenna has a wide application prospect. And finally, dual-circular-polarization independent radiation is realized in a 5mm low-profile structure.

The invention discloses a fault monitoring method and device for an indoor distribution system, belongs to the technical field of wireless communication, and is used for solving the problems of high cost, poor real-time performance or poor fault judgment accuracy of a related fault monitoring technology for the indoor distribution system. The method comprises the following steps: acquiring network operation data of an indoor distribution system; the network operation data comprises at least one of a standing-wave ratio and a bottom noise value; based on the network operation data and a preset target threshold value, determining whether a first abnormal condition exists in the indoor distribution system; and if it is determined that the indoor distribution system has the first abnormal condition, giving an alarm to a to-be-alarmed object corresponding to the indoor distribution system, so that the to-be-alarmed object corresponding to the indoor distribution system is subjected to fault processing.

The invention provides an optimization method of a surface acoustic wave filter and the surface acoustic wave filter, and the optimization method comprises the following steps: taking the insertion loss of the surface acoustic wave filter as a first optimization target, optimizing a dual-mode surface acoustic wave filter, and obtaining a first optimization result; by taking out-of-band rejection of the surface acoustic wave filter as a second optimization target, optimizing the geometric parameters of the interdigital transducer to obtain a second optimization result; optimizing the capacitance value of the capacitor and the inductance value of the inductor by taking the standing-wave ratio and the ripple of the surface acoustic wave filter as a third optimization target to obtain a third optimization result; and optimizing the surface acoustic wave filter by taking the insertion loss index, the out-of-band rejection index, the standing-wave ratio index and the ripple index of the surface acoustic wave filter as fourth optimization targets to obtain a fourth optimization result. According to the optimization method, the labor cost can be reduced, the probability of falling into a local optimal solution can be reduced, the convergence speed of optimization is improved, and the optimization time is shortened.

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 provides an antenna test method and an antenna test system. The antenna test method comprises the following steps: acquiring test parameters of n to-be-tested products; the test parameters comprise any one of return loss, voltage standing wave ratio and reflection coefficient; determining a feature mean value of the n to-be-tested products based on the test parameters of the n to-be-tested products; determining a feature deviation mean value of the pth to-be-tested product based on the test parameters and the feature mean value of the pth to-be-tested product in the n to-be-tested products; if the characteristic deviation mean value is greater than or equal to a first preset value, determining that the pth to-be-detected product does not meet a preset requirement; n and p are integers, n is greater than or equal to 2, and p is greater than or equal to 1 and less than or equal to n. According to the application, the test parameters of the n to-be-tested products are introduced into the test evaluation of the pth to-be-tested product to obtain the feature deviation mean value of the pth to-be-tested product, so that the accuracy of the test result and the consistency of the to-be-tested products can be improved.

The invention relates to the technical field of noise filtering, in particular to an electronic circuit with a transmission line type noise filter, and the electronic circuit comprises a frequency determination device which is used for determining the working frequency and voltage of the electronic circuit; the device determining device is used for selecting a microstrip line as a transmission line and optimizing the filter by using a composite right / left hand transmission line and an open-circuit T-shaped structure; the impedance matching device is used for matching the impedance of the filter with the impedance of the transmission line; the matching measuring device is used for measuring the impedance matching effect by using a reflection coefficient and a VSWR (Voltage Standing Wave Ratio); and the software simulation device is used for simulating and optimizing the matched filter and transmission line by using simulation software. According to the invention, the impedance of the filter is matched with the impedance of the transmission line, so that the impedance change of the signal in the transmission process is reduced, the reflection of the signal is reduced, and the transmission quality and efficiency of the signal are improved.

The invention relates to the technical field of coupler design, in particular to a bi-directional coupler applied to a high-frequency RFID (Radio Frequency Identification Device) system, which comprises the following steps: S1, respectively constructing a series transformer, a parallel transformer and a Magic-T structure hybrid network, and forming an impedance self-matching coupler core framework by adopting a plurality of Ni-Zn ferrite double-hole magnetic rings; s2, inputting an original coupling signal output by the coupler core architecture into a phase-amplitude cooperative calibration module to generate a calibrated stable coupling signal; s3, inputting the stable coupling signal into a bridging T-type attenuation network group, respectively performing accurate power adjustment on a forward coupling path and a reverse coupling path, and finally outputting a high-directivity and low-fluctuation coupling signal; s4, monitoring the impedance state of an antenna port in real time, and feeding back and adjusting a matching network structure to realize stable control of the standing-wave ratio in a full frequency band range; according to the invention, the design of an external matching circuit is simplified, the coupling efficiency and directivity are improved, and the method has important engineering value.

The invention provides a matching parameter operation circuit and a radio frequency power supply system, the matching parameter operation circuit is used for determining a voltage standing wave ratio when a radio frequency power supply outputs radio frequency electric energy to a load, and the matching parameter operation circuit comprises a first operation unit, a second operation unit and a third operation unit. The first operation unit is used for being connected with the output end of the radio frequency power supply to obtain an output voltage signal and performing first operation according to the output voltage signal and a preset characteristic impedance value to obtain a first operation value. The second operation unit is used for being connected with the input end of the load so as to obtain the input voltage signal and the input current signal, and second operation is carried out according to the input voltage signal and the input current signal so as to obtain a second operation value. And the third operation unit is connected with the first operation unit and the second operation unit and is used for performing third operation according to the first operation value and the second operation value so as to obtain the voltage standing wave ratio. According to the invention, the voltage standing wave ratio can be rapidly and conveniently obtained.