59results about How to "Reduce radio interference" patented technology

A shielding arrangement for preventing AM radio interference when a wireless charger is used in a vehicle has a plurality of parallel conductors arranged at a distance from one another responsive to a frequency desired to be attenuated. An interconnection arrangement includes a solid conductive junction and connects the conductors to one another without forming loops, and to ground. The conductors are traces disposed on a PCB. Additional parallel conducts are disposed on the other side of the PCB at an orthogonal orientation with respect to the first conductors. The spacing between the conductors is determined in response to the frequency desired to be attenuated, as well as frequencies thereabove that are desired to be propagated therethrough, such as mobile telephone signals. The solid conductive junction that is disposed on the printed circuit board is electrically and thermally conductive, such as copper.

The invention relates to a method for predicting radio disturbance of an electric transmission line by using an improved BP (back propagation) neural network. The method comprises the following steps of acquiring and preprocessing data parameters; establishing a BP neural network predicting model of the data parameters; performing optimal training on the BP neural network by using a genetic algorithm and a simulated annealing algorithm; and predicting radio disturbance of the electric transmission line by using the network. The method is high in prediction precision, high in convergence and high in stability; the problem that the BP neural network is caught in a local minimum point is solved; and the method has a great guiding significance on prediction of radio disturbance of the electric transmission line and research on reduction of radio disturbance.

A mobile communications system is described in which a mobile device is operable to communicate with base stations using a first radio technology and with other devices using a second radio technology. The mobile device maintains a control plane connection with a first base station and a user plane connection via a second base station. In case of an interference is detected due to concurrent use of the first and second radio technologies, the mobile device provides assistance information to the base stations, based on which the base stations alleviate the effects of the detected interference.

The invention relates to a mother-infant wireless observation system, which is a wearable wireless body sensor network, and comprises wearable body sensor network clothes, a mobile gateway for collecting and processing data and a human-machine interface which can be seen by a computer and a user. Four wireless human-body sensor nodes which measure the health conditions of a mother and a fetus in a real-time manner and record data in a real-time manner are arranged on the body sensor network clothes; and each wireless human-body sensor node comprises an antenna, a transceiver, a microprocessor, a built-in sensor and a battery pack. The mother-infant wireless observation system has the advantages of software and hardware design with low cost and low energy consumption, can be popularized widely and used for a long time, process and analyze the data transmitted back from the human-body sensor nodes and extract important information, and judge the pregnancy complications at the earliest possible time; and by adopting the anti-interference design, radio interference among the sensor nodes and between the sensors and environment are reduced, and the safety of important medical data can be ensured.

The RFID system 10 has an interrogator 11, an interrogator antenna 12 connected to the interrogator 11 to transmit a signal, and a radio wave reflection sheet 21 that reflects a signal transmitted from the interrogator antenna 12 and includes a part of a parabolic curve or a curve similar thereto. , The wireless tag 13 that communicates with the interrogator 11 by receiving and responding to a signal from the interrogator antenna 12 at least through the radio wave reflecting sheet 21 . The signal passing through without being irradiated to the wireless tag 13 is reflected by the radio wave reflection sheet 21 toward the inside of the radio wave reflection sheet 21 . Therefore, signal dispersion can be prevented, and the signal from the interrogator antenna 12 can be effectively used.

An animal deterrent system to be placed on structures such as electrical apparatus to deter and protect birds, wildlife and other animals. Specifically, a perching deterrent having a saddle made to fit over any desired member of a structure and deterrent extensions may be used separately or in combination. The deterrent extensions may protrude in various configurations from the above-mentioned saddle to inhibit, deter, or insulate animals contacting structures. Also possible is an insulator cap with spiral conductor covers.

The invention relates to a voltage converter, whose topology can be switched over between a boost converter and a SEPIC. According to the invention, the boost converter has ripple current compensation. As a result, the inductors used can be utilized in optimum fashion. A thyristor which is protected against breakdown triggering by means of a negative gate voltage is used as the changeover switch.

In a communications apparatus, a communication controller transmits and receives signals on any of plural channels. A channel switching controller is responsive to channel switching information selectively defining plural reception-waiting periods using the channels to alter a channel to be used by the communication controller. A neighboring node channel controller exchanges channel switching information with other nodes to manage the channel switching information received from the other nodes. When transmitting transmission signals, a transmission controller refers to the channel switching information of the other nodes, and controls repetitive transmission of the transmission signals on the channel thus searched for.

A microwave modular circuit-based radio antenna array receiver system of VHF (very high frequency) band from 55 MHz to 65 MHz is composed of two primary band-pass filters, two primary amplifiers, two secondary band-pass filters, a phase shift signal synthesizer module, a secondary amplifier and a tertiary amplifier connected in order; the band-pass filters, the amplifiers and the phase shift signal synthesizer module are all microwave modular circuits. The system is simple in design, convenient to adjust, small in size and low in cost.

The invention relates to a method for reducing the insulation overhead ground wire induction voltage of an alternating current transmission line. The method comprises the following steps that the insulation overhead ground wire induction voltage limit value U<0> and the circuit current I are determined; when an insulation overhead ground wire grounding point is selected to be at one end part, the insulation overhead ground wire transposition pitch 1<0> is calculated to be (8-15)*U<0>/I<km>, and a nearby tension rod tower is selected every ten points from the end part of an insulation overhead ground wire as transposition nodes for carrying out ground wire transposition or conducting wire transposition; and when the insulation overhead ground wire grounding point is positioned between two ends of the insulation overhead ground wire, the insulation overhead ground wire transposition pitch 2*1<0> is calculated to be (16-30)*U<0>/I(km), the nearby tension rod tower is selected every 2*1<0> from one end part of the insulation overhead ground wire as transposition nodes for carrying out ground wire transposition or conducting wire transposition, and in addition, the insulation overhead ground wire grounding point is arranged nearby the half transposition pitch of one transposition node. The method has the advantage that the induction voltage can be reduced to be within the set induction voltage limit value U<0>.

A microwave transceiver comprising a data buffer, an ACM module, a PA, and an antenna. The ACM module is configured to receive buffered data from the data buffer and to modulate the buffered data at amodulation format having a spectral efficiency, the PA configured to receive modulated buffered data from the ACM module, and to transmit amplified modulated buffered data, via the antenna, to a remote microwave transceiver at an output power. The modulation format is selected from a plurality of modulation formats based on a feedback signal from the remote microwave transceiver. The microwave transceiver further comprises a control module configured to monitor a buffer state of the data buffer, and to control the output power of the PA based on the buffer state.