95 results about "Frequency coverage" patented technology

The invention relates to a double-frequency filtering metasurface design method based on topological optimization. The method comprises the following steps: establishing a two-dimensional simulation model comprising a double-frequency filtering metasurface matrix and a scatterer; according to a preset target forbidden band, taking a forbidden band frequency covering frequency doubling target interval as a fitness function, coding the binary matrix representing material distribution as a chromosome to perform optimization iteration of the chromosome, and obtaining the chromosome with the maximum fitness function value; in optimization iteration, material distribution corresponding to chromosomes is constructed on a two-dimensional simulation model, an energy band structure of the two-dimensional simulation model is obtained, and a fitness function value is calculated; and according to the binary matrix of the chromosome with the maximum fitness function value, outputting final optimized material distribution of the double-frequency filtering metasurface, and performing performance verification on a result through simulation to obtain the double-frequency filtering metasurface of which a fundamental frequency wave can be blocked through a double-frequency wave. Compared with the prior art, systematic optimization of the frequency doubled sound filtering scene is realized.

Devices, systems, methods, and processes for resource allocation among network devices are described herein. Access points (APs) with overlapping Radio-Frequency coverage may interfere with each other's transmission and reception operations. To address this, a device is provided with a bandwidth allocation logic that allocates resources among APs in a time and frequency domain. The device may determine a first transmission opportunity (TXOP) schedule and may obtain a second TXOP schedule associated with at least one network device. The device may determine whether there is any conflict between the first TXOP schedule and the second TXOP schedule. In case there is any conflict, the device may resolve the conflict and based on the resolution the network device may generate an aggregate TXOP schedule that may include proportions of resource units allocated to the device and the network device. The device may transmit the aggregate TXOP schedule to the network device.

The invention discloses a bow net offline electromagnetic interference multichannel data acquisition and analysis method and device, and belongs to the technical field of electromagnetic interference test and analysis. A transient electromagnetic signal of pantograph-catenary discharge is acquired through cooperation of multiple antennas, multiple probes and multiple channels, and strict alignment of multi-source data under the same discharge event is realized through unified triggering and time base line unification; in the off-line stage, denoising, feature extraction and multi-event statistical modeling are carried out on data generated by triggering, so that multi-path and multi-mode electromagnetic characteristics of pantograph-catenary discharge and statistical laws of the multi-path and multi-mode electromagnetic characteristics of pantograph-catenary discharge are obtained; the device comprises a data acquisition unit, a synchronous trigger unit, an analysis processing unit and an interactive display unit, and can improve data processing efficiency and analysis depth while ensuring high sampling rate and broadband coverage; the device solves the problems of insufficient space coverage, poor synchronism and limited analysis capability in the existing pantograph-catenary discharge test, and is suitable for pantograph-catenary discharge mechanism research, electromagnetic interference evaluation and related engineering application.

Adjustable combination tuning probes for slide screw load pull tuners allow larger frequency coverage Fmax / Fmin and higher VSWR beyond the capacity of existing tuning probes. This is done by combining two equally or unequally long tuning slugs, a fixed slug and a mobile slug into a combination probe assembly being mounted in the same mobile tuner carriage. The mobile slug slides on a top bar and is lockable at adjustable distance from the fixed slug. The distance (gap) is adjustable by engaging and moving the assembly against the prongs of forks attached to the slabline at the test or idle ports.

A transportable ultra-wideband frequency spectrum monitoring and direction finding device relates to the technical field of radio direction finding and comprises a plurality of direction finding antenna arrays including a first amplitude comparison direction finding antenna array, a second amplitude comparison direction finding antenna array, a virtual baseline direction finding antenna array, a five-element interferometer direction finding antenna array and a Wattson-Watt direction finding antenna array. The plurality of switch matrix networks are respectively connected with the corresponding direction-finding antenna arrays and are used for switching multiple paths of antenna signals and injecting calibration signals; the plurality of down-conversion board cards are respectively connected with the corresponding switch matrix networks and are used for converting the radio frequency signals of different frequency bands into intermediate frequency signals through multi-stage frequency conversion processing; the digital receiver is connected with the plurality of down-conversion board cards and is used for carrying out direct acquisition and channelization processing on the intermediate frequency signals; and an industrial personal computer. The method and the device are used for solving the problems of limited frequency coverage range, limited lateral azimuth coverage range and limited receiving dynamic range of traditional lateral equipment.

The invention discloses an ultra-wideband honeycomb wave-absorbing structure and equipment with independently regulated electromagnetic loss. The structure comprises a supporting structure, a low-frequency magnetic wave-absorbing structure and a high-frequency electric resonance type wave-absorbing structure. Wherein the supporting structure is a main body structure of the ultra wide band honeycomb wave-absorbing structure with independently regulated electromagnetic loss, and is used for supporting and fixing the low-frequency magnetic wave-absorbing structure and the high-frequency electric resonance type wave-absorbing structure. The low-frequency magnetic wave-absorbing structure is used for absorbing electromagnetic waves of P and L wave bands, and the high-frequency electric resonance type wave-absorbing structure is used for absorbing electromagnetic waves of S to Ku wave bands. According to the structure, the advantages of different wave-absorbing mechanisms are comprehensively utilized, the advantages of broadband, low-frequency coverage and low reflectivity are considered under the low-profile performance, the independent regulation and control capacity of the low-frequency wave-absorbing structure and the high-frequency wave-absorbing structure is good, the high-frequency wave-absorbing structure can introduce different performances by flexibly designing different structures, and the flexibility is higher. The invention relates to the technical field of electromagnetic protection and radar stealth.

This application provides an earphone and a terminal device. The earphone includes a housing with a cavity structure inside, and a sound outlet communicating with the cavity structure. A first sound unit, a second sound unit, and a third sound unit are disposed within the cavity structure, and the third sound unit is a microelectromechanical system (MEMS) unit. The sound frequency of the second sound unit is greater than but less than the sound frequency of the first sound unit. The third sound unit, being a MEMS unit, is located between the first sound unit and the sound outlet. By incorporating the first sound unit, the second sound unit, and the MEMS unit within the earphone, the output bandwidth of the earphone can be fully guaranteed, achieving better full-frequency coverage and superior sound quality.

The invention provides a novel dual-frequency dual-circularly polarized satellite antenna, and relates to the technical field of satellite antennas. The satellite antenna comprises a ground plane, a single-feed-point coaxial line, a dielectric substrate and a metal patch connected to the dielectric substrate. A gap layer is arranged between the ground plane and the dielectric base. The single-feed-point coaxial line passes through the gap layer and the dielectric substrate so as to be electrically connected with the ground plane and the metal patch. The metal patch comprises a circular patch on the inner layer and a rectangular patch arranged on the outer layer of the circular patch in a sleeving mode. The circular patch is provided with a rectangular groove so as to realize right-handed circular polarization. Two opposite sides of the rectangular patch are respectively provided with a long branch knot and a short branch knot so as to realize left-hand circular polarization. The four corners or the positions close to the four corners of the rectangular patch are electrically connected to the circular patch. The antenna has good dual-frequency coverage, circular polarization characteristic and gain performance in the L and S frequency bands.

The embodiment of the application provides a kind of wide frequency signal dynamic generation method and system based on multiple clock sources, the method comprises: by field programmable gate array real-time monitoring target frequency, and based on the frequency band of target frequency belongs to automatically switched to corresponding target clock source;When the target clock source is switched, the phase difference corresponding to the new and old target clock source is corrected by phase compensation register, and the compensation value is loaded to the phase offset register of direct digital frequency synthesis chip;Based on direct digital frequency synthesis chip, generate the fundamental wave waveform of wide frequency signal, and superimpose multiple harmonic components by sub-accumulation method, and the amplitude of each harmonic is independently controlled by look-up table method;The output signal of power amplifier is extracted by analog-digital converter, and the error information of measured waveform and theoretical waveform is extracted and dynamically corrected phase offset register and harmonic amplitude look-up table coefficient, and output target wide frequency signal.The application realizes the unity of wide frequency coverage, high resolution and fast response.

The present disclosure belongs to the technical field of antennas. Provided are a panel antenna and an electronic device, which can solve the problems of existing panel antennas, such as low aperture efficiency, uneven radiation amplitude, difficulty in achieving multi-frequency coverage. The panel antenna in the present disclosure comprises a waveguide structure, a first dielectric substrate, a radiation layer and a plurality of switch units, wherein the radiation layer has a plurality of slit openings; the switch units are arranged so as to correspond to the slit openings on a one-to-one basis, and are configured to control whether the slit openings corresponding thereto are open / closed; the radiation layer is divided into a middle region and a peripheral region; and the slit openings located in the middle region among the plurality of slit openings are divided into a plurality of groups, each group of said slit openings comprises at least a plurality of first slit openings, at least some of the first slit openings located in different groups have different sizes, and the closer a group of slit openings to the centre of the middle region, the larger the size of the first slit openings in said group of slit openings. The panel antenna in the present disclosure has the advantages of high aperture efficiency, multi-frequency coverage and even radiation amplitude.

The application discloses a sound field partition control method, electronic equipment and a vehicle. The sound field partition control method comprises the following steps: based on a plurality of target audio signals, a plurality of loudspeakers with different frequency coverage ranges in a target sound field control area are controlled; wherein the plurality of target audio signals are obtained based on an original audio signal and a plurality of different sound field partition control algorithms. The method can combine the advantages and limitations of a plurality of different sound field partition control algorithms, select a suitable sound field partition control algorithm to process the original audio signal, so that the target audio signal can take into account more optimization characteristics, and improve the listening experience and audio comfort.

The invention provides a fusion antenna, and relates to the technical field of antennas. The fusion antenna comprises a Vivaldi type antenna unit and a TEM horn radiation unit. An open slot line is arranged on a polar plate of the Vivaldi type antenna unit; the size of the open slot line is the same as that of radiation polar plates which are symmetrically distributed based on a central axis in the TEM horn radiation unit; a feed end of a radiation polar plate in the TEM horn radiation unit is inserted into the Vivaldi type antenna unit along the open slot line, and a radiation end extends out of the open slot line; and the center line of the radiation polar plate in the TEM horn radiation unit is overlapped with the open slot line. According to the invention, the Vivaldi-type antenna and the TEM horn radiation antenna are fused, the advantages of the Vivaldi-type antenna and the TEM horn radiation antenna are combined, the transmission stability is high, and the broadband coverage capability is improved.

The invention belongs to the technical field of micro-nano plasma switches and radio frequency and power circuits, and particularly relates to a frequency-adjustable high-power pulse signal generation circuit based on a micro-nano plasma switch, which comprises a sinusoidal signal generation module, a tuning module and a micro-nano plasma switch module, the sinusoidal signal generation module comprises an NMOS cross coupling pair, a PMOS cross coupling pair and an LC resonant cavity. The tuning module comprises a capacitor array and a frequency tuning module. A micro-nano plasma switch is used for realizing large-current transmission and is matched with a sine wave signal to generate a specific pulse signal. An inductor and a variable capacitor are introduced into the LC resonant cavity and the frequency tuning unit, and the capacitance value is adjusted by changing the end voltage of the capacitor, so that the circuit outputs a pulse signal of which the frequency covers a low frequency band to a terahertz frequency band under the control of different voltages. The pulse signal generated by the circuit has the characteristics of high power, picosecond-level rising edge and different repetition frequencies, and is suitable for terahertz communication, radar and other systems.

The utility model relates to the field of radio transceiving, and discloses an ultra-wideband extremely-small-step frequency hopping frequency synthesizer module. According to the invention, the high-speed dot frequency array divides an ultra-wideband frequency 9-18GHz signal into 8 segments, and the 8 segments are respectively shifted and converted to 1000-2200MHz for frequency and phase discrimination, so that the phase discrimination frequency is greatly reduced, excellent phase noise can be obtained, and ultra-wideband frequency coverage is realized at the same time. The adopted high-speed dot frequency phase-locked array is low in phase noise and large in frequency span coverage, the switching time is short through a high-speed switch, large-range fast frequency hopping can be achieved, and powerful support is provided for prolonging the large-range frequency hopping time of a whole circuit system. A DDS direct digital frequency synthesis circuit is adopted, near-end stray is low, high-frequency resolution is provided, and extremely low frequency stepping can be achieved. And the frequency hopping speed is high and reaches below 1uS, so that the rapid frequency hopping of the frequency synthesizer system can be realized.

The invention relates to a 5GNTN low earth orbit satellite frequency conversion device for realizing broadband coverage, which comprises a reference clock unit, a frequency conversion unit, a local oscillation leakage suppression unit, a gain selection control unit and a frequency synthesis control unit, and is characterized in that the output end of the reference clock unit is connected with the input end of the frequency conversion unit; the output end of the frequency conversion unit is connected with the input end of the local oscillation leakage suppression unit, the output end of the local oscillation leakage suppression unit is connected with the input end of the gain selection control unit, and the output end of the gain selection control unit is connected with the input end of the frequency synthesis control unit. By adopting the 5GNTN low earth orbit satellite frequency conversion device for realizing broadband coverage, through the design of broadband and large dynamic gain, the requirement of frequency coverage of a 5G NTN low earth orbit satellite from an s wave band to a ka wave band at present is met, and meanwhile, an effective and broadband coverage frequency conversion means can be provided for navigation satellites, military satellites and the like.

Multi-band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by carving multiple slugs of different length and frequency coverage as segments of a disc-shaped revolving slab, which rotates inside the legs of a captive unit and locks at distinct angles. The captive unit is attached to the vertical control mechanism of the tuner and rotation is ensured using multiple traverse lateral studs on the disc unit and a set of vertical studs on the slabline close to the idle port of the tuner. An automated procedure ensures remote switching between tuning slugs. Calibration and tuning is as in prior art single probe tuners.

The invention relates to the technical field of stimulation signal control, in particular to a method and a system for stimulating a nozzle by Beijing porcelain nozzle printing software. According to the method and the system, through structural decomposition of a printing task parameter group, one-to-one indexing between a nozzle number and a pattern block position is completed, and a matching system with a sequence attribute is established; the controllability of parameter management and the accuracy of scheduling are enhanced, the time sequence identification of frequency coverage and use frequency is carried out through the long and short-term memory network, the screening mechanism of excitation numbers is optimized, the excitation intensity of unnecessary nozzles is reduced, the problem of thermal load accumulation caused by frequent excitation is relieved, and the service life of the nozzles is prolonged. A genetic algorithm is introduced to realize a multi-round iterative substitution and screening mechanism of combination numbers, on the basis of ensuring combination matching logic integrity, diversity and distribution efficiency of electrical stimulation frequency use are improved, collaborative optimization of a nozzle excitation strategy under multivariable dimensions is realized, and stability of system response and signal excitation execution efficiency are improved.

The invention provides a transformer null line live-line fault point judgment detector, and relates to the field of power fault diagnosis equipment. The transformer null line live-line fault point judgment detector comprises a three-layer design architecture including a sensing layer, an analysis layer and an interaction layer, the sensing layer carries out signal capture by setting a broadband electromagnetic induction array, the sensing layer is composed of electromagnetic induction array hardware and a frequency coverage module, and high-sensitivity electromagnetic capture is realized by cooperating with a spatial arrangement technology. The hardware of the electromagnetic induction array is eight groups of nanocrystalline alloy induction coils which are annularly distributed, and each group of coils is connected in series with a 0.1 mu F high-frequency capacitor. Accurate anti-interference is realized through topology identification and feature matching, the positioning speed is improved by 300 times, the detection efficiency is greatly improved, meanwhile, the power failure loss is reduced, the economic benefit is remarkably improved, and the risk of manual contact with a live line is thoroughly eliminated.

An automatic-reconstruction extensible multi-channel array receiver comprises a receiver body and is characterized in that the receiver body is of a layered structure and is sequentially provided with a basic module and N extension modules from bottom to top, and the N extension modules comprise at least one channel extension module and at least one frequency extension module; a first power supply conditioning circuit is arranged in the basic module, second power supply conditioning circuits are arranged in the expansion module, and the first power supply conditioning circuit is connected with each second power supply conditioning circuit through a power supply bus; a first digital control circuit is further arranged in the basic module, second digital control circuits are further arranged in the expansion module, and the first digital control circuit is connected with the second digital control circuits through an offline instruction data bus. The method has the advantages that the number of channels and the frequency coverage range can be expanded by increasing new modules, and repeated input of hardware cost is avoided.

Triple band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by combining two types of tuning slug, a core slug and a saddle slug into a configurable tuning probe assembly mounted in the same mobile tuner carriage and controlled using the same single vertical axis mechanism with the help of two ridges on the core slug and a permanently mounted slug control fork. To avoid spurious resonance phenomena the tuning slugs are controlled, driven, and locked vertically sliding on each other, and guided appropriately allowing smooth, uninhibited vertical movement of the metallic bodies.

An extensible multi-channel array receiver comprises a receiver body and is characterized in that the receiver body is of a layered structure and is sequentially provided with a basic module and N extension modules from bottom to top, and the N extension modules comprise at least one channel extension module and at least one frequency extension module. The base module and the extension modules are of a rectangular structure, mounting seats are arranged at the four vertex angles of the base module and the extension modules, mounting holes are formed in the mounting seats, the base module and all the extension modules are sequentially spliced together in an overlapped mode, the same mounting column penetrates through the mounting holes in the four corners and is fixed, and the layered structure is formed. The method has the advantages that the number of channels and the frequency coverage range can be expanded by adding new modules, and repeated input of hardware cost is avoided.

The utility model discloses a radio frequency power coupler in the technical field of power couplers. The radio frequency power coupler comprises a probe assembly which comprises a plurality of paths of forward power probes and reflection power probes, and the detection frequency ranges of the forward power probes and the reflection power probes are different; the frequency coupling unit is used for performing frequency sampling on the power transmission line of the machine to be tested; the logic board is electrically connected with the frequency coupling unit and the probe assembly, and the logic board is used for obtaining the frequency data collected by the frequency coupling unit and calling a forward power probe and a reflection power probe in the probe assembly according to the frequency data; and the power module is used for supplying power to the logic board. According to the radio frequency power coupler, the detection frequency coverage range is expanded in a mode of arranging a plurality of groups of probes, then frequency sampling is performed on the power transmission line, and the probes in different detection frequency ranges are adaptively called accordingly, so that the problem that the coupler needs to be frequently replaced when a machine with high and low frequencies is tested is avoided.

The present invention discloses the structural composition, operating principle, and usage of a vibration sounder with adjustable diaphragm size and shape. The vibration sounder designed and manufactured using this solution can control the inner and outer diaphragms to operate separately according to the needs of sound field simulation, thereby achieving the purpose of changing the size and shape of the vibration diaphragm, expanding the frequency coverage of the sound source field, thereby enriching the sound source field characteristics and improving its ability to simulate the sound field of different objects.

The utility model discloses a ridge waveguide port double-channel combiner, which comprises an upper cavity, a lower cavity is arranged at the rear end of the upper cavity, a ridge waveguide port A is arranged at the front end of the lower cavity, a plurality of fixing screws are arranged at the front end of the lower cavity, a WR standard waveguide port is arranged at the front end of the upper cavity, and the WR standard waveguide port is arranged at the front end of the lower cavity. The front end of the upper cavity is provided with an adjusting screw, the outer side of the adjusting screw is sleeved with a rubber pad, a magic T design mode is adopted in a transmitting path and a receiving path, a double-path and double-path combination function is achieved, the frequency covers the WR187 / BJ48 full frequency band, a silicon carbide customized load is adopted, the power bearing capacity of the product is larger than 200 W, and the low-loss and low-standing-wave-ratio performance is achieved. According to the utility model, two paths of loss balance is less than 0.1 dB, the structure and the function of adjusting loss balance are realized, an antenna port adopts a standard WR187 / BJ40 standard waveguide port, a transceiving port adopts a non-standard ridge waveguide port, the structure is compact, and the low intermodulation performance is good.

The invention relates to the technical field of building decoration construction, and discloses a decorative sound-absorbing wall which comprises a sound-absorbing wall body, the sound-absorbing wall body comprises a wall body unit, an adjusting unit is arranged on the surface of the wall body unit, and a secondary sound-absorbing unit is arranged on the inner wall of the wall body unit. According to the decorative sound-absorbing wall surface, the adjustable air cavity is driven by the lead screw to be linked with the base layer plate, a Helmholtz resonance system is constructed, the thickness of the air cavity is adjusted within the range of 10-80 mm, the frequency coverage is 100-400 Hz, the lead screw is clamped and fixed by the spring, and the sound absorption efficiency is improved at the low-frequency band of 100-500 Hz; a sliding rail-lead screw structure enables the base layer plate to slide, adapts to new and old wall surfaces, is manually adjusted to adapt to scenes such as office areas and music halls, and is suitable for scene expansion; according to the spring clamping type secondary sound absorption unit, 500-5000Hz sound waves are processed through glass wool, 100-5000Hz full-band coverage is formed through low-frequency resonance, rapid glass wool replacement is supported, the maintenance cost is reduced, the medium-high frequency absorption efficiency is improved, and noise reduction and convenient maintenance are combined.

The utility model discloses a frequency spectrograph system carried by an unmanned aerial vehicle and an air frequency spectrum monitoring system. The frequency spectrograph system comprises a frequency spectrum monitoring end, a remote control end, a frequency spectrograph, a receiving module, an upper computer and a signal transmission module, the frequency spectrograph, the receiving module, the upper computer and the signal transmission module are all mounted on the frequency spectrum monitoring end; the input end of the frequency spectrograph is connected with the receiving module; the output end of the frequency spectrograph is connected with the upper computer; and the upper computer communicates with the remote control terminal through the signal transmission module. The air spectrum monitoring system comprises the spectrum analyzer system. According to the utility model, the frequency coverage range, the monitoring sensitivity and the measurement range of the system can be ensured, so that the system can also ensure the accuracy and the real-time performance of monitoring data in a complex electromagnetic environment.

The invention relates to the field of pallets, and discloses a shock absorption pallet which comprises a bearing frame and a shock absorption assembly, and the shock absorption assembly comprises shock absorbers and shock absorption connecting pieces. The bearing frame is connected with the mounting base through the damping assembly, one end of the damper is connected with the bearing frame, and the other end of the damper is connected with the mounting base through the damping connecting piece so as to absorb vibration transmitted to the bearing frame and target equipment by the mounting base, improve the shock resistance of the pallet and provide effective protection for the target equipment. And the target equipment is prevented from being damaged to the greatest extent. Compared with shock absorption structures such as rubber pads and spring shock absorption structures in the prior art, the shock absorption assembly adopts the shock absorbers as the shock absorption structures, the shock absorption frequency coverage is wider, the shock absorption assembly can cope with various types of vibration, the shock absorption effect of the shock absorption assembly is enhanced, the adaptability of the shock absorption assembly to various different working conditions is improved, and the service life of the shock absorption assembly is prolonged. And resonance can be restrained, damping failure is avoided, vibration is actively isolated, the vibration isolation effect is good, and the damping efficiency is improved.

The present application relates to the technical field of terahertz spectrum detection, in particular to a kind of directly encoded waveform's atomic terahertz spectrum detection method and device, the detection method uses " direct modulation coding + algorithm reconstruction", the bandwidth of the terahertz frequency domain spectrum obtained overcomes the narrow bandwidth defect of atomic detection, the frequency coverage range of its spectrum is determined by the bandwidth of terahertz modulator, is not limited by the intrinsic narrow bandwidth of atomic detector, realizes the terahertz spectrum fast and efficient detection of more than GHZ bandwidth, can be applied to gas component detection, substance concentration analysis, nondestructive testing and other fields, has good application value.

Tri-state triple band remotely configurable tuning probes for slide screw impedance tuners allow instantaneous larger frequency coverage beyond the capacity of existing tuning probes using the single horizontal and vertical axis mechanism of a prior art single probe, single band tuner. This is done by combining two tuning slugs, a master slug and a slave slug into a configurable tuning probe assembly mounted in the same mobile tuner carriage and controlled using a single vertical axis mechanism. To avoid spurious resonance phenomena the tuning slugs are controlled, driven, and locked vertically sliding on each other, and guided appropriately allowing smooth, uninhibited vertical movement of the metallic bodies.