Abstract: An antenna assembly for use on a vehicle includes telescoping radiating sections that collapse toward an insulated mounting base, so that the radiating sections can be selectively extended. An impedance matching network with concentric outer and inner conductive tubular members slidably receives the telescopically collapsed radiating sections. Both tubular members are attached to the mounting base and electrically insulated therefrom and from each other. The inner tubular member is electrically connected to the radiating sections at a base end thereof. The outer tubular member has at least one longitudinal slot therein through which the central conductor of a transmission line is connected to the inner member. A ground contact is electrically connected to the outer tubular member. A slidable terminal that is selectively adjustable longitudinally along the outer tubular member is connected to the transmission line to select a signal insertion point.

Abstract: The invention is a compact wave antenna system for use on an aircraft. The antenna is mounted on a boom made of a dielectric material extending from the rear of the aircraft. The antenna comprises a thin, flat conductor wrapped around the boom. A large, "capacitive hat" is mounted to the extreme rear end of the conductor. The main contributors to the performance is the use of thin, wide conductor design and its relatively long length. The width causes high shunt capacity and high RF current flow to the airframe from all sections of the compact wave conductor topped off the capacitive hat at the end. The thin conductor cross-section minimizes series inductance and improves the flow of RF current. Additional current flows due to the spiral section coupling to sympathetic polarities of the airframe and due to additional radiation from the directional discontinuities.

Abstract: A frequency independent constant beamwidth lens antenna concept is descri utilizing a point source to point focus nonspherical lens. The essential feature is that a twisted planar or hyperbolic paraboloidal phase or wave front is formed by the antenna which then in turn produces a frequency indepenent constant beamwidth beam in the far field of the antenna for radiation or reception of planar or nearly planar spherical waves. Moreover, the frequency independent constant beamwidth beam may be steered or scanned in azimuth without moving the lens antenna or a plurality of fixed beams in different directions may be formed simultaneously by the lens antenna.

Abstract: An electric wave operating device for efficiently coupling electromagnetic energy from a waveguide into a dielectric element or vice versa. A waveguide horn portion is chosen for radiating in the primary HE.sub.11 mode and designed to have a predetermined HE.sub.11 mode farfield radiation pattern. A dielectric member is securely disposed with one end in the plane of the aperture of the waveguide horn with the dielectric member having a predetermined HE.sub.11 mode farfield radiation pattern substantially equal to the farfield radiation pattern of the horn.

Abstract: A receiving device for detecting the presence of an indicating device in a restricted investigation zone, where coils and associated feed and receiving equipment are provided to emit and receive magnetic alternating fields in order thereby to detect the presence of an indicating device in the investigation zone, which indicating device is capable to receive alternating fields and to re-emit an alternating field. Said receiving coils for receiving said re-emitted alternating field comprise at least two coil sets (10,10',10"), each of which constitutes a so-called balanced coil wound to a configuration corresponding to two substantially rectangular eights located to the side of each other in the same plane.

Abstract: The subject invention relates to an antenna having broadband characteristics. The antenna is a dual notch device capable of receiving or transmitting electromagnetic waves comprising a substrate, an upper planer conducting antenna element disposed on one side of the surface of said substrate and having a first curved edge, a second conducting antenna element disposed on the other side of said substrate and having a second curved edge, said first and second curved edges being closely related to one another and spaced apart in close proximity at one point to define a feed-point therebetween with adjacent curved edges gradually tapering outwardly therefrom to define flared notches interfacing one another and interconnected by said gap.

Abstract: A dish for receiving satellite signals mounted on a stand through a casing which has a shaft projecting through the casing, the shaft having ends connected to the dish through bracket structure. Within the casing is a worm wheel mounted on the shaft. Also within the casing is a pivoted rocker plate mounting a worm gear and motor. The worm gear engages the worm wheel, and biasing means urges the rocker plate in a direction causing snug engagement of the worm gear and worm wheel. Shaft rotations are determined by electronic means.

Abstract: A slotted waveguide antenna assembly includes a slotted waveguide, a dielectric beam shaper and reflectors which are fixed and held by a holder member.The dielectric beam shaper is formed from a pair of dielectric plate members. The dielectric plate members are so arranged that they are slightly closer at the forward ends than the base ends, thus providing a nonparallel arrangement. The inclination of the dielectric plate members is selected within a range of 0.8.ltoreq.d/D<1 (D: a distance between the dielectric plate members at the base portions, d: a distance between the dielectric plate members at the forward portions).The dielectric plate members have a thickness which produces a phase difference, between electromagnetic waves reflected by inner surfaces of the respectivie dielectric plate members that are opposite each other.

Abstract: A method of sectioning an antennae reflector without distorting the shape of the reflector surface. The reflector is supported in a substantially relaxed state so that only its internal residual stresses determine its shape. A plurality of beam pairs are attached to the outer surface of the reflector and are used to mark the corresponding curves along which the reflector is to be sectioned. When the cut lines have been marked so as to be visible on the inner surface of the reflector, the reflector is then cut along the cut lines marked on the inner surface thereof to section the antennae for transport and storage.

Abstract: A composite coupling aperture for coupling energy between two waveguides having a thickness dimension t perpendicular to the aperture-plane characterized by a non-uniform cross-section along the thickness dimension.

Abstract: The device according to the invention exhibits a TEM waveguide (1), which opens out in a pyramid shape and which is closed by a wall (7) of high-frequency peak absorbers (7.1) and which exhibits an asymmetrically disposed, plate-shaped inner line (6), which is connected to a plurality of terminal resistors (8.1, 8.2, 8.3) through the absorber wall (7). The TEM waveguide (1) further exhibits a closed outer line (5). The absorber wall (7) is curved in the manner of a spherical segment, the center of curvature being situated in the region of the tip (2) of the pyramid-shaped TEM waveguide (1).

Abstract: A three resonator capacitively coupled microstrip antenna structure includes an inverted stacked array of elements with a lowermost driven element directly connected to a transmission line connector, and passive elements stacked above the driven element and separated from the driven element and from one another by dielectric layers. The dimensions, spacings and quality factors of the elements are chosen so that at least one, and possibly two elements are resonant at any given frequency within a desired frequency operating range. The resulting antenna structure offers very broad bandwidth at relatively low VSWR in a compact, rugged package. The manner in which parameters of the stacked antenna structure are specified to achieve desired VSWR bandwidth and radiation efficiency is also described.

Abstract: The feedline connection to a microstrip antenna patch is designed to integrally include a predetermined capacitance for broadbanded operation. RLC parameters of a parallel circuit model for a specific radiator for a given feedpoint location are measured or otherwise determined. A series LC feed network is then employed and predetermined series LC parameters are chosen so as to optimize the desired bandwidth for the resulting two-stage band pass filter network. The resulting broadbanded microstrip antenna system, network may provide an operating bandwidth on the order of 30% (with less than 2:1 VSWR).

Abstract: A compact, easy to manufacture quarter-wavelength microstrip element especially suited for use as a mobile radio antenna has performance which is equal to or better than conventional quarter wavelength whip-type mobile radio antennas. The antenna is not visible to a passerby observer when installed, since it is literally part of the vehicle. The microstrip radiating element is conformal to a passenger vehicle, and may, for example, be mounted under a plastic roof between the roof and the headliner.

Abstract: A close-packed divergent array of cavity-backed antennas for use in the radome of a missile. Each antenna cavity is tapered from its radiating face towards its base so that the antennas can be mounted more closely together while their radiating faces maintain conformity with the streamlined surface. The array can thus be moved farther into the apex of the radome with a consequent reduction of the antenna divergence angle and greater sensitivity in the boresight region.

Abstract: Multi-element microwave plane antenna for receiving satellite television signals with two simultaneous polarizations. The antenna is provided with two systems of lines (1) whose ends (3, 30) form probes emerging into wave-guides (2). The probes of one system (3) are perpendicular to those of the other system (30). Between the two systems of lines there is placed only a thin sheet (150) bored with cross-shaped cut-outs (6), and provided with separating studs made from a silk-screen-printed insulating material.

Abstract: The invention comprises a switching mechanism for a micro wave signal dish receiver apparatus. The mechanism has means for switching a wave guide of a 12 GHZ frequency signal into and out of concentric alignment with the center of a 4 GHZ wave guide of the apparatus. The 12 GHZ wave guide when switched out of alignment is retracted so as not to interfere with the 4 GHZ wave guide while the 4 GHZ wave guide is made operative to receive a signal of that frequency. The mechanism can project the 12 GHZ guide into the center of the 4 GHZ wave guide to receive a signal of a 12 GHZ frequency at the same focal point substantially as the focal point of the 4 GHZ, without the 4 GHZ wave guide interfering with the 12 GHZ wave guide operation.

Abstract: A noise attenuating antenna system for AM-FM recreational receivers having a single RF input for use on nonmetallic marine vessels or any other vehicle where electric noise presents a problem. The antenna system has at least a shielded loop antenna for receiving radio signals in the AM frequency band and a dipole antenna for receiving radio signals in the FM frequency band. An impedance matching and signal routing circuit passes the signals received by the shielded loop antenna and the dipole antenna to the recreational receiver. An amplifier, whose operation is controlled by a remotely located selection switch, passes the RF signals received by the loop antenna to the impedance matching and signal routing circuit and a signal attenuating circuit passes to ground the RF signals recevied by the dipole antenna when the selection switch is in an AM position.

Abstract: Converter apparatus for interconnecting a universal replacement power antenna to the original equipment components of a vehicle radio system or the like, and for automatically steering the electrical control signals to maintain the proper up-down operating function. The connector apparatus comprises an electronic converter module, a group of wire terminal connectors and a connector block, the latter consisting of a three lead, polarized female connector, compatible with an existing connector in the vehicle system. A pair of diodes are used in the electronic converter module to automatically steer control signals among three interconnecting wires between the original equipment antenna relay and the replacement antenna relay.

Abstract: An omnidirectional antenna comprises a ring-shaped subreflector surrounding an omnidirectional feed and a ring-shaped main reflector for redirecting radiation from the subsidiary reflector to the target zone. The feed has a focal ring and a hollow centre to accommodate supports, feeders etc which facilitates stacking of antennas.