Abstract: A feed horn mounted within a streamlined enclosure upon the top surface of a wing of an aircraft at an outwardly-spaced location to direct electromagnetic wave energy toward the face surface of a dielectric slim lens having a metallic reflector between the lens and the fuselage of the aircraft to effect a double-traversal of the incident wave energy. The metallic reflector is planar or parabolic to trim the aerodynamic cross section. When the metal skin of the fuselage is used as the reflector, the dielectric constant of the lens is modified by varying its thickness to produce a very sharp beam by compensating for the curvature of the fuselage at the lens support site.

Abstract: An omnidirectional, broad-band antenna for installation on a vertical mast. The antenna is formed of one or more superposed arrays of elementary antennas in the form of log-periodic alignments of vertical dipoles. Particularly for use in ground stations for ground-air communications.

Abstract: The present invention relates to novel launcher reflectors which are used with reflector antenna systems to compensate for the dominant aberration of astigmatism which was found to be introduced in the signals being radiated and/or received at the off-axis positions. A major portion of such phase error is corrected by using, with each off-axis feedhorn, an astigmatic launcher reflector having a curvature and orientation of its two orthogonal principal planes of curvature which are chosen in accordance with specific relationships, the launcher reflector being fed by a symmetrical feedhorn.

Abstract: A resonant microstrip radiator wherein the size of the radiator is reduced in the resonant or non-resonant dimensions, or both, without reducing the effective resonant dimension or substantially lowering the efficiency of the radiator. Reduction of the resonant dimension is provided by folding the resonant cavity, while reduction of the non-resonant dimension is facilitated by utilization of a low density, low loss dielectric, such that the loss resistance of the element is appreciable with respect to the radiation resistance of the element. Also disclosed are interdigitated antenna structures and provisions for circularly or elliptically polarized radiation.

Abstract: A resonant circularly or elliptically polarized microstrip radiator wherein the size of the radiator is reduced in the resonant or non-resonant dimensions, or both, without reducing the effective resonant dimension or substantially lowering the efficiency of the radiator. Reduction of the resonant dimension is provided by folding the resonant cavity, while reduction of the non-resonant dimension is facilitated by utilization of a low density, low loss dielectric, such that the loss resistance of the element is appreciable with respect to the radiation resistance of the element. The preferred embodiment comprises interdigitated antenna structures.

Abstract: Circularly polarized microstrip antennas consisting of thin electrically ducting, square-shaped radiating elements formed on one surface of a dielectric substrate and having a ground plane on the opposite surface of the substrate. Two feed points are used to provide a circular polarized radiation pattern. The feed points are located along the centerlines of the antenna length and width or along the diagonal lines of the element and the input impedances can be varied by moving the feed points along both centerlines or both diagonal lines from the centerpoint of the element. The antennas can be notched in from the edges of the radiating element along the centerlines of the element width and length, or along opposite diagonal lines of the element, to the optimum input impedance match feed point.

Abstract: A geodesic lens parallel plate waveguide in the shape of a quarter-sphere is used to interconnect a linear array of transmitting/receiving elements and an array of coupling elements. Using this aerial component, scanned radio beams can be generated by a transmitting aerial if the array of coupling elements is commutatively actuated. Unused corners of the geodesic lens parallel plate waveguide may be omitted.

Abstract: An improved capacitor for use in stripline applications which consists of a dielectric material which is plane parallel and has on its two surfaces electrodes forming plates thereof with the width of the dielectric material and the electrodes selected to match the width of the stripline to which the capacitor is to be attached thereby minimizing disturbances and discontinuities in the stripline circuit.

Abstract: A broadband spiral antenna including a tubular member having a planar surface at one end, a planar spiral element supported on the planar surface and radiating outward from a central position on the planar surface to an edge position on the planar surface, and an array of dipole elements supported on and extending around the tubular member and coupled to the planar spiral at the edge position.

Abstract: There is described an improvement for an apparatus employing a plurality of operational elements adapted to cooperate for producing an electrical signal representing the variation of an ordinate quantity with respect to an abscissa quantity changing at a controlled rate. At least one of said elements requires an adjustment during operation such as is capable of causing spurious transients in the electrical signal. The apparatus further comprises a filter for filtering the electrical signal before feeding the signal to a suitable utilization device such as a recorder. The improvement includes control means which operate to interrupt the ordinate quantity signal and cut off the filter response prior to any element adjustment. There is disclosed means for storing the output of the filter at cut off and for memorizing the point along the impulse characteristic of the filter at which cut off takes place.

Abstract: A broadband high pass microwave filter and method of manufacturing thereof hat maximizes the frequency separation between the desired passband of the filter and spurious passbands. A strip of dielectric material has alternately spaced capacitor plates formed on both sides thereof such that parallel plate capacitors are formed at the overlapping sections of the capacitor plates. The dielectric strip is folded in accordian-like fashion and inductive leads are electrically connected to the capacitor plates at each of the folds. The folded dielectric strip is mounted on an MIC substrate, the end plates of the strip are electrically connected to microstrip conductors on the substrate and the inductive leads are connected to the ground plane of the microstrip substrate to thereby form the high pass microwave filter.

Abstract: A low pass filter produced by cable-manufacturing techniques and using a long, distributed capacitance "filter-line" which, when cut into pieces, produces lumped lossy filters. To exhibit appreciable distributed capacitance together with magnetic flux concentration, use is made of special dielectromagnetic materials based on mixtures which synthesize high permittivity, low permeability and high losses.

Abstract: There is described an electronic scanning antenna comprising a multiplicity of elementary radiators arranged for example in a vertical plane and constituting an array designed for simultaneous surveillance and tracking, the array being fed by two parallel waveguides. The first waveguide is connected to the radiators through a set of first couplers in cascade with a set of fixed phase shifters. The second waveguide is connected to the radiators through a set of second couplers in cascade with a set of variable phase shifters and with the first couplers and the fixed phase shifters. The waveguides are connected to respective transmitters and receivers operating at different frequencies. The complete assembly produces simultaneously at least one tracking beam which varies in elevation and one searching beam having a fixed, preferably low elevation angle.

Abstract: An antenna mounting assembly mountable exteriorly of a window and adapted for use with a vertical CB antenna comprises a bracing member adapted to be secured within the frame of the window; a plurality of horizontal angularly oriented ground plane elements; a boom assembly including a supporting member having a mount section, means for securing the supporting member to the bracing member for orienting the supporting member outwardly from the window and means for swivellingly securing the ground plane elements in a radial arrangement to the mount section, the swivelling of the elements defining a horizontal plane; and means for removably securing the vertical CB antenna to the boom assembly substantially at the center of the radially arranged ground plane elements, the securing means orienting the antenna generally perpendicular to the defined plane whereby the swivelling movement of the ground plane elements in the defined plane is used to increase the directional strength of the signal transmitted from the a

Abstract: An L-band radar and antenna array operating with an existing X-band surveance radar to provide a foliage penetration capability. The foliage penetration antenna consists of an array of L-band, stripline dipole/director elements placed in front of an array of broadwall waveguide slots which define an X-band aperture. The X-band aperture in addition to its own function, serves as a reflector for the dipole/director elements. Aperture sharing is thus provided for a dual frequency antenna without increasing the size of the existing X-band aperture.

Abstract: An antenna comprises the combination of a biconical-horn and a circular waveguide. The major symmetry plane of the horn is horizontal and the horn describes a figure of revolution about the major axis of the circular waveguide. Coupled to the one wall of the horn with its axis perpendicular to the horizontal symmetry plane of the horn is the circular waveguide. A TEM coaxial port on the vertical axis of the horn is provided at the vertex of the cone forming the surface of the biconical-horn. Two orthogonal-ports are provided in the circular waveguide with two respective TEM transmission lines extending from within the circular waveguide outside of these ports to provide at their outputs the TE.sub.11 modes.

Abstract: An MOS field-effect device which may be fabricated as part of an integrated circuit having the general characteristics of a lowpass filter. A source and drain region define a long channel (e.g. 500 microns or longer). The cutoff frequency of this lowpass filter which is in the audio range, is controllable by the potential applied to a gate member insulated from the channel.

Abstract: A solid state power combining apparatus for use in a microwave transmission system. The apparatus includes a distributed amplifier having an input transmission line, an output transmission line, and a plurality of amplifiers connected between the input and output transmission lines at quarter wavelength intervals. The phase relationship between the traveling waves placed on the output transmission line from the amplifiers is such that the waves placed on the output transmission line by the amplifiers in the direction toward an output terminal add and the waves placed on the output transmission line by adjacent amplifiers in the direction away from the output terminal cancel each other.Also, a solid state power combining apparatus wherein a plurality of oscillators are connected between input and output transmission lines at quarter wavelength intervals.

Abstract: A line source antenna adapted for a light weight, compact phased array ra and consisting of a plurality of series fed radiating slots periodically located in the narrow side wall of a length of waveguide together with non-reciprocal latching ferrite phase shifters including dielectric loading sections and matching transformer sections on either side of phase shifters located between adjacent slot pairs.

Abstract: An installation for an antenna, particularly advantageous for use in connection with a transceiver in a mobile vehicle, comprising first and second means, each of which includes electrically conductive material, adapted to be fixed, without need for mechanical fasteners, in facing relation and in respective connection with inner and outer surfaces of a portion of a structure capable of providing a dielectric therebetween, the one of said means connecting to said outer surface providing for mount of an antenna in connection with the electrically conductive material thereof which forms one plate of a capacitor, the opposite plate of which is provided by the electrically conductive material of the other of said means which connects to said inner surface, and the said means which connects to said inner surface including means for coupling of the electrically conductive material thereof to conductive means in connection with said transceiver.