12results about How to "Bandwidth" patented technology

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 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 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 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 invention provides an electronic device. The electronic equipment comprises a front shell, a floor and an antenna assembly, the front shell comprises a frame part, the floor comprises a first edge and a second edge which are connected in a bending manner, 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 long side of the floor, 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 main radiating body and the first parasitic radiating body are positioned on the frame part; the first feed source is electrically connected to the first feed point, excites a first resonant mode to support a first sub-band of a first target band, and a second resonant mode to support a second sub-band of the first target band, the first resonant mode including a parasitic mode of the first parasitic radiator, and the second resonant mode including a zero-order mode of the floor.

This invention belongs to the field of radio frequency integrated circuit technology and discloses a stacked broadband radio frequency amplifier and its wireless transceiver circuit. The stacked broadband radio frequency amplifier includes an input impedance matching network, a first stacked amplifier circuit, a second stacked amplifier circuit, and an output impedance matching network. The input terminal of the input impedance matching network serves as the input terminal of the stacked broadband radio frequency amplifier and is connected to the radio frequency signal input terminal. The output terminal of the input impedance matching network outputs the radio frequency signal to the first stacked amplifier circuit. After receiving the radio frequency signal, the input terminal of the first stacked amplifier circuit outputs a first-stage amplified radio frequency signal. After receiving the first-stage amplified radio frequency signal, the first stacked amplifier circuit further amplifies and outputs a second-stage amplified radio frequency signal. The input terminal of the output impedance matching network receives the second-stage amplified radio frequency signal and outputs the amplified radio frequency signal. The amplifier structure of this invention is simple and has excellent high power output, low phase distortion, and wide temperature stability.

The utility model belongs to the technical field of waveguides, and discloses a millimeter wave waveguide phase shifter, which comprises a waveguide body, a phase shifting metal sheet and a driving piece, the waveguide body is provided with a waveguide cavity extending in a first direction, the waveguide body is further provided with an installation cavity, the installation cavity is located on one side of the waveguide cavity, and the installation cavity is communicated with the waveguide cavity; two ends of the phase shift metal sheet are fixed in the mounting cavity, and the phase shift metal sheet has a deformation degree of freedom; and the driving part extends into the mounting cavity from the outside of the waveguide body to abut against the middle part of the phase-shifting metal sheet, the driving part acts along a second direction to drive the phase-shifting metal sheet to deform, and the second direction is perpendicular to the first direction. The antenna has the advantages of being simple in structure, small in size, convenient to process and wide in bandwidth.

This invention belongs to the field of airgun source technology in shallow sea seismic exploration, and discloses a method and application for widening the frequency band of airgun source wavelets through three-dimensional arrangement and delayed excitation. By calculating the immersion depth of airguns of different capacities and the time to reach the peak value of the main pulse after excitation, and then adjusting the immersion depth and excitation time of airguns of different capacities based on the calculated time, the time shift corresponding to the peak value of the main pulse of each airgun of different capacities in the airgun array is achieved. This ultimately constructs a narrower main pulse waveform for the airgun array's sharp pulse source wavelet, thus widening the frequency band of the source wavelet. By adjusting the immersion depth and excitation time of airguns of different capacities to construct sharp pulse wavelets and suppressing virtual reflections, this invention achieves the goal of extending the frequency band of the airgun array to lower frequencies while maintaining high frequencies, ultimately obtaining an airgun source with rich high and low frequency frequencies and strong energy transmission capability for mid-to-deep geological targets.

This invention discloses a graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres and its preparation method. First, a reduced graphene oxide aerogel is prepared using graphene oxide as a raw material. Then, hollow Fe3O4 magnetic nanoparticles are prepared via a hydrothermal method using FeCl3·6H2O and ammonium acetate as raw materials. Finally, Fe3O4 / PPy / reduced graphene oxide aerogel is prepared by in-situ polymerization, and the graphene aerogel supported on Fe / N co-doped hollow carbon nanospheres is obtained through high-temperature heat treatment. The graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres of this invention exhibits excellent dielectric and magnetic losses. Simultaneously, the magnetic Fe nanoparticles in the material can effectively convert electromagnetic wave energy, achieving excellent microwave absorption performance, and showing great potential in next-generation cutting-edge advanced nanocomposite materials.

The invention relates to the technical field of analog-to-digital converters, in particular to a sampling time error background calibration method for a time-interleaved analog-to-digital converter, which comprises a feed-forward compensation unit, a feedback compensation unit and a judgment unit, and is characterized in that during initialization, the feed-forward compensation unit is directly used for compensating sampling data of each channel; after each time of compensation, a judgment unit is adopted to judge whether the time mismatch error estimation value is larger than a set threshold value or not, if yes, a feed-forward compensation unit is adopted for next compensation, and otherwise, a feedback compensation unit is adopted for compensation. According to the method, when the cross-correlation function is calculated, the operation complexity is effectively reduced through the moving average filter, and the resource consumption during hardware implementation is equivalently reduced.

The invention discloses a core-shell type high-loss ferrite electromagnetic material and a preparation method thereof, the core-shell type high-loss ferrite electromagnetic material comprises a shell layer and a core layer, the shell layer is a carbon sphere, the core layer is an M-Ba ferrite material, and the mass ratio of the shell layer to the core layer is 1: (5-15); the molecular formula of the M-Ba ferrite material is BaFe < 12-x > Al < x > O < 19 >, wherein x is equal to 0.0 to 1.0. The characteristics of high-frequency application, high-temperature resistance, process stability and the like of BaFe < 12-x > Al < x > O < 19 > ferrite are utilized, the carbon spheres prepared from potato starch are combined for core-shell compounding, and the composite material has high loss constant and high temperature stability in a high-frequency band and can meet the application requirements of electromagnetic shielding and electromagnetic loss under high frequency.