58results about How to "Suppress signal interference" patented technology

An antenna device comprising: a feeding radiation electrode and a non-feeding radiation electrode separately disposed on a surface of a dielectric substrate; a short circuit part of the feeding radiation electrode and a short circuit part of the non-feeding radiation electrode adjacently disposed to each other on one side surface of the dielectric substrate; and an open end of the feeding radiation electrode and an open end of the non-feeding radiation electrode disposed on mutually different surface sides of the dielectric substrate other than the surface on which said short circuit parts are disposed.

A compact surface-mounted antenna having a wide frequency band. In the surface-mounted antenna, a first radiation electrode is formed on the left-half region of the upper surface of a base dielectric substrate. A multi-layer dielectric substrate is laminated on the upper surface of the base dielectric substrate to be bonded and fixed thereto. A second radiation electrode is formed on the right-half region of the upper surface of the multi-layer dielectric substrate. The first and second radiation electrodes are not vertically opposed to each other. Opposing edges of the first and second radiation electrodes are oblique lines. A feeding signal of a signal source is supplied to the first radiation electrode by coupling from a feeding connection electrode, and then, is supplied to the second radiation electrode from the first radiation electrode by another coupling between the first and second radiation electrodes. A direction in which the first radiation electrode excites is set to be substantially perpendicular to a direction in which the second radiation electrode excites.

The invention discloses an optical fiber intelligent monitoring system and a monitoring method based on a phase signal carrier technology. The optical fiber intelligent monitoring system comprises two-core closed-loop inducting optical cables distributed in an inducting area, an optical package, a signal processing unit and a personal computer (PC) host computer. Signals inducted by the two-core closed-loop inducting optical cables are transmitted to the PC host computer sequentially through the optical package and the signal processing unit. The optical package carries out light splitting and modulation to the optical signals, the two-core closed-loop inducting optical cables generate two lines of interference lights to external inductions, and the interference lights are processed through the signal processing unit and sent to the PC host computer, and alerting signals are generated after the signals are analyzed. And therefore the purposes of high sensitivity, large detecting range and short response time are achieved.

The invention discloses a small-size high-isolation double-frequency MIMO antenna for a WLAN (Wireless Local Area Network), and belongs to the technical field of antennas. A first dielectric plate (1) is covered by two metal grounding plates (11), and the two metal grounding plates (11) are arranged vertically and are connected with each other through an inductor (12). Two surfaces of a second dielectric plate (2) and two surfaces of a third dielectric plate (3) are respectively coated with metal layers, wherein one metal layer is a dipole antenna unit which is arranged symmetrically, and the other metal layer is a rectangular metal belt (25). The antenna can completely cover the working frequency bands (2.4-2.485GHz and 5.15-5.85GHz) of the WLAN, is small in size, is high in isolation, and is good in performance of directed radiation. Moreover, the impact on the antenna from a background installation environment is smaller, and the antenna is suitable for roof-absorbing installation.

The invention discloses a radio detector for seismic exploration or vibration test. At least a pair of paired radio detector core bodies with consistent performance are installed in a rigid outer shell (2) made of magnetic materials in the form of head-to-head or bottom-to-bottom, a tail cone (5) or a tail base (12) is rigidly connected with the rigid outer shell (2); when a pair of radio detector cores are formed, two pairs of output signals are linked in parallel or in series reversely to form a pair of output signals as the output signal; when there are more than two pairs of radio detector cores, same-phase output signals of the radio detector cores at one side are linked in series or in parallel to form a pair of output signals; two pairs of output signals at both sides are linked in series or in parallel reversely to form a pair of output signals as the output signal. By using magneto-electrical type radio detector cores with matured technology and low cost, the radio detector basically removes the interference or false frequency of cross vibration on the radio detector; the radio detector is applicable to the analyzing field of the seismic exploration including slot wave exploration and various vibration tests.

The invention discloses a special radiation signal simulation device and an implementation method. The simulation device comprises a restraint condition construction unit, an array weighting coefficient calculating unit, an emission array amplitude control unit, an emission antenna array unit, a battle situation parameter management unit, a radar signal source unit, an up-conversion unit, a receiving array amplitude control unit, a receiving antenna array unit, a down-conversion unit and an intermediate frequency signal processing unit, wherein the restraint condition construction unit, the array weighting coefficient calculating unit, the emission array amplitude control unit and the emission antenna array unit are connected in sequence; the battle situation parameter management unit, the radar signal source unit and the up-conversion unit are connected in sequence; the receiving array amplitude control unit, the receiving antenna array unit, the down-conversion unit and the intermediate frequency signal processing unit are connected in sequence; the array weighting coefficient calculating unit is connected with the receiving array amplitude control unit; the up-conversion unit is connected with the emission antenna array unit; the emission antenna array unit is an emission antenna array consisting of a plurality of emission antenna array elements; the receiving antenna array unit is a receiving antenna array consisting of a plurality of receiving antenna array elements. By adopting the special radiation signal simulation device and the implementation method, nulls can be formed at a plurality of specified angles, a quick calculating process is achieved, and radiation signals with a capability of suppressing echoes in specific directions can be simulated.

Ultra-wideband antenna with dual stopband capability can resolve efficiently problem that ultra-wideband communication system is disturbed by signal of narrowband communication system, one side adhesion of medium substrate is as metal layer of radiation cell and microstrip feeder, the other side adhesion is as metal layer of floor, radiation cell is a semicircle metal slice, microstrip and radiation cell are connected. Floor has symmetrical shape with radiation cell and lies on the back of microstrip feeder. Arc gap is set on radiation cell and U-shaped gap is etched on floor. The present invention can realize dual stopband capability at a certain working range (3.1GHz-10.6GHz) to filter disturb to ultra-wideband system by other latent narrowband system.

The invention discloses a mechanical arm posture robustness control method based on an interference estimator. The mechanical arm robustness control method comprises steps of establishing a mechanical arm dynamic model and performing feedback linearity on the mechanic arm dynamic model to simplify the dynamic model into a disturbed double integration model, setting a double-component posture robustness controller in order to realize mechanical arm posture robustness tracking control, and converting a compensated control signal to a voltage signal to input into an actuator so as to complete posture robustness control of the mechanical arm under a disturbed condition. The double-component posture controller comprises two parts. One part is used for configuring an input of a nominal system in order to guarantee that a closed loop system can track reference signals and the other part is used for configuring an interference estimator for performing real-time estimation on model uncertainty and external disturbance and then performing compensation on a control signal. The mechanical arm robustness control method based on the interference estimator can effectively remove or inhibit uncertainty or an interference signal in a kinematic model in order to realize high accuracy tracking on a mechanical arm posture expectation reference signal, and is strong in interference resistance, clear in controlling parameters, less in calculation and strong in implementation.

The invention provides a side-lobe suppression based beam optimization method for electrical tilt parasitic antennas. The method includes the steps of firstly, establishing an antenna array three-dimensional model according to a designed sign, calculating resonant frequencies of antennas and admittance features of antenna ports, introducing calculation results as known parameters of a side-lobe suppression algorithm into a side-lobe suppression algorithm program, and using an optimized result output after the side-lobe suppression algorithm program converges, as an impedance load value; performing further verification on the obtained load value, putting the optimized load value into ports of parasitic units, and calculating a directional diagram of the antennas. The side-lobe suppression based beam optimization method for the electrical tilt parasitic antennas has the advantages that side-lobe suppression is introduced in the optimization process as a second target function, suppression ratios of the main lobe relative to any side lobes are larger than a certain level, and multipath interference suppression can be improved on the premise of ensuring gain, main lobe formation and few nulls.

A wave-potential detector and a wave-potential radiator are provided that detect and radiate wave-potential signals having longitudinally polarized A vectors, respectively. Wave-potential receivers and transmitters incorporating the wave-potential detector and wave-potential radiator, respectively, are also provided. The wave-potential detector includes a biased plasma device, having at least a portion of its bias current that is parallel to the direction of propagation of a wave-potential signal having a longitudinally polarized A vector. Both omnidirectional and directive wave-potential radiators are provided.

The invention discloses a white light interference measurement device and method based on sample space structure illumination. A micro-display is added to an illumination system, and different space patterns can be projected to the surface of a sample; during measurement, a measurement area of the sample is divided according to an acquired sample image in combination with characteristics of the sample to form different illumination patterns; the illumination patterns are input into the micro-display, and asynchronous spatial illumination and white light interference measurement are carried outon adjacent areas, so as to avoid coherent interference signal interference caused by multiple reflections between adjacent points; and then, the plurality of groups of measured surface height distributions are combined to obtain the height distribution of the whole surface. Interference between adjacent points during white light interference measurement of samples such as a micro-groove array issuppressed by adopting a spatial pattern illumination method, and the samples can be quickly detected in a nondestructive manner.

A wideband interference suppression system comprises at least one signal conditioning device receiving at least one input signal having a signal of interest portion and an interference signal portion, wherein the at least one signal conditioning device is adapted to provide selective, independent, and variable control of one of a phase, a time delay, an amplitude, a radio frequency signal division, and a radio frequency signal summation of the at least one input signal to produce a modified signal. A tunable cross correlator receives a signal representative of the modified signal and is adapted to estimate one of an amplitude, a time delay and a phase delay parameter of the interference signal portion and to generate a control logic signal therefrom, wherein the control logic signal is received by the at least one signal conditioning device for independently and selectively activating and adjusting the various components thereof to suppress the interference signal portion.

Power supplier is in use for restraining signal interference generated in electronic equipment caused by fluctuant earth current. The power supplier includes a transformer, a first side circuit, second side circuit, and grounded conductor. Through cascaded a capacitor and an inductor, the method connects the first side circuit and the second side circuit to grounded conductor. Added capacitor can filter out noise and interference in DC and low frequencies components as well as help to maintain representation of lowered electromagnetic interference. Added inductor is in use for getting rid of noise in high frequency and interference. Most part of noise and interference signal is not possible to pass through conduction route formed. The result of the grounded method is that interfere degree is reduced greatly.

Provided is a wireless battery control system, a method and a battery pack. The system includes a master, and a plurality of slaves sequentially positioned at different distances from the master. The master wirelessly transmit a preparation signal when entering an ID assignment mode. Each slave wirelessly transmits Received Signal Strength Indicator (RSSI) of the preparation signal to the master when wirelessly receiving the preparation signal from the master or other slave during operation in a standby mode. The master wirelessly transmits an ID associated with the operation count to a slave having wirelessly transmitted a maximum RSSI among the RSSIs of the preparation signal, and increases the operation count by 1.

The invention discloses a flexible anti-aging shielding twisted pair cable and a preparation method thereof. The cable is characterized in that four twisted-pair wire cores and a cross-shaped fillingcore material are twisted together to form a cable core, the exterior of the cable core is coated with a fluororesin wrapping tape layer, an aluminum-plastic composite tape wrapping layer, a copper wire shielding winding layer and a silane grafted crosslinked high-density polyethylene insulating layer, the pair-twisted wire core is formed by pair twisting of two insulating wire cores, each insulating wire core comprises an inner conductor and a silane grafted crosslinked low-density polyethylene insulating layer, a nickel copper damage prevention coating and a zinc oxide barrier layer are sequentially sprayed outside the inner conductor and the copper wire shielding winding layer, the cross-shaped filling core material comprises a cross-shaped resin matrix and an aluminum foil layer, an aluminum-plastic composite belt wrapping layer is of an aluminum-plastic composite belt gap wrapping structure, and the aluminum-plastic composite belt comprises an aluminum foil belt outer layer and aPET resin belt inner layer. The cable is advantaged in that the cable effectively suppresses signal interference caused by crosstalk between the pair-twisted wire cores, can effectively suppress a copper damage phenomenon of an insulating layer, and has better mechanical strength, flexibility and electrical characteristics.

The invention discloses a miniaturized broadband five-frequency-band band-pass filter. The filter comprises an upper-layer micro-strip structure, a middle-layer dielectric substrate and a lower-layer grounding metal plate, the upper-layer micro-strip structure is attached to the upper surface of the middle-layer dielectric substrate, and the lower-layer grounding metal plate is attached to the lower surface of the middle-layer dielectric substrate. The upper-layer microstrip structure is a five-frequency-band band-pass filter, the five-frequency-band band-pass filter comprises an input feeder line and an output feeder line which are arranged at the two ends, a square structure is arranged between the input feeder line and the output feeder line, a regular octagonal structure is arranged in the square structure, a+9nd two groups of gradually-changed stepped impedance resonators are symmetrically arranged in the regular octagonal structure by taking the diagonal line of the square structure as the center line. In order to improve the broadband, a pair of open-circuit branches are loaded at each of the eight vertexes of the regular octagonal structure, an open-circuit branch is loaded at the midpoint of each side of the square structure, and the open-circuit branches are connected with the input feeder line and the output feeder line at the two ends respectively, so that the broadband five-frequency band is realized.