133 results about "Standing wave ratio" patented technology

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, 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.

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 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 utility model discloses an improved medium-wave multi-order deploying network, which belongs to an antenna deploying facility and comprises a first-order tuning unit and a second-order tuning unit. The first-order tuning unit comprises a first inductance coil and a second inductance coil which are connected in parallel and grounded, the second tuning unit comprises a third inductance coil and a fourth inductance coil, the first-order tuning unit and the second-order tuning unit are designed in the network, the broadcast frequency working bandwidth can be widened, and when the standing-wave ratio is smaller than or equal to 1.2, the frequency of the broadcast frequency can be increased. And the debugging bandwidth is 3 times of the bandwidth of the traditional inverted L-shaped, T-shaped or pi-shaped single-loop deploying network, and the broadcasting requirement of the future technical development of medium waves can be met.

This invention provides an automatic tuner for a loop antenna used in shortwave communication, belonging to the field of shortwave communication technology. This tuner aims to solve the problems of existing automatic tuners for loop antennas, such as difficulty in balancing versatility and high power performance, and poor high-voltage withstand capability. The tuner includes: a matching circuit, which includes couplers for shunting forward and reverse radio frequency signals; a tuning actuator, which includes an oil-immersed variable capacitor and a drive mechanism; and a main control circuit. Based on the signal shunted by the coupler, the main control circuit autonomously calculates the standing wave ratio (VSWR) and generates a control signal to control the matching circuit and tuning actuator independently of the radio transceiver, thus completing automatic tuning. This invention improves voltage withstand and power handling capability by using an oil-immersed variable capacitor, and achieves universal tuning through the autonomous control of the main control circuit, overcoming the shortcomings of existing technologies and offering the advantages of high power, high reliability, and strong versatility.

The invention discloses a method and equipment for improving matching of a measured piece in an attenuation measurement system, belongs to the field of radio metering, and comprises the method for improving matching of the measured piece in the attenuation measurement system, and the core of the method is that a precise matching absorption load is added in a front-end transmission system of the measured piece; energy transmission is realized on a waveguide wide side of the precise matching absorption load through a coupling hole; a transmission waveguide is additionally arranged above the coupling hole, and energy is transmitted to a measured piece in the forward direction; and a precise matching absorption load is added in the reverse direction to absorb energy in the reverse direction, so that the measured piece matching improvement equipment in the attenuation measurement system is formed, and finally the measured piece matching of the attenuation measurement system is improved. According to the method and the equipment, the impedance matching of the measured piece is improved by using the precise matching load, the voltage standing-wave ratio of the load level is realized, and the attenuation measurement accuracy is improved. The tested piece matching improvement equipment developed by using the method is directly connected to two ends of the tested piece in an attenuation measurement system, so that the impedance matching of the tested piece is improved.

This invention provides an output impedance calculation device, which includes: a control unit, an adjustment unit, a LORA transmitting unit, a first impedance calculation unit, a second impedance calculation unit, a matching unit, and a transmitting antenna. The control unit is used to transmit wireless signals; the LORA transmitting unit is used to convert wireless signals into LORA signals; the first impedance calculation unit is used to calculate the input impedance based on the LORA signals; the second impedance calculation unit is used to calculate the output impedance based on the LORA signals; the control unit is used to calculate the reflection coefficient based on the input and output impedances, and to calculate the standing wave ratio based on the transmission coefficient; the adjustment unit is used to adjust the impedance in the circuit based on the standing wave ratio and the reflection coefficient, thereby achieving impedance matching and balance between the input and output terminals of the line, improving the output quality of radio signals, reducing the overall output power consumption, and reducing harmonic interference.

The invention discloses a multi-frequency antenna radiation unit device with a decoupling function, and belongs to the field of mobile communication antennas. The high-frequency radiation unit comprises a balun electrically connected with the reflecting plate and a radiation arm connected to the balun; the low-frequency radiation unit is positioned on the periphery of the high-frequency radiation unit and is arranged on the reflecting plate; the capacitor loading assembly comprises a coupling patch connected with the radiation arm and a capacitor branch connected to the balun, the capacitor branch is located on the side, close to the reflecting plate, of the balun, the coupling patch and the capacitor branch form an additional capacitor connected with the high-frequency radiation unit in parallel, and the total equivalent capacitance of the high-frequency radiation unit is changed through the additional capacitor; therefore, the resonant frequency of the high-frequency radiation unit is shifted out of the low-frequency working frequency band, common-mode resonance generated when the high-frequency radiation unit and the low-frequency radiation unit are adjacently arranged is eliminated, the standing-wave ratio of a low-frequency port is improved, the working bandwidth is widened, distortion of a low-frequency radiation pattern is eliminated, and the coverage quality of a base station is guaranteed.

The invention relates to a DMS type filter and a filtering device, the DMS type filter comprises reflecting gratings and a plurality of IDTs arranged between the reflecting gratings, and each IDT is arranged along the propagation direction of surface acoustic waves; each IDT comprises a plurality of spacing intervals, and each spacing interval is provided with interdigitals which are arranged along the propagation direction of the surface acoustic wave and are sequentially connected end to end; wherein each IDT comprises a main spacing area and a plurality of spacing adjusting areas, the spacing of the interdigitals in the main spacing area is consistent, the spacing of the adjacent interdigitals in each spacing adjusting area monotonically changes in the form of a quadratic power function along the direction far away from the main spacing area, and the variation amplitudes of the spacing of the adjacent interdigitals in different spacing adjusting areas are different. By adjusting the distance between the interdigitals one by one, the design freedom degree is remarkably improved, and therefore the purposes of reducing insertion loss, improving the standing-wave ratio, expanding the bandwidth and the like are achieved so as to adapt to different use scenes, and the application range is widened.

The utility model belongs to the technical field of communication equipment, and particularly relates to a frequency division dual-channel filter, which comprises a cavity cover plate, a device cavity, a connector and a mounting bracket, the device cavity is of a hollow cuboid structure, and an opening is formed in the upper end face of the device cavity. The cavity cover plate is of a flat-plate-shaped structure matched with the opening and fixedly covers the opening in the upper end of the device cavity through evenly-distributed installation screws, and a sealed cavity is formed. According to the utility model, the large cavity design is adopted, and the insertion loss and standing-wave ratio index of a product are effectively improved, so that the transmission quality of communication signals is improved; two input ports and two output ports are arranged, so that when the device is connected with a dual-port device, the device can be connected through a jumper wire; the installation support is additionally designed, so that the product can be installed on a cabling rack, a cabinet or a platform, and installation and maintenance are convenient.

The invention belongs to the technical field of low-altitude radar antenna gain, and discloses a low-altitude surveillance radar X-band antenna gain estimation method and system, and the method comprises the steps: collecting the phase distribution of a radiation unit, the standing-wave ratio of a feed network and other microscopic parameters, and building a correlation model of the microscopic parameters with a mesoscopic multipath signal and macroscopic scene complexity; a transition area correction factor iterator is introduced, temperature compensation, frequency compensation and a multi-level loss correction process are combined, and errors of temperature drift and frequency deviation of the 10-12 GHz frequency band are counteracted; the accuracy of gain estimation in a complex low-altitude environment is improved; constructing a three-dimensional adaptive matrix of the RCS, the maneuvering acceleration and the target type, and forming a three-dimensional correction system in combination with the environment complexity dimension; in a multi-target scene, computing resources are distributed according to the logic that the smaller the RCS is, the larger the maneuvering acceleration is and the higher the priority is, the targets are processed in batches by adopting a time division multiplexing architecture, and the contradiction between the gain response lag of the X-band antenna and the fast maneuvering of the targets is relieved.

The invention provides a radio frequency microwave power amplifier over-standing wave protection system and a protection method thereof. The system comprises a bidirectional coupling module, a dual-path detection module, a signal processing module and a protection execution module, wherein the bidirectional coupling module is used for collecting a forward radio frequency power analog signal and a reverse radio frequency power analog signal; the dual-path detection module is used for generating a forward detection voltage analog signal based on the forward radio frequency power analog signal and generating a reverse detection voltage analog signal based on the reverse radio frequency power analog signal; the signal processing module is used for generating an actual standing-wave ratio based on the forward detection voltage analog signal and the reverse detection voltage analog signal, and generating a control protection signal according to the actual standing-wave ratio; and the protection execution module is used for performing power-off protection on the to-be-protected radio frequency microwave power amplifier based on the control protection signal. The problem that an existing radio frequency microwave power amplifier over standing wave protection scheme cannot be suitable for complex application scenes can be solved.

The application discloses a kind of through type radio frequency microwave vector analysis device and method, device includes radio frequency front end and down conversion module, digital acquisition and processing module and control and interactive module.Radio frequency front end and down conversion module are used for the transmission of radio frequency signal, two-way coupling sampling and coherent down conversion;Digital acquisition and processing module are used for collecting signal and processing, obtain pure incident wave signal and reflected wave signal;Control and interactive module are used for controlling each module, and carry out man-machine interaction.The application is realized by using through type measurement architecture, under the premise that the signal transmission of measured system is not interrupted, realizes the online vector analysis of radio frequency signal, and does not need built-in signal source, and then complete vector parameter such as reflection coefficient, impedance, standing wave ratio can be accurately calculated.

The utility model relates to a photovoltaic module which can solve the problems that a communication module in the prior art is low in integration and cannot be produced, popularized and used on a large scale. The photovoltaic module comprises a first cover plate, an antenna structure, a photovoltaic sheet and a second cover plate which are arranged in a stacked mode, a metasurface structure is arranged on the surface of the side, facing the photovoltaic sheet, of the first cover plate, the metasurface structure comprises groove grids distributed periodically, the groove grids are filled with the antenna structure, and the standing-wave ratio of the antenna structure within a preset frequency band is smaller than a preset standing-wave ratio.

The invention relates to the technical field of antennas, in particular to a miniaturized multi-band onboard antenna and a design method thereof. Through an innovative integrated structure of the central main radiator and the asymmetric peripheral parasitic unit, effective coverage of multiple frequency bands and ultra-short wave frequency bands of Beidou No.3 is realized on a single antenna body, two pairs of independent antennas required in a traditional scheme are thoroughly omitted, the equipment space is greatly saved, the weight is reduced, and the cost is reduced. The device is especially suitable for vehicle-mounted, handheld and unmanned aerial vehicle-mounted equipment sensitive to size and weight. Through accurate structural design and optimized electromagnetic coupling, the antenna provided by the invention realizes a good circular polarization characteristic with an axial ratio of less than 3dB at a Beidou B1 frequency point, and ensures stable reception of navigation signals. Meanwhile, in all Beidou working frequency bands and ultra-short wave frequency bands, the voltage standing wave ratio is smaller than 2.5, and it is indicated that the antenna has excellent impedance matching and radiation efficiency in all target frequency bands.

The present disclosure pertains to a power amplifier system that promotes enhanced signal linearity and overall system efficiency. The system includes a power amplifier with an amplification path for a radio frequency (RF) signal, and detector circuitry operationally linked to sample locations along this path. The detector circuitry captures and transmits signal characteristics of the RF signal. A voltage standing wave ratio (VSWR) quadrant data generator in communication with the detector circuitry generates VSWR quadrant data based on the detected signal characteristics. The baseband circuitry, comprised of a memory unit preconfigured with digital pre-distortion (DPD) coefficients and a DPD processor, controls the shaping of pre-distortion applied to the RF signal based on the VSWR data, thereby enhancing signal linearity. The components of the system interconnect and collaboratively function to optimize the performance and efficiency of the power amplifier system.

The invention provides a slope power division directional coupler which comprises a first input port, a second input port, a first output port and a second output port, the first input port is connected with the first output port through a first strip line, the second input port is connected with the second output port through a second strip line, and the first output port is connected with the second output port through a second strip line. Parallel coupling lines are configured on the first strip line and the second strip line, the coupling gaps of the coupling lines of the slope power division directional coupler adopt waveform function curves to replace linear gaps, the working frequency band can be broadened, the standing-wave ratio can be effectively reduced, the isolation degree of the directional coupler of an antenna can be greatly improved, and the antenna performance can be improved. And the high-isolation communication requirement is met. Meanwhile, the power ratio of the two output ports of the slope power division directional coupler has a large slope, the power ratio changes greatly along with the frequency, the horizontal wave width of the antenna can be converged, and the coverage energy efficiency of the antenna is improved.

The invention relates to a rail transit leaky coaxial cable detection method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a radio frequency signal in a leaky coaxial cable, and carrying out the coupling and adjustment of the radio frequency signal, so as to convert the radio frequency power into a voltage signal. And determining a standing-wave ratio and a signal attenuation amount according to the voltage signal, carrying out wavelet threshold noise reduction on the vibration acceleration of each edge node, and generating a data packet in combination with temperature and humidity data. And calling a bidirectional long-short-term memory network of an attention mechanism to calculate a health index corresponding to the data packet, and predicting a health index change trend in a set time period. And comparing the health index and the health index change trend with a set threshold value so as to give an alarm when the set threshold value is not met. According to the invention, the state and the aging reason of the leaky coaxial cable are evaluated from multiple dimensions, the problem that the service life of the leaky coaxial cable is difficult to comprehensively evaluate through single parameter monitoring is solved, the detection precision of the state of the leaky coaxial cable is improved, and the requirements of rail transit for real-time performance and low operation cost can be better met.

The application discloses a high-frequency radar transmitting device and a transmitting control method thereof, and belongs to the technical field of radar transmitters. The high-frequency radar transmitting device comprises a shell and a first transmitter installed in the shell. The first transmitter is used for amplifying input signals. The first transmitter is provided with an acquisition unit, a control unit and an execution unit. The acquisition unit is used for acquiring at least one parameter in power supply voltage, bias voltage, total current, output voltage standing wave ratio and temperature of the first transmitter. The control unit can compare the acquired parameters with corresponding preset ranges. If the value of a certain parameter exceeds the corresponding preset range, the control unit sends a shutdown instruction to the execution unit. The execution unit can shut down the first transmitter according to the received shutdown instruction, and restart the first transmitter according to the received restart instruction after a set time length. The high-frequency radar transmitting device has high automation degree, and ensures the stability and continuity of the high-frequency radar transmitting device.

The utility model discloses a waveguide coaxial converter belongs to communication technical field, including installation flange, converter bottom plate, waveguide cavity, rectangular waveguide, coaxial connector, probe, waveguide cavity one end is installed on converter bottom plate, and the other end is provided with installation flange, be provided with coaxial connector on installation flange, be provided with probe in the coaxial connector of installation flange, and probe is vertically inserted into the coaxial connector, converter bottom plate installs rectangular waveguide, and is provided with installation positioning hole in four around, has solved the technical problem that the impedance mismatch of prior art is caused because of the size tolerance, and the standing wave ratio in broadband is difficult to optimize.

This invention discloses an electrically tuned high-power telescopic antenna system and method for use in an electromagnetic reverberation chamber. The system includes a base unit with a telescopic antenna rod slidably connected to it. The telescopic antenna rod's electrical length can be adjusted by changing its extension length to accommodate resonance requirements at different test frequencies. An electrically driven mechanism is installed within the base unit, with its power output connected to the telescopic antenna rod. The telescopic antenna rod is electrically connected to an RF feed unit for feeding external RF power into the telescopic antenna rod. A position feedback sensor is installed in the base unit. A control unit is optically connected to the electrically driven mechanism and the position feedback sensor, forming a closed-loop control based on the signal from the position feedback sensor. This invention achieves good impedance matching within the 30MHz–80MHz frequency band, solving the problem of severe mismatch in this band with existing antennas. It provides precise tuning, good matching, and ensures that the VSWR meets test requirements across the entire frequency band.

The present invention relates to the field of wireless telecommunication and discloses a compact, high-performance, dual-polarized, quasi-omnidirectional Multiple-Input Multiple-Output (MIMO) antenna system for small cell wireless communications. It develops a flexible platform to realize different arrangements of antenna modules for different applications for 3G, 4G, and 5G wireless systems. It includes multi-band dual-polarized antenna arrays operating at 696 MHz-960 MHz, 1695 MHz-2700 MHz, 3300 MHz-4200 MHZ, 5150 MHz-5925 MHz, high gain antenna array modules, feeding networks, power dividers, reflectors, and a radome. The invention adopts a dual-polarized MIMO antenna structure with multiple radiating antenna arrays with high isolation between radiating elements to achieve compact size, good standing wave ratio, high gain, wide operating frequency range, quasi-omnidirectional antenna pattern, and spatial diversity with less interference. In addition, the antenna structure is fully customizable, highly reliable and durable, easy to manufacture, and easy to deploy in the field.

The invention relates to the technical field of broadcast transmitting equipment, and discloses a high-power radio frequency window lightning arrester which comprises a metal shell which is a hollow cavity made of a conductive material and serves as a grounding reference. The first radio frequency connector and the second radio frequency connector are respectively arranged at two ends of the metal shell; the central conductor penetrates through the interior of the metal shell, and the two ends of the central conductor are electrically connected with the inner conductors of the first radio frequency connector and the second radio frequency connector respectively to form a main transmission path of radio frequency signals; the insulating medium is filled between the central conductor and the metal shell; and a path separation unit. According to the high-power radio-frequency window lightning arrester, the path separation unit is arranged, so that the problem that the insertion loss of a radio-frequency signal is increased and the voltage standing-wave ratio is degraded to influence the transmission of the radio-frequency signal due to impedance mismatch of a main transmission path when a surge discharge path is introduced into an existing high-power radio-frequency window lightning arrester is solved.

A kind of dual-port antenna applied to zero-clearance mobile terminal, including horizontal dielectric plate, both sides of the horizontal dielectric plate are respectively provided with vertical dielectric plate, the inner surface of the vertical dielectric plate is provided with radiator, the two ends of the radiator and located on the upper surface of horizontal dielectric plate are respectively provided with first port feed network and second port feed network, the back of the horizontal dielectric plate is etched with metal floor;The present application adopts multi-port antenna form, two radio frequency ports jointly excite same antenna radiator, and introduce coupling gap on radiator, reduce the size of antenna radiator, integrated antenna pair has lower standing wave ratio, LC series resonance circuit is introduced between the middle position of radiator and metal floor, so that the isolation between two radio frequency ports is kept higher, the antenna of the present application and metal floor have no clearance area, can be applied to zero-clearance mobile terminal equipment, with high isolation characteristic and compact structure characteristics.

The present disclosure relates to the technical field of microwave testing, and provides an apparatus and method for implementing measurement of a source standing wave ratio by using a vector network analyzer. The method comprises: first, setting operating parameters of a vector network analyzer and a signal generator under test, so that a vector network excitation source and the signal generator under test operate at the same frequency, and the vector network analyzer and the signal generator under test share a reference time base; acquiring operating data of the vector network analyzer; when the vector network analyzer operates in a frequency sweep state, enabling, by means of a provided control switch K1, the vector network analyzer to first be connected to a circuit breaker, and then be disconnected from the circuit breaker to be connected to an output terminal of the signal generator under test; and acquiring a measurement signal outputted by a receiver of the vector network analyzer for signal processing, and obtaining a measurement result of a source standing wave ratio. In the present disclosure, the apparatus for testing the source standing wave ratio of a signal source is constructed on the basis of the vector network analyzer, such that automatic frequency sweep testing can be implemented, thereby improving the accuracy and efficiency of measuring the source standing wave ratio of an active device.

The invention discloses a dual-frequency common-caliber phased-array antenna, and relates to the technical field of common-caliber antennae, in the phased-array antenna, a plurality of high-frequency antenna units arranged at equal intervals form a high-frequency antenna array, and the high-frequency antenna array is in one-to-one correspondence with a plurality of first square annular metal sheets of a first frequency selection surface and is nested on the upper surface of a first dielectric layer; the first dielectric layer is stacked above the second dielectric layer, and the low-frequency antenna unit is arranged below the second dielectric layer. An air cavity is formed in the low-frequency antenna unit, the third dielectric layer is arranged in the cavity in parallel, and second square annular metal sheets of the second frequency selection surface correspond to the first square annular metal sheets one to one and are arranged on the upper surface of the third dielectric layer at equal intervals. According to the scheme, the two frequency selection surfaces can reflect high-frequency electromagnetic waves, improve the active standing-wave ratio of the high-frequency antenna and the isolation degree of a pilot frequency port, and can serve as a metamaterial matching layer of the low-frequency antenna to expand the scanning bandwidth of the low-frequency antenna; the stacked structure realizes common-caliber integration of high-frequency and low-frequency antennas, greatly saves space and weight, and adapts to the compact requirement of electronic equipment.

The application discloses an equivalent simulation method of umbilical cable power transmission characteristics, a circuit and a medium, and relates to the technical field of long-distance umbilical cable transmission. The method comprises the following steps: acquiring cable parameters corresponding to a unit length of umbilical cable, and determining effective circuit parameters by skin effect analysis based on the cable parameters; performing transfer update analysis on the effective circuit parameters to obtain a characteristic impedance coefficient; performing cable loss calculation on the cable parameters to determine cable characteristic loss; according to the characteristic impedance coefficient and the cable characteristic loss, performing attenuation trend analysis of long-distance transmission to obtain a standing wave ratio parameter; and performing high-frequency signal attenuation calculation on the cable characteristic loss and the standing wave ratio parameter to determine umbilical cable transmission attenuation data. The application solves the technical problem of insufficient simulation precision of long-distance umbilical cable power signal transmission characteristics in the prior art by the above method, and can accurately predict the power attenuation and high-frequency signal attenuation process of the umbilical cable.

An electronic device may include a voltage standing wave ratio (VSWR) sensor disposed along a radio-frequency transmission line between a signal generator and an antenna. The VSWR sensor may gather VSWR measurements from radio-frequency signals transmitted by the signal generator over the transmission line. Control circuitry may identify a variation in the VSWR measurements over time and may compare the variation to a threshold value to determine whether an external object in the vicinity of the antenna is animate or inanimate. The control circuitry may reduce the maximum transmit power level of the antenna when the external object is animate and may maintain or increase the maximum transmit power level when the external object is inanimate. This may serve to maximize the wireless performance of the electronic device while also ensuring that the device complies with regulatory limits on radio-frequency energy exposure.