234results about How to "Increased bandwidth" patented technology

Method for controlling an input impedance of an antenna (100). The method can include the steps of coupling RF energy from an input RF transmission line (106) to an antenna radiating element (102) through an aperture (112) defined in a ground plane (110). For example, the aperture (112) can be a slot and the radiating element (102) can be a patch type element. The input impedance can thereafter be controlled by selectively varying a volume or a position of a conductive fluid (128) disposed in a predetermined region between the RF transmission line and the antenna radiating element. The volume of conductive fluid (128) can be automatically varied in response to at least one control signal (132).

In a first aspect, a lithography apparatus may comprise a mask designed using optical proximity correction (OPC), a pulsed laser source, and an active bandwidth control system configured to increase the bandwidth of a subsequent pulse in response to a measured pulse bandwidth that is below a predetermined bandwidth range and increase a bandwidth of a subsequent pulse in response to a measured pulse bandwidth that is above the predetermined bandwidth range. In another aspect an active bandwidth control system may include an optic for altering a wavefront of a laser beam in a laser cavity of the laser source to selectively adjust an output laser bandwidth in response to the control signal. In yet another aspect, the bandwidth of a laser having a wavelength variation across an aperture may be actively controlled by an aperture blocking element that is moveable to adjust a size of the aperture.

The present invention provides a spread spectrum clock generator that is capable of preventing phase jumps and jitters and suppressing the occurrence of Electro Magnetic Interference components and that can easily be applied to large scale integrated circuits. The spread spectrum clock generator can be configured with a filter, quantizer, fractional divider, and other elements. Also, this clock generator circuitry can be configured by combination of a delta-sigma ΔΣ quantizer and factional divider so that sine wave modulation and random number modulation can be realized. Thereby, control with digital values can be performed. This clock generator prevents precipitous phase variations in the output high frequency clock and makes fine phase control possible. Consequently, EMI reduction by 20-30 dB can be expected.

The invention discloses a method for improving offshore seismic data resolution by utilizing air gun seismic focuses of different depths. The method is characterized in that air guns are respectively arranged in positions of different depths to be excited, the near-field wavelet of each seismic focus is recorded, and a far-field wavelet is obtained through simulation; and because of the existence of an offshore strong wave impedance interface, trap points occur on the frequency spectrum of each far-field wavelet, the high-frequency information of air gun seismic focuses at superficial parts is rich, the low-frequency advantages of seismic focuses at deep parts are obvious, and periodic extension is formed. The spectral analysis is carried out on the far-field wavelets to determine the dominant frequency band of each wavelet, the high-frequency dominant section of the wavelet at a superficial part is kept unchanged, the far-field wavelet of the seismic focus at a deep part is expected to be output only at the low-frequency end, and a frequency division matched filter is obtained by calculation and then is applied to all seismic records acquired by the air gun seismic focuses at the superficial parts, thereby realizing the combination of advantages of wavelets of seismic focuses in two different depths, widening the frequency band of the offshore seismic data and improving the resolution.

A contact structure for creating the electric connection with the object on the substrate to be tested has the TAB form using spherical contactor as contact point. It has more contactors formed by the conductive line on the grounding layer and passing through the dielectric layer, and a substrate for fixing said contactors on it and electrically connecting them to external part. The said conductive line is a microstrip line with a hard boss at its end. When the contact structure is pressed on the substrate to be tested, it is curved to contact with the said boss with a friction effect.

The UHF detection equipment for local discharge in gas insulated combined electric appliance consists of seven parts of gas insulated combined electric appliance, leaked electromagnetic wave, UHF ultrawideband vibrator antenna sensor, coaxial RF cables, amplifying filter, high speed digital sampler, bus and computer. The present invention has effectively increased UHF detecting bandwidth and raised detecting sensitivity and S/N ratio, so that it can obtain accurate local discharge information. The present invention may be used widely in insulation state monitoring of gas insulated high voltage equipment with SF6 breaker, gas insulated cable, etc.

The invention discloses an arc voltage testing device of a pantograph catenary system. The device consists of a parallel resistance capacitive-type voltage divider, an isolation amplifier, a data acquisition card and a computer, wherein the parallel resistance capacitive-type voltage divider acquires a potential of a catenary system during off-line of the pantograph catenary system and a potential of a current-collecting pantograph sliding plate respectively, and then inputs the potential difference of the two voltage division points to the isolation amplifier for performing isolation amplification, the data acquisition card collects a voltage outputted from the isolation amplifier after isolation amplification and transmits the voltage to the computer, and the computer processes the voltage to obtain the arc voltage of the pantograph catenary system. The arc voltage testing device has strong anti-jamming capability, increases the range of tested frequency band, reduces the phase difference, and can accurately measure the arc voltage of the pantograph catenary system.

The invention discloses a multi-rotor unmanned aerial plane navigation positioning system, comprising a ground positioning base station system, a ground measurement and control system and a multi-rotor unmanned aerial plane aircraft. The ground positioning base station system is used for sending difference positioning information; the ground measurement and control system receives the difference positioning information, combines the difference positioning information into remote control frames, and sends the remote control frames into the multi-rotor unmanned aerial plane aircraft; the multi-rotor unmanned aerial plane aircraft receives the remote control frames and utilizes the remote control frames to perform difference calculation to obtain positioning data; meanwhile, the positioning data is combined into remote control frames, and the remote control frames are sent to the measurement and control system to obtain high precision position information. The multi-rotor unmanned aerial plane navigation positioning system can meet multi-task requirements on accurate positioning, possess a stronger anti-interference capability, and solve the disadvantages of large positioning measurement errors and susceptibility to interference of present test systems.

The invention relates to an offshore streamer broadband wide-azimuth seismic exploration method. The offshore streamer broadband wide-azimuth seismic exploration method comprises the following steps of: establishing a three-dimensional seismic geologic model suitable for a stratigraphic structure of a target area, based on geological horizon, rock velocity and density data of the target area for previous offshore seismic exploration; optimizing the type of a wide-azimuth observation system and the aspect ratio of streamers, so as to obtain a wide-azimuth observation system type and a streamer aspect ratio that are suitable for the target area; optimizing three-dimensional curved streamer parameters, so as to obtain optimized three-dimensional curved streamer shape and streamer parameters; optimizing multi-point depth-variable random delay excitation parameters, so as to obtain excitation delay time series distribution corresponding to each synchronous source during excitation at different excitation points; in the target area, carrying out actual offshore streamer broadband wide-azimuth seismic acquisition by the three-dimensional curved streamers during multi-point depth-variable random delay excitation, so as to obtain actual acquisition mixed source shot gather records for the series of multi-point depth-variable random delay excitation.

The invention discloses a high-power laser diffraction type spatial filter. The left side of the high-power laser diffraction type spatial filter is provided with an interstage isolation filter of which the central axis is a vertical line BC, the middle of the high-power laser diffraction type spatial filter is provided with a group of gain medium of which the central axis is a transverse line CD, the right side of the high-power laser diffraction type spatial filter is provided with a multi-pass cavity filter of which the central axis is a vertical line DE, the central axis of the entire device forms a BCDEF broken line, one optical grating which enables light beams to be deflected at 90 degrees is respectively arranged at a point B, a point C, a point D and a point E, the optical gratings are separate type volume Bragg optical gratings or double-piece integrated type optical gratings, and one reflecting mirror is arranged at a point F. The invention uses an optical grating double-pass spatial filter component which does not have a lens and a pinhole and has compact appearance to replace a pinhole filter in a multi-pass amplifier, can realize the wider width of a diffraction frequency band and can meet the requirement of short-pulse and ultrashort-pulse spatial filtering; the borne laser power is higher, and the requirement of high-power laser spatial filtering can be met, thereby eliminating the probability that laser burns out the filter component because of no lens and no pinhole in the device.

A bandwidth boost system is disclosed that increases the bandwidth to a client by transmitting data over both a wireline communication path and a wireless communication path. A control system receives a request from the client over the wireline communication path for a first and second data set. The control system processes the request to generate first and second transmit instructions. The control system transfers the first data set and the first transmit instructions to a wireline transfer system and transfers the second data set and the second transmit instructions to a wireless transfer system. The wireline transfer system transmits the first data set to the client over the wireline communication path. The wireless transfer system establishes the wireless communication path with the client and transfers the second data set to the client over the wireless communication path.

The invention discloses a flexible photoinduced ultrasonic thin film transducer and a preparation method thereof. The ultrasonic thin film transducer comprises a flexible transparent substrate (120),a light absorbing layer (130) and a thermos-elastic layer (140) from top to bottom in sequence. The flexible transparent substrate (120) is transparent polydimethylsiloxanepolymers; the light absorbing layer (130) is carbon nanotubes; and the thermo-elastic layer (140) is polydimethylsiloxane polymers. The preparation method of the flexible photoinduced ultrasonic thin film transducer comprises the steps that a glass substrate is spin-coated with a polydimethylsiloxane agent, and the flexible transparent substrate is prepared; an aluminum oxide inorganic screening film deposited with a carbonnanotube filter cake is pressed onto the transparent polymer thin film prepared in the second step, the aluminum oxide inorganic screening film is peeled off, and a carbon nanotube thin film transferred with the light absorbing layer is obtained on a transparent polymer substrate; and a carbon nanotube thin film layer is spin-coated with the polydimethylsiloxane polymers, and the thermos-elastic layer is formed after solidification. After the thermo-elastic layer is solidified, the glass substrate is peeled off.

The invention discloses a frequency-adjustable and power-tunable terahertz avalanche oscillator. An oscillation cavity of the terahertz avalanche oscillator is formed by combining an upper cavity body and a lower cavity body, wherein a waveguide slot is formed in the top surface of the cavity body of the lower cavity body, and the waveguide slot is combined with the upper cavity body to form a standard waveguide cavity; an avalanche diode is assembled in a waveguide cavity in the center of the top surface of the lower cavity body through a tube base assembly thimble, the high and low positions of the avalanche diode in the waveguide cavity can be adjusted through rotating the tube base assembly thimble, and the avalanche diode is fixed through a locking nut after being adjusted in position; a spring thimble, a spring and a tunable cap disc are sequentially mounted in a tuning plunger from top to bottom, the tuning plunger assembled with the tunable cap disc, the spring and the spring thimble is screwed from an upper cavity pressure block to directly reach the waveguide cavity, and the spring enables the tunable cap disc to constantly keep physical contact with the avalanche diode in different high and low positions; the position of the tuning plunger is fixed through a piston locking nut.

The invention discloses a broadband micro-strip antenna, which belongs to the technical field of antenna. The antenna consists of a transmission feeder, a composite right/left-handed nonlinear transmission line and a medium substrate, wherein the composite right/left-handed nonlinear transmission line is connected with the medium substrate, and the transmission feeder is connected with the composite right/left-handed nonlinear transmission line. The composite right/left-handed nonlinear transmission line is formed by alternately and serially connecting at least one left-handed nonlinear transmission line and one right-handed nonlinear transmission line; the left-handed nonlinear transmission line consists of a series variable capacitor and a parallel inductor; and the right-handed nonlinear transmission line consists of a series inductor and a parallel variable capacitor. The broadband micro-strip antenna uses the composite right/left-handed nonlinear transmission line to substitute a metal conductor slice on the prior micro-strip antenna, the left-handed nonlinear transmission line has high-pass characteristic, the right-handed nonlinear transmission line has low-pass characteristic, and the composite right/left-handed nonlinear transmission line has band-pass characteristic and greatly expands the bandwidth of the micro-strip antenna.

The invention discloses a shape memory alloy spring vibration absorber containing a collision damping energy-dissipating device. The shape memory alloy spring vibration absorber comprises a vibration absorber main body and a limiting device, wherein the vibration absorber main body comprises a fixed frame, a first spring, a second spring, a mass block and a guide pillar; the two ends of the guide pillar are respectively connected with the top end and bottom end of the fixed frame; the first spring, the mass block and the second spring are successively sleeved on the guide pillar; the limiting device comprises an upper limiting part and a lower limiting part; the upper limiting part is located between the top end of the fixed frame and the mass block; the upper limiting part comprises a first limiting block, a first limiting spring and an upper limiting damper; the lower limiting part is located between the bottom end of the fixed frame and the mass block; the lower limiting part comprises a second limiting block, a second limiting spring and a lower limiting damper. The shape memory alloy spring vibration absorber can meet the vibration control requirements of different main body structures and can greatly increase the vibration absorbing effect of the vibration absorber.

The low noise amplifier includes one first transistor, one second transistor, inductor and resistors. The inductor is connected between the RF output node and the work voltage, and the RF output node has capacitor, and the capacitor and the inductor make the low noise amplifier possess resonant frequency 1.5 times higher than the operation frequency, with the capacitor being parasitic capacitor of the RF output node or common capacitor. The low noise amplifier is connected to independent earthing passage, which provides parasitic inductance via the chip soldering lines.

The embodiment of the invention discloses a device for improving the transmission bandwidth. The device comprises a signal transmission line, lateral rimlands positioned at two sides of the signal transmission line and capacitors arranged between the signal transmission line and the lateral rimlands, wherein the signal transmission line is a microstrip line; and the signal transmission line and the lateral rimlands commonly form a mode of coplanar waveguide transmission line. On a transmission channel connected through wire bonding, the capacitors are arranged between the signal transmission line and the lateral rimlands, and a resonance point in the frequency band is formed on a frequency domain by using the perception characteristic shown by the wire bonding and an LC resonance circuit consisting of the wire bonding and the capacitors connected with the wire bonding in parallel, so that the rising trend of a return loss curve is forced to be postponed, the frequency bandwidth can be expanded, and the bandwidth of the transmission channel of the RF signals can be expanded.

A dynamic random access memory circuit including a memory plane composed of an array of memory cells arranged in lines and columns, and a line decoder, each line of said memory plane corresponding to a page of words. Two buffer registers are coupled with the memory plane to read words in a page of the memory and/or writing new words to a page of the memory and the registers are used alternatively to access this memory plane. The buffer registers are dual-port memories and, moreover, the memory comprises an error correcting circuit allowing read-modify-write cycles applied to a group of n words within the same page. Whereby the reliability of the memory circuit is substantially increased and, moreover, an alternative solution to burn-in can even be offered. The invention also provides a method for controlling a dynamic memory having an error correcting code mechanism.

The invention discloses a memory element and a manufacturing method thereof. The memory element comprises a plurality of silicon-containing conductive layers and the plurality of silicon-containing conductive layers are parallel to each other and vertically stacked on the substrate. A plurality of serial selection lines are located over the silicon-containing conductive layers and are extending along a first direction. A plurality of serial lines are vertical to the silicon-containing conductive layers and the serial selection lines, and are electrically connected to the serial selection lines. A plurality of bit lines are located at the serial selection lines and are extending along a second direction. Multi-set and multi-layer plug structures are arranged along the first direction to respectively sandwich the plurality of serial lines between every two adjacent multi-layer plug structures. Each multi-layer plug structure is composed of a plurality of via plugs and each via plug is correspondingly connected with one silicon-containing conductive layer. The memory element further comprises a plurality of metal word lines. Each metal word line extends along the first direction and is electrically connected with one via plug connected with the same silicon-containing conductive layer.

The invention provides a dynamic software definition light access to aggregation network bandwidth adjustment method and a device. Multiple homologous homoclinic paths form a path set, and corresponding flows are distributed to the multiple paths. Through aggregation network flow monitoring, the flow distribution path quantity and the flow on each path are dynamically adjusted, not only can a request success rate and a user bandwidth satisfaction degree be improved, user experience is improved, but also a purpose of load balancing can be realized through dynamically adjusting the flow paths, and a resource utilization rate is improved.

The invention discloses a method for improving longitudinal resolution of TOFD (time of flight diffraction) detection with a Burg algorithm based autoregressive spectrum extrapolation technology, and belongs to the technical field of ultrasonic non-destructive detection. The method adopts an ultrasonic detection system comprising a TOFD ultrasonic detection instrument, TOFD probes, a scanning device, software integrating TOFD conventional analysis functions and a computer. According to the method, TOFD scanning is performed on defects, collected time-domain aliasing signals containing upper-end and lower-end diffraction waves of the defects are subjected to autoregressive spectrum extrapolation processing; the -6dB frequency bandwidth is taken as the benchmark, defect signals in the frequency band range are selected, defect signals outside the frequency band range are estimated with the Burg algorithm, so that the frequency bandwidth is broadened, the longitudinal resolution of defect detection is improved, and the defect height quantification is realized. Compared with other methods for improving the longitudinal resolution of TOFD detection, the method does not have additional requirements for a hardware system, is not limited by exciting pulse time width of the detecting probes, and has higher engineering application value.

Disclosed is a data storage device, a servo control method, and a program to reduce effects of a resonance frequency of an actuator or the like without reduction in servo control performance. A band-pass filter comprising a first all pass filter (APF) and a second adder, a second APF, and a multiplier are used to detect how much a current resonance frequency of the actuator deviates from a set value of a center frequency of the first APF, and based on a result of the detection, the center frequency of the first APF is properly adjusted. The adjustment of the center frequency of first APF enables a center frequency of a notch filter comprising the first APF and a first adder to be automatically approximated to a current resonance frequency of the actuator.

A fluid pressure support mechanism has a container in which fluid pressure is applied and fluid tubes are connected to the fluid pressure support mechanisms and to a fluid pressure control unit in such a way as to make all the fluid pressure support mechanisms communicate with each other, then a fluid pressure control unit applies the fluid pressure to the containers in the respective fluid pressure support mechanisms via the fluid tubes and controls the fluid pressure, and an electrically attractive actuator translates a mirror in an axial direction with one degree of freedom for translation by attracting force produced by a driven member and an electromagnet.

The invention discloses a multi-spherical array multiband sound source rapid orientation method, and belongs to the technical field of sound source orientation and detection. A frequency space domainmodel of a multi-spherical array sound field is established based on discrete Fourier transform; a spherical harmonic domain model of the multi-spherical array sound field is constructed based on spherical Fourier transform; the spherical harmonic coefficient corresponding to the maximum modal intensity of each spherical harmonic order is selected so as to obtain the spherical harmonic coefficientafter fusion of the multi-spherical array; the frequency-dependent component of the spherical harmonic coefficient is removed and the spherical Fourier transform component only including the angle-dependent component is obtained; the cross spectrum of the spherical Fourier transform component is constructed, the spherical Fourier transform component or the cross spectrum thereof are blocked and the estimation value of the propagator is obtained through combination of the linear regression method; an orthogonalized noise subspace is constructed based on the estimation value of the propagator,and the spatial spectrum of the direction of arrival is obtained by using mutual orthogonalization of the signal and the noise; and the incident sound source direction is scanned, and the sound sourcedirection corresponding to the maximum peak in the spatial spectrum is the direction-of-arrival angle of the sound source.

The invention discloses a reference waveform selection method based on the joint of primary and secondary envelopes in a cross-correlation method-based gas ultrasonic flowmeter. For the problem of 5 [mu]s layering of a transit time calculation value due to use of a traditional reference waveform when the gas flow speed in a pipeline is relatively high, an improved reference waveform selection method is provided. According to the method, a zero crossing point before the inverse fourth wave peak of the primary envelope of an average waveform is used as a starting point; a zero crossing point after the fourth wave peak of the secondary envelope is used as a cutoff point; a waveform between the starting point and the cutoff point is determined as a standard waveform; the rear end of the standard waveform is filled with zero, so that the number of signal points after zero filling is the same as that of collected signal sampling points when the ultrasonic flowmeter works; and a signal waveform after the zero filling of the standard waveform is determined as a reference waveform. According to the method, the problem of the layering of the transit time calculation value is solved, and themeasurement precision and the repeatability of the gas ultrasonic flowmeter are improved.