Abstract: An antenna system for use in a communication system is provided. A first antenna is configured to receive a first signal having a first polarization. A second antenna is configured to receive a second signal having a second polarization and configured to receive a third signal having a third polarization. The second polarization is rotated from the first polarization. The third polarization is rotated from the second polarization.

Abstract: Paraboloidal antennas are common for very high frequencies (VHF) and into the cellular telephone systems and personal communication systems (PCS). Paraboloidal antennas are often used at the base station of either cellular telephone antennas, PCS antennas or both. To avoid possible channel drop out because a sharp focal point of the antenna is misaligned by improper installation or harsh weather conditions. For base stations for cellular telephone systems and/or systems, PCS, a generally paraboloidal antenna that has a less sharp focal point so there is a antenna lower gain, but less relative signal degradation because of weather or other misalignment of the antenna. In such cases, the lower gain, but higher immunity to drop-out more than justifies such arrangements.

Abstract: A capacitive load circuit and a plasma display apparatus using such a circuit, being able to use a sustain transistor having a voltage rating in accordance with a sustain voltage even when a voltage larger than the sustain voltage is applied to a sustain electrode, have been disclosed, wherein a switch whose one end is connected to a capacitive load is comprised and when a third voltage, whose voltage difference from a second voltage is larger than the voltage difference between a first voltage and the second voltage, is applied to the capacitive load, a fourth voltage is selectively applied to the other end of the switch.

Abstract: A ballast circuit is provided having an input, an output for coupling to an electric discharge lamp and an oscillation circuit for illuminating the lamp. A circuit may be included for sensing when a voltage on an input to the oscillation circuit exceeds desired levels. The ballast circuit may be shut down, limited or otherwise controlled to reduce the possibility of ballast failure.

Abstract: An antenna system for a portable transceiver device comprises an antenna structure for transmitting and receiving RF signals. The antenna structure includes multiple feeding ports having a common structure fully coupling multiple antennas together. This antenna structure is made of a conductor that can be surface mounted over a nonplanar surface. When the conductor is mounted on a nonplanar surface, the antenna structure extends in three dimensional space around the portable communications device.

Abstract: A field emissive display (40) having an anode plate (10) coupled to a cathode plate (20) and a method for manufacturing the field emissive display (40). A substrate (21) of the cathode plate (20) is manufactured or selected such that its coefficient of thermal expansion substantially matches that of the anode plate (10), i.e., the coefficients of thermal expansion of the cathode plate (20) and the anode plate (10) are within ten percent of each other. The cathode plate (20) is coupled to the anode plate (10) by means of a frit structure (41) whose coefficient of thermal expansion preferably substantially matches that of the cathode plate (20) and the anode plate (10). A control circuit can be mounted to the bottom surface of the field emissive display (40).

Abstract: The neck of a typical PAR lamp tends to focus the light issued in the neck or heel of the lamp back onto the lamp seals. The focused lost light then tends to overheat the seal and shorten lamp life. A practical solution is to intercept this lost light with a light absorbing layer. The light is then converted to heat in the layer. The heat is then re-radiated in an unfocused fashion with only a small portion of it redirected to the seal area. The interception layer may be formed as a black top coating on the neck interior or the neck exterior if the reflector is otherwise light transmissive. Alternatively, the neck may be formed from a translucent or opaque material that then converts the light into heat in the body of the reflector wall. The neck is then specifically not metallized so as to reflect light from the internal neck surface back to the lamp seal.

Abstract: The invention relates to an integrated antenna for a portable computer. The portable computer has a main frame. The integrated antenna comprises a substrate, a first radiating metal strip, a second radiating metal strip, a ground plane, at least one first connecting metal strip and second connecting metal strip. The substrate has a connecting portion for connecting to the main frame. The first radiating metal strip is used to induce a first resonance, and the second radiating metal strip is used to induce a second resonance. The first connecting metal strip connects to the first radiating metal strip and the second radiating metal strip. The second connecting metal strip connects to the second radiating metal strip and the ground plane. The integrated antenna of the invention is mounted to the main frame of the portable computer. The length of a coaxial cable can be reduced. Therefore, the transmission loss and cost can be reduced.

Abstract: A Planar Inverted-F Antenna (PIFA) and the related application system are disclosed. The PIFA is formed on a base board having a circular hole and a slot, and the PIFA comprises a first radiating conducting line that is formed conformally around the circular hole; a second radiating conducting line that is formed conformally around portion of the slot; and a straight radiating conducting line located between the circular and the slot, wherein one end of the first radiating conducting line is connected to one end of the straight radiating conducting line, and one end of the second radiating conducting line is merged into portion of the outer side of the first radiating conducting line adjacent to the aforementioned end of the first radiating conducting line, and an opening is formed with the straight radiating conducting line and the first radiating conducting line.

Abstract: An antenna for a tire pressure detector is installed on an RF circuit board of the tire pressure detector. The antenna has a seat with a bottom plate. A post is uprightly formed on the bottom plate. A plurality of positioning members evenly formed at an outer periphery of the post. A wire electrically connected with the RF circuit board is coiled round the post and positioned in the positioning members. A cover has a body provided outside the seat. A bolt is inserted through the cover to fasten the antenna on the RF circuit board. The antenna has a low manufacturing cost, and is convenient to be installed.

Abstract: An electromagnetic antenna apparatus exhibits a generally continuous signal response between a first frequency and a second frequency, and further exhibits a deviation from the signal response in a frequency region centered substantially at a selected frequency between the first frequency and the second frequency. The apparatus includes: (a) an antenna transceiving element; (b) a feed structure coupled with the antenna receiving element for communicating transceiving signals with the antenna transceiving element; and (c) a discontinuity structure in the antenna transceiving element coupled with the feed structure. The discontinuity structure is configured for effecting return of selected transceiving signals to the feed structure as return signals. The return signals effect the deviation.

Abstract: This application discloses the technique of the RF plasma processing using two RF waves of different frequencies, where plasma is generate and retained sufficiently and stably. The first frequency is for generating plasma by igniting a discharge, and the second frequency is for generating self-biasing voltage at a substrate to be processed. The wave of the second frequency is applied with a time-lag after applying the RF wave of the first frequency. This application also discloses the impedance matching technique in the RF plasma processing, where impedance to be provided is optimized both for igniting the discharge and for stabilizing the plasma.

Abstract: Body-worn antennas operate in combination with a direction finding processor to be able to detect the presence of electromagnetic radiation involved in communication as well as the direction of the source of the electromagnetic radiation. In one embodiment, a number of wide bandwidth antennas, 2 MHz to 40 GHz, are incorporated into a body-worn vest or garment such that an individual wearing the vest is being provided with a wearable system for indicating the direction of the source of incoming signals. If the orientation and geographic location of the individual are known via the use of a compass and/or by GPS receiver, the source of the radiation can be pinpointed by triangulation with inputs from other body-worn units. For omni-directional detection, pairs of antennas are provided with feed points or spigots which are fed in phase.

Abstract: A signal sensing module senses an RF signal and produces one or more secondary signals representative of the RF signal. An impedance matching control module generates a control signal, based on the one or more secondary signals, which is indicative of an impedance mismatch between a load and a communications device. The control signal is then applied to at least one variable impedance device to adjust the impedance of an impedance matching network and thereby reduce the impedance mismatch between the load and the communications device. In an embodiment, the at least one variable impedance device is a barium strontium titanate, thin film, parallel plate capacitor. In other embodiments, other variable impedance devices such as other types of thin film capacitors or varactor diodes are used to adjust the impedance of the impedance matching network.

Abstract: A multiple-surface antenna, and a method of receiving signals using an antenna, are disclosed. The multi-surface antenna includes a multi-surface dielectric substrate and a conductive trace formed on at least two surfaces of the dielectric substrate. The conductive trace is formed in a predetermined pattern. The predetermined pattern may be a crossing pattern, or a series of symmetric shapes. The multi-surface dielectric substrate, having the trace formed thereon, may then be integrated entirely within a telephone handset. The method includes providing a multi-surface dielectric substrate, printing on at least two surfaces of the dielectric substrate a conductive trace formed into a periodic pattern, receiving at least one signal at the conductive trace, passing the received signal through at least a portion of the conductive trace, and feeding the received signal from the conductive trace to a coupled receiver. The coupled receiver may be a cellular or cordless telephone handset.