90results about How to "Bandwidth" patented technology

The pull-type transient electromagnetic detection system comprises a detection module, a detection assembly comprises a transmitting coil, a receiving coil and a host, the transmitting coil and the receiving coil are arranged in parallel, the height between the transmitting coil and the receiving coil is adjustable, one end of the host is connected with the transmitting coil, and the other end of the host is connected with the receiving coil. The horizontal relative position of the receiving coil and the transmitting coil can also be adjusted, the position of the receiving coil is determined when the mutual inductance of the transmitting coil and the receiving coil is zero, the signal processing module comprises an amplifier and a noise processing module, and the receiving coil, the amplifier, the noise processing module and the host are sequentially connected. Signal processing is carried out through the following steps: 1, coil laying; 2, setting an amplifier circuit; 3, electromagnetic noise suppression; according to the invention, in the electromagnetic signal acquisition process and the electromagnetic signal processing process, the quality of the electromagnetic signal is improved, so that the electromagnetic signal with higher quality can be comprehensively obtained.

The invention belongs to the field of organic electroluminescent materials, and discloses a blue light host material, a preparation method and an organic electroluminescent device. The structure of the blue light host material is as shown in a chemical formula I: # imgabs0 #. After the blue light host material provided by the invention is applied to the organic electroluminescent device, the driving voltage of the photoelectric device can be reduced, the luminous efficiency of the photoelectric device can be improved, and the service life of the photoelectric device can be prolonged.

The invention discloses an MIMO terminal antenna loaded with lumped capacitance, and belongs to the technical field of wireless communication. The antenna comprises a horizontal dielectric substrate, two vertical dielectric substrates intersecting with the horizontal dielectric substrate, a metal ground and N dual-port coupled feed antenna pairs, 2N + 2 gaps are formed in the long edge of the metal ground, and the metal ground is printed on the upper surface of the horizontal dielectric substrate; the N dual-port coupled feed antenna pairs are arranged on the two vertical dielectric substrates, N / 2 dual-port coupled feed antenna pairs are arranged on the inner side of each vertical dielectric substrate, and each dual-port coupled feed antenna pair comprises a shared radiator, two feed branches, two L-shaped coupled feed branches and a lumped capacitor. Signals are transmitted to the shared radiator in an electromagnetic coupling mode, the lumped capacitance is loaded in the shared radiator, the matching impedance of the antenna structure is changed, signal loss is reduced, the bandwidth is improved, and meanwhile low cross coupling and small radiation interference are achieved.

The invention discloses an MgO-C nano chain, a preparation method thereof and application of the MgO-C nano chain as a wave-absorbing material, a horizontal tube furnace is adopted for preparation, and an evaporation area and a reduction area are arranged at the two ends of a furnace body respectively; taking Mg (acac) 2 as a precursor, and placing the precursor in an evaporation area; placing a substrate for collecting products in a reduction area; inert gas is adopted as carrier gas and reaction atmosphere, a vacuum pump system is used for maintaining the internal pressure intensity of the system, reaction is conducted, and the MgO-C nano chain is collected on the substrate. In the MgO-C nano chain, the nano MgO particles are connected into a three-dimensional structure through carbon, the wave-absorbing effects such as interface polarization and multiple scattering reflection are enhanced by means of the unique structure, the wave-absorbing performance is greatly improved, and the frequency band is widened. The material has good microwave absorption performance, and has a very good application prospect in the fields of stealth technology and electromagnetic shielding.

The invention discloses a three-dimensional coupling triple-band antenna for wireless network communication and a communication system, and belongs to the field of communication antennas. According to the antenna, a monopole main radiation unit, a first auxiliary oscillator unit, a second auxiliary oscillator unit, a first resonant structure, a second resonant structure, a third resonant structure and a feed port are respectively arranged on a metal base, and a shell which is buckled on the metal base and is used for protecting each component is arranged. The three-frequency antenna combines the monopole frequency doubling effect, the space electromagnetic coupling and the auxiliary oscillator resonance technology, realizes broadband work on three different frequency bands, and effectively improves the spectrum utilization rate and the communication performance of wireless communication equipment. And meanwhile, the vertically arranged metal rod structure oscillators are ingeniously adopted as the monopole main radiation unit to adjust the frequency doubling resonant frequency and reduce the height of the antenna at the same time.

The invention provides an electronic device. The electronic equipment comprises a floor and an antenna assembly. The floor comprises a first edge and a second edge which are connected in a bent mode, and the first edge is longer than the second edge. The antenna assembly comprises a first antenna, and the first antenna comprises a first radiator and a first feed source; at least part of the first radiating body is arranged corresponding to the first edge, the first radiating body comprises a first main radiating body and a first parasitic radiating body, the first main radiating body comprises a first end, a first feeding point and a first coupling end which are arranged in sequence, and the first parasitic radiating body comprises a second coupling end and a second end which are arranged in sequence; the first feed source is electrically connected to the first feed point and excites the first resonant mode to support a first sub-band of a first target band, the second resonant mode supports a second sub-band of the first target band, the band ranges of the first sub-band and the second sub-band are different, the first resonant mode comprises a parasitic mode of the first parasitic radiator, and the second resonant mode comprises a parasitic mode of the second parasitic radiator. The second resonant mode includes a zero-order mode.

The invention provides a force feedback sensor ground self-detection circuit and method, and the circuit comprises a power amplifier drive circuit which is used for receiving a ground self-detection excitation signal and driving a torque device to work according to the ground self-detection excitation signal, and a modulation circuit which is used for carrying out the carrier adjustment of a weak output signal of the torque device. The demodulation circuit is used for recovering an original external excitation signal from the modulated output signal; the correction circuit is used for correcting the demodulated output; the gain adjusting circuit is used for carrying out gain adjustment on the corrected output signal and feeding back the corrected output signal to the power amplifier driving circuit; the output stage circuit is used for outputting the signal after gain adjustment; and the sampling circuit is used for adjusting the gain of the closed loop formed by the self-detection circuit. By adopting the circuit, the power supply of the flight control system can be directly controlled, the purpose of ground self-inspection by using a non-isolated power supply is achieved, and the problem of high development cost of a force feedback sensor caused by a traditional self-inspection circuit is solved.

The invention discloses a UWB antenna, and relates to the technical field of wireless communication. The UWB antenna comprises a substrate, a radiating body and a grounding body, the substrate is provided with a first surface and a second surface which are arranged back to back, the radiating body is arranged on the first surface in an attached mode, the radiating body is provided with a feed port, the grounding body is arranged on the second surface in an attached mode, the radiating body is electrically connected with the grounding body, and the feed port is connected with the grounding body. The substrate is provided with a first via hole and a second via hole which are arranged at an interval, the first end of the first via hole and the first end of the second via hole are both electrically connected with the radiator, and the second end of the first via hole and the second end of the second via hole are both electrically connected with the grounding body to form a closed loop. According to the scheme, the problems that the profile of an existing UWB antenna is high and the beam design difficulty is large can be solved.

The application discloses a method for suppressing ghost waves of a streamer based on frequency-slowness domain continuation and ghost wave parameter optimization. Considering that ghost wave parameters vary with time and space and affect the ghost wave removal effect, first, the marine seismic data is divided by using a sliding time window to reduce the influence of the time variation of the ghost wave parameters; the delay time and amplitude difference coefficient of the ghost wave and the primary wave are enumerated alternately; the data in the time window is continued by using a frequency-slowness domain wave field continuation operator, and then the original marine seismic data is added and subtracted by the continued record; the sum of the absolute values of the products of the new records obtained by operation is taken as the target, the optimal ghost wave delay time and amplitude difference coefficient are iteratively searched, and then the ghost wave is suppressed; after the data in each window is suppressed, all the window data are integrated into a complete record. The method can effectively suppress the ghost wave, widen the frequency band and improve the resolution of the seismic data.

The application discloses a gain amplifier based on multi-stage gain, and relates to the field of amplifiers.The gain amplifier comprises an input signal processing circuit, a first-stage gain circuit, a second-stage gain circuit, a third-stage gain circuit, and an output signal processing circuit.The input signal processing circuit is used for processing an input signal.The first-stage gain circuit is used for gain amplification processing of the signal processed by the input signal processing circuit to obtain a first signal.The second-stage gain circuit is used for gain amplification processing of the first signal to obtain a second signal.The third-stage gain circuit is used for gain amplification processing of the second signal to obtain a third signal.The output signal processing circuit is used for outputting the third signal after processing.The feedback circuit is used for adjusting the gain amplification processing effect of the first-stage gain circuit, the second-stage gain circuit and the third-stage gain circuit.The application can improve the gain of the gain amplifier, improve the linearity and bandwidth of the gain amplifier, and effectively control the size and cost of the gain amplifier.

The invention relates to a high-speed signal transmission device and method, and belongs to the technical field of signal transmission, the device comprises a fixing support, a high-speed cable and an adjustable fixing device, the fixing support is provided with a limiting hole of a cable connector with a preset size, one end of the high-speed cable is connected with the cable connector, the other end of the high-speed cable is connected with a board card connector, and the board card connector is connected with the fixing device. The board card connector is connected with a board card, the fixing device is arranged in the fixing support and corresponds to the test board in size, and the fixing device fixes the test board. The device improves the signal transmission efficiency, stability and flexibility.

The invention provides a low-loss microstrip transmission line based on substrate stacking and bonding. The low-loss microstrip transmission line comprises an upper carrier plate layer, a hollow transmission layer, a lower carrier plate layer, a first bonding layer and a second bonding layer, a first metal layer is arranged on the lower surface of the upper carrier plate layer, and a second metal layer is arranged on the upper surface of the lower carrier plate layer; the first metal layer, the second metal layer and the hollow-out area of the hollow-out transmission layer jointly form a transmission area; electromagnetic waves are propagated in the transmission area in a quasi-TEM mode form; the upper carrier plate layer, the first bonding layer, the hollow transmission layer, the second bonding layer, the second metal layer and the lower carrier plate layer are stacked and bonded in parallel in sequence; and therefore, the interlayer is tightly bonded, the structure is flat and stable, and displacement and height change between the layers are avoided. The invention has the advantages of low cost and low loss, and is suitable for the field of microwave communication transmission. In addition, the antenna also has the characteristics of easy processing, high integration and wide frequency band, so that the antenna is widely applied to scenes using a multilayer board integration technology.

The present invention relates to a space electromagnetic energy collection system based on a planar logarithmic periodic antenna, and belongs to the field of electromagnetic technology. The system includes an improved planar logarithmic periodic antenna, an impedance matching rectifier unit and a power management unit; wherein the improved planar logarithmic periodic antenna is used to receive radio frequency signals in the 0.5GHz-3GHz frequency band in the environment; the impedance matching rectifier unit is connected to the improved planar logarithmic periodic antenna, wherein the impedance matching part realizes the maximum acquisition of the received signal, ensures that each link of the system maintains a standard impedance of 50 ohms, and the rectifier and filter part is composed of a transmission line, a fan-shaped branch and a diode rectifier array, and performs "signal-energy" conversion; the present invention improves the electromagnetic energy collection efficiency, can effectively extend the standby time of the Internet of Things terminal, and can solve the self-power supply problem of the ultra-low power consumption Internet of Things terminal, and has broad application prospects in the field of the Internet of Things.

The invention relates to a half-wave oscillator antenna device based on a reflection cavity structure and an adjusting method thereof, the device comprises a copper-clad plate reflection cavity, a half-wave oscillator antenna, a microstrip feeder line, a copper-clad plate, an SMA interface and a reflection cavity bottom surface, the copper-clad plate reflection cavity is connected with the peripheral edge of the reflection cavity bottom surface to form a semi-closed cavity with an opening facing one side; the bottom surface of the reflection cavity is provided with a through hole matched with the SMA interface, one side of the copper-clad plate is connected with the bottom surface of the reflection cavity, the half-wave oscillator antenna and the microstrip feeder line are both arranged on the surface of the copper-clad plate, and one end of the half-wave oscillator antenna is connected with the SMA interface through the microstrip feeder line. Compared with the prior art, the antenna has the advantages that the structure is simple, wave beams can be more concentrated under the condition that the bandwidth of the antenna is not affected, and therefore the high-gain effect of the antenna is achieved.

The utility model discloses a microstrip patch antenna which comprises a dielectric substrate and a radiation patch. The radiation patch is arranged on the dielectric substrate, the radiation patch is E-shaped, the parallel edge of the E-shaped radiation patch is defined as a first sub-radiation patch, the vertical edge of the E-shaped radiation patch is defined as a second sub-radiation patch, and the length of the first sub-radiation patch is larger than or equal to 2.1 mm and smaller than or equal to 2.5 mm. The E-shaped structure enables the current to bypass between the first sub radiation patch and the second sub radiation patch, which is equivalent to increasing the electrical length of the radiation patch and reducing the resonant frequency of a fundamental mode, so that the low-frequency band bandwidth is broadened; the edges of the first sub-radiation patch and the second sub-radiation patch can generate strong electromagnetic field coupling to excite an additional parasitic resonance mode, so that the frequency band is further widened, and the bandwidth of the microstrip patch antenna is effectively widened. Wherein the first sub radiation patch of 2.1 mm to 2.5 mm enables the resonant frequency of the microstrip patch antenna to range from 43.7 Ghz to 55.1 Ghz, the relative bandwidth is 23%, and high bandwidth is achieved.

The application provides an antenna system and an electronic device. The antenna system comprises at least three first radiators and at least one second radiator. At least one of the at least three first radiators can emit a preset low-frequency signal. All the first radiators can at least receive the preset low-frequency signal. At least one second radiator is coupled with at least one first radiator through a coupling gap. The minimum value of the frequency band supported by the second radiator is greater than or equal to the maximum value of the frequency band of the preset low-frequency signal. The antenna system and the electronic device provided by the application can support more frequency bands and improve the coverage width and depth of low-frequency signals.

The present invention discloses a microwave photon phased array receiving beam forming network, comprising: a plurality of optical channels, each optical channel comprising a laser, a front-end electro-optical intensity modulator, an erbium-doped fiber amplifier and an optical true delay unit connected in sequence; the output end of the optical true delay unit is connected to the input end of a wavelength division multiplexer; the output end of the wavelength division multiplexer is connected to the input end of a 1×2 optical power splitter, the output end of the 1×2 optical power splitter is connected to two optical links, each optical link comprises a rear-end electro-optical intensity modulator and a photodetector connected in sequence, and the output ends of the two photodetectors are connected to the input end of an electrical signal differentiator 9. The microwave photon phased array receiving beam forming network disclosed by the present invention can down-convert all received signals using a single local oscillator at the rear end of the forming network, without the need to perform coherent distribution of clock and local oscillator signals at the front end of the array, thereby reducing the weight and structural complexity of the array.

The invention belongs to the technical field of vibration reduction metamaterial structure design, and aims to solve the problem of poor vibration reduction effect in metamaterial structure design. The invention provides a dual-mass resonator structure, a design method and a shape and function fused metamaterial structure, the dual-mass resonator structure comprises a plurality of connected cell structures, and two adjacent cell structures are connected through a cell outer frame; the double-bridge-arm structure comprises two bridge arms which are led out from the inner frame of the cell element outer frame to the inner side; the dual-mass structure comprises two groups of local resonant columns, and one group of local resonant columns is arranged at one end, far away from the cell outer frame, of any bridge arm; and meanwhile, a shape and function fused metamaterial with a customizable vibration isolation belt is designed and prototype, and various metamaterial shapes are integrated into different functional frames by the structure, so that the coherent design of forms and functions is realized. By utilizing the characteristics of the metamaterial, the vibration and noise reduction performance of the structure is effectively improved.

The invention discloses a four-corner snakelike bridge broadband electromagnetic band gap structure, and belongs to the technical field of circuit microwaves. According to the structure, complementary split-ring resonator shape etching is carried out at the center, and the snake-shaped bridge structures are arranged between the adjacent units, so that the inductance between the electromagnetic band gap units is increased, low-frequency-band SSN is effectively suppressed, the bandwidth is relatively wide, and SSN of a stop band can be effectively suppressed. The four sides of the EBG structure are etched into rectangles, and adjacent elements are connected to form a bridge. Compared with a traditional L-bridge structure, the S-shaped structure is designed, so that the surface current path can be increased, and the equivalent inductance and the equivalent capacitance are increased. The gap between the resonant rings generates a gap current and generates a resonant circuit, so that the cut-off frequency can be effectively reduced and the width of a stop band can be improved. The ultra-wide band gap structure takes the suppression depth of-30dB as a standard, can reach an ultra-wide band gap of 23.8 GHz, is obviously superior to a conventional electromagnetic band gap structure, and can better suppress the noise of a synchronous switch.

The present application provides a kind of vibration power generation element, can substantially reduce the parasitic capacitance possibly generated in vibration power generation element, thereby can expand the frequency band that can be generated.A kind of vibration power generation element, characterized in that, with: fixed electrode, it has multiple comb-shaped electrodes;Movable electrode, it has multiple comb-shaped electrodes with the fixed electrode interlock;And elastic support part, it makes the movable electrode relative to the fixed electrode in the same plane on the predetermined direction relative movement, in the state of at least one of the fixed electrode and the movable electrode is electrified, the fixed electrode and the engagement length of the movable electrode and the deflection of the elastic support part are same, or the fixed electrode and the engagement length of the movable electrode is less than the deflection of the elastic support part.

The invention discloses a band-pass filter, and relates to the technical field of filters, the band-pass filter comprises an upper metal layer, a dielectric substrate and a lower metal layer, the dielectric substrate is clamped by the upper metal layer and the lower metal layer to form a single-layer substrate integrated waveguide cavity structure, the upper metal layer, the dielectric substrate and the lower metal layer are respectively provided with a plurality of through holes which are opposite to each other to form two 1 / 4 mode substrate integrated waveguide resonant cavities, and the through holes which share the same edge of the two 1 / 4 mode substrate integrated waveguide resonant cavities serve as coupling windows of the two 1 / 4 mode substrate integrated waveguide resonant cavities. Two adjacent micro-strip resonators are arranged at the tops of coupling windows of the two 1 / 4 mode substrate integrated waveguide resonant cavities of the upper metal layer, and the two 1 / 4 mode substrate integrated waveguide resonant cavities and the two micro-strip resonators jointly achieve four-order filter response but only occupy the circuit area of the two 1 / 4 mode substrate integrated waveguide resonant cavities. The band-pass filter is small in size, simple in structure and wide in passband.

The embodiment of the application provides a kind of sound box, the shell of sound box includes two kinds of cavities, first cavity is installed with first loudspeaker, second cavity is installed with second loudspeaker.The first cavity is resonant design, cooperates with the first loudspeaker, both reduce cavity volume and expand low frequency, the first loudspeaker's damping parameter is greater than 3 and greater than second loudspeaker.R=(m*S S ) / D, R is damping parameter, m is the vibrating mass of loudspeaker, S S is the compliance of loudspeaker, D is the aperture of loudspeaker.The second cavity is lightweight design, cooperates with the second loudspeaker, expands high frequency.The organic combination of two kinds of cavities greatly expands the frequency band of sound box, so that small sound box can also emit shocking sound, and can make the volume of large sound box significantly reduced.

The application discloses an S-band reflective phase shifter based on a cross-coupling line coupler, and belongs to the fields of wireless communication and digital signal processing. The reflective phase shifter is designed based on the cross-coupling line coupler, has the advantages of small size, low insertion loss and wide bandwidth compared with existing branch line couplers and Langer couplers, can replace the digital phase shifter used by a traditional phased array antenna, and solves the problems of high cost and high power consumption of the traditional phased array antenna. In addition, the reflective phase shifter can be integrated on a PCB, has the advantages of easy processing, low cost and small size, is easy to be integrated with a planar printed phased array antenna, and realizes the miniaturization and low cost of the phased array antenna.

The present invention discloses a broadband high-aperture efficiency planar reflection array. The present invention includes a horn feed and a planar reflection array. The horn feed is located directly above the center of the planar reflection array, and the emission center axis of the horn feed is perpendicular to the plane where the planar reflection array is located; the reflection array performs phase compensation on the electromagnetic signal radiated by the horn feed; the phase center of the horn feed coincides with the focus of the planar reflection array antenna. The planar reflection array includes a plurality of reflection units, and the horn feed generates an irradiation wave. Before and after the horn feed irradiates, the phase distribution of the plurality of reflection units on the planar reflection array remains unchanged. When the horn feed irradiates, the planar reflection array can generate a beam with a higher gain in a wide frequency band, achieving a broadband high-aperture efficiency effect. The planar reflection array of the present invention is a single-layer planar structure with a low profile, a wide bandwidth, a high aperture efficiency, and simple manufacture. It has broad application prospects in the fields of long-distance wireless communications such as radars and satellites.

The utility model provides a transformer output matching circuit, a radio frequency front-end module and a wireless communication module, which comprise a control switch, a filter circuit, a first transformer and a signal amplification and matching network which are integrated into a whole, the size of the radio frequency front-end module integrated by the transformer output matching circuit and the signal amplification and matching network is smaller than the size of a radio frequency switch and a filter which are independently designed, the harmonic power requirement of the radio frequency front-end module can be met, the module required by radio frequency emission is simplified, and the miniaturization of the radio frequency front-end module is realized.

The present application relates to a kind of multifunctional composite fabric with wave-absorbing, flame-retardant, ultraviolet absorption and a preparation method thereof.In the present application, by material intrinsic design and structure control, the synergistic technology of realizing wave-absorbing, flame-retardant, ultraviolet-resistant and other multiple functions integrated in fabric substrate under low filler addition amount is obtained.

The invention discloses a dielectric remodeling-based broadband wide-angle scanning phased-array antenna unit and antenna, and belongs to the technical field of antenna engineering, and the antenna unit comprises a metal floor, a dielectric layer, a microstrip layer, a dielectric loading layer, a parasitic layer, an air slot, a metal column, a metal wall, a concave metal baffle plate and a coaxial feed which are sequentially stacked, the concave metal baffle is connected with the metal floor, a rectangular microstrip is printed on the microstrip layer, the rectangular microstrip is connected with the coaxial feed to form L-shaped feed, rectangular electric dipoles are printed on the two sides of the rectangular microstrip, one end of each rectangular electric dipole is connected with the metal floor through a metal column, and the other end of each rectangular electric dipole is connected with the coaxial feed. The other end of the rectangular electric dipole is connected with the metal wall, the length of the metal wall is equal to that of the long side of the rectangular electric dipole, and the length direction of the metal wall is parallel to that of the long side of the rectangular micro-strip. The phased-array antenna has the characteristics of low profile, broadband, wide-angle scanning impedance matching and stable radiation.

The invention discloses a diffracted wave impedance inversion method and device, electronic equipment and a medium. The method comprises the following steps: carrying out recursive inversion on diffracted wave seismic data in a time domain to obtain diffracted wave relative impedance; converting the time domain interval velocity into interval velocity low-frequency impedance of the time domain; adding the diffracted wave relative impedance of the time domain and the layer velocity low-frequency impedance to obtain diffracted wave band-limited impedance; diffracted wave band-limited impedance and interval velocity low-frequency impedance of the time domain are converted into a frequency domain; diffracted wave absolute impedance of the frequency domain is obtained; and converting the diffracted wave absolute impedance of the frequency domain to obtain time domain diffracted wave absolute impedance. According to the method, the interval velocity is converted into the interval velocity low-frequency impedance through the conversion relation between the logging velocity and the impedance, and the interval velocity low-frequency impedance is fused with the relative impedance of diffracted wave recursion inversion in the frequency domain, so that the frequency band of diffracted wave impedance is widened, and the wave impedance inversion precision of the heterogeneous reservoir is improved.

The present invention discloses an L-shaped connecting beam acoustic emission device and a preparation method thereof. The acoustic emission device comprises, from bottom to top, a substrate layer, an alternating dielectric layer and a metal layer, and a passivation layer. A rectangular cavity is etched on the nth dielectric layer, a rectangular diaphragm, an L-shaped connecting beam and an upper electrode are formed on the top of the cavity, and a lower electrode is formed at the bottom of the cavity. During preparation, the back end (BEOL) layer of the COMS process is used as the structural layer of the MEMS device, the COMS electronic layer is integrated below the MEMS device layer, the metal layers are interconnected by tungsten plugs, and finally a rectangular cavity, a rectangular diaphragm and an L-shaped connecting beam are formed by etching. The L-shaped connecting beam acoustic emission device of the present invention has the advantages of good reliability, small size, high sensitivity, low manufacturing cost, and easy mass production.