Abstract: An apparatus has an improved antenna pattern for a cross dipole antenna. Such antennas desirably have an omnidirectional antenna pattern. Conventional cross dipole antennas exhibit nulls in their antenna patterns, which can cause antennas to deviate from a standard or specification. Applicant recognized and confirmed that the connection of a coaxial cable to the antenna arms is a cause of the nulls in the antenna pattern, and has devised techniques disclosed herein to compensate or cancel the effects of the connection. In one embodiment, the arms of the cross dipole antenna that are coupled to a center conductor of the coaxial cable remain of conventional length, but the arms of the cross dipole antenna that are coupled to a shield of the coaxial cable are lengthened by a fraction of the radius of the outer diameter of the coaxial cable.

Abstract: An electronic apparatus that includes a housing for housing an electronic component and an antenna body, the housing having a base body formed of a plate section and a side surface section, and a cover for covering an edge of the base body, the plate section including an antenna housing section and a protruding section, whereas the side surface section including an opening for communicating to the outside of the housing, and the antenna body having a plate piece-like shape with a length to be housed in the antenna housing section, having an antenna for radio communications and a bearing section with an insertion hole which penetrates front and back surfaces of the antenna body to receive insertion of the protruding section, the antenna body being housed in the antenna housing section between the plate section and the cover, and protruding from the housing when being rotated.

Abstract: A radio relay comprising: a housing configured to be released from a mobile platform onto a support surface; a radio mounted within the housing, wherein the radio is configured to relay radio frequency (RF) signals and to operate as a node in a telecommunications network; a first antenna mast having a proximal end and a distal end, wherein the proximal end is rotatably coupled to the housing; a first antenna element operatively coupled to the radio and mechanically coupled to the distal end; and an antenna mast rotation mechanism mounted within the housing and the proximal end such that the antenna mast rotation mechanism is configured to upwardly rotate the first antenna mast to a raised position such that the first antenna mast is substantially parallel to the ambient gravity vector.

Abstract: An antenna for electromagnetic compatibility testing, that includes an upper plate and a lower plate having parallel longitudinal axes, maintained at a distance from each other, and mechanically connected to each other at each of their longitudinal ends by longitudinal plates. The upper and lower plates and longitudinal plates define a space. The upper and lower plates and the longitudinal plates are mounted so as to be capable of movement relative to each other to define a space having dimensions that can be modified, wherein the distance between the lower and upper plates can be modified and/or the length of the lower and upper plates can be modified.

Abstract: Good electric characteristics are obtained even after an antenna being further incorporated into an antenna apparatus including an antenna case having a limited space. An antenna device 31 is formed on an antenna substrate 30 installed upright in an antenna base 20. A flat antenna unit 35 is fastened to the antenna base 20 so that the flat antenna unit 35 is immediately below the antenna device 31. If the wavelength of a center frequency in an operating frequency band of the flat antenna unit 35 is ?, an interval between an upper surface of the flat antenna unit 35 and a lower end of the antenna device 31 is set to about 0.25 ? or more. Accordingly, it becomes possible to make directional characteristics of radiation in a horizontal plane of the flat antenna unit 35 non-directive without being affected by the antenna device 31 and also to achieve good gain characteristics.

Abstract: An antenna apparatus can reduce gaps between laminated plates with a simple structure, and can be produced at low cost and in a small size, while ensuring reliability over a long period of time. The apparatus includes a base having a base transmission line portion, a laminated body that is composed of laminated plates placed on the base and has laminated body transmission line portions in communication with the base transmission line portion, and an antenna main body placed on the laminated body for emitting or receiving electromagnetic waves, wherein the base, the laminated plates and the antenna element plate are coupled with one another through surface to surface contact. The antenna main body has a curved plate formed of an arc-shaped elastic member protruding toward the base in a state before assembly, and the curved plate has an elastic force contributing to the coupling through surface to surface contact.

Abstract: A digital broadcasting antenna structure includes a substrate having at least a first and a second face; a main antenna arranged on the first face; an amplifier arranged on the first face and electrically connected to the main antenna; a compensating unit arranged on the second face and electrically connected to the main antenna; a bandwidth modulating unit arranged on the second face and electrically connected to the compensating unit; and a grounding section arranged on the second face and electrically connected to the bandwidth modulating unit. The digital broadcasting antenna structure can receive digital broadcasting signals without being restricted to any specific receiving direction, and is applicable to low, intermediate and high frequency bands to therefore achieve the effects of miniaturization, high bandwidth and low return loss.

Abstract: An electronic apparatus includes an antenna housing groove extending in an extension direction of one end surface of a housing; and the housing having a boss protruding in the antenna housing groove in a width direction of the antenna housing groove; and a metal plate member that is passed through the boss and is sandwiched between the housing and the antenna body to interact with the bearing member, that is locked in both locked positions of a housed position in which the antenna body is housed in the antenna housing groove and in a protruding position in which the antenna body is rotated from the housed position by a predetermined angle and protrudes from the housing so that the metal plate member holds the positions of the antenna body, and that releases the lock upon reception of a force in a rotational direction of the antenna body.

Abstract: An embedded UWB antenna and a portable device having the same are disclosed. The embedded UWB antenna comprises a grounding element; a T-shaped radiating element having a horizontal portion comprising at least an opening for cutting off undesired frequency and a vertical portion comprising a feed point for feeding current to resonate frequency; and a plurality of sleeve elements extended from the grounding element along two sides of the vertical portion; wherein the plurality of sleeve elements and the vertical portion are substantially parallel to each other.

Abstract: A discharge lamp ballast is provided for powering a discharge lamp with feedback filament heating control. A startup circuit is coupled between output terminals of a DC-AC power converter together with a discharge lamp. A lamp current detection circuit and a lamp voltage detection circuit detect output signals to the lamp. A control circuit controls the switching elements and generates an operating frequency in accordance with a startup operation to generate a high voltage output from the startup circuit and ignite the discharge lamp, a filament heating operation wherein the operating frequency is controlled so as to set the amplitude of the output current detected by the lamp current detection circuit to a target current amplitude based on the amplitude of the output voltage detected by the lamp voltage detection circuit, and a steady-state operation wherein the operating frequency is decreased to maintain a stable light output from the discharge lamp.

Abstract: The present invention relates to a dual polarization broadband antenna having a single pattern, which is provide with a radiation device having a square structure, in which a plurality of folded dipole elements are formed in a single continuously-connected pattern, and a feeding portion for feeding signals to the plurality of folded dipole elements is formed on the radiation device. Accordingly, the plurality of folded dipole elements formed on the radiation device are connected in a single square and rectangular pattern, so that the structure thereof is simplified, with the result that the cost can be reduced. Furthermore, the feeding portion, that dually feeds signals, and the plurality of folded dipole elements, connected in a single pattern, are coupled, so that the dual polarization characteristic can be easily acquired.

Abstract: A coaxial cavity gyrotron with two electron beams includes an electron gun (magnetron injection gun, “MIG,” with two beams), a coaxial beam-wave interaction cavity and an outer magnetic field tube. The coaxial beam-wave interaction cavity consists of two parts: an outer conductor and an inner conductor. The two hollow electron beams produced by the MIG are located between the outer conductor and the inner conductor. The MIG includes inner and outer anodes, with a single cathode located between the anodes. The cathode further includes two emitter rings which produce the two hollow electron beams. The entire gyrotron is immersed in the magnetic field tube such that the magnetic field profile is the same or similar to that for a coaxial gyrotron with one electron beam.

Abstract: Examples of the present invention include antennas and scattering elements having a metamaterial cloak configured so as to reduce effects on the operating parameters of a nearby antenna. For example, an antenna has an antenna frequency, and a cloak is disposed around the antenna having a frequency range in which the cloak is operative. The antenna frequency can lie outside the frequency range of the cloak, whereas the frequency of a second antenna lies within the frequency range of the cloak. In this case, the antenna is cloaked relative to the second antenna.

Abstract: Methods of protecting an electrical device, such as a ballast, from damage due to an inrush current, and devices incorporating such methods, are disclosed. A loss of input power received by the ballast is detected. In response, the ballast is entered into a standby mode. The ballast is able to remain in the standby mode for a standby period of time. The input power is monitored during the standby period of time to measure a start time. Measurement of the start time is triggered by the ballast receiving input power again. The ballast is entered into an active mode when the measured start time exceeds a protection time. The protection time corresponds to an amount of time needed for an inrush current to dissipate following input power again being received by the ballast, protecting the ballast from possible damage due to the inrush current.

Abstract: The present invention discloses an LED driver with direct AC-DC conversion and control function, and a method and integrated circuit therefor. The LED driver comprises: a primary side circuit receiving rectified AC power, the primary side circuit including at least one power switch; a transformer coupled to the primary side circuit and controlled by the at least one power switch to convert a primary voltage to a secondary voltage which is supplied to an LED circuit; and a secondary side circuit coupled to the transformer, the secondary side circuit directly controlling current flowing through the LED circuit and sending a feedback signal to the primary side circuit to control the at least one power switch thereby.

Abstract: A backlight protection circuit includes a driving circuit, two lamps, a pulse modulator, and a feedback circuit. The pulse modulator controlling the operating state of the driving circuit includes an over-voltage sampling end. Each of the two lamps includes a high voltage end connected to the driving circuit, and a low voltage end connected to the over-voltage sampling end through the feedback circuit. The pulse modulator stops the operation of the driving circuit when the voltage of the low voltage end exceeds a reference voltage.

Abstract: A portable electric lamp comprises a lighting module with LEDs and user control means connected to an electronic control circuit to define different lighting modes. An optic sensor is housed in the casing near the light-emitting diode LED to transmit to the control circuit a signal representative of the lighting induced by the lamp to automatically regulate the power of the LED according to a predefined threshold.

Abstract: An electrical connection structure including: a first terminal attached to an edge portion of a circuit board, and composed of a first nipping portion, a connecting portion, a second nipping portion and a leaf spring portion each formed integrally in order as a single member, wherein the connecting portion exists along a side face of the edge portion, the first and second nipping portion and the connecting portion hold the edge portion therebetween and the leaf spring portion extends from an opposite side to the side of the connecting portion of the second nipping portion so that an interior angle formed by the second nipping portion and the leaf spring portion to be an acute; and a second terminal to be electrically connected to the leaf spring portion, wherein the second terminal is pressed to the leaf spring portion into a direction of widening the interior angle.

Abstract: An antenna component (200) with a dielectric substrate and two radiating antenna elements. The elements are located on the upper surface of the substrate and there is a narrow slot (260) between them. The antenna feed conductor (241) is connected to the first antenna element (220), which is connected also to the ground by a short-circuit conductor (261). The second antenna element (230) is parasitic; it is galvanically connected only to the ground. The component is preferably manufactured by a semiconductor technique by growing a metal layer e.g. on a quartz substrate and removing a part of it so that the antenna elements remain. In this case the component further comprises supporting material (212) of the substrate chip. The antenna component is very small-sized because of the high dielectricity of the substrate to be used and mostly because the slot between the antenna elements is narrow. The efficiency of an antenna made by the component is high.

Abstract: A planar antenna device includes a dielectric layer and two conductor layers vertically sandwiching the dielectric layer. The lower conductor layer is used as a ground, and the upper conductor layer forms a radiating element having a structure in which four or more radiating element pieces of different sizes are connected to a feeder line.