384 results about "Rf technology" patented technology

The invention discloses a warehouse safety management platform and method based on the wireless radio frequency technology, and relates to the technical field of monitoring analysis, and the method comprises the steps: collecting environment sensing data and radio frequency signal data, carrying out the three-dimensional space topology construction of a warehouse, generating a warehouse three-dimensional dynamic environment model, and carrying out the monitoring of the environment sensing data and the radio frequency signal data. Performing correlation analysis on temperature and humidity data in the environment sensing data and warehouse material attributes in the warehouse, generating material abnormal vibration trajectory data, and determining an environment parameter correlation matrix; inputting the environmental parameter incidence matrix and the material abnormal vibration trajectory data into a preset dynamic risk model for security threat probability assessment, generating an equipment abnormal operation characteristic spectrum, and outputting a warehouse regional risk grade distribution diagram; and fusing the warehouse regional risk level distribution diagram and the equipment abnormal operation characteristic spectrum, constructing a potential safety hazard identification optimization model, and pushing the model to a terminal to execute real-time safety early warning and equipment linkage management. The method has the effect of improving the safety management efficiency of the storeroom.

The invention provides an all-digital beamforming transmitter and an all-digital beamforming transmitting method based on a digital radio frequency technology. The all-digital beam forming transmitter provided by the invention comprises a plurality of baseband signal generators, a quadrature modulator, an adder, a 1-bit increment integral modulator, a digital-to-analog converter, a radio frequency front end and an antenna which are connected in sequence, each baseband signal generator is connected with one path of quadrature modulator and one antenna, one path of quadrature modulator comprises a plurality of quadrature modulators, and each baseband signal generator generates a pair of baseband signals; the number of the quadrature modulators in the one-path quadrature modulator is the same as the number of the adders, the number of the 1-bit incremental integral modulators, the number of the digital-to-analog converters, the number of the radio frequency front ends and the number of the antennas; the number of the baseband signal generators is the same as the number of wave beams formed by the antenna, and the number of the baseband signal generators is different from the number of the quadrature modulators in one path of quadrature modulator.

The invention provides a radio frequency module and electronic equipment, and relates to the technical field of radio frequency. The problem that the radio frequency performance of the electronic equipment is reduced due to the influence of antenna isolation is solved. The radio frequency module comprises a first radio frequency channel and a second radio frequency channel, the first radio frequency channel comprises a radio frequency processing device, a filter circuit and a first antenna, the radio frequency processing device is coupled with the first antenna through the filter circuit, and the second radio frequency channel comprises a second antenna. The filter circuit is used for inhibiting the signal transmitted by the second antenna from being transmitted to the radio frequency processing device when the first antenna receives the signal transmitted by the second antenna, or inhibiting the signal transmitted by the second antenna from being transmitted to the radio frequency processing device when the signal transmitted by the second antenna is transmitted to the radio frequency processing device and the signal transmitted by the second antenna distorts to generate harmonic waves. The suppressed harmonics are transmitted from the radio frequency processing device to the first antenna.

The invention discloses a surface acoustic wave resonator, a filter and electronic equipment, and relates to the technical field of radio frequency, compared with an interdigital transducer in an existing surface acoustic wave resonator which is located on the surface, away from a substrate, of a piezoelectric layer, the surface acoustic wave resonator is characterized in that at least part of electrode fingers of the interdigital transducer are embedded into the piezoelectric layer; the depth of the portion, embedded into the piezoelectric layer, of the interdigital transducer is not smaller than 0.02 lambda, and lambda is the wavelength of sound waves transmitted in the surface acoustic wave resonator, so that on one hand, the piezoelectric layer can achieve efficient conversion of electric energy and mechanical energy through the piezoelectric effect, and energy loss is reduced; and on the other hand, the piezoelectric layer and the interdigital transducer are combined more stably, so that stray waves of the surface acoustic wave resonator can be effectively inhibited, in-band stray of the surface acoustic wave resonator is obviously weakened, the Q value of the resonator is further improved, and the performance of the surface acoustic wave resonator is comprehensively improved.

The invention provides a container supervision article verification method based on the radio frequency identification technology, and relates to the technical field of container supervision article verification based on the radio frequency identification technology, and the method comprises the steps: transmitting a wireless signal to a tag on the surface of an article through RFID equipment, and enhancing a received reflection signal through a low-noise amplifier, filtering environmental noise by using a band-pass filter, converting a filtered reflected signal into a time domain signal by using an analog-to-digital converter, and extracting frequency domain characteristics by using FFT (Fast Fourier Transform) so as to calculate a waveform characteristic index; establishing a historical fingerprint template library, storing a waveform characteristic index corresponding to each state, setting a dynamic similarity threshold value based on historical data distribution, screening out templates of which the Euclidean distance is smaller than the threshold value and which belong to the same state as candidates, and if the candidate templates are not empty, selecting the state corresponding to the template of which the Euclidean distance is minimum as a judgment result; and if the candidate template is empty, the state is judged to be abnormal, and container opening alarm is triggered.

The invention provides an ultra-wideband bidirectional active phase shifter based on reconfigurable PPFs, and belongs to the technical field of microwave radio frequency, the bidirectional active phase shifter adopts a symmetrical structure, and comprises two groups of single-ended to differential ultra-wideband Marchand baluns, two two-order reconfigurable PPFs, four bidirectional variable gain amplifiers and a digital control module; wherein the PPF adopts a two-order adjustable resistor and adjustable capacitor structure, the bandwidth can be expanded to realize the ultra wide band, and when the phase shifter carries out steering operation, the impedance is changed due to switching of a switch, so that an error is introduced, and the impedance is adjusted and the error is reduced by adjusting the resistor and the capacitor. According to the phase shifter, the advantages of an active phase shifter and a passive phase shifter are combined, the area can be further reduced while bidirectional phase shifting operation is achieved and the phase shifting precision is guaranteed, and the problems that a traditional active vector synthesis phase shifter can only conduct unidirectional phase shifting operation, and the area of a passive phase shifter is large are solved.

The invention discloses a surface acoustic wave resonator, a filter and electronic equipment, and relates to the technical field of radio frequency, on the basis that at least one of two oppositely arranged bus bars is inclined relative to a main acoustic mode propagation direction to suppress a transverse spurious mode, a silicon dioxide laminated layer is arranged between a substrate and a piezoelectric layer, and the piezoelectric layer is arranged between the substrate and the piezoelectric layer; the silicon dioxide laminated layer comprises at least two silicon dioxide layers, and any two adjacent silicon dioxide layers have different densities, so that any two adjacent silicon dioxide layers with different densities form a sound velocity gradient by utilizing different sound velocities of the silicon dioxide layers with different densities, energy is better limited in the piezoelectric layer, the Q value of the resonator is improved, and the dielectric constant of the resonator is improved. The transverse stray mode of the surface acoustic wave resonator is effectively suppressed, the Q value of the resonator is improved, and the insertion loss of a communication system is reduced.

The invention provides a channel time delay correction method, a radio frequency device and communication equipment, relates to the technical field of radio frequency, and is used for improving the accuracy of channel time delay correction of the radio frequency device. The channel time delay correction method is applied to the radio frequency device, the radio frequency device comprises a control circuit, a transmitting channel and a feedback channel, the control circuit is connected with the transmitting channel and the feedback channel, and the transmitting channel is connected with the feedback channel. The method comprises the steps that a transmitting channel outputs a transmitting signal according to a first signal and a correction sequence; wherein the autocorrelation of the correction sequence is higher than a first threshold value; the feedback channel collects a feedback signal corresponding to the emission signal, and determines the time delay of the emission channel and the feedback channel according to the feedback signal and the correction sequence; and the control circuit performs delay processing on the local oscillator signal and the control parameter of the first signal according to the time delay of the transmitting channel and the feedback channel, so that the accuracy of the channel time delay of the radio frequency device can be improved.

The embodiment of the invention provides a surface acoustic wave resonator, a filter, a radio frequency front-end module and electronic equipment, relates to the technical field of radio frequency, and is used for improving the suppression effect on a miscellaneous mode in the SAW filter. The surface acoustic wave resonator comprises a substrate, and a low-sound-velocity layer, a first high-sound-velocity layer, a piezoelectric layer and an interdigital electrode which are arranged on the same side of the substrate. And the material of the piezoelectric layer comprises LiNbO3 single crystals. The first high-sound-velocity layer is arranged on the side, away from the substrate, of the low-sound-velocity layer, the piezoelectric layer is arranged on the side, away from the substrate, of the first high-sound-velocity layer, and the interdigital electrode is arranged on the side, away from the substrate, of the piezoelectric layer. The first high-sound-velocity layer is arranged between the low-sound-velocity layer and the piezoelectric layer, so that the intensity of a rayleigh mode on the low-frequency side of a main mode in the surface acoustic wave resonator can be effectively inhibited.

The invention discloses an ultrahigh frequency RFID reader-writer digital processing circuit based on RISC-V. The ultrahigh frequency RFID reader-writer digital processing circuit can be applied to the technical field of radio frequency. According to the application, the processing module, the memory module and the ultrahigh frequency read-write data module are arranged, the controller core constructed based on the RISC-V architecture is arranged in the processing module, and then the processing module, the memory module and the ultrahigh frequency read-write data module are tightly coupled, so that the integration level of the reader-writer can be effectively improved; the area of the reader-writer is reduced, then the interaction process of the ultrahigh-frequency read-write data module and the controller core is managed in a coordinated mode through the bus matrix, and after the controller core receives an external control instruction sent by an upper computer, the label data reading process of the ultrahigh-frequency read-write data module is controlled according to the external control instruction. Therefore, the characteristics of the RISC-V architecture can be utilized, the manufacturing cost is reduced, and the area of the reader-writer is further reduced.

The invention discloses a voltage-controlled oscillator with a wide frequency regulation range, relates to the technical field of radio frequency, and aims to solve the problems of narrow and discontinuous output frequency tuning range of an oscillator in the prior art. The voltage-controlled oscillator comprises a passive topology module, an active negative resistance module, a frequency regulation module and a mode switching module, the passive topology module comprises a plurality of mutually coupled inductors; the plurality of inductors are coupled together and provide a required impedance peak; the plurality of inductors comprise a splayed inductance coil, a first annular inductance coil and a second annular inductance coil; the inverted V-shaped inductance coil comprises a first inductance coil, a second inductance coil and a public inductance coil; the frequency adjusting module is used for adjusting the corresponding frequency of the impedance peak; the active negative resistance module is used for providing signal gain for the passive topology module to meet oscillation conditions, and the mode switching module is used for switching working modes of the oscillator. The oscillator has four continuous working frequency bands, and the tuning range of the output frequency is wider.

The present invention relates to the technical field of radio frequency, and disclosed are a clock signal control module and a radio frequency front end module. The clock signal control module comprises an RC oscillating circuit, a random sequence generating circuit, and a control circuit; the RC oscillating circuit comprises capacitors and resistors; an input end of the random sequence generating circuit is connected to an input end of the RC oscillating circuit, and an input end of the control circuit is connected to an output end of the random sequence generating circuit; the random sequence generating circuit is used for generating a random control signal, and the control circuit is used for controlling, on the basis of the received control signal, the capacitance and / or the resistance of the capacitors and / or the resistors connected to the oscillating frequency of the RC oscillating circuit. In the clock signal control module in the present invention, harmonic noise of the clock signal control module at a high frequency band can be averaged, with no periodic spikes, essentially solving the problem of clock harmonic noise.

The invention belongs to the technical field of radio frequency, and provides a bi-directional coupler for a semiconductor and radio frequency power supply test equipment in order to solve the problem that an existing directional coupler is not suitable for the semiconductor. The bi-directional coupler for the conductor comprises a shell, a coaxial conductor, a bi-directional coupling structure and an electrical insulating medium, the coaxial conductor and the bi-directional coupling structure are sealed in the shell; the coaxial conductor is wrapped with the electrical insulation medium; the impedance of the coaxial conductor is equal to that of the semiconductor; the dual-directional coupling structure is attached to the outer side of the electrical insulation medium and coupled with the coaxial conductor, the dual-directional coupling structure is specially applied to the field of semiconductors, the power performance utilization of the directional coupler can be improved, and the cost of the whole device is reduced.

The invention provides a matching parameter determination method and a related device, and relates to the technical field of radio frequency, the matching parameter determination method is used for determining a matching parameter, and the matching parameter comprises a reflection coefficient module value. The matching parameter determination method comprises the following steps: at least obtaining a test current value and a test voltage value of a load when a test AC source outputs a test AC signal to the load; determining a resistance value and an impedance module value of the load at least according to the test current value and the test voltage value; determining a reflection coefficient module value according to the preset characteristic impedance value, the resistance value of the load and the impedance module value; wherein the reflection coefficient module value is used for reflecting the impedance matching condition between the radio frequency power supply and the load when the radio frequency power supply outputs the radio frequency signal to the load. The method can quickly determine the module value of the reflection coefficient.

The invention relates to the technical field of radio frequency, and discloses a differential phase self-calibration single-power-supply variable gain distributed balun circuit which comprises a differential phase calibration module, an ultra-wideband matching gain adjustment module and a distributed balun amplifier core module connected with the differential phase calibration module and the ultra-wideband matching gain adjustment module. On the basis of a traditional differential-to-single-ended distributed balun circuit, the defect that a traditional distributed balun needs multiple sets of power voltages is overcome by only needing one set of power voltages, and meanwhile, the distributed balun circuit provided by the invention also has a digital gain calibration function, so that the balun has a higher degree of freedom in use. In addition, a differential signal self-calibration circuit is further used, and it is guaranteed that the phase error of balun differential input is minimized.

The invention belongs to the technical field of radars, and discloses a radar networking anti-interference method based on a digital array radar software definition multifunctional digital radio frequency technology. Various working modes of conventional radar narrowband and broadband detection, multi-station cooperative detection and anti-interference, external radiation source cooperative detection, single-station / double-station MIMO detection, channelized external electromagnetic environment cognitive reconnaissance, cooperative interference, detection and drying integration, multi-platform communication and the like can be realized at the same time. High-isolation signal frequency diversity is realized by using a wide-narrow band signal receiving and transmitting channelization technology, effective coding isolation diversity is realized by using coding pulses, and multifunctional signal time diversity is realized based on partial function time division multiplexing. According to the method, a set of broadband hardware system with composite functions is reused, electronic functions required by a radar networking system are achieved through different software, the purpose of software definition functions is achieved, and meanwhile the anti-interference capacity of the networking system is enhanced.

The invention relates to the technical field of radio frequency, and discloses a radio frequency device and an assembling method, the radio frequency device comprises a base, a mounting shell is arranged above the base, and radio frequency equipment is mounted in the mounting shell; according to the radio frequency device, the radio frequency signal positioning function of the device can be optimized in the assembling process, the radio frequency signal RSSI can be well calibrated and corrected, the radio frequency device can keep high positioning performance when facing a complex and changeable signal environment, and the reliability of the radio frequency device is improved. The device can regularly and completely clean dust on all parts of the surface of the radio frequency device, so that the adverse effect of the dust on the performance of the radio frequency device is avoided, the communication quality and stability of the radio frequency device are improved, and the device further has a line combing function, can ensure that lines in the radio frequency device are arranged tidily and orderly, and improves the communication quality and stability of the radio frequency device. And the device also has a buffering function, so that when the radio frequency device vibrates, vibration energy can be absorbed and dispersed through damping and buffering treatment, and the service life of the device is prolonged.

The invention discloses an acoustic resonator and a filter, and relates to the technical field of radio frequency, the acoustic resonator comprises a substrate, a coupling adjustment layer, a piezoelectric layer and an interdigital electrode, the material of the piezoelectric layer and the tangential direction of the piezoelectric layer are selected, and the value range of an in-plane Euler angle alpha is set; the piezoelectric coefficient of the piezoelectric layer comprises an e11 component and an e34 component in a piezoelectric coefficient matrix, so that the excited sound wave of the piezoelectric layer at least comprises a longitudinal mode sound wave mainly excited by the e11 component and a high-order shear mode sound wave mainly excited by the e34 component; and a coupling adjustment layer which is made of a proper material and has a proper thickness ratio with the piezoelectric layer is arranged, so that the resonance of the longitudinal mode sound wave and the high-order shear mode sound wave is adjusted to the same frequency, coupling is achieved, and finally the sound wave comprising two coupling modes which are mutually orthogonally polarized in a specific propagation direction is excited. The requirements for high frequency and large bandwidth of centimetric wave communication frequency bands are met, the device is simple in structure, and the preparation complexity and cost of the device can be reduced.

Embodiments provide device for treating sleep apnea, the device including: a stand, a chin and neck support, an applicator integrated into the chin and neck support configured to provide High-Intensity Focused Electromagnetic Technology (HIFEM) therapy and Radio Frequency (RF) therapy, and a control panel configured to adjust an intensity of the delivered HIFEM and RF therapies in real-time. The applicator is configured to provide HIFEM therapy by delivering HIFEM energy to a patient's mouth, throat, and neck to stimulate and strengthen muscles associated with the patient's breathing, and further configured to provide RF therapy by delivering RF energy to reduce fat tissue in the patient's airway.

The invention provides a radio frequency detection circuit and a radio frequency power supply system, and relates to the technical field of radio frequency, and the radio frequency detection circuit comprises a detection unit, a parameter acquisition unit and a processing unit. The detection unit is used for being connected with a transmission path of radio frequency electric energy so as to detect the voltage and current of the transmission path to obtain a voltage detection signal and a current detection signal. The parameter acquisition unit is connected with the detection unit and is used for acquiring a first impedance parameter and a second impedance parameter according to the voltage detection signal and the current detection signal. And the processing unit is connected with the parameter acquisition unit and is used for obtaining the radio frequency parameter of the transmission path at least according to the first impedance parameter and the second impedance parameter. According to the invention, the radio frequency parameter of the transmission path can be rapidly obtained.

The invention provides a gain control method, a storage medium and a radio frequency generator, and the method is applied to the technical field of radio frequency, and comprises the steps: determining a target analog gain control parameter and a target digital gain control parameter according to a target power proportion in a radio frequency output instruction when the radio frequency output instruction is received; and performing digital domain gain modulation based on the target digital gain control parameter and a radio frequency signal parameter in the radio frequency output instruction to obtain a digital radio frequency waveform, converting the digital radio frequency waveform into an analog radio frequency waveform, and performing analog domain gain modulation on the analog radio frequency waveform based on the target analog gain control parameter to obtain a target radio frequency signal.

The present invention belongs to the field of radio frequency technology, and discloses a double-pole four-throw switch driving structure and driving method, including a radio frequency cavity, a driving component, a radio frequency cover plate and a transmission component, two groups of static contacts are arranged in the radio frequency cavity, each group of static contacts includes a first static contact and a second static contact, the first static contact is connected to a connector channel, and the second static contact is connected to a central inner conductor, two groups of moving contacts are arranged at the end of the transmission component, each group of moving contacts includes a first moving contact and a second moving contact, the radio frequency cover plate is arranged on the radio frequency cavity and seals the radio frequency cavity, the driving component is used to generate a lateral displacement output and drive the transmission component to generate a longitudinal displacement output, so as to realize the contact connection between the first moving contact of the corresponding group and the first static contact and the contact connection between the second moving contact and the second static contact. The present invention can greatly compress the overall size of the switch structure in the vertical direction, and greatly meet the use conditions of the switch in a short space.

This invention discloses a signal transmission path optimization method for an integrated RF terminal chip, relating to the field of RF technology. The invention includes: S100 real-time parameter acquisition, calculation of mismatch loss factor, impedance deviation factor, and interference rise factor; S200 weighted fusion of the three factors to obtain a disabling coefficient, constructing a disabling coefficient curve, performing curve feature analysis to generate a reconstruction index, and comparing it with a threshold to determine whether reconstruction is necessary; S300 when reconstruction is required, querying the target control word of the matching network and filter based on a multi-dimensional lookup table, and performing priority correction based on interference and power occupancy; S400 executing control word writing, verifying the effect, and if it does not meet the standard, performing local search and fine-tuning until performance is restored. This invention achieves adaptive optimization of signal transmission paths in multiple frequency bands and scenarios through a closed-loop dynamic reconstruction process of perception, decision-making, execution, and verification, effectively reducing mismatch loss and interference impact, and improving the overall performance of the RF terminal chip.

The present disclosure provides a region-restricted electronic cigarette working circuit, which comprises a monitoring chip, a region sensing module and an atomization switch module. The region sensing module interacts with an external reader / writer through built-in wireless radio frequency tags to identify the boundary of a smoking prohibited area in real time and output an induction signal to the monitoring chip. Based on the received induction signal, the monitoring chip sends on-off instructions to the atomization switch module through an atomization signal control terminal, thereby controlling the on-off of the heating element power supply circuit. This circuit realizes the automatic control of the electronic cigarette use area through wireless radio frequency technology, breaks through the time and space limitations of traditional manual supervision, directly blocks illegal smoking behavior at the hardware level, significantly improves the execution efficiency of public place smoking prohibition regulations, effectively reduces management costs and enhances real-time supervision, and provides technical support for building an intelligent smoking management system.

The present invention relates to the field of radio frequency technology, and specifically relates to a method for updating fuzzy rules, a monitoring system, a device, equipment and a medium. First, the present invention collects the electrical characteristic parameters of the plasma and determines the reference state corresponding to the parameters, and presets fuzzy rules. The fuzzy controller classifies the electrical characteristic parameters through the preset fuzzy rules to obtain classification labels, and then the fuzzy controller outputs the fuzzy state of the plasma according to the classification labels. If the fuzzy state is not the same as or does not match the reference state, then the predicted fuzzy rules are adjusted and updated until the output state is the same as or matches the reference state. At this time, the fuzzy rules are the target fuzzy rules. The fuzzy rules of the present invention are not fixed, but are appropriately adjusted according to the electrical characteristic parameters, so that the fuzzy rules are adapted to the electrical characteristic parameters, and finally the state of the plasma can be accurately determined through the fuzzy rules of the present invention.

The invention discloses a small-sized wide instantaneous bandwidth radio frequency receiving front-end SiP module based on an HTCC, and belongs to the technical field of microwaves and radio frequency. The radio frequency receiving front end is realized on the basis of an SiP module of the HTCC, the mirror image frequency is far away from the radio frequency signal frequency spectrum through a high local oscillator dual-frequency conversion mode, and the spurious component generated by frequency mixing is moved to a high-frequency area outside an intermediate-frequency passband, so that wide instantaneous bandwidth and high spurious suppression are realized. According to the invention, miniaturization of the SiP module is realized based on the HTCC technology; a secondary frequency conversion superheterodyne circuit architecture and a high local oscillator design are combined, so that the instantaneous working bandwidth is widened to 4GHz, and meanwhile, high spurious suppression is realized; in addition, the vertical interconnection structure is improved, long-distance low-loss transmission of radio-frequency signals is achieved, and the size is further reduced. The ultra-wideband low-noise amplifier has the advantages of miniaturization, wide instantaneous bandwidth, low noise amplification and high spurious suppression, and a solution is provided for miniaturization and low-cost mass production of an ultra-wideband radio frequency system.

There is described a building automation system comprising a mobile tag, sensor devices, and a sensor hub. The mobile tag transmits a broadcast beacon based on RF technology. The sensor devices are co-located with light fixtures and include antennas for receiving a broadcast beacon. The sensor devices generate signals associated with the broadcast beacon received by the antennas. The sensor hub receives the signals from each sensor device and determines a location of the mobile tag based on the signals.

The invention provides a radio frequency power generator, and relates to the technical field of radio frequency. The radio frequency power generator is characterized in that a first input end of an inverter module is connected with a second output end of an oscillation module; the first output end of the inverter module is connected with the second input end of the oscillation module; the power output end of the voltage stabilizing circuit is connected with the power supply voltage input end of the phase inverter module; the power supply input end of the voltage stabilizing circuit inputs external direct-current voltage; the voltage stabilizing circuit generates a target direct-current voltage according to the external direct-current voltage and the sine wave reference amplitude, and inputs the target direct-current voltage into the power supply voltage input end; the oscillation module performs self-oscillation and generates an initial sine wave signal; and the inverter module amplifies the initial sine wave signal according to the target DC voltage, and inputs the amplified initial sine wave signal to the oscillation module, so that the signal output end of the oscillation module outputs a target sine wave signal. According to the invention, the convenience of amplitude adjustment of the radio frequency signal is improved.

The present invention relates to the technical field of radio frequency. Disclosed in the present invention are a radio-frequency power amplifier and a radio-frequency chip module. The radio-frequency power amplifier comprises a signal input end, an input matching circuit, a power amplifier, a bias circuit, and a signal output end, wherein the signal input end, the input matching circuit, the power amplifier and the signal output end are electrically connected in sequence; an input end of the bias circuit is connected to a reference voltage source, and an output end of the bias circuit is connected between the input matching circuit and the power amplifier; the bias circuit comprises a first resistor, a first triode, a second triode, a second resistor, a third triode, a third resistor, a first capacitor and a second capacitor; and a collector of the third triode is connected to a first end of the second capacitor, and an emitter of the third triode is connected to a second end of the second capacitor. The radio-frequency power amplifier in the present invention can increase output power, and can also effectively reduce power consumption and improve the efficiency.

Radio frequency (RF) sensing of a target object by a wireless network is supported by a network node that derives one or more object features for the target object using non-RF sensor measurements and reports the object features to a server for the RF sensing. The non-RF sensors, for example, may be one or more of a camera, ultra-sound sensor, lidar, barometer, etc. The object features for the target object, which may be related to the object size, position, motion, etc. may be separately reported for each non-RF technology or may be reported as a common set of object features. The object feature report may include a time stamp, and may associate an object ID for the target object with the reported object features. Some object features may be prioritized over others, and object features that do not change may not be reported in subsequent reports.