Abstract: An antenna device comprising: a substrate; a radiation portion including a dielectric block arranged on one principal face of said substrate and a first conductor layer formed in a stereoscopic shape on a surface of said dielectric block; and a grounding conductor including a second conductor layer provided on other principal face of said substrate.

Abstract: An antenna assembly includes an electrical device (20) and an antenna coating (10). The electrical device includes a circuit board(22), an insulative cover (11) and a connection portion (24) pivotally interconnecting the circuit board and the insulative cover. The antenna coating is formed on the insulative cover and substantially covers the connection portion, thereby establishing electrical connection with the circuit board via the connection portion. By pivotally rotating the insulative cover on the electrical device, the antenna performance can be improved. Because the antenna coating is directly formed on the insulative cover of the electrical device, the antenna assembly has a simple structure.

Abstract: The invention relates to various advantageous embodiments of a plasma-accelerator configuration, especially for the configuration and design of electron sources used for ionizing the working gas and/or neutralizing the discharged plasma jet.

Abstract: The invention relates to a drift tube accelerator (1) for the acceleration of ion packets in ion beam acceleration systems, wherein a housing (2) consists of a longitudinally divided three-part vacuum tank (3) having a central unit (4) and a lower half-shell (3) comprising a structured lower steel block (15) and an upper half-shell (6) comprising a structured upper steel block (19). (The cavity arranged between the central unit (4) and the structured steel blocks (15, 19) has at least two acceleration regions (24, 25), between which there is arranged a magnetic focussing device (17), which focuses the ion beam from one region (24) to the next region (25).

Abstract: An energy recovery circuit of a plasma display panel and a drive method thereof are disclosed.

Abstract: A high pressure discharge lamp according to the present invention is a high pressure discharge lamp in which the top ends of a pair of electrodes opposed in a discharge vessel 2 of an arc tube 1 are formed each into a substantially semispherical shape and a protrusion 10 to form an arc spot is formed at each top end, wherein all of the relation: 0.3••L/I••1.0 for an inter-electrode distance L(mm) between the electrodes and a lamp current I(A) during stable lighting, the relation: 1.2••10?7••X/Y••1.1••10?5 for a molar amount X(mol) of bromine in the bromide sealed in the discharge vessel 2 and an inner volume Y(ml) of the discharge vessel 2, and the relation: 9••W3/2/I••65, for a weight W(mg) of tungsten at the top end of each electrode 3 formed into a substantially semispherical shape are satisfied, and the lighting frequency of a rectangular wave during stable lighting is 45 Hz or higher.

Abstract: A planner inverted-F antenna (PIFA) includes a ground plane, a rib-shaped radiation plate installed approximately in parallel with the ground plane, a feeding line installed on the rib-shaped radiation plate, a feeding contact installed on an end of the feeding line, and a ground contact electrically connected to the ground plane.

Abstract: Methods and systems to achieve linear and exponential control over a current to drive color LEDs have been achieved. Current digital-to-analog converters (IDAC) comprising each an exponential current digital-to analog converter and a linear IDAC, being cascaded to each other are used for a linear and an exponential control of a current driving a set of color LEDs, preferably RGB LEDs. The linear part of the IDAC, which is converting the mantissa of a floating-point number is used to control the color composition of the color LEDs. The exponential part of the IDAC, which is converting the exponent of the floating-point number is used to control the brightness of the color LEDs. While fading from one color to a next color a linear color change is required. The exponential part of the IDAC is used to dim the LEDs from bright to dark and vice versa. In order to get the visual perception of a linear dimming an exponential current change is required.

Abstract: An antenna device has a circular radiation plate with a diameter of substantially ½ wavelength in electric length faced to a ground plate with a first power supply port and a second power supply port in its periphery. The power supply ports are disposed at positions where straight lines connecting respective power supply ports to a midpoint of the radiation plate intersect at right angles. Four slits axisymmetric with respect the straight lines are disposed in radiation plate, and two sides of the periphery of each slit contact with each other.

Abstract: A multi-polarized forward feed and dish configuration for transmitting and/or receiving radio frequency (RF) signals is disclosed. The configuration comprises a conductive reflector dish, having a focal point and a vertex point, and a multi-polarized forward feed element positioned substantially at the focal point. The forward feed element comprises at least two radiative members each having a first end and a second end. The second ends of the radiative members are electrically connected at an apex point and are each disposed outwardly away from the apex point toward the vertex point at an acute angle relative to an imaginary plane intersecting the apex point.

Abstract: An electronic ballast for a discharge lamp is capable of dimming the lamp over a wide range, yet minimizing a color temperature deviation. The ballast includes a power converter which converts an input DC voltage into a lamp power for driving the lamp, and a dimmer providing a dimmer command of a varying dimming ratio in order to reduce the lamp power to a greater extent as the dimming ratio decreases. A controller controls the power converter to supply a high frequency AC current to the lamp in response to the dimming ratio decreasing to a predetermined level, and to reduce an RMS value of the high frequency AC current as the dimming ratio decreases past the predetermined level.

Abstract: A system and method for generating white light involves using a combination of white, red, green, and blue LEDs to produce white light and adjusting the emitted light in response to feedback signals. A light system has a light source that includes at least one white LED and multiple color LEDs and a spectral feedback control system configured to detect light that is output from the light source and to adjust the light that is output from the light source in response to the light detection. The spectral feedback control system may include a color sensor configured to provide color-specific feedback signals, a controller configured to generate color-specific control signals in response to the color-specific feedback signals, and a driver configured to generate color-specific drive signals in response to the color-specific control signals.

Abstract: An electronic ballast for a discharge lamp has a controller that increase luminous flux of the lamp to a stabilized level in a constant time irrespective of possible variations in lamp characteristic. The controller utilizes a reference lamp power table and a reference lamp voltage table respectively defining a reference lamp power and a reference voltage varying with time. The controller includes a voltage deviation detector that gives a voltage correction index indicating a voltage deviation between the reference voltage and a monitored lamp voltage. The voltage correction index is processed at an offset provider that gives an offset power. A target power generator is included to correct the reference lamp power in view of the offset power, thereby generating a target lamp power which is constantly updated and is supplied to the lamp.

Abstract: An electrodeless discharge lamp operating device including an electrodeless discharge lamp 3 and a ballast circuit 4, wherein the ballast circuit 4 includes: an AC-DC converter 5 for converting a phase-controlled AC voltage into a DC voltage; a DC-AC converter 6 formed so as to intermittently drive the electrodeless discharge lamp 3 due to the existence of an operating period during which a high-frequency voltage is applied to the electrodeless discharge lamp 3 so that the electrodeless discharge lamp 3 is operated, and an extinguishing period during which the generation of the high-frequency voltage is stopped so that the electrodeless discharge lamp 3 is extinguished; and a dimming controller 7 for detecting the turn-on of the phase-controlled AC voltage, for outputting an intermittent command signal that changes the ratio between the operating period and the extinguishing period to the DC-AC converter 6, and for outputting a signal that maintains an intermittent dimmable operating state even if dimming sta

Abstract: An antenna apparatus is mounted on a vehicle body provided with a spoiler made of an insulating resin. A feeder element is disposed in the spoiler such that the vehicle body serves as ground without providing a ground element in the spoiler.

Abstract: To realize high pressure-tightness and improvement in a high-frequency characteristic due to a low impedance between a shunt FET and a ground of a FET switch circuit. An antenna switch module comprising a switch circuit for switching between transmitting and receiving of a signal between an antenna and a transmitting portion and/or a receiving portion and having a shunt circuit, wherein a capacitor of the shunt circuit of the switch circuit is provided to a dielectric layered body, and remaining elements of the switch circuit are provided to semiconductor chips mounted on the dielectric layered body.

Abstract: An antenna device includes a ground conductor plate, and a radiating conductor plate made of a metal plate, which is spaced from the ground conductor plate. The radiating conductor plate is provided with adjusting means for adjusting the electrical length. Thus, the correction of the electrical lengths can be made even if there is a difference between the electrical lengths of the radiating conductor plate caused by assembling errors, etc. In addition, when the antenna device is used in a state in which it is connected to external equipment, the adjusting means allows the adjustment of the electrical lengths of the radiating conductor plate even if the electrical lengths of the radiating conductor plate are subjected to the electrical influence from the electrical equipment and its surrounding environment.

Abstract: An electronic ballast for a discharge lamp is capable of dimming the lamp over a wide range, yet assuring to operate the lamp efficiently with a minimum lamp power variation in compensation for a possible lamp characteristic variation. The ballast provides an unique voltage-wattage output characteristic which varies with a varying dimming ratio for reducing the lamp power as the dimming ratio decreases. The output characteristic is designed to follow a true lamp characteristic that the lamp voltage will decrease as the lamp power is reduced to a certain level. With this result, it is possible to give a wide voltage range within which the lamp power being supplied to the lamp is kept substantially constant irrespective of the lamp characteristic variation, thereby assuring to reduce the lamp power exactly as intended by the dimming ratio even in the presence of the lamp characteristic variation.

Abstract: A method of changing an antenna pattern in a radio apparatus and a radio apparatus comprising a planar antenna structure with a first and a second plane are provided. In the solution both planes are arranged to act as a radiator plane and as a ground plane and the apparatus comprises means for interchanging the usages of the planes.