Abstract: A linear acceleration system comprises one or more accelerating stages along an axis and a unipolar electrostatic quadruple lens in series with the one or more accelerating stages. The unipolar electrostatic quadruple lens focuses an ion beam in a direction transverse to the axis. The unipolar electrostatic quadruple lens includes a switching circuit, a first pair of electrodes, and a second pair of electrodes. The switching circuit controllably connects to ground and a first voltage potential. The electrodes of the first pair are located opposite each other and are connected to the switching circuit. The electrodes of the second pair are also located opposite each other and connected to the switching circuit. The second pair of electrodes are biased to a second voltage potential.

Abstract: An efficient power conversion circuit for driving a fluorescent lamp uses a minimum pulse generator circuit to control the minimum on-time of a time modulated signal to increase the dimming range of the fluorescent lamp operating over a wide range of temperature and supply voltage. A minimum number of lamp current cycles with respective amplitudes above a preset threshold is typically required to avoid flickering or shimmering during minimum brightness. The minimum pulse generator circuit counts the lamp current cycles and adjusts the on-time accordingly to guarantee the minimum number of cycles with respective amplitudes above a preset threshold under all operating conditions.

Abstract: A full color fiber plasma display device includes two glass plates sandwiched around a top fiber array and a bottom fiber array. The top and bottom fiber arrays are substantially orthogonal and define a structure of the display, with the top fiber array disposed on a side facing towards a viewer. The top fiber array includes identical top fibers, each top fiber including two sustain electrodes located near a surface of the top fiber on a side facing away from the viewer. A thin dielectric layer separates the sustain electrodes from the plasma channel formed by a bottom fiber array. The bottom fiber array includes three alternating bottom fibers, each bottom fiber including a pair of barrier ribs that define the plasma channel, an address electrode located near a surface of the plasma channel, and a phosphor layer coating on the surface of the plasma channel, wherein a luminescent color of the phosphor coating in each of the three alternating bottom fibers represents a subpixel color of the plasma display.

Abstract: An ultra-wideband antenna for operating in a frequency is disclosed wherein a monopole antenna extends from a ground plane. The monopole has an effective length L of one quarter wavelength at the lowest frequency f1. A dielectric resonator antenna (DRA) surrounds the monopole antenna for resonating at substantially between or at two and three times the lowest frequency f1, the DRA is of a height of less than ¾ L and is disposed in such a manner as being above the ground plane and either contacting or spaced therefrom by a gap G, wherein 0?G?0.2 H. The ultra-wideband antenna is of a much greater bandwidth than the sum of bandwidth of the monople or the DRA alone.

Abstract: An antenna device, comprising a dielectric substrate board (10), dipole means (16) formed on the substrate board (10), and reflector member (48, 70, 72) having first and second reflective surfaces which are aparallel to each other define a first angle between each other. A positional relationship between the substrate board (10) and the reflector member (48, 70, 72) is such that the substrate board (10) and a vertex of the first angle (?) substantially lie in the same plane and the first and second reflective surfaces lie on opposite sides of the plane, a second angle defined between the substrate board (10) and the first reflective surface being different from zero each. In this way, an antenna device suitable for use in a broad variety of applications is provided which allows easy modification of its antenna characteristics by adjusting the angle between the reflective surfaces and/or the angular position of the reflector member (48, 70, 72) with respect to the substrate board (10).

Abstract: A microwave powered lamp head assembly includes a shutter assembly which may be activated to selectively allow transmission of light from the microwave powered lamp bulb. The shutter assembly allows unrestricted airflow when it is in the closed position so that the active lamp bulb may still be cooled, while preventing the transmission of UV radiation through the shutter. The shutter assembly is in close sealing relation with respect to the optical cavity holding the lamp bulb when in the closed position to minimize the escape of UV radiation.

Abstract: A motion detector circuit arrangement having multiple modes of operation for energizing a light at a nominal full-brightness illumination level in response to motion. Background level circuitry provides a dual-use lighting level signal that indicates the background levels with which the light may be energized in the absence of motion when operating in the various modes. The dual-use level signal is applied to cause the light to be energized at the desired background level and is further applied to set at least one other characteristic of the motion-activated light associated with the selected background level. The dual-use level signal may be applied to activate and establish an intermediate background lighting level to provide accent mode lighting and also be applied to disable a manual override capability. The manual override capability is preserved in security mode so that it will operate when these is no background lighting.

Abstract: Systems and methods for ignition and reignition of unstable electrical discharges wherein a secondary electrode positioned is between a set of primary electrodes and a high voltage is applied between the secondary electrode and successive ones of the primary electrodes to produce pilot discharges that ionize a gas there between and thereby reduce the voltage necessary to ignite a primary discharge between the primary electrodes. Power is provided to the secondary electrode by a circuit which is independent of the circuit that supplies power to the primary electrodes and generates voltage pulses which are substantially higher than the voltage between the primary electrodes.

Abstract: A dual polarized variable beam tilt antenna (10) having a plurality of offset element trays (12) each supporting pairs of dipole elements (14) to orient the dipole element pattern boresight at a downtilt. The maximum squint level of the antenna is a consistent downtilt off of boresight and which is at the midpoint of the antenna tilt range. The antenna provides a high roll-off radiation pattern through the use of Yagi dipole elements configured in this arrangement, having a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, and is operable over an expanded frequency range.

Abstract: An internal antenna for wireless devices comprising a ground plane and a planar loop antenna. The shorted loop antenna is provided with a gap and operates at a quarter wavelength. The compact single feed dual or multi band internal antenna is realized either through composite assembly of an active outer and inner radiating elements or by a selective combination of an active outer radiating element and a parasitic inner radiating element. The inner radiating element of the proposed invention is completely encompassed within the outer radiating element. The resonant tuning of the internal antenna is accomplished by means of the matching stub and capacitive loading plates with the matching stubs being entirely internal to the outer radiating element.

Abstract: According to some aspects of this invention, a compact, broadband active receiving antenna uses one or more high transconductance transistors such as Field Effect Transistor(s) paired with another Transistor and arranged in a Cascode amplifier configuration. Some embodiments involve a single high transconductance transistor arranged with a high efficiency transformer in a nondissipative feedback loop to improve linearity and dynamic range. The devices have a high input resistance, low input capacitance, low noise and a very high second and third order Intercept Point. Since the gain is primarily a function of the amplifying electronics, it is not necessary to increase the directivity of the antenna to achieve higher gain.

Abstract: A Planar Inverted F Antenna (PIFA) and a radio module integrated into a single module. The present invention permits the PIFA to be removably secured on the top of a radio chip module. In one embodiment of the invention, a non-conductive antenna frame is removably secured to a radio chip. A radiating element or “patch” is then secured to the top of the frame. The patch has feed and shorting pins connected thereto. The integrated radio/antenna system can be mounted on a PCB using standard surface-mount techniques and the feed and shorting pins can be soldered to the PCB. In another embodiment of the invention, a cover is removably secured to the frame to retain the patch on the frame. The cover has a window to permit the feed and shorting pins to be soldered to the PCB.

Abstract: A present embodiment of the invention solves the problem by providing an antenna control system in a wireless communication system. A communication interface transfers a control signal to an antenna controller. The antenna controller processes the control signal. The antenna controller then substitutes an antenna with another antenna based on the control signal. Advantages of the embodiments include providing a reliable wireless communication system that decreases the number of lost calls by increasing the availability of antennas. Other advantages include providing flexible antenna coverage to an area by remotely controlling the antenna through a public communication network by means of a modem.

Abstract: A reception antenna arrangement for motor vehicles for the GHz frequency range that is formed as a combined system for the reception of circularly polarized waves and/or vertically polarized waves by a plurality of dipole antennas. Their length is not greater than ¾ of the wavelength. To form a diversity function, at least one switching or reversing device (2) is provided so that at least two signals that are different in terms of diversity and received from the dipole antennas are alternatively supplied to at least one antenna connection point for diversity reception so that one or several more favorable reception signals can be selected and provided to the antenna amplifiers.

Abstract: A xenon arc searchlight incorporates a high frequency/high efficiency electronic circuit that allows lamp ballasting and charging of the system battery to occur over a wide range of external DC power supplies. The xenon arc searchlight has a converter circuit coupled to both the battery, the ballasting circuit and the arc lamp for converting DC voltage from the battery to pulse width modulated switched current to the arc lamp in which the DC voltage is switched by parallel switching transistors. The ballisting circuit is controllable by a switch to vary current supplied to the converter circuit and hence intensity of the lamp which discrete steps in intensity of the lamp are not visually perceptibly different between one step to a next step in the sequence of steps of the current to the lamp. The lamp, ballast, battery and charger are provided in a single rugged package.

Abstract: Antenna system (100) with dynamically adjustable ground plane spacing. The system includes at least one antenna radiating element (106, 108) and a first conductive ground plane (110, 120) spaced from radiating element (106, 108). The first conductive ground plane is comprised of a dielectric structure (104) containing a conductive fluid (120).

Abstract: An antenna system for receiving communication signals from satellites having plurality of subplates, a plurality of antenna nodes supported on the top surface of each subplate, and an electronic control unit to which the subplates are fixed and aligned and a collapsible support stand fixed to the bottom of the electronic control unit opposite the subplates in which the subplates, electronic control unit and stand interconnect to form an easily assembled lightweight antenna assembly that may be disassembled into easily portable components.

Abstract: A sustain driving apparatus and method for a plasma display panel that is adaptive for reducing power consumption as well as stabilizing a driving waveform. In the apparatus, a voltage source has a half of the voltage required for a sustain driving of the plasma display panel. An energy recovering circuit is connected between the voltage source and the panel. The energy recovering circuit configures an LC resonance circuit by a switching to recover a power of the panel, thereby applying said sustain driving voltage to the panel.

Abstract: An antenna assembly for a motor vehicle and especially for an antenna structure on a window of such vehicle in which a support plate is provided between an antenna amplifier and the antenna structure and has at least one but preferably a plurality of spring contacts locked through openings in the support plate and having arcuate portions respectively engageable with contact points on the antenna amplifier and contact pads of the antenna structure.

Abstract: An emitter includes a plurality of types of emission units (for example, EL elements) with different emission aging characteristics, which can obtain good emission conditions even after a certain usage time has elapsed. A method of designing the brightness and a program for designing the brightness of the emitter, an electrooptical device and an electric device are also provided. Initial brightnesses of the emission units are set such that a skew of emission lifetime between the emission units is within 20%.