165 results about "Radiated emission" patented technology

A method of using a directional sensor for the purposes of detecting the presence of a vehicle or an object within a zone of interest on a roadway or in a parking space. The method comprises the following steps: transmitting a microwave transmit pulse of less than 5 feet; radiating the transmitted pulse by a directional antenna system; receiving received pulses by an adjustable receive window; integrating or combining signals from multiple received pulses; amplifying and filtering the integrated receive signal; digitizing the combined signal; comparing the digitized signal to at least one preset or dynamically computed threshold values to determine the presence or absence of an object in the field of view of the sensor; and providing at least one pulse generator with rise and fall times of less than 3 ns each and capable of generating pulses less than 10 ns in duration.

A composite cover for dust, dirt and incidental moisture protection over an extended temperature range, EMI shielding to prevent radiation of internal circuit energy and preventing the entrance of external EMI. Also the cover provides mechanical strength and protection of circuitry and radiates heat created by internal circuitry. The cover provides lower levels of radiated emissions and improved resistance to incident external radiation. Electric and magnetic shielding is also provided.

An interconnect system between an integrated circuit device and a printed circuit board may include a filter between the integrated circuit device and the power subsystem of the printed circuit board. The filter may be a low-pass filter that reduces current in a higher frequency range without negatively modifying current in a lower frequency range and may reduce radiated emissions produced during operation of the integrated circuit. The filter may be implemented by arranging core-power voltage conductors and ground conductors at a first or second level interconnect into one or more voltage groupings and one or more adjacent ground groupings such that series inductance is increased. In some embodiments, the first level interconnect may include conductive bumps or pads between an integrated circuit and a substrate. In some embodiments, the second level interconnect may include solder balls, pins, pads, or other conductors of a package, socket, or interposer.

Power consumption management for a radio frequency identification (RFID) reader for a radio frequency (RF) transponder system. The RF system includes an RFID device and a host. The RFID reader includes an RFID controller, an excitation signal transmitter, a response signal receiver, an optional RFID device detector, a host interface input/output, and a user interface. The method includes establishing a first power consumption level for the RFID reader, establishing a second power consumption level that is different from the first, and changing between the first level and the second level. The difference between the first level and the second level is derived from at least one technique for power consumption management. A plurality of techniques are presented. Among the potential benefits to reduced power consumption are increased energy efficiency and reduced radiated emissions. The option of choosing between power consumption levels presents unique opportunities in system design, implementation, and operation.

An isolation apparatus for reducing radiated emissions of a microwave energy delivery system including an isolation circuit board and a shield coupling, the isolation circuit board and shield coupling configured to capacitively couple a microwave generator and a coaxial transmission cable and the isolation circuit board further configured to pass energy at a fundamental frequency between the microwave generator and the coaxial transmission cable.

A transmission system comprises a plurality of antenna elements; a plurality of power amplifiers, each of power amplifiers being connected to one of the antenna elements; a plurality of waveform/beam synthesizer assemblies, each of the waveform/beam synthesizer assemblies being connected to one of the power amplifiers; a processor for controlling modulation and beam forming/steering functions of the waveform/beam synthesizer assemblies; and a master clock for synchronizing operation of the processor and waveform/beam synthesizer assemblies, wherein each of the waveform/beam synthesizer assemblies generates a transmit element signal with embedded phase offset and amplitude adjustments in response to control signals from the processor, and each of the plurality of antenna elements radiates one of the transmit element signals. A method of producing one or more beams using an array of antenna elements is also provided.

A spread spectrum clock generator (SSCG) control and inspection circuit provides a system and method for inspecting and controlling an external SSCG, and for verifying the modulation profile waveform of an external SSCG. An electronic circuit is included that can check for the presence of an optimal SSCG modulation profile in product subsystems, and in attached modular systems, including electronic plug-in features such as internal network adapters and cartridges. In one mode of the invention, an electronic circuit ensures continued radiated emissions compliance for field replaceable units or consumable parts within a product, such as a printer, a scanner, or a combination (or all-in-one) printer/scanner. In another mode of the invention, an electronic circuit may also act as a secondary security device for consumable products, such as toner cartridges or ink jet cartridges. In yet another mode of the invention, an electronic circuit may also adjust the attached SSCG clock.

The invention discloses a ground test method for full-aircraft electromagnetic compatibility of a commercial aircraft. The ground test method comprises the following steps: 1, determining the ground test content of the full-aircraft electromagnetic compatibility of the commercial aircraft; 2, specifying reference paper of the ground test basis of the full-aircraft electromagnetic compatibility of the commercial aircraft; 3, classifying regional electromagnetic environments installed in onboard electronic and electrical equipment; 4, determining a limiting value of electromagnetic compatibility test data, the conducted emission acceptability limit of a cable and the radiated emission electric field intensity acceptability limit of each space; 5, determining and researching an electromagnetic compatibility test system; 6, acquiring a curve that the electric field intensities of electromagnetic environments of a test field are changed along with frequencies; 7, performing conducted emission measurement; 8, performing radiated emission measurement; and 9, performing front door coupling interference measurement. According to the ground test method for the full-aircraft electromagnetic compatibility of the commercial aircraft disclosed by the invention, the problems of aircraft electromagnetic environment classification and test part selection, full-aircraft electromagnetic interference test data criterion setting and quantitative test can be solved. The ground test method for the full-aircraft electromagnetic compatibility of the commercial aircraft is applied to analyze and determine whether a commercial aircraft developed machine meets the electromagnetic compatibility requirement and the airworthiness conformity requirement.

An avionics chassis for protecting against damage, dust, dirt and incidental moisture over an extended temperature range, EMI shielding to prevent radiation of internal circuit energy and preventing the entrance of external EMI. The chassis provides lower weight, lower levels of radiated emissions and improved resistance to incident external radiation. Electric and magnetic shielding is also provided.

An adaptive radiated emission control includes measurement of the transmit power spectrum and feedback to a variable power modulator. The variable power modulator creates an adjusted output spectrum that limits radiated emissions. Alternatively, the variable power modulator may also be an equalizer to adjust the output spectrum.

A sterilization device comprising an ultraviolet (UV) electromagnetic radiation (EMR) emitting device, a detector configured to detect occupancy of a room associated with the sterilization device, and a controller operably connected to each of the UV EMR emitting device and the detector. The detector is configured to send a signal indicating occupancy to the controller upon a detection of occupancy. The controller is configured to operate the UV EMR emitting device to emit UV EMR only upon receiving a signal indicating no occupancy.

An automatic test system for high-altitude electric field radiation sensitiveness is disclosed and relates to the technical field of electromagnetic compatibility testing. The system comprises a large-sized detected member, an emission antenna system, a large power signal simulation system, a high-altitude upgrading platform, a field intensity monitor, an electric field probe and a control computer, wherein the control computer is used for sending control instructions to the large power signal simulation system via a signal interface board, the large power signal simulation system is used for generating small power microwave signals and amplifying the same, large power microwave signals are generated and transmitted to the emission antenna system, the emission antenna system is used for subjecting the coupled large power microwave signals to radiated emission into space, high field intensity electromagnetic wave signals are generated in space, the electric field probe is used for monitoring the high field intensity electromagnetic wave signals generated by the emission antenna system in space in real time, and monitoring results are sent to the control computer via the field intensity detector. The system disclosed in the invention can satisfy electric field sensitivity testing requirements for the large-sized measured member which is less than 18 m in height such as a carrier rocket and the like.

In a multicarrier communication using a balanced transmission line such as a power line, a multicarrier communication method operable to select carriers on the basis of an SN-ratio and balancing of the transmission line is provided. Available carriers are selected in accordance with the balancing of the balanced transmission line, in which the balancing is measured at either a sending terminal or a receiving terminal or alternatively at both of them, and the SN-ratio measured between the sending terminal and the receiving terminal. More specifically, any frequency domain having poor balancing and a poor SN-ratio is treated as a non-carrier-employing domain, and consequently the available carriers are selected at other frequency domains. In addition, a modulation method having the greatest permissible multivalue is selected for each of the carriers. The carriers are selected in light of the SN-ratio and balancing, or alternatively in highest-to-lowest order of frequency. Transmission power is controlled for each of the carriers to suppress radiated emission. The SN-ratio and balancing are measured at predetermined time intervals to renew the selection of the carriers and the selection of the modulation methods.

An interconnect system between an integrated circuit device and a printed circuit board may include a filter portion coupled to conductors on a power distribution bus. The filter portion may reduce radiated emissions produced during operation of the integrated circuit. The interconnect may include dispersive elements. The dispersive elements may be less electrically conductive of current in a higher frequency range than in a lower frequency range. In some embodiments, the second level interconnect may include a socket having dispersive contacts. The contacts may be coupled to core power conductors on the power distribution bus.

A filter for reducing radiated emissions in switching power converters such as a motor drive is disclosed. The switching power converter modulates a DC voltage input to generate a desired AC voltage output. Capacitors are connected in parallel between each output phase and a common connection, which may be a ground connection. The magnitude and layout of the capacitors are selected to minimize current conducted by the capacitors. The capacitors may be surface mount technology located proximate to the switching devices or the capacitors may be incorporated in the circuit board on which the switching devices are mounted. The filter may be applied to any of the switching elements in a motor drive, such as the inverter section, an active rectifier section, or a switched mode power supply.

The invention discloses an optimization method for electromagnetic compatibility fault repair by adopting electromagnetic compatibility test over-standard strategies. In the method, a conducted emission curve, a conducted susceptibility curve, a radiated emission curve and a radiated susceptibility curve are used and are respectively compared with requirements of national military standards to obtain over-standard areas; according to electromagnetic vulnerability weights of different frequency ranges, an area weighted integration method is adopted to quantify the over-standard areas to obtain respective weights; and finally the respective weights are introduced to obtain electromagnetic compatibility weight expected values of helicopter-borne equipment. By virtue of index quantification and weight allocation, the electromagnetic compatibility interference faults of the helicopter-borne equipment are associated with the electromagnetic compatibility of the entire helicopter, factors such as electromagnetic compatibility conducted emission, conducted susceptibility, radiated emission, radiated susceptibility and electromagnetic compatibility classification of all helicopter-borne equipment are comprehensively considered, the index quantification and the corresponding weight allocation are conducted to obtain degrees of influence of the electromagnetic compatibility interference faults of the helicopter-borne equipment on the electromagnetic compatibility of the entire helicopter are obtained, the priorities of the repair sequences of the electromagnetic compatibility interference faults of the helicopter-borne equipment are determined and a basis is provided for determining sequences for electromagnetic compatibility rectification.

A method of transmitting high speed serial data with reduced levels of radiated emissions is disclosed. A transmitting device scrambles data utilizing a pseudo-random number sequence generator. Scrambling the data eliminates transmission of repeated data sequences. The transmitting device similarly scrambles idle pairs of data between data transmissions to eliminate an additional source of repeated data sequences. The scrambled and encoded data is transmitted to a receiving device. The receiving device also includes a pseudo-random number sequence generator. Synchronization of the two pseudo-random number sequence generators occurs by utilizing control characters of the data frame being transmitted. Each of the pseudo-random number sequence generators is configured to generate the same sequence of numbers and is initialized to start with a first number in the sequence of numbers corresponding to the first byte of data being transmitted or received.

An apparatus for drying a paint applied onto a bodywork of a motor vehicle, which apparatus is provided with a radiating assembly equipped with at least one catalytic panel fed with hydrocarbon gas for generating a first infrared radiation emission spectrum in the short-wavelength infrared band, in virtue of a catalytic reaction between the hydrocarbon gas and the oxygen present in the air, and arranged so as to emit the infrared radiations towards the bodywork to dry the paint, and is further provided with at least one air supplying device for blowing compressed air onto the catalytic panel so as to affect the catalytic reaction and generate a second infrared radiation emission spectrum distributed on the entire short-wavelength infrared band and broader than the first emission spectrum.

An RJ 45 connector for unshielded CAT5 cable has electromagnetic-interference-suppression circuitry to meet the Class B conducted and radiated emissions standard. The connector comprises, in addition to signal-conditioning transformers, a current-blocking ferrite and a plurality of pairs of common-mode filters, one pair for each conductor of each active twisted pair of the cable. Each pair of filters is connected in series with each other between a conductor of an active twisted pair and a transformer winding, and meets or exceeds the impedance, reactance, and resistance curves of FIGS. 2-4. The ferrite is connected in series with each conductor of each inactive pair of the cable and across a capacitor to ground, and meets or exceeds the impedance, reactance, and resistance curves of FIGS. 5-7.