258 results about "Broad bandwidth" patented technology

The invention provides a voltage stability control method for a multi-output switching power supply, which comprises the following steps of: sampling a main output channel in real time to obtain a voltage signal; the voltage signal is processed through a wide bandwidth error amplifier, a main channel adjusting signal is generated, and the main channel adjusting signal is used for driving a main power switch device; receiving an input voltage fluctuation frequency band of an auxiliary channel, a load current transient change gradient and a frequency spectrum coupling characteristic of a main channel adjusting signal through a dynamic prediction model, and generating an auxiliary channel adjusting signal with a phase lead compensation characteristic; a cross coupling active offset mechanism is constructed, time domain-frequency domain characteristics of coupling interference are extracted through a high-precision differential detection circuit, amplitude-frequency adjustable reverse correction signals are generated in real time through an adaptive compensation algorithm and injected into control nodes of an auxiliary output channel, and dynamic decoupling and ripple suppression are carried out. According to the method, high-stability control of multi-channel voltage under all working conditions is realized, and the dynamic response speed and the anti-interference capability are improved.

A low-profile ultra-wideband wide-angle scanning phased-array antenna based on a tight coupling structure is composed of a metal floor and a plurality of antenna units, the antenna units extend in the X polarization direction and the Y polarization direction respectively to form a plane of any size, and an antenna array is formed; the antenna unit sequentially comprises an upper substrate, a dipole antenna and a lower substrate from top to bottom, the dipole antenna is vertically and crossly placed and comprises two layers of dielectric substrates and a layer of prepreg between the two layers of dielectric substrates, and a resistor-coated pattern is printed on the upper surface of the lower substrate.

The invention discloses a broadband wide-angle scanning array antenna based on a metasurface lens, belongs to the technical field of phased-array antennas, solves the problem of how to improve the scanning range and gain of the phased-array antennae, and is characterized in that the metasurface lens with phase gradient is loaded above the phased-array antenna on the basis of not changing the structure of the original phased-array antenna. The beam scanning range of the phased-array antenna is expanded, and the performance such as gain is improved; according to the invention, an original phased-array antenna does not need to be modified and redesigned, additional active devices do not need to be added, new components do not need to be introduced into an original system, the system cost is effectively reduced, the system size is reduced, and the antenna is suitable for scenes, such as unmanned aerial vehicles and low-altitude aircrafts, which have strict requirements on the size and the weight.

Systems and methods for implementing operation-specific impedance matching for enhancing sensitivity of an ultrasound system are described. To enhance sensitivity while using a transducer element for transmission and reception, a transducer module's architecture provides operation-specific impedance matching. Operation-specific impedance matching means that different impedances are provided for mitigating mismatch loss during transmission and reception. The impedance provided for reception can be associated with separate signal path with a smaller amount of attenuation compared to the impedance provided for transmission. In this way, the architecture enhances sensitivity of the ultrasound system by reducing an amount of attenuation experienced during reception compared to other ultrasound systems that utilize a same impedance for impedance matching during transmission and reception. With enhanced sensitivity, the ultrasound system can utilize higher frequencies and / or broader bandwidths to provide high-resolution images at farther imaging depths while meeting power-intensity guidelines.

The invention discloses a non-equilibrium Michelson interferometer electric field sensor capable of automatically calibrating temperature influence, which has the characteristics of wide bandwidth, high measurement precision and small interference of distribution of an electric field to be measured, and can also automatically calibrate temperature influence and prevent a working point of the non-equilibrium Michelson interferometer electric field sensor from deviating. The electric field sensor comprises a lithium niobate substrate, the lithium niobate substrate is provided with a non-equilibrium Michelson interferometer, the non-equilibrium Michelson interferometer comprises an input and output waveguide, the input and output waveguide is connected with a first waveguide arm and a second waveguide arm which are different in length, two sides of the first waveguide arm are provided with electrodes, and the second waveguide arm is provided with electrodes. An antenna is arranged on the electrode, a first metal reflecting mirror is arranged at the tail end of the first waveguide arm, a second metal reflecting mirror is arranged at the tail end of the second waveguide arm, the first metal reflecting mirror and the second metal reflecting mirror are both arranged on the lithium niobate substrate, and the thermal expansion coefficients of the first metal reflecting mirror and the second metal reflecting mirror are different.

Techniques pertaining to wide bandwidth resource unit (RU) tone plan designs for next-generation wireless local area networks (WLANs) are described. An apparatus communicates wirelessly with one other apparatus by either or both: (i) transmitting first data or first information to the other apparatus; and (ii) receiving second data or second information from the other apparatus. In communicating wirelessly, the apparatus communicates in a 240 MHz, 480 MHz, 560 MHz or 640 MHz bandwidth with a subcarrier spacing (SCS) of 78.125 kHz or a multiple of 78.125 kHz.

Various schemes pertaining to long training field (LTF) and short training field (STF) transmission for wide bandwidth 240 MHz with more direct-current (DC) tones in wireless communications are described. A processor of an apparatus generates either or both of an LTF and a STF of a physical-layer protocol data unit (PPDU) with a center 996-tone resource unit (RU) having more than a predetermined number of DC tones. The processor then performs a wireless communication in a wide bandwidth (e.g., 240 MHz) with the PPDU.

The invention relates to a waveform and dispersion comprehensive optimization method for a broadband wide-angle array-fed reflector antenna, and solves the optimization problem that the consistency of gain, sidelobe and frequency band is difficult to consider at the same time. The method comprises the following steps: extracting secondary radiation field data of the array-fed reflector antenna; carrying out feed source excitation phase structured modeling; constructing a multi-target fitness function; performing joint optimization on the two excitation parameters; and applying the optimal excitation parameters. According to the invention, an excitation phase is divided into a delay line length and a phase shifter true value, so that layered regulation and control of dispersion and waveform are realized; a multi-frequency-point multi-target fitness function is constructed, and the optimization efficiency and convergence are improved in combination with an improved multi-population genetic-particle swarm optimization algorithm; on the premise that the antenna structure is not changed, comprehensive optimization of the waveform and dispersion of the directional diagram is achieved only through phase optimization, the physical significance of modeling is clear, the control strategy is simple, the calculation efficiency is high, the engineering adaptability is high, and the method is suitable for application scenes such as GEO SAR with strict requirements for the performance of the directional diagram.

A single-layer broadband vertically polarized endfire magnetoelectric dipole (ME-dipole) antenna and an antenna array. The main radiator of this antenna is a substrate-integrated closed loop, which consists of two horizontal metallic strips printed on the upper and lower surfaces of substrate and a pair of vertical metallic vias. Excited by a double-sided parallel-strip line at the center of the loop, the metallic vias function as electric dipoles while the entire loop aperture works as magnetic dipole. To facilitate integration, this magnetoelectric dipole loop antenna is fed by an open-ended substrate integrated waveguide (SIW), which also works as a backed cavity to enhance the front-to-back ratio. Moreover, rectangular slots are etched at the edges of the SIW aperture to further improve the front-to-back ratio and also the cross-polarization performance. Thus, a vertically polarized endfire ME-dipole loop antenna with a low-profile structure, broad bandwidth, and stable radiation performance is achieved.

The invention belongs to the technical field of wireless communication, and particularly relates to a broadband circular polarization folding transmission array antenna based on a transceiving unit. The antenna comprises a transmit-receive metasurface, a metal reflection surface and a circular polarization feed source. The transmit-receive metasurface provided by the invention is composed of a plurality of transmit-receive units which are arranged periodically; the circularly polarized feed source provided by the invention adopts SIW feed to excite circularly polarized waves, and the metal reflection surface is integrated on the upper substrate of the circularly polarized feed source. The transmit-receive unit provided by the invention has polarization selection and polarization torsion characteristics, can reflect a left-hand circularly polarized wave incident by a feed source, receives a right-hand circularly polarized electromagnetic wave incident by the feed source, transmits the left-hand circularly polarized wave, and forms a high-gain wave beam in a far-field region through phase compensation and polarization torsion. The antenna has the advantages of low profile (3 / F), circular polarization, high gain and wide bandwidth.

The invention discloses a Ka-band broadband characteristic magnetoelectric dipole antenna, and belongs to the technical field of millimeter wave radio frequency front-end devices. The antenna comprises an upper-layer dielectric substrate, a semi-cured layer, a lower-layer dielectric substrate and a metal ground backboard which are stacked from top to bottom. The surface of the upper dielectric substrate is provided with four special hexagonal radiation patches, a central rectangular feed patch and four rectangular parasitic patches. A cross-shaped gap is defined by the four radiation patches, and the center feed patch and the specific metal through hole and the metal blind hole in the lower layer jointly form an inverted L-shaped feed probe. And each radiation patch and each parasitic patch are respectively connected to the metal ground backboard through metal through holes. The antenna has the advantages of wide bandwidth, stable performance and compact structure.

Some wireless communications systems provide communications between user equipments (UEs) and non-terrestrial networks (NTNs). An NTN may include one or more NTN nodes (e.g., satellites). When communicating with low Earth orbit (LEO) satellites, a signal received by a UE may exhibit a time-varying carrier frequency shift or Doppler shift. Some examples of the techniques described herein may address the effects of NTN Doppler on front end processing. Some examples of the techniques described herein may use a Doppler-dependent droop compensation filter after Doppler compensation using a rotator. In some approaches, Doppler-independent droop compensation may be performed. For example, a droop compensation filter may be designed for wider bandwidth that addresses a Doppler shift. A filter for jammer rejection may be utilized based on the Doppler shift or based on an NTN or terrestrial network (TN) scenario.

Various schemes pertaining to long training field (LTF) and short training field (STF) transmission for wide bandwidth 240 MHz with more direct-current (DC) tones in wireless communications are described. A processor of an apparatus generates either or both of an LTF and a STF of a physical-layer protocol data unit (PPDU) with a center 996-tone resource unit (RU) having more than a predetermined number of DC tones. The processor then performs a wireless communication in a wide bandwidth (e.g., 240 MHz) with the PPDU.

The invention discloses a mechanical non-resonant one-bit phase electromagnetic reflection metasurface unit, and belongs to the field of artificial electromagnetic materials. The unit comprises a non-resonant electromagnetic structure and a mechanical driving device. The non-resonant electromagnetic structure comprises a dielectric layer, an air layer and an adjustable metal backboard from top to bottom; the mechanical driving device adopts a bidirectional self-holding electromagnet, a screw rod of the bidirectional self-holding electromagnet is connected with the metal back plate, the back plate is driven to be switched between two preset positions through forward / reverse pulse current, the thickness of an air layer is accurately adjusted, and therefore one-bit dynamic switching of a reflection phase between 0 degree and 180 degrees is achieved through propagation phase accumulation. In the 5G millimeter wave frequency band of 20 GHz to 29.5 GHz, the reflection coefficients of the two states are both larger than 0.99, the phase difference is stabilized within 180 degrees + / -20 degrees, and good robustness is achieved for mechanical displacement deviation. The unit has the advantages of zero static energy consumption, low insertion loss, wide bandwidth, simple structure and simple control, and is suitable for a low-power-consumption intelligent reflecting surface and a dynamic beam forming system.

The utility model relates to the technical field of bionic pressure sensors, in particular to a broadband wide piezoresistive sensing structure simulating scorpion threshold response characteristics, which comprises a threshold adjusting structure and a piezoresistive sensing unit. The threshold value adjusting structure comprises a flexible deformation cover and a threshold value sensing structure base, the flexible deformation cover covers the top end of the threshold value sensing structure base, the piezoresistive sensing unit is arranged in the threshold value sensing structure base, and a rectangular through groove is formed in the bottom of the threshold value sensing structure base; a threading hole is formed in the side wall of the threshold sensing structure base; the flexible deformation cover comprises a sheet, and the center of the lower surface of the sheet is integrally connected with an inverted-cone-shaped protruding block. The problems that the inherent contradiction exists between the sensitivity and the bandwidth performance of an existing piezoresistive sensor, in particular, structural instability under large signals is easily caused when the sensitivity is improved through a traditional design, and the response capacity to small signals is greatly reduced by increasing rigid support to expand the measuring range are solved.

This application provides a dual-polarized differential base station antenna, relating to the field of communication technology. The dual-polarized differential base station antenna includes a dielectric substrate, a first resonant cavity, multiple second resonant cavity groups, a coupling component, and a coaxial feed conductor. The first resonant cavity is disposed inside the dielectric substrate and extends to the upper and lower surfaces of the substrate. A first radiation slot is provided on the upper surface of the first resonant cavity. Multiple second resonant cavity groups are symmetrically distributed around the first resonant cavity. Each second resonant cavity group includes at least one second resonant cavity, and a second radiation slot is provided on the upper surface of each second resonant cavity. The coupling component connects the first resonant cavity to each second resonant cavity group. The coaxial feed conductor is connected to a ground plane and penetrates the dielectric substrate to connect to the upper surface of the first resonant cavity. The dual-polarized differential base station antenna of this application achieves high gain, high isolation, and wide bandwidth performance while maintaining a low profile structure.

Techniques pertaining to global cyclic shift delay (CSD) index assignment for 60MHz distributed-tone resource unit (DRU) short training field (STF) transmission in wireless communications are described. An apparatus (e.g., a station (STA) ) performs a wireless communication by: (a) generating and transmitting a DRU of a physical-layer protocol data unit (PPDU) with tones of the DRU distributed on a 60MHz distribution bandwidth of an 80MHz frequency subblock of two or more frequency subblocks of a wider bandwidth; or (b) receiving and processing the DRU. In performing the wireless communication, the apparatus applies a global CSD on transmission of a STF for the DRU in the distribution bandwidth of 60MHz.

The invention provides an antenna assembly and electronic equipment. The antenna assembly comprises a feed source, a first antenna radiator, a tuning circuit and a second antenna radiator. The first antenna radiator is provided with a first grounding point, a second grounding point, a feeding point and a first tail end which are sequentially arranged at intervals, the first grounding point and the second grounding point are grounded, and the tuning circuit is electrically connected between the feeding point and the feed source; the first antenna radiator generates a first resonance mode supporting a first frequency band and a second resonance mode supporting a second frequency band under excitation of the feed source, and the first frequency band and the second frequency band are located at medium-high frequency. The second antenna radiator is provided with a second tail end and a third grounding point which are arranged at an interval, a coupling gap is formed between the second tail end and the first tail end, the third grounding point is grounded, the second antenna radiator generates a third resonant mode supporting a third frequency band under excitation of the feed source, and the third frequency band is located at medium-high frequency. According to the antenna assembly and the electronic equipment provided by the invention, the bandwidth can be widened, and the cost is reduced.

The application discloses a method for sidelobe suppression of single-bit quantization Chirp signal, and the main technical content of the method comprises sidelobe suppression of single-bit quantization Chirp signal based on a convolution window function. The technical content performs sidelobe suppression through the following steps: step S1, generating a Chirp echo signal; step S2, single-bit quantization of the Chirp signal; step S3, single-bit quantization of a Chirp signal matching filter and adding a convolution window; and step S4, pulse compression of the single-bit quantization Chirp signal. The application can achieve a good compromise between quantization order and pulse compression effect, single-bit quantization can reduce quantization complexity to the maximum extent, and the sidelobe suppression method based on the convolution window function can effectively solve the problem of the decrease of the main sidelobe ratio caused by single-bit quantization. For Chirp signals and other radar signals with large time-bandwidth product, the application can improve the pulse compression effect, improve the range resolution of the radar system, and has certain reference significance for improved design in radar engineering technology.

The embodiment of the application provides a parameter inversion method, device and electronic equipment, wherein the parameter inversion method comprises: performing interference suppression on a received incomplete SAR signal to obtain a non-interference signal matrix; wherein the non-interference signal matrix comprises a plurality of non-interference pulse signals with time sequence continuity, and the incomplete SAR signal represents that the SAR signal is incomplete; sequentially performing data processing on each non-interference pulse signal to obtain pulse parameters of each non-interference pulse signal; the pulse parameters at least comprise a stationary phase center position, a termination point, a pulse bandwidth, a pulse signal frequency modulation rate and a peak position; based on the pulse parameters of each non-interference pulse signal, signal parameters of the incomplete SAR signal are inverted to obtain transmission parameters of the incomplete SAR signal; the signal parameters at least comprise a pulse width, a bandwidth, a frequency modulation rate, a pulse repetition interval and a pulse repetition frequency.

In some embodiments, an amplifier circuit can include an input node and an output node, and an amplifier implemented between the input node and the output node. The amplifier circuit can further include a phase compensation circuit implemented between the input node and an input of the amplifier. The phase compensation circuit can be configured to provide a phase shift that depends on a control voltage. In some embodiments, the amplifier circuit can be implemented as a power amplifier circuit.

A wireless device is configured to transmit radar signals at extremely low spectral density so that the receiver can be operated at the same time without saturating and thereby enabling full-duplex operation. To achieve sufficient range, beamforming is used together with a very long correlation time for detection of the radar signal, in which case the receiver can resolve backscattered or reflected radar signals far below the noise floor, while the bandwidth of the transmitted radar signal can be very high. The wide bandwidth enables the wireless device to maintain a low power spectral density while increasing output power, and also increase the depth resolution. The extremely low power spectral density even in the transmission beam direction makes the probability that communication will be disturbed very low. The high bandwidth calls for digital filters for both transmitted and received signals to equalize the radar frequency response characteristics of the radio unit.

The invention discloses an interference communication integrated waveform generation method based on spectrum dispersion-multi-system phase shift keying. The problems of difficult communication information demodulation and high hardware implementation complexity in interference communication integration research are mainly solved. According to the scheme of the invention, the SMSP interference signal is formed by periodically expanding the chirp signal on the time domain, the communication information is modulated on the phase of the chirp signal, and the plurality of chirp signals carrying the communication information can cause dense false target interference at random positions on the radar, so that the interference and communication integrated signal is generated. At a communication receiving end, a first linear frequency modulation signal is adopted to perform carrier synchronization, so that the synchronization effect can be improved by using the high time width-bandwidth product characteristic of the linear frequency modulation signal, and communication information can be demodulated directly by using a coherent demodulation mode; at a radar receiving end, the signal can generate a radar interference effect with dense false target characteristics.

This invention provides a wideband airspace radiation device and a wideband anti-unmanned system. The wideband airspace radiation device includes a mounting plate; a first-band radiator is arranged at the center of the mounting surface to provide omnidirectional coverage of the first band; several parasitic elements are arranged circumferentially along the first-band radiator; the second-band radiator employs directional antenna elements, with at least two second-band radiators symmetrically arranged on both sides of the first-band radiator; wherein the parasitic elements are located between the first-band and second-band radiators, and the parasitic elements are used both to guide the electromagnetic field distribution of the first-band radiator and to reflect and guide the electromagnetic waves emitted by the second-band radiator; the several second-band radiators achieve omnidirectional coverage of the second band in a back-to-back configuration. The wideband airspace radiation device provided by this disclosure can eliminate the coverage blind spots of multi-band combined omnidirectional radiators, achieving effective protection of targets.

This disclosure provides methods, components, devices and systems for transmission of resource units by narrow bandwidth operating devices in wide bandwidth spectrum. A station (STA) may identify or receive a resource unit (RU) allocation including a global RU index for a wide bandwidth. The STA may translate the global RU index into a local RU index for a local tone plan, may map the assigned RU to distributed RU (dRU) tones over a corresponding distribution bandwidth, and may shift the mapped dRU tones to align with the wide bandwidth. The STA also may support transmission of short training fields (STFs) and long training fields (LTFs) using a similar mapping and shifting, or using tones of the wide bandwidth that fall within the distribution bandwidth region. A STA also may support a tone plan splitting a wide bandwidth into segments of the distribution bandwidth to allow direct mapping.

The invention relates to a broadband data processing method and device based on a brain-like architecture, computer equipment, a computer readable storage medium and a computer program product. The method is applied to a neuromorphic calculation unit, and the neuromorphic calculation unit comprises a plurality of synaptic calculation units. Comprising the following steps: acquiring to-be-processed data, and distributing the to-be-processed data to each synaptic calculation unit; obtaining operation index data of each synaptic calculation unit, and calculating a corresponding bandwidth allocation weight according to the operation index data; the operation index data is used for representing the resource use efficiency of the synaptic computing unit; according to each bandwidth allocation weight, extracting a target processing path from the hierarchical network topology structure of the neuromorphic computing unit; the hierarchical network topology structure comprises a plurality of computing nodes, and each computing node corresponds to one or more synaptic computing units; and transmitting and processing the to-be-processed data according to the bandwidth allocation weight and the target processing path. By adopting the method, the data processing flexibility can be improved.

The application discloses a kind of adjustable distributed optical fiber sensing performance promotion device, sensing system and method, device includes: narrow linewidth laser, acoustooptic modulator, first signal generator and frequency shift ring;Narrow linewidth laser is configured to output narrow linewidth laser to acoustooptic modulator;First signal generator is configured to generate pulse function signal, function signal controls acoustooptic modulator, and single-frequency laser is modulated into pulsed light;Acoustooptic modulator is configured to modulate single-frequency laser into corresponding pulsed light in acoustooptic modulator according to the pulse function signal generated by first signal generator;Frequency shift ring is configured to multiple cyclic frequency shifts of pulsed light into it, and generate broadband multi-frequency light output.The device generates MHz-level pulsed light by acoustooptic modulator modulation, and generates GHz-level broadband multi-frequency light by multiple cyclic frequency shifts of frequency shift ring, which is applied to sensing system, and the response bandwidth of sensing system can be improved, and the flexibility of sensing test is improved.

To provide a compact antenna device capable of operating over a wide bandwidth. [Solution] The antenna device comprises a ground conductor, a feed point, a first conductor connected to the feed point and operating in a first frequency band, and a second conductor electrically coupled to the first conductor at a distance and operating in a second frequency band. The second conductor has a grounding portion connected to the ground conductor and a proximity portion closest to the first conductor. The second conductor has a convex portion in the conductor connecting the grounding portion and the proximity portion that protrudes away from the first conductor.

A spectral domain optical coherence tomography (OCT) system utilizes an electrowetting prism having four isolated electrodes and configured to deflect a light beam according to an actuating control signal applied to the electrodes. The control signal causes the light beam to laterally scan over a sample. The light beam is produced by a broad bandwidth laser and light from the sample and a reference path is provided to a spectrometer for analysis. The light source may be an all-normal-dispersion fiber laser seeding a gain-managed nonlinear fiber amplifier. The electrowetting prism is capable of scanning up to ±6°. The system is low power and operates at kHz speed.

The application relates to the technical field of mobile communication, and discloses a dual-polarization dipole antenna based on odd mode and even mode fusion, which comprises a dielectric plate, a first dipole and a second dipole, the first dipole is printed on the upper surface of the dielectric plate, the second dipole is printed on the lower surface of the dielectric plate, and the first dipole is perpendicular to the second dipole. The application solves the problems that the existing dual-polarization dipole antenna cannot simultaneously meet the requirements of miniaturization and wide bandwidth.