Abstract: An antenna system and method for a plurality of plasma antennas driven by means of an optical driver. In one embodiment the driver comprises one or more lasers which may be modulated by one or more electro-optical modulators to produce a modulated laser signal. The modulated laser signal may be supplied to the plasma antenna by optical fibers whereby the photons from the modulated signal impart momentum to the plasma particles. The plasma particles, which may include unbound electrons, oscillate in accord with the modulated laser signal to radiate electromagnetic energy. In one embodiment, the plasma antenna is operated at a frequency near the resonant frequency of the plasma to form a more efficient radiator requiring a smaller size than to a metallic antenna. In another embodiment a plurality of closely spaced plasma antennas are operated with different plasma resonant frequencies such that one plasma antenna is electrically invisible with respect to another plasma antenna.

Abstract: An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved noise channels with reduced signal content. Directional detectors may be magnetometers aligned with the magnetic field, or antennas aligned with the electric field, of signal or noise sources. Alignment may be performed by beam steering of the outputs of a three-channel detector, which may detect both signal and noise.

Abstract: A slot antenna has a feeding waveguide extending in a longitudinal direction for guiding electromagnetic waves, with at least one slot constructed in a broad side of the waveguide for emitting an electromagnetic wave. The slot is surrounded on the exterior side of the waveguide by an arrangement for rotating the polarization direction of the electromagnetic wave emitted by the slot. According to the invention, the slot is constructed in the longitudinal direction of the waveguide and the arrangement surrounding the slot is a rectangular polarizer waveguide. One opening of the polarizing waveguide is connected with the broad side of the waveguide and the other has an aperture via which the wave excited by the slot in the polarizer waveguide is emitted.

Abstract: A dielectric covered continuous slot (DCCS) antenna operable at RF frequencies. The antenna includes a conical or cylindrical dielectric radome structure having a nominal thickness equal to one quarter wavelength at a frequency of operation of the antenna. A conductive layer is defined on a contour surface of the radome structure, with a plurality of continuous slots defined in the conductive layer. The slots extend circumferentially about the longitudinal axis of the antenna and are spaced apart in a longitudinal sense. A serpentine end-fed signal transmission structure is disposed within the radome structure for carrying RF feed signals from an excitation end of the structure to a second end of the transmission structure.

Abstract: It is an object of the invention to provide a meander antenna that is smaller and lighter, in which the resonance frequency easily can be tuned, as well as a method for tuning its resonance frequency. The meander antenna comprises a meandering conductor on the surface of a substrate. The meander antenna is provided with a short-circuit conductor line that forms a short-circuit between two parallel opposing lines into which the conductor is bent, or an open conductor line in which a line short-circuiting the two parallel opposing lines is open. The resonance frequency can be tuned and lowered by cutting open the short-circuit line or increased by short-circuiting the open conductor line.

Abstract: A dual-band monopole antenna mainly comprises a microwave substrate, a first horizontal radiating metallic line, a second horizontal radiating metallic line, a vertical radiating metallic line, a feeding point, and a ground plane. The microwave substrate includes a first surface and a second surface. The first horizontal radiating metallic line is printed on the first surface. The second horizontal radiating metallic line is printed on the first surface. The vertical radiating metallic line is printed on the first surface, wherein the first horizontal radiating metallic line and the second horizontal radiating metallic line respectively intersect the vertical radiating metallic line at different positions. The feeding point is disposed on the vertical radiating metallic line, and a ground plane is printed on the second surface of the microwave substrate.

Abstract: The instant invention relates to a solid state low voltage power supply controller which reduces a conventional 120 volt AC power source to 12 volt pulsating DC for the purpose of operating a single “point of use” light source wherein the low voltage power supply is in proximate location to the light source. A pulse width modulator integrated circuit operating in conjunction with a field effect transistor induces energy in the secondary of a step-down transformer to provide a reduced pulsating DC current to a lamp load. A feedback voltage from the secondary winding of the stepdown transformer operates to set the gain of internal circuitry of the integrated circuitry to provide a predetermined constant pulsating DC voltage and a predetermined limited range of power wattage. A feedback voltage operates to reduce current drawn by overcurrent demands on the primary of the transformer.

Abstract: A discharge lamp lighting device having: a power control circuit for controlling power to be supplied to a discharge lamp; an AC converter circuit provided between the power control circuit and the discharge lamp for converting a DC current into an AC current; a timer circuit for controlling operation of the AC converter circuit; and an igniter circuit for generating a high voltage pulse to thereby activate the discharge lamp; wherein the timer circuit includes: a second timer for starting as a timer in accordance with a power supply activating signal; a first timer for starting as a timer in accordance with lighting of the discharge lamp; and an OR circuit for outputs of the first and second timers. Thus, the DC lighting time is designed to be not changed and stable lighting can be achieved.

Abstract: A ceramic chip antenna, which has a small size and a broad bandwidth, is provided. The ceramic chip antenna consists of a ceramic body with cuboid shape, a conductor wound helically inside the ceramic body, and signal-feed terminal formed on a surface of the ceramic body. The ceramic chip antenna with a helical conductor patterns formed in a symmetrical dipole shape is provided, which has a high gain value and excellent radiation characteristics. Also, it can be built-in inside a mobile terminal due to its small size. The ceramic chip antenna according to the present invention can have a broad bandwidth that satisfies the variable frequency of the present mobile communication system.

Abstract: An antenna device is disclosed, which is intended for a portable radio communication device. The communication device includes a signal generating component having a signal output, said output defining a signal generating circuit impedance. The antenna device includes a substantially planar conductor having an associated impedance and preferably extending in a first dimension greater than approximately one-quarter of a predetermined operational wavelength. The antenna device further includes a matching network which is coupled to the signal generating output. The matching network having a substantially planar dielectric substrate and a conductive meander element and a conductive trace element, wherein said matching network transforms the impedance of the signal generating component to approximate the impedance of the planar conductor element.

Abstract: A tunable artificial dielectric material achieves the weight reductions made possible in U.S. Pat. No. 6,075,485 and further achieves even higher resonant frequency tuning ratios. In one embodiment of the invention, the artificial dielectric substrate for a patch antenna comprises alternating low and high permittivity layers, with the high permittivity layers each comprised of printed capacitive Frequency Selective Surface (FSS). An example FSS of the invention has a voltage tunable effective sheet capacitance by virtue of varactor diodes integrated into each unit cell. By appropriate adjustment of the bias voltage across the varactor diodes, the amount of the electric field stored in the substrate can be varied, which further varies the resonant frequency of the patch antenna.

Abstract: A phased array antenna includes a circuit board and a balanced, series fed antenna array formed from a plurality of antenna elements positioned in at least two spiral antenna arms on the circuit board. At least one signal feed point is positioned at a center portion of the spiral antenna arms for series feeding the antenna array and conducting transmitted and received signals and breaking up frequency scan and grating lobes.

Abstract: A method of wireless communication is disclosed, in which polarization diversity can be utilized to improve fading performance or to increase the capacity of the communication channel in a scattering environment. Complementary signal information is impressed upon, or derived from, corresponding electric and magnetic polarized field components of a transmitted or intercepted electromagnetic wave. Four, five, or even six independent signal channels can thereby be utilized for communication using a localized antenna arrangement.

Abstract: A multi-frequency band antenna may include a base and a first antenna array including a plurality of spaced apart monopole antenna elements extending outwardly from the base a first distance for operating at a first frequency. Further, the multi-frequency band antenna may also include a second antenna array including a plurality of spaced apart antenna elements arranged outside the first antenna array and extending outwardly from the base a second distance less than the first distance. The second antenna array may be for operating at a second frequency lower than the first frequency.

Abstract: A vehicle antenna light assembly (10) that is adapted to be removably attached to a vehicle antenna tip (90) as located on a vehicle antenna (92). The assembly (10) is comprised of an electronic light enclosure (12) that encloses a battery powered electronic light circuit (80) that sequentially activates a set of LED'S when the external environment is dark and the vehicle is moving. The enclosure (12) is attached to the antenna tip (90) by utilizing an enclosure attachment cup (32), a central attachment structure (42), and a compression washer (68). The attachment is accomplished by attaching the structure (42) to a lower section (18) of the enclosure (12). The cup (32) followed by the compression washer (68) is then inserted over the antenna (90) and the cup (32) is attached to a cup attachment cavity (60) located on the structure (42). When the attachment sequence is complete, the washer (68) bias the antenna tip (90) against the base (44) of the structure (42) to maintain a rigid attachment.

Abstract: A method and circuit for driving a plasma display panel are provided which are capable of preventing a useless display, irrespective of characteristics of a driving power source. In the method for driving the disclosed plasma display panel, a pulse having an erasing pulse which causes a maximum potential difference between sustaining electrodes being adjacent to each other to reach at least sustaining voltage is applied, immediately after power is applied, to a scanning electrode.

Abstract: A microwave antenna for an aircraft including a reflector element with a front surface and a rear surface. A horn is mounted to the front surface of the reflector element and an orthomode transducer is mounted to the rear surface of the reflector element. The orthomode transducer is coupled to the horn. Solid state power amplifiers that amplify a microwave signal to be transmitted and low noise amplifiers that amplify a received microwave signal are coupled to the orthomode transducer. The solid state amplifiers and the low noise amplifiers are also located on the rear surface of the reflector element.

Abstract: In a horn antenna apparatus for use in an antenna system for radar, some of the excited radio waves in a TE11 mode in a radio-wave input portion 1 are converted to those in a higher mode in a waveguide portion 5. As the inclination of a line of intersection S of the waveguide portion 5 is not fixed but continuously varied, the higher mode such as a TM11 mode and TE12 mode and the like is excited everywhere in the direction of the axis Z of the waveguide portion 5. Then the configuration of the line of intersection is determined so that an amplitude and a phase as the generated quantity of higher mode such as the TM11 mode generated in the waveguide portion 5 conform to desired values with respect to each higher mode.

Abstract: A connection mechanism for snap-fitting an antenna into a hole in a receptacle, the receptacle typically being part of a 2-way mobile communication device. A latch, preferably mounted on a sleeve, including a stem and a latch head, extends around a circumference of the antenna. The latch is inwardly depressible to insert the antenna through the hole and is able to return to a non-depressed position to retain the antenna against the second end.

Abstract: A Planar Inverted F-Antenna (PIFA) comprising: a radiating element placed above a dielectric carriage with four side walls; a ground plane positioned below the dielectric carriage; a short circuiting element at the front edge of the radiating element; a feed tab at the front edge of the radiating element; vertical planes formed along the right and left edges of the radiating element forming capacitive loading plates; a first reactive loading slot formed in the radiating element between the short circuiting element and the left edge thereof; the open end of the first reactive loading slot being at the front edge of the radiating element; a second reactive loading slot formed in the radiating element between the feed tab and the right edge thereof; the open end of the second reactive loading slot being at the back edge of the radiating element; conductive stubs at the front and back edges of the radiating element for tuning lower and upper resonant frequencies; a conductive strip having a vertical attachment in