Abstract: A multimode antenna structure is provided for transmitting and receiving electromagnetic signals in a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports.

Abstract: An antenna system operative with a communications device for receiving a radio frequency signal, wherein the communications device produces a first control signal representing a frequency of a received signal. The antenna system comprises an antenna structure for receiving the radio frequency signal, the antenna structure comprising tunable elements for controlling a resonant frequency of the antenna structure; a decoder responsive to the first control signal for producing a second control signal and a switch matrix responsive to the second control signal for configuring one or more of the tunable elements to control the resonant frequency responsive to the frequency of the received signal.

Abstract: One embodiment of the invention relates to an antenna providing a tunable resonant frequency within a low frequency band and further providing a high resonant frequency, the antenna comprises a first radiating structure of a first effective electrical length, a second radiating structure of a second effective electrical length having a fractional integer relationship to a wavelength related to the high resonant frequency and a variable reactance element connecting the first and the second radiating structures, wherein varying a reactance of the variable reactance element tunes the antenna within the low frequency band.

Abstract: A sound reproducing device. The sound reproducing device for receiving a frequency-hopping signal having an instantaneous frequency within a hopping bandwidth. The sound reproducing device comprises a first antenna having a bandwidth including the hopping bandwidth for producing a first received signal and a second antenna tunable to frequencies within the hopping bandwidth responsive to an instantaneous hopping frequency. The second antenna produces a second received signal. The device further comprises a module for processing one or both of the first and second received signals to produce a signal for driving the sound reproducing device.

Abstract: One or more embodiments are directed to a multimode antenna structure for transmitting and receiving electromagnetic signals in a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure is configured for optimal operation in a given frequency range. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry, and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports. Each of the plurality of antenna elements is configured to have an electrical length selected to provide optimal operation within the given frequency range. The antenna structure also includes one or more connecting elements electrically connecting the antenna elements such that electrical currents on one antenna element flow to a connected neighboring antenna element and generally bypass the antenna port coupled to the neighboring antenna element.

Abstract: A multimode antenna structure is provided for transmitting and receiving electromagnetic signals in a communications device. The communications device includes circuitry for processing signals communicated to and from the antenna structure. The antenna structure includes a plurality of antenna ports operatively coupled to the circuitry and a plurality of antenna elements, each operatively coupled to a different one of the antenna ports.

Abstract: An optical transceiver antenna has a pair of cartridges supported by a pan/tilt mount. A lens at forward end of a cartridge interfaces light between an end of a light relay element retained by an axial deflection device and free space. The forward end of a cartridge also terminates first ends of actuator wires that are mutually rotationally displaced a distance of 90° from one another in a plane normal to a boresight axis of the antenna. The actuator wires have second wire terminations at the axial deflection device which are mutually rotationally displaced a distance of 90° from one another in a plane passing through the axial deflection device normal to the boresight axis. Heating currents are supplied to the actuator wires, causing their lengths to change, thereby flexing the axial deflection device and light relay element off boresight.

Abstract: An monolithic surface mountable antenna. The antenna comprises a ground plane, two dielectric layers separated by a conductive intermediate layer and a plurality of conductive regions on a top surface. Ground vias pass through the dielectric layers and connect one or more of the conductive regions to the ground plane. At least one signal via is connected to one of the plurality of conductive regions.

Abstract: An monolithic surface mountable antenna. The antenna comprises a ground plane, two dielectric layers separated by a conductive intermediate layer and a plurality of conductive regions on a top surface. Ground vias pass through the dielectric layers and connect one or more of the conductive regions to the ground plane. At least one signal via is connected to one of the plurality of conductive regions.

Abstract: Pixel clock and beam scan timing of an acousto-optic scanner are controlled by an acoustic velocity-driven, phase locked loop containing an adjustable voltage controlled pixel clock generator, which is controlled by a detector that produces delayed and attenuated replica of the excitation waveform applied to an ATWL scanner used to scan a light beam across a workpiece. In a first embodiment of the invention, an end-of-cell transducer converts the pressure induced traveling lens into an electrical signal replica of the excitation input. In a second embodiment, an end-of-scan optical pick-off monitor is employed to detect the scanned optical spot as it crosses its field of view.

Abstract: An acoustic impedance-matching transformer includes a tapered acoustic energy transmission (metal) block, having an acoustic impedance less than that of a piezo-electric transducer in a metric direction toward that of the acoustic propagation medium of the waveguide, and by an amount that allows tailoring of the relative spatial dimensions of mating surfaces of the transducer and the block, so as to provide efficient broadband coupling of acoustic energy. The surface area of the end face of the block engaging the transducer is a corresponding fraction of the area of the transducer. The tapered block focuses acoustic energy toward the input aperture of the waveguide channel. The taper is determined in accordance with difference between the acoustic impedance of the aluminum block and that of a second acoustic wave propagation element, such as a quarter-wave section of plexiglass, interposed between the waveguide channel and the tapered block.