117 results about "Uhf antennas" patented technology

The simulating experiment equipment for local discharge in gas insulated combined electric appliance consists of inducing pressure regulator, no-corona experiment transformer, no-local discharge protecting resistor, standard capacity voltage divider, GIS simulating experimental device, internal UHF antenna sensor and external UHF antenna sensor, microstrip line filtering amplifier, intelligent UHF multiplexer, wide band high speed ultrahigh capacirty digital storage oscilloscope and microcomputer. The simulating experiment equipment and method for local discharge in gas insulated combined electric appliance may be used for simulating various defaults inside GIS to obtain PD experiment data reflecting various kinds of insulation defaults and distinguish the PD modes of the insulation defaults in GIS, so that the present invention may be used widely in relevant theoretical analysis and application research.

The invention discloses a partial discharge simulation experiment device of suspended metal particles in oil of a transformer, which belongs to the technical field of partial discharge online monitoring of oil immersed transformers. The partial discharge simulation experiment device mainly comprises an induction regulator, a non-corona test transformer, a non-partial discharge protective resistor, a standard capacity voltage divider, a partial discharge generation device, a noninductive detection resistor, an ultrahigh frequency antenna, a coaxial cable, a broadband high-speed large-capacity digital storage oscillometer and the like. The partial discharge simulation experiment device can simulate stable partial discharge signals generated by the suspended metal particles in flowing oil with different oil flowing speeds at different temperatures when the oil immersed transformer is in a working stage. Therefore, the partial discharge simulation experiment device can be widely applied to the simulation of partial discharge generated by the defect of the suspended metal particles in the oil immersed transformer in a laboratory and can provide reliable experimental data for teaching, scientific research institutions and schools and transformer manufacturers to monitor oil immersed transformers on line and analyze and apply partial discharge signals.

The invention relates to an ultra-high frequency positioning and detection device of local discharge of electrical equipment and a method thereof, belonging to the technical field of experiments of local discharge of the electrical equipment. The device comprises a steep-sided pulse generator, an ultra-high frequency antenna, a high frequency coaxial cable and a high sampling rate oscilloscope. The device is characterized in that the steep-sided pulse generator is a nanosecond pulse generator. The method performs the positioning computation by using the device and a computer through a program and a positioning principle based on the time difference method. The device has simple connection; nanosecond pulse signals generated by the steep-sided pulse generator can really simulate ultra-high frequency signals of the local discharge of the electrical equipment and have strong interference resistance and high accuracy of read time different signals, thereby improving the positioning accuracy. The invention can be widely applied to the experiment of the ultra-high frequency positioning detection of the local discharge of the electrical equipment.

An ultra high frequency antenna includes a first plane, a second plane opposite to the first plane by a distance, a driven dipole, at least a parasitic element having an indentation, and a balun. The balun includes a coplanar strip line and a microstrip line which has a first strip, a second strip area parallel to the first strip, and a third strip perpendicular to the first and second strips. The coplanar strip line coupled to a truncated ground plane with two narrow slots. The present planer antenna features a compact size, wide impedance bandwidth, moderate gain, and excellent front-to-back ratio. This antenna is well suitable for the applications in RFID handheld readers.

The invention discloses a GIS fault diagnosis system and a method thereof. The system comprise a vibration signal acquisition module, a UHF signal acquisition module, an ultrasonic signal acquisition module and a personal computer. The vibration signal acquisition module comprises a vibration signal processing module, a vibration signal acquisition device and multiple vibration sensors; the vibration sensors acquire vibration signals and transmit to the vibration signal acquisition device after processing through the vibration signal processing module; the UHF signal acquisition module comprises a UHF signal processing module, a UHF signal acquisition device and multiple UHF antennas; the UHF antennas acquire UHF signals and transmit to the UHF signal acquisition device after processing through the UHF signal processing module; the ultrasonic signal acquisition module comprises an ultrasonic signal processing module, an ultrasonic signal acquisition device and multiple ultrasonic signal sensors; the ultrasonic signal sensors acquire ultrasonic signals and transmit to the ultrasonic signal acquisition device after the processing through the ultrasonic signal processing module. By the aid of the system, the problem that the GIS operation state cannot be estimated completely through one single diagnostic method is solved.

The invention relates to the technical field of switch cabinets and provides a switch cabinet operation monitoring and evaluating system, which comprises an online monitoring module, an operation state evaluating module and a service life predicting module, wherein the online monitoring module is used for online monitoring partial discharge of the switch cabinet and carrying out current and historical query; the operation state evaluating module is used for evaluating the operation state according to the total historical discharge amount of the switch cabinet; the service life predicting module is used for evaluating the service life of the switch cabinet; and the online monitoring module, the operation state evaluating module and the service life predicting module are all connected with a main server. The switch cabinet operation monitoring and evaluating system has the beneficial effects that an ultrahigh frequency antenna is used for acquiring partial discharge signals of the switch cabinet, through filter amplification, recognition conversion and storage, problems of discharge signal attenuation and interference are solved, and accurate online monitoring on the partial discharge of the switch cabinet can be realized; according to the discharge data and the operation state data of the switch cabinet, the switch cabinet evaluation service life under a Weibull distribution model under a statistical characteristics-based fault tree can be obtained; and the system has a reasonable structure, the efficiency is high, and the application prospect is wide.

The invention discloses a no-blind zone precise locating system and locating method for radio frequency identification. A low-frequency excitation module of a laser comprises at least two excitation circuits with staggered operation time sequences and different numbers, and the different excitation circuits form a low-frequency excitation signal intersection zone; a low-frequency receiving module gathers low-frequency excitation signals and sends mark information to a reader-writer through an ultrahigh frequency wireless sending module; an ultrahigh frequency wireless label signal receiving module receives label signals through an ultrahigh frequency antenna and transmits the label information and low-frequency excitation mark information to an upper computer; an ultrahigh frequency wireless synchronization signal sending module transmits synchronization signals to a first MCU in a wireless mode to control the synchronization state of the operation time sequences of the low-frequency excitation circuits. The no-blind zone precise locating system and locating method for the radio frequency identification realize the no-blind zone precise locating for management targets through using ultrahigh frequency wireless signals to synchronize low-frequency trigger signal time sequences.

The invention relates to a ultrahigh frequency antenna array partial discharge detection system comprising a partial discharging source and partial discharging sensors. The partial discharging source sends ultrahigh frequency signals and is arranged in a substation; the partial discharging sensors are arranged at the periphery of the partial discharging source, and the distances between each partial discharging sensor and the partial discharging source are different. Compared with the prior art, a principle of minimum optical path differences is utilized, transmit features of ultrahigh frequency electromagnetic signals produced by partial discharging source in the air are studied, influences on signal transmitting by positions of substation equipment are considered, and partial discharging positioning can be realized according to delay of signals reaching different detecting points; determination of the time of the first wave of the signals, method for acquiring the signal delay and realization of accurate positioning of discharging signals based on discharging signal delay sequence analysis and spatial analysis, by the methods of signal first wave value, power accumulation, time and space calculation and minimum power value, are studied.

The invention discloses an anisotropic Z-type hexagonal ferrite which is suitable for high and ultrahigh frequency band antennas and has the components: Ba3Me2Fe24O41, wherein Me is one of Co, Zn, Ni, Mg and Cu. The sintering temperature of the anisotropic Z-type hexagonal ferrite is controlled to be from 1150 DEG C to 1300 DEG C; trace oxides are added for regulating a dielectric constant, permeability and the sintering temperature; therefore, a real part epsilon' of the dielectric constant is from 1 to 20; a real part mu' of complex permeability is from 1 to 10; and the dielectric constant or the permeability is basically unchanged as certain values within a certain frequency band of 100 MHz to 3 GHz. The hexagonal ferrite has high cut-off frequency, high dielectric constant and high permeability due to higher magnetic anisotropy field, and can be applied to miniaturization of the sizes of the high and ultrahigh frequency band antennas.

The invention discloses an ultrahigh frequency tag reading device having an image recognition function. The ultrahigh frequency tag reading device comprises an industrial control computer, an embeddedGPU, an embedded CPU, an ultrahigh frequency driving module, ultrahigh frequency antennae, a communication module and an image acquisition module. The industrial control computer is connected with the communication module, the communication module is connected with the embedded GPU and the embedded CPU, the image acquisition module is connected with the embedded GPU, the ultrahigh frequency driving module is connected with the embedded CPU, the ultrahigh frequency driving module is connected with the ultrahigh frequency antennae, and a plurality of ultrahigh frequency antennae are arranged. By employing the image recognition mode, the problem that when a bar code is stained or sheltered and an ultrahigh frequency RFID tag is damaged, the luggage cannot be recognized is solved. By employing the image recognition technology, the luggage contour in the image can be recognized quickly, feature points are extracted and compared with a luggage image library stored in the system in real time, and the aim of luggage recognition is achieved.

The invention discloses a method for designing a Hilbert fractal ultrahigh frequency antenna. The method includes the steps of arranging a grounding board and a Hilbert fractal wire layer on the two sides of a dielectric substrate respectively, enabling the lengths of parallel dual wires, short circuit terminals and additional wire sections to serve as parameters when the sizes of all parts of wire sections inside the wire layer are determined, meanwhile, considering the wire width, the dielectric thickness and the dielectric constant to build calculation equations of the resonance frequency and the standing-wave ratio of the antenna, carrying out simulating optimization on the parameters within the available ranges of the resonance frequency and the standing-wave ratio to obtain optimal values of the lengths of the three kinds of wire sections and the widths of the wire sections, and finally manufacturing the Hilbert fractal ultrahigh frequency antenna according to the simulation results. According to the method, the Hilbert fractal ultrahigh frequency antenna is optimized by changing the lengths of the parallel dual wires, the short circuit terminals and the additional wire sections, and the collecting effect of the antenna on partial discharge ultrahigh frequency signals of electrical equipment is greatly improved.

The invention discloses a transformer partial discharge ultrahigh frequency detection Hilbert fractal antenna optimization method. The method includes the following steps: S1, determining a fitness function of a genetic algorithm according to a design object of an ultrahigh frequency antenna, and controlling the search direction of the algorithm; S2, determining structural parameters a, b, and c, of the antenna and an encoding and decoding scheme of (x, y); S3, using each group of structural parameters of the ultrahigh frequency antenna as an individual, and determining a certain number of individuals as an initial population of the genetic algorithm; S4, decoding a binary code of each individual into a structural parameter of the ultrahigh frequency antenna, invoking Ansoft Designer software to perform simulation so as to acquire an electrical characteristic parameter of the antenna, and substituting the calculated standing-wave ratio into the fitness function to calculate the fitness value of the individual; and S5, determining if a design demand of the antenna is met or not according to the returned fitness value of the individual. The invention provides an analysis antenna automatic optimization algorithm which can improve the design ability and efficiency of the antenna, and can acquire a partial discharge ultrahigh frequency detection Hilbert fractal antenna having excellent performance.

The invention discloses a system and a method for identifying multiple RFID tags in a sealed metal environment. The system comprises a control module and an RFID reader-writer, wherein the control module is connected with the RFID reader-writer, a locking apparatus of a sealed metal device and a remote server, and is used for user identity recognition and authentication, RFID tag registration and management, and remote server information transmission and reception; the RFID reader-writer is connected with the control module and an UHF antenna group, and is used for blind area monitoring, UHF antenna time division switching, RFID tag collision detection and RFID tag identification; the UHF antenna group comprises two or more UHF antennas; each UHF antenna is connected with the RFID reader-writer; and the RFID tags are attached to to-be-managed articles. According to the system and the method, the design of the antennas reliably working in the sealed metal environment is realized, the sensitivity of the RFID tags to the environment and the mutual interference of short-distance adjacent tags are overcome, the difficult problem in static and effective identification of densely stacked articles in a sealed metal space is solved, and the misreading rate and the missing reading rate of the RFID tags are reduced as far as possible.

The invention provides a multi-hypothesis UKF target tracking method for UHF-RFID system. The method comprises the following steps: step 1) using the VIRE method to estimate the initial position of a mobile robot; determining the label area where the initial position of the robot is located; arranged particles in the area in a uniform manner, and through these particles, describing the initial state of the mobile robot; step 2) collecting the measurement information of each ultra high frequency antenna, generating the position estimation of the mobile robot as the observation input, then using the unscented Kalman filter method to forecast and update the states of the particles respectively, and calculating the weight of each particle; step 3) according to the weights of the particles, screening particles, and then re-sampling them; and step 5) integrating the screened particles to obtain the current state estimation of the mobile robot; and repeating to execute the step 1 to step 4 so as to realize the mobile robot tracking under the UHF-RFID environment. The method can achieve better positioning accuracy and converging speed.

A UHF RFID antenna is integrated into the disposable metal cover of foam, plastic, metal or cardboard containers.

The invention relates to a warehouse safety monitoring and checking method and system based on a robot, and the invention comprises a warehouse fire fighting access blocking early warning method, a warehouse checking method, a warehouse temperature and humidity early warning and fire early warning method, a warehouse fire extinguisher loss early warning method, a warehouse illegal person alarm method and a warehouse inspection system, and includes a tracking trolley and a track, wherein the tracking trolley moves along the track; the robot further comprises a visible light camera which obtains image information in the warehouse; an ultrahigh frequency RFID reader-writer and four-side ultrahigh frequency RFID antennas; an infrared thermal imager module; a temperature and humidity sensor; a 5G communication module; and a face recognition camera and a GPU processor. Warehouse inspection, fire prevention, theft prevention, material blockage and automatic temperature and humidity detection and early warning are achieved, manpower resources are saved to a great extent, meanwhile, goods checking is convenient and fast, and the checking efficiency is greatly improved.

The invention discloses a high-frequency and ultrahigh-frequency double-interface SIM (subscriber identity module) card and a radio-frequency identification system for mobile payment. The SIM card comprises an SIM card chip, an ultrahigh-frequency antenna, an ultrahigh-frequency read/write chip, a high-frequency antenna and an high-frequency read/write chip, wherein the SIM card chip is connected with the high-frequency read/write chip; the high-frequency read/write chip receives a high-frequency signal sent by a reader through the high-frequency antenna, demodulates the signal and sends the demodulated signal to the SIM card chip. The radio-frequency identification system disclosed by the invention realizes non-contact short-distance radio-frequency identification of the mobile phone by use of the high-frequency and ultrahigh-frequency double-interface SIM card and without replacing a new mobile phone, and avoids misoperation on the other high-frequency and ultrahigh-frequency double-interface SIM cards around.

The invention discloses a thin-antenna separated ultra-high-frequency intelligent tag which comprises a miniature ultra-high-frequency intelligent tag module, a coupled amplification antenna and a two-layer composite film, wherein the ultra-high-frequency intelligent tag module is arranged on one surface of an ultra-high-frequency antenna. The ultra-high-frequency intelligent tag module and the coupled amplification antenna are clamped in the middle so that the thin-antenna separated ultra-high-frequency intelligent tag has a waterproof function. Meanwhile, the tag bending requirements are satisfied. The thin-antenna separated ultra-high-frequency intelligent tag of the invention is especially applicable to the field of intelligent tags for clothing trademarks and labels.