Abstract: A method and apparatus for performing far-field power extraction are presented. The method includes receiving an electromagnetic radiation signal, rectifying the signal to produce a direct current (D.C.) voltage and providing the D.C. voltage to a circuit. A far-field power extraction circuit includes an antenna for receiving an electromagnetic radiation signal, a rectifier for rectifying the electromagnetic radiation signal. The circuit may further include a charge pump for amplifying the rectified voltage, an impedance matching network for coupling the antenna to the rectifier and a feedback tuning circuit for optimizing performance of the extraction circuit.

Abstract: A burglar alarm includes a main unit provided with a power supply voltage regulator circuit, a CPU circuit, an FET driving circuit, and an RLC oscillation circuit to convert digital code signals into analog signals, which are amplified and then carried via a power cord; and a decoding horn provided with a power supply voltage regulator circuit, a reference voltage circuit, an RLC oscillation circuit, a comparison circuit, a CPU circuit, and a horn voice driving circuit to decode and compare a received burglar-alarming signal and drive a horn to make vocal and sounding warnings. The burglar alarm is controlled via different frequencies that represent codes 1 and 0, or a base frequency and different pulse widths representing codes 1 and 0, so that the signals are carriable via the power cord without interference from noise on the power word.

Abstract: A system for communicating across conventional HVAC wiring is provided. The system includes a communication device having a communication module capable of inducing low power, high frequency current signals into a single control wire coupling, for example, a thermostat with a compressor. The communication module includes a power supply module that draws power sufficient to operate the communication module from the existing HVAC wiring, so as to eliminate any need for batteries or external power sources. A second communication module may be coupled to the single control wire. The second communication module operates as a transceiver sending communication signals to, and receiving communication signals from, the communication module. In one embodiment, the communication module is disposed within a building, for example coupled to an electronic thermostat, while the second communication module is disposed outside the building near the compressor.

Abstract: A non-contact IC card reading/writing apparatus having a superior reception characteristic includes a loop antenna, a resonant circuit unit, a wireless transmitting unit, and a wireless receiving unit. The resonant circuit unit, the wireless transmitting unit, and the wireless receiving unit are coupled to each other via any one of a directional coupler, a circulator, and an isolator.

Abstract: There is provided an arrangement of inductive couplers. The arrangement includes a first inductive coupler on a conductor, and a second inductive coupler on the conductor. The first inductive coupler has a first winding for a data signal, and the second inductive coupler has a second winding for the data signal. The arrangement also includes a connection module that connects the first winding to the second winding.

Abstract: The device has a primary circuit (1) that transmits energy or data via an intermediate circuit (2) to a secondary circuit (3) by means of induction. The intermediate circuit (2) has a very low quality factor. The inductive coupling between the intermediate circuit (2) and the secondary circuit (3) is reduced by inserting an additional leakage inductor (Ls ) so that energy or data is transmitted from the primary circuit (1) to the secondary circuit (3) as effectively as possible. This has the effect of lessening the damping effect of the intermediate circuit (2) on the secondary circuit (3).

Abstract: A multiband antenna system includes a multiband antenna adapted to receive signals in a given frequency range, such as CB, and a trap to isolate signals in the tire pressure monitoring frequency ranges so that when it is mounted to the exterior of a vehicle in conventional manner, it will optimally receive signals sent from tire pressure monitors in the wheels. The system includes a multiplexer circuit that connects to tire pressure monitoring apparatus and isolates the tire pressure monitoring frequencies from CB frequencies. The antenna and multiplexer circuits are capable of simultaneously handling other frequencies as well such as AM/FM.

Abstract: System and method for detecting, monitoring and evaluating hazardous situations in a structure includes the use of an expert system and, to the extent necessary, fuzzy logic in the generation of solution sets. Sensor units having two-way communication capability are strategically located in a structure or in a matrix of structures. These units are high-level multifunctional detectors, RF and other wireless or hardwired communication modules and signal generating systems that may communicate with a base station, with other modules and/or may have onboard logical solution generation capacity.