1890results about "Electromagentic field characteristics" patented technology

The present invention provides a method and apparatus for detecting magnetic fields in implantable medical devices. The apparatus includes a sensor adapted to provide at least one signal proportional to at least one vector component of a magnetic field. The apparatus further includes a circuit adapted to receive the signal and perform a predetermined action when a predetermined quantity exceeds a predetermined threshold value.

An antenna module and a portable communication terminal equipped with the antenna module are provided. The antenna module has a space-saving design, and also has both a capability for long communication distance for a tag function and a capability for wide communication range for a reader/writer function.

A first antenna coil (11) for communication with a reader/writer and a second antenna coil (12) for communication with an IC tag are disposed on a base substrate (10). The first antenna coil (11) is disposed in an outermost periphery section of the base substrate (10) so that a communication distance is attained. The second antenna coil (12) is disposed within an inner periphery of the first antenna coil (11) so as to achieve overall size reduction of the module.

A method for determining at least one characteristic of an antenna requiring: a) positioning an antenna in a space surrounded by a waveguide; b) feeding an electric excitation signal (u_tx(t)) into a feed connection of the waveguide; c) receiving the electric response signal (u_rx(t)) emitted by the antenna resulting from the excitation signal (u_tx(t)); d) determining at least one characteristic of the antenna from a portion of the response signal (u_rx(t)) and a corresponding portion of the excitation signal (u_tx(t)), where the portion of the response signal (u_rx(t)) is evaluated in the time domain and satisfies the following conditions: (i) only one or more waves of the electromagnetic field caused by the excitation signal (u_tx(t)) and running from the feed connection towards the antenna exist at the location of the antenna; and (ii) the electromagnetic field at the location of the antenna is a TEM field.

A pump for infusing fluid, the pump including a pumping mechanism, a fluid delivery device, a plurality of electric field sensors, and a measurement component. The plurality of electric field sensors is configured to estimate either an electric field that is associated with a patient, or an electric field that is associated with a fluid path of the pump, or both. The measurement component is configured to receive the electric field estimates from each of the electric field sensors and further configured to measure the difference between the electric field estimates.

The invention relates to: A chamber (101, 201, 301, 401) for processing electronic devices (414), the use of such a chamber and a method. The object of the present invention is to provide a flexible system for and method of decreasing the processing time per unit of electronic devices during production and test, thus reducing costs. The problem is solved in that the chamber (101, 201, 301, 401) is adapted for handling several devices (414) simultaneously and said processing comprises a transfer of airborne signals (429, 430, 431). This has the advantage of allowing a simultaneous test under controlled and homogeneous conditions. The invention may be used in the production and test of electronic devices such as mobile communications devices.

A lightning detection system for detecting and locating an initial discharge of an initial leader stroke of a lightning flash. An initial lightning discharge produces a pulse that can be used to accurately detect lightning, and more particularly, the location of the initial lightning discharge. In one embodiment, at least three sensors detect and determine the location of the first pulses from initial lightning discharges using time difference of arrival information of the pulses at each of the three sensors. In another embodiment, a single sensor is used to determine the range of an initial lightning discharge from the amplitude of a corresponding initial detected pulse, and to determine the direction from a crossed loop antenna An alternative embodiment of a single sensor system determines a distance of a lightning event from a peak amplitude value derived from a pulse amplitude distribution. In a further embodiment, a lightning detection system provides enhanced lightning location by incorporating weather data from a weather radar with detected lightning information.

this invention relates to power in direct-current circuits. The invention takes gallium arsenide as foundation (1). On the foundation has power divider, power synthesizer, 90deg phaser, solid beam structure. Power divider and power synthesizer composed by port one (7), port two(8), port three(8), dissymmetry coplane band line(10), nitride tantalum electric resistance. Solid beam structure includes signal input port(16), pier(5), solid beam(13), pedestal structure(6), sensing electrode(4), sensing electrode leader(12), capacitance detecting port(15), air bridge(14). There are nitriding silicon medium layer on the transmission line, pedestal structure and sensing electrode under solid beam, and sensing electrode leader under Air Bridge.

The present invention provides a batch testing system and method that applies a single shielded anechoic chamber to simultaneously test multiple wireless communication devices. The shielded anechoic chamber can avoid external electromagnetic interference, reduce strength of reflected signals significantly and provide stable channel environment, thereby testing signal transceiving of the wireless communication devices more precisely. The present invention also provides a design for the batch container and loading mechanism within the chamber.

The invention discloses an apparatus for detecting the electromagnetic sensitivity of an automobile. For a heavy current injection detection, the invention comprises a power supply, an artificial power supply network, a current injection probe, a current monitor probe, a control unit, an interface card, a signal generator, a power amplifier, a first power unit and other units; for a freefield detection, the invention comprises the power supply, the artificial power supply network, a radio frequency emission antenna, a field intensity probe, the control unit, the interface card, the signal generator, the power amplifier, a field intensity monitor and other units. The invention can be adopted to achieve the heavy current injection automatic detection and the freefield automatic detection for automobile electronic products with high detection efficiency, can effectively reduce the labor intensity of detecting staffs, and reduce the possibility of detection errors.

This invention is characterized to include a discrete analysis frequency width change specifying process for specifying in a particular frequency range a change in the discrete high-speed Fourier transform (FFT) analysis frequency width and a modeling process for allocating different discrete FFT analysis frequency widths to the specified frequency range and to a frequency range other than the specified frequency range and performing modeling. The EMI analysis method of this invention reflects on the gate level power supply current calculation the influence of decoupling by resistance, capacitance and inductance of the power supply and ground, thereby making it possible to evaluate the EMI of LSIs in simulation in a realistic time and to provide efficient EMI countermeasures through supporting the identifying of the EMI causing locations.

An improved mobile telephone (1) is made. It is improved in the sense that it assesses the SAR, namely the power thermally absorbed by a material representing biological tissues placed against the telephone in conditions of use, and it parametrize its operation according to this rate. Thus, a solution is proposed guaranteeing the user a use of the telephone that is without risk for his health.

A method and apparatus for calculating the radiated sensitivity of a mobile terminal positioned in multiple test orientations for multiple combinations of frequency channel and mobile terminal configuration is described herein. Test equipment measures a reference sensitivity of the mobile terminal when the mobile terminal is positioned in a reference orientation. Further, the test equipment estimates an antenna gain associated with a mobile terminal antenna when the mobile terminal is positioned in a test orientation. The test equipment then adjusts the reference sensitivity, based on the estimated antenna gain, to calculate the sensitivity of the mobile terminal positioned in the test orientation.

The invention relates to a method for predicting electromagnetic wave propagation based on a ray tracking method, which comprises the steps of ray path searching, reflected and diffracted ray calculation, field intensity receiving, and path loss calculation. The conception of the method comprises the following steps: firstly, determining the position of an emission source, and finding out all propagation paths from the emission source to the ray of each test point according to building characteristics and distribution on a 3D map; secondly, determining reflection and diffraction losses and the like according to a Fresnel equation, a geometrical diffraction theory/uniform diffraction theory and the like so as to correspondingly obtain the field intensity from each path to each test point; and finally, performing coherence stack on the field intensities of all the arrived paths at the same test point to obtain the total received field intensity at each test point. The method has the advantage of better adaptability compared with the conventional statistical model. The method can be applied to predicting the electric wave propagation in a wireless communication system and adapts to the requirements on wireless network programming and designing.

Systems, methods, and apparatus for detecting UAVs in an RF environment are disclosed. An apparatus is constructed and configured for network communication with at least one camera. The at least one camera captures images of the RF environment and transmits video data to the apparatus. The apparatus receives RF data and generates FFT data based on the RF data, identifies at least one signal based on a first derivative and a second derivative of the FFT data, measures a direction from which the at least one signal is transmitted, analyzes the video data. The apparatus then identifies at least one UAV to which the at least one signal is related based on the analyzed video data, the RF data, and the direction from which the at least one signal is transmitted, and controls the at least one camera based on the analyzed video data.

A quadrifilar antenna having helical windings is fed by a phase shift feed network, each winding having an open circuit termination element, the phase shift feeding network having forward directional phase shift paths from a feed input to phase shift feed output ports, and having a first reverse directional transmission path from one or more of the phase shift feed output ports back to a first isolation port, and a second reverse directional transmission path from another one or more of the phase shift feed output ports back to a second isolation port, the first and second isolation ports isolated from the forward directional phase shift paths, and a differential termination impedance, floating from ground, connected the first and second isolation ports. Optionally, the differential termination impedance is frequency selective.

A power distribution monitoring system is provided that can include a number of features. The system can include a plurality of monitoring devices configured to attach to individual conductors on a power grid distribution network. In some embodiments, a monitoring device is disposed on each conductor of a three-phase network. The monitoring devices can be configured to measure and monitor, among other things, current and electric-field on the conductors. Methods of calibrating the monitoring devices to accurately measure electric-field are also provided. In one embodiment, a first monitoring device on a first conductor can transmit a calibration pulse to a second monitoring device on a second conductor. The second monitoring device can determine a degradation of the calibration pulse, and use that degradation to calibrate electric-field measurements around the conductor.

A radiation detector is disclosed. The radiation detector is disposed on a microwave antenna assembly. The radiation detector includes a receiving antenna adapted to receive microwave energy. The receiving antenna includes a first tubular antenna member and a second tubular antenna member disposed concentrically about a longitudinal axis defined by the microwave antenna assembly. The detector also includes at least one rectifier coupled to the receiving antenna adapted to rectify at least a portion of the microwave energy and a filter coupled to the at least one rectifier and adapted to convert the rectified microwave energy into a detection signal.

A technique for effectively attenuating EMI noise, which is generated from the electric power system of semiconductor devices, is described. In accordance with the technique, a power supply netlist with an additional electric current source(s) is generated by adding block power supply current waveform data, as extracted from test vector data and a block netlist, to the power supply netlist as extracted from the layout data of the circuit under analysis. A circuit simulation of the power supply netlist with an additional electric current source(s) is then performed in order to calculate power supply current/voltage waveform data. Furthermore, current/voltage spectral data is calculated by the Fourier transformation of the power supply current/voltage waveform data followed by displaying the current/voltage spectral data as the result of the Fourier transformation.

The invention relates to a mobile radio-frequency enabled device. In order to enable a lightning detection by means of such a device, it comprises an electromagnetic interferences detection component detecting electromagnetic interferences in at least one radio-frequency channel, which at least one radio-frequency channel is usable by the mobile radio-frequency enabled device for a communication link. The device further comprises a processing component adapted to determine whether a lightning stroke can be assumed to have occurred in the vicinity of the mobile radio-frequency enabled device due to an electromagnetic interference detected by said electromagnetic interferences detection component. The invention relates equally to a corresponding system, to a corresponding method and to a corresponding software program product.

A radiation detector disposed on a microwave antenna assembly is disclosed. The radiation detector includes a receiving antenna adapted to receive errant microwave energy and a rectifier coupled to the receiving antenna that is adapted to rectify at least a portion of the errant microwave energy. A filter is coupled to the rectifier and is adapted to convert the rectified microwave energy into a detection signal.

The invention relates to a digital lightning detection method and a device thereof. The method comprises the following steps: receiving an electromagnetic signal generated when cloud-to-ground flash lightning discharging to generate an electric detection signal; digitalizing the conditioned electric detection signal; filtering the digital signal; establishing a uniform time scale; establishing a lightning signal identification criterion and a digitized cloud-to-ground flash lightning signal identification model by a time determination method, a bipolar test method and a homopolar test method by considering transmission features of a lightning electromagnetic radiation waveform; establishing a time window preprocessing area, and acquiring a development trend of the input digital signal and the corresponding typical parameters; and computing and determining the parameters of the input digital signal in combination with data in the time window by the digitized cloud-to-ground flash lightning signal identification model . The device consists of an antenna, a signal conditioner, an analog to digital converter, a module of cloud-to-ground flash lightning signal identification model, a system control manager, an assistant control manager, a communication interface, an external memory and a clock.

The invention relates to the technical field of electromagnetic environment prediction, and discloses an aircraft external radio frequency electromagnetic environment prediction method and a prediction system. The system comprises an electromagnetic environmental parameter acquisition device, a data center, a simulating calculation center and a visual output terminal device. The method is that collected electromagnetic environmental parameter information of radiation sources, atmospheric environment, ground environment and sea environment is transmitted to the data center which is connected through networks by means of the electromagnetic environmental parameter acquisition device, and is stored in a data base which corresponds to the data center. The data center is connected with the simulating calculation center through a data line, and the simulating calculation center enables comprehensively predicted data model information of aircraft external radio frequency electromagnetic environment to be transmitted to the visual output terminal device which is connected through a video bus, so that the electromagnetic environment can be displayed comprehensively. According to the aircraft external radio frequency electromagnetic environment prediction method and the prediction system, an improved signal description word method is adopted to conduct modeling of aircraft external electromagnetic signal environment, and therefore the signal processing operational amount is reduced and the prediction efficiency is enhanced.

The invention discloses a VHF (very high frequency) frequency-range intracloud lightning detecting and positioning system, which comprises a central treatment station and a plurality of detection and treatment sub-stations arranged in different positions, wherein the detection and treatment sub-stations and the central treatment station are accessed into a public wide area network in a wired or wireless mode; and through the wide area network, on one hand, obtained intracloud lightning detection data is uploaded to the central treatment station by the detection and treatment sub-stations, andon the other hand, the working state of each detection and treatment sub-station is remotely monitored by the central treatment station. The system can be used for precisely estimating the incidence directions of lightning radiation signals of a plurality of simultaneously occurring lightning radiation sources or the same lightning radiation source arriving at the detection sub-stations through different propagation paths, the arriving time difference of the lightning signals between any two detection and treatment sub-stations is calculated at the central treatment station (TDOA estimation),and the spatial position of an intracloud lightning radiation source is determined by DOA and TDOA information.

The invention provides a method and a device for estimating environmental electromagnetic radiation of a base station. The method for estimating environmental electromagnetic radiation of the base station comprises the steps: acquiring a first radiation quantity estimated value of a broadcast wave beam of the base station at a predicted point and a second radiation quantity estimated value of a business wave beam of the base station at the predicted point; and generating the environmental electromagnetic radiation of the base station according to the first radiation quantity estimated value and the second radiation quantity estimated value. On the premise of satisfying the precision of application requirement, the method and the device have the features of being simple and easy in use and convenient in promotion.

In an apparatus for measuring a specific absorption rate (SAR) for use in a radio apparatus, a first near magnetic field of a radio wave radiated from a reference radio apparatus is measured in free space, and an SAR of the radio wave radiated from the reference radio apparatus by using a predetermined phantom according to a predetermined measurement method. A transformation factor α is calculated by dividing the measured SAR by a square value of the measured first near magnetic field, and a second near magnetic field of a radio wave radiated from a radio apparatus to be measured is measured in free space. Then an SAR of the radio wave radiated from the radio apparatus to be measured is estimated and calculated by multiplying a square value of the measured second near magnetic field by the calculated transformation factor α.

The invention discloses a system for pre-testing and diagnosing the electro magnetic interference of electronic equipment, which is characterized by comprising a data collecting module, an interference source diagnosing and locating module, an environmental noise eliminating module and a visual time-frequency analyzer, wherein the data collecting module, the interference source diagnosing and locating module and the environmental noise eliminating module are respectively connected with the visual time-frequency analyzer, and the visual time-frequency analyzer achieves the drive of the data collecting module, the call of the interference source diagnosing and locating module and the environmental noise eliminating module and the monitoring and displaying of time-domain waveforms and frequency spectrums. The invention also discloses a method for pre-testing and diagnosing the electro magnetic interference of electronic equipment, which utilizes a LabView visual instrument platform and Matlab programming environmental developing software to pre-test and diagnose signals. The invention can pre-test and diagnose the electro magnetic interference of electronic equipment at common test fields, and has high automation and carrying degree and simple usage and reduces cost.

The invention discloses a lightning detection and positioning system and method, which relate to the technical field of meteorological detection. The system comprises an antenna unit, a receiver unit, a waveform characteristic extracting and processing unit and a monitoring and controlling unit, wherein the antenna unit is used for detecting an electromagnetic field variation signal while lightning happens, detecting a GPS satellite signal and transmitting the electromagnetic field variation signal and the GPS satellite signal to the receiver unit; the receiver unit is used for receiving the electromagnetic field variation signal and the GPS satellite signal; the waveform characteristic extracting and processing unit is used for extracting electromagnetic field variation signal waveform characteristic parameters in real time and analyzing the parameters to obtain a cloud ground flash identification result and a ground flash positioning result; and the monitoring and controlling unit is used for collecting and storing the waveform of the electromagnetic field variation signal in real time, marking the time of collecting the lightning waveform and displaying the position of the ground flash in a geographical information system in real time. The system and method disclosed by the invention, multifunctional single-station lightning detection and positioning of the lightning waveform collection and lightning strike-back positioning can be carried out.

The invention relates to a method for calibrating a high-frequency electric field probe, which comprises an anechoic chamber, an electromagnetic interference (EMI) filter, a radiofrequency signal generator, a power amplifier, a transmitting antenna, a vertical and horizontal polarization or isotropic field intensity monitoring antenna, and auxiliary equipment used for recording power level. The method comprises the following steps of: sending an electromagnetic field with specific amplitude and specific frequency through the radiofrequency signal generator in the anechoic chamber used for shielding an electromagnetic field, arranging a probe to be calibrated and the auxiliary equipment according to a certain mode, and realizing the calibration for the high-frequency electric field probe by comparing a produced field value and the reading of the electric field probe to be calibrated.

The measuring system includes a receiver including at least one fixed receiving antenna for picking up electromagnetic fields generated by a transmitting antenna belonging to an electronic device, and a positioning device on which a support element is placed. The positioning device includes mechanisms for driving the support element in rotation. The measuring system further includes a detection device for detecting position/orientation of the transmitting antenna, and a data processing station. A hollow spherical element houses the electronic device and is held on the positioning device by gravity on three points, one of which is formed by a drive member, and the two other points are formed using ball and socket joints. Several circular barcodes arranged on the external surface of the spherical element enable the system to determine the position/orientation of the spherical element using the digital camera.

The invention provides a system of monitoring electromagnetic radiation. The system of monitoring the electromagnetic radiation comprises monitoring nodes, regional nodes and a control center. A monitored object is provided a plurality of monitoring nodes, the plurality of monitoring nodes are stereoscopically arranged surrounding the monitored object, one regional node is in wireless connection with the plurality of monitoring nodes, and the regional nodes are used for uploading multiple environmental index parameters collected by the monitoring nodes to the control center. A plurality of regional nodes are electrically connected with the control center. The invention further provides a method of monitoring the electromagnetic radiation. The method of monitoring the electromagnetic radiation comprises the following steps: correspondingly setting the plurality of vertically distributed monitoring nodes around the monitored object according to the radiation distribution feature of the electromagnetic radiation stereoscopic space range of the monitored object, collecting multiple environmental index parameters at least including electromagnetic radiation signals of the monitored object, and carrying out data analysis and processing to the collected multiple environmental index parameters. The system and the method of monitoring the electromagnetic radiation improve the accuracy and the automation degree of monitoring the electromagnetic radiation.