Abstract: An assembly of mechanically steerable directional radio antennas, comprising a primary antenna and at least one secondary antenna, arranged such that the or each secondary antenna is capable of being physically steered over a limited azimuthal arc relative to the primary antenna, and is at least partially within the swept volume of the primary antenna. By allowing the swept volumes of the antennas to overlap, a compact assembly can be provided, while by limiting the azimuthal movement of the secondary antennas relative to the primary, it can be arranged that the antennas do not foul each other.

Abstract: An RF antenna comprises a single conductor arranged in a generally spiral triangular form, and means for connecting the conductor to an antenna feed at or adjacent one end of the spiral, the other end of the spiral being open-circuited.

Abstract: An antenna (100) includes at least one antenna radiating element (108, 110) and a dielectric structure (102) defining a cavity containing a fluid dielectric (106). The dielectric structure (102) can be a dielectric circuit board substrate with a ground plane (116) provided opposed to the antenna radiating elements (108, 110). The fluid dielectric (106) is electrically and magnetically coupled to the antenna radiating element. Further, a composition processor (301) is provided for selectively varying a composition of the fluid dielectric (106) so as to dynamically change an electrical characteristic of the antenna radiating element (108) in response to a control signal.

Abstract: An antenna system, particularly for vehicles. A discone-type antenna is preferably utilized for frequencies outside the vehicle. At various frequencies, either or both the antenna and the vehicle serve as exciters.

Abstract: A deployable structure comprising a support and at least one structural element is provided. The structural element is mechanically attached to the support. The latching mechanism assembly is adapted to containing the structural element in a non-deployed state until it is remotely activated or de-latched.

Abstract: Antenna for sending and receiving microwave radiation, e.g. for use in a transponder in a transponder system for wireless payment of tolls, or the like. It has an excited antenna element (13) placed on a dielectric antenna carrier or substratum (11), e.g. on a printed circuit board laminate with a copper covered plastic basis suitable for manufacturing of so-called printed circuits. To increase the performance of the antenna for high production rates with cheap materials, the antenna element is placed such that it gets a directional effect mainly perpendicular to a bearing plane (12) of the substratum (11).

Abstract: An organic LED (OLED) display device and an operating method of driving the same. In an OLED image display device, one switch transistor is provided in one pixel. For at least a part of an OFF period of time of the switch transistor, the OLED is in the non-light emission state, and also the bias of the polarity reverse to that in the light emission is applied to the OLED.

Abstract: A direction of a power feed patch relative to a rod-shaped antenna is set so that a short axis thereof substantially orthogonally crosses a plane containing an intersection between the short axis and a long axis of the power feed patch of a patch antenna and an axis of the rod-shaped antenna. As a plane of polarization of a linearly polarized electromagnetic wave radiated from the rod-shaped antenna is thereby caused to substantially coincide with a direction of the long axis of the power feed patch and to substantially orthogonally cross a direction of the short axis, even if a powerful wave of a higher frequency than a desired frequency to be received by the patch antenna and difficult to be removed by a band pass filter of a low-noise amplifier circuit is radiated from the rod-shaped antenna, field components of the high frequency electromagnetic wave in the direction of the short axis will become virtually zero.

Abstract: Disclosed are systems and methods which provide a tapered conductor strip adapted for broadband wireless communication. Embodiments provide a conductor strip which is curved along its face, thereby providing an aperture taper. The conductor strip configured to provide an aperture taper may be placed over a planar ground plane to form a wideband tapered strip antenna element. Embodiments further provide a conductor strip which is curved along an edge or edges thereof, thereby providing an impedance taper. The dimensions of the impedance taper are preferably selected to provide a desired characteristic impedance with respect to an antenna element formed therefrom. Embodiments may further include a shorting pin or shorting plate configuration to generate an additional mode.

Abstract: The invention relates to a small (0.5 wavelength or less) adaptable antenna system. In particular it relates to the use of loaded parasitic components in the antenna aperture for the purpose of controlling the RF properties of the antenna. Such an antenna system is here referred to as a controlled parasitic antenna (CPA). Parasitic elements within the radiating aperture are terminated by active (controllable) impedance devices. A feedback and control subsystem periodically adjusts the impedance characteristics of these devices based on some observed metric of the received waveform. Such antenna systems can provide multifunctionality within a single aperture and/or mitigate problems associated with the reception of an interfering signal (or signals) or multi-path effects. Such antenna systems are particularly suitable to a situation where an aperture size is desired that is too small for the use of an adaptive phased array.

Abstract: The invention concerns a telecommunications mast installation (10), typically a base station in a cellular telephone network, which includes a mast (14) supporting a telecommunications antenna (16). A foundation structure (12) supports the mast. The foundation structure is in the form of an enclosed chamber (24) situated at least partially underground and defining an internal space which is accessible to personnel and which accommodates electronic equipment associated with operation of the antenna. For aesthetic and security reasons, it is preferred that the chamber (24) be competely underground.

Abstract: A method for designing a multiple layer frequency selective surface structure. An overall response for the structure is specified. The desired response may be modeled as a filter response. Parameters for each of the layers making up the structure that provide the overall response are determined based on the polarization modes between the layers being decoupled. To provide for decoupling, the individual layers are rotated with respect to each other. The overall response of the structure is then calculated and compared to the desired response. Adjustments are made in the parameters of each layer until the calculated response is equal or nearly equal to the desired response.

Abstract: A directional antenna is disclosed that includes an inner conductor positioned within an outer conductor. The directional antenna includes multiple slots around the periphery of the antenna and efficiently dissipates energy received at the slot, and is able to generate a directional azimuth pattern.

Abstract: A phased array antenna includes a plurality of radiating elements, a feed line assembly, a ground plane positioned between the plurality of radiating elements and the feed line assembly, with the ground plane having a plurality of openings positioned between the plurality of radiating elements and the feed line assembly, and a plurality of voltage tunable dielectric phase shifters coupled to the feed line assembly.

Abstract: In an antenna device 10 including a line-shaped or belt-shaped first conductor 11 having an electrically half length of a wave-length of a first resonant frequency, a feed point 12 to which an end of the first conductor is connected, a plate-shaped second conductor 13 on which the feed point is located and on which another end of the first conductor is grounded, an impedance element 14 is loaded halfway on the first conductor and which varies the first resonant frequency, a second resonant frequency, or both the first resonant frequency and the second resonant frequency. Accordingly, a compact antenna device 10 can therefore be constituted so that an impedance matching between the first conductor 11 and the feed point 12 may be readily obtained. In addition, the antenna device 10 can be commonly used with respect to a multi-frequency operation.

Abstract: A high frequency communication device which can reduce undesired electromagnetic coupling inside and outside a box thereof in which circuit parts constituting a transmitter-receiver circuit are contained. Periodic structures (6) are provided on at least a part of a wall constituting a box (1, 4, 5) so that the periodic structures (6) serve as a filter which has a non-propagating frequency band corresponding a frequency band covering an undesired electromagnetic emission inside the box. Thus, undesired electromagnetic emission energy from any electromagnetic emission source can be confined locally to prevent a possible problem of electromagnetic interference.

Abstract: A slot bracket antenna (10) for transmitting or receiving signals is installed to cover an extension slot (9) of an electronic device. The slot bracket antenna includes a bracket (2), a slot (1) defined in the bracket, and a coaxial cable (3) attached to the bracket. The bracket comprises an inner core wire (4) and a metal braiding layer (6). The inner core wire and the metal braiding layer are respectively soldered to two sides of the slot in the bracket.

Abstract: A device for producing laser radiation having a wavelength of about 2 ?m, the device comprising: a solid-state sample capable of producing lasing transitions corresponding to a wavelength of about 2 ?m; and a source of pumping radiation having a wavelength of about 1 ?m, the source being arranged so that at least some of the radiation produced thereby is absorbed by the solid-state sample, causing the solid-state sample to emit radiation having a wavelength of about 2 ?m.

Abstract: A physically small antenna having a wide bandwidth that facilitates the inspection of the attachment to the printed circuit board. The antenna is provided with a dielectric plate having a rear surface, a conductive plate disposed on the rear surface, a vertical element extending in a direction perpendicular to the rear surface. The vertical element includes a dielectric bar, an end of which is attached to the rear surface, and a conductive shell covering a side and an opposite end of the dielectric bar to be attached to the conductive plate.

Abstract: An antenna includes a magnetic interface generator that generates a magnetic interface at a center frequency f0. The magnetic interface generator is a passive array of spirals that are deposited on one layer of a multi-layer substrate. The magnetic interface is generated in a plane at a distance Z above the surface of the substrate layer that it is printed on, where the antenna in printed on a second layer of the multi-layer substrate. The distance Z where the magnetic interface is created is determined by the cell size of the spiral array, where the cell size is based on the spiral arm length and the spacing S between the spirals. The center frequency of the magnetic interface is determined by the average track length DAV of the spirals in the spiral array. The spacing S of the spiral array is chosen to project the magnetic interface to the second layer in the multi-layer substrate so as to improve performance of the antenna that printed on the second layer.