64results about How to "Change bandwidth" patented technology

The invention discloses a high bandwidth tunable double-passband microwave photon filter, belongs to the field of microwave photonics, and relates to the high bandwidth tunable double-passband microwave photon filter based on high non-linear optical fiber excited brillouin scattering effects and multiple pumping signals. The filter consists of a first laser, a first phase modulator, an opto-isolator, a vector network analyzer, a high non-linear optical fiber, a second laser, a strength modulator, a microwave signal source, a second phase regulator, a pulse code generator, an erbium-doped optical fiber amplifier, an optical circulator and a photoelectric detector. The filter is based on phase modulation and excited brillouin scattering effects caused by two pumping signals, and thus double-passband output of the microwave photon filter is achieved. By changing the frequency of the two pumping signals, the frequency of two passband centers can be randomly modulated within a certain frequency range. Through binary phase shift keying modulation on the pumping signals, the bandwidth of the pumping signals can be changed, and thus adjustment on the output bandwidth of the filter is achieved.

A device for controlling a laser therapy of the eye, including an evaluation unit that determines an intensity of a transient temperature effect by analysis of interferometric signals obtained from the eye and a control unit that controls the laser therapy, which is based on said transient temperature effect, the control unit being connected with said evaluation unit. A method for controlling a laser therapy of the eye, includes determination of the intensity of a transient temperature effect that is utilized for the control of the laser therapy, based on the effect, by analysis of interferometric signals.

A data processor which can flexibly control bandwidth settings and setting changes is provided. The data processor controls bandwidth allocation to electronic devices participating in a communication network. The data processor has a communication section used to communicate with the electronic devices and a bandwidth management section which performs control to variably allocate, based on requests from the electronic devices, bandwidths to be used for communication by the electronic devices. In cases where an additional device is added to the communication network and an adequate bandwidth cannot be allocated to the additional device, the bandwidth management section requests another electronic device transmitting video data of a resolution higher than corresponding to the user's intention to change its data format so as to allow an adequate bandwidth to be allocated to the additional device.

The invention discloses a super-surface lens antenna, and belongs to the technical field of antennas. The antenna consists of a conical-horn antenna and a wave beam focusing super-surface with the sub-wavelength thickness. The wave beam focusing super-surface is formed by a transmission-type linear polarization unit structure array with the parabolic-type cross polarization phase space distribution. The transmission-type linear polarization unit structure sequentially comprises a metal grid, a dielectric substrate, a metal elliptical opening resonant ring, a dielectric substrate and a metal grid from the bottom to the top. The size and period of the transmission-type linear polarization unit structure can change the working frequency band, bandwidth and the focusing efficiency of the wave beam focusing super-surface. According to the invention, the core component, the wave beam focusing super-surface, of the super-surface lens antenna is manufactured through the printed circuit board technology. The super-surface lens antenna is low in construction cost, employs a plane structure, has the sub-wavelength thickness, is light in weight, is small in size, is small in standing-wave ratio, is narrow in beam, is high in gain, and can be designed and implemented at any band.

The invention provides a terminal and a manufacturing method therefor. The terminal comprises an antenna and a conductive dielectric layer arranged in the terminal, wherein the conductive dielectric layer is connected with a grounding wire; and the conductive dielectric layer and a routing plane of the antenna are arranged in parallel and are isolated from each other with a set distance. According to the embodiments, the conductive dielectric layer is arranged in the terminal; the conductive dielectric layer and the routing plane of the antenna in the terminal are arranged in parallel and are isolated from each other with a set distance; a distributed capacitor can be formed between the conductive dielectric layer and the routing plane of the antenna; the antenna bandwidth can be adjusted by regulating the set distance; and the dielectric between the conductive dielectric layer and the routing plane of the antenna is air, so that loss on the terminal by the distributed capacitor can be neglected.

The present invention discloses a symmetrical extended binary phase shift keying modulation and demodulation method. By taking an extended binary phase shift keying modulation mode as the basis, the symmetrical extended binary phase shift keying modulation and demodulation method comprises a symmetrical extended binary phase shift keying (S-EBPSK) modulator and an S-EBPSK signal demodulator, the S-EBPSK modulator corrects a modulation waveform corresponding to a code element 0 relative to the EBPSK modulation, so that the code element 0 generates the phase jump symmetrical with a code element 1 at the (N/2+1)-th carrier cycle. A modulation demodulation system of the present invention has the anti-noise and anti-fading performances obviously better than an EBPSK system, overcomes the disadvantage in the EBPSK that the threshold decision can not adapt to the signal amplitude change, and saves the modules, such as an automatic gain control module, an adaptive threshold decision module, etc., thereby simplifying the structure of a receiver substantially, and having the equivalent transmission rate and frequency spectrum utilization rate with the EBPSK.

A variable resonator includes a ring-shaped conductor line (2) which is provided on a dielectric substrate (5) and has a circumferential length of a wavelength at a resonance frequency or an integral multiple of the wavelength, and at least two circuit switches (3₁, 3₂), wherein the circuit switches (3₁, 3₂) have one ends (31) electrically connected to the ring-shaped conductor line (2) and the other ends (32) electrically connected to a ground conductor (4) formed on the dielectric substrate (5), electrical connection/disconnection between the ground conductor (4) and ring-shaped conductor line (2) can be switched, and the one ends (31) of the circuit switches (3₁, 3₂) are connected to the ring-shaped conductor line (2) on different portions.

The invention discloses a multi-frequency broadband antenna based on a broadband antenna and trapped wave structure. The antenna consists of a radiator (1), a first U-shaped gap (2), a second U-shaped gap (3), a third U-shaped gap (4), a floor (5), a feeder (6) and a dielectric slab (10), wherein the radiator (1) and the feeder (6) are applied to one surface of the dielectric slab (10) by a copper applying process; the floor (5) is applied to the other surface of the dielectric slab (10) by a copper applying process; the radiator (1) and the feeder (6) are applied together; and the first U-shaped gap (2), the second U-shaped gap (3) and the third U-shaped gap (4) are etched on the radiator (1) by photoetching. By adopting the three U-shaped gaps, multi-frequency resonance of the antenna is realized, and the multi-frequency antenna can operate within the frequency ranges from 2.15GHz to 2.8GHz, from 3.15GHz to 3.85GHz, from 4.65GHz to 6.1GHz and from 6.6GHz to 8.0GHz, the central resonance frequency of the antenna is adjustable, the operating frequency of the multi-frequency antenna can be adjusted conveniently, and the shortages that the structure is complex and the resonance point cannot be easily adjusted in the conventional multi-frequency antenna design are overcome.

A preparation method of a MgO-doped ZnO sputtering target material comprises the following steps: weighing ZnO powder and MgO powder in proportion and putting the powders into a nylon ball-milling tank, adding anhydrous ethanol and agate ball, rapidly ball-milling by a planetary ball mill and obtaining mixed powder, and screening agate ball; drying anhydrous ethanol; filling a mould and heating and pressing in a high temperature furnace; and discharging and processing and slicing a target billet to obtain the target material. According to the invention, high-purity ZnO powder and MgO powder are mixed and hot-pressed to prepare the target material. The technology is simple, and cost is reduced. A luminescent material prepared by the use of the target material has uniform particles, good dispersity and excellent luminescent properties. In addition, concentration of Mg-doped ZnO is adjustable, so as to change bandwidth and wave length of green ray. The target material can be used in fields of light emitting diodes and lasers, etc. Practicality is greatly enhanced.

The invention provides a frequency band reconfigurable radio frequency receiver front end for multi-standard communication, and the receiver comprises a receiving module, in the receiving module, a low-noise amplifier receives a radio frequency signal, and carries out the low-noise amplification of the received radio frequency signal; the radio frequency switch is used for selecting a communication frequency band channel and inputting the radio frequency signal subjected to low-noise amplification into the radio frequency filter corresponding to the selected communication frequency band channel for radio frequency filtering; the radio frequency signal subjected to radio frequency filtering and a first local oscillator signal are input into a first-stage frequency converter for down-conversion, and an intermediate frequency signal is obtained; the intermediate-frequency signal is filtered and amplified through an intermediate-frequency filter and a power amplifier respectively; inputting the filtered and amplified intermediate frequency signal and the second local oscillator signal into a demodulator for demodulation to obtain a baseband I/Q signal; a baseband I/Q signal is subjected to gain control and low-pass filtering control through a variable gain amplifier and a baseband programmable filter. The method is suitable for Wi-Fi and 5G communication, has reconfigurability, and is suitable for various communication scenes.

The invention discloses a bandwidth-adjustable passive multiphase filter circuit. The bandwidth-adjustable passive multiphase filter circuit comprises a first-order filter, a second-order filter and a third-order filter which are connected in sequence, wherein the three filters are combined into a three-order passive multiphase filter. According to the bandwidth-adjustable passive multiphase filter circuit, four paths of orthogonal differential signals are received through four ports, namely, an in-phase forward input end, an orthogonal forward input end, an in-phase backward input end and an orthogonal backward input end; output ports comprise an in-phase forward output end, an orthogonal forward output end, an in-phase backward output end and an orthogonal backward output end; and the turn-on resistance of an MOS (Metal Oxide Semiconductor) transistor can be changed by adjusting a first bias voltage, a second bias voltage and a third bias voltage, so that the bandwidth of the passive multiphase filter is changed. Compared with the prior art, the bandwidth-adjustable passive multiphase filter circuit has the advantages and effects that the circuit structure is simplified, and the chip area is reduced.

A method of balancing the bandwidth of a dual-mode filter, consisting of a ring resonator produced by microstrip technology, removes strip material in one or more places on the ring resonator where the first of the two modes of the ring resonator has a maximum current intensity, and in one or more additional places on the ring resonator, where the second mode has a maximum current intensity.

The invention discloses a Hall current sensor electronic circuit which comprises a first current induction circuit, a second current induction circuit and a reference voltage circuit. The Hall current sensor electronic circuit is characterized in that the reference voltage circuit is used for providing stable voltage to input ends of the first and second current induction circuits; the first and second current inductor circuits have a consistent structure and respectively consist of a Hall element, an in-phase proportional amplification circuit and an instrument amplifier circuit; an output end of the in-phase proportional amplification circuit is connected to an input end of the Hall element; an output end of the Hall element is connected to an input end of the instrument amplifier circuit; and the in-phase proportional amplification circuit is a standard in-phase proportional amplification circuit; the instrument amplifier circuit is a standard instrument amplifier circuit; and the reference voltage circuit is a standard voltage reference circuit. The invention aims at overcoming the defects in the prior art and providing the current sensor electronic circuit which is simple in structure, practical and reliable, low in cost, small in volume and easy to operate.

The invention discloses a fast frequency hopping locking phase-locked source. The fast frequency hopping locking phase-locked source comprises a phase-locked loop circuit, a conditioning circuit and an MCU module; the phase-locked loop circuit comprises a frequency divider, a phase discrimination module, a charge pump, a loop filter module, a voltage-controlled oscillator VCO and a fractional divider; the phase discrimination module comprises a phase discriminator and an MOS switch; an input end of the frequency divider receives a reference signal; an output end of the frequency divider is connected with a signal input end of the phase discriminator; a signal output end of the phase discriminator is connected to the voltage-controlled oscillator VCO through the charge pump and the loop filter module; an output end of the voltage-controlled oscillator VCO is respectively connected with the conditioning circuit and the fractional divider; an output end of the fractional divider is connected with a feedback input end of the phase discriminator; a current input end of the MOS switch is connected to the loop filter module; a current output end of the MOS switch is grounded; and a control input end of the MOS switch is connected with the MCU module. The fast frequency hopping locking phase-locked source provided by the invention has the advantages of being low in power consumption, small in size and low in cost.

An object detection device which determines an amplitude A_r of an ultrasonic wave received by a receiving unit, detects a frequency f_r of the ultrasonic wave, sweeps a frequency f_p of a pulse signal after a predetermined time has elapsed from start of generation of the pulse signal, and determines that the received ultrasonic wave is a reflected wave of the probe wave when the frequency f_r after the amplitude A_r becomes a predetermined reference value or more from start of transmission of the probe wave makes the same change as the frequency f_p. When an ultrasonic wave received by a receiver is determined to be a reflected wave of the probe wave, the object detection unit calculates a distance to an object based on a time from transmission of the probe wave to reception of the ultrasonic wave.

The invention discloses an antenna assembly, a middle frame assembly and an electronic device, and relates to the technical field of communication. In the antenna assembly, a first radiating body is sequentially provided with a first feeding point, a second grounding point and a first grounding point in the direction from a first end to a second end, the first grounding point is electrically connected with a first tuning control circuit, the second grounding point is electrically connected with a second tuning control circuit, the first tuning control circuit and the second tuning control circuit are used for grounding, the first radiating body works from the second end to the base film of the first feeding point to generate a first resonant mode supporting a first frequency band, the first frequency band is a low frequency band, and the first tuning control circuit is used for tuning the first resonant mode to change the bandwidth of the first frequency band and improve the antenna performance of the antenna assembly.

A silicon micro-gyroscope interface circuit suitable for industrial robot attitude measurement comprises a gyroscope gauge outfit, the output end of the gyroscope gauge outfit being connected with a micro-capacitance detection module, the output end of the micro-capacitance detection module being connected with an amplification module, and the output end of the amplification module being connectedwith a band-pass filtering module, the gyroscope gauge outfit being used for outputting micro capacitance; a capacitance detection module, used for converting the micro capacitance of the gyroscope gauge outfit into voltage; an amplification module, used for amplifying the output voltage of the capacitance detection module; and a band-pass filtering module, used for filtering out noise signals out of the passband in the signals output by the amplifying module. According to the invention, bandwidth and quality factor can be adjusted, voltage signals can be controlled, a reading circuit for detecting micro capacitance signals can be completed with low noise and high precision, and attitude measurement can be accurately carried out on an industrial robot.

The invention discloses an ultra-wideband filter with multiple notch frequencies, and belongs to the technical field of electrical devices. The ultra-wideband filter is composed of a micro-strip dielectric base plate, a seven-order band-pass filter and eight arrow-shaped resonators, wherein the micro-strip dielectric base plate is 0.5-mm in thickness, and the dielectric constant is 3.48; a first input/output port of the seven-order band-pass filter is connected with a rear first unit element; the first unit element is connected with a second unit element; the second unit element is connected with a third unit element; the third unit element is connected with a second input/output port of the seven-order band-pass filter; a first short-circuited stub is connected between the first input/output port and the first unit element to form a T-shaped structure; the first short-circuited stub is in ground connection through a first via hole. According to the ultra-wideband filter, the ultra-wideband filter design can be separated from the notched characteristic design; notch resonators can be introduced without changing any structure parameters of the conventional filter, and the performance of the conventional filter is basically prevented from being influenced.