Abstract: An antenna system which has omnidirectional coverage in azimuth and sectoral coverage in elevation. A main reflector including a reflecting surface has polar symmetry about the Z-axis. It also has a cross section in any plane containing the Z-axis which satisfies the laws of power conservation and reflection. It is determined by the desired far-field pattern and the microwave feed pattern (for example TM.sub.01) employed. Single or dual reflector systems are described. Using the system on "receive" with multiple "feeds", full azimuthal direction finding of incident radiation can be achieved.

Abstract: Satellite tracking system for use between a ground mount and a satellite dish antenna and including the main components of a gear drive, a worm gear driven by a gear motor, and a coupling shaft connected between the gear and brackets supporting the antenna. The worm gear drive includes a potentiometer connected thereto providing a controller signal input. Limit switches can be provided for limiting the rotation of the antenna between prescribed limits. The worm gear drive provides direct shaft drive for accurate rotation through wide angles.

Abstract: A radio frequency antenna is provided comprising: a waveguide section; first means for establishing radio frequency energy in such waveguide section having a first linear polarization with an electric field disposed normal to opposing wide walls of the waveguide section; a planar microwave circuit means, for establishing a second linear polarization having an electric field disposed perpendicular to the electric field of the first linear polarization, such microwave circuit means being disposed within the waveguide between the wide walls and relative to the feed means to provide the first linear polarization and the second linear polarization with substantially coincident phase centers. In a preferred embodiment of the invention, the microwave circuit means includes a strip conductor feed separated from a ground plane conductor by a dielectric, such ground plane conductor having a notch formed therein and fed by the strip conductor.

Abstract: A radiating antenna system (30) comprises a plurality of vertically erect secondary antennae (34) disposed in a pattern about a vertically erect primary antenna (32). An electrically conductive screen (36) which surrounds the pattern of secondary antennae (34) includes partially-buried, partially exposed electrical conductors (54) which have exposed ends (54b) thereof electrically connected to one or more above-ground, loop-forming cables (52). A series of open-ended transmission lines 70 are suspended in an essentially horizontal plane above the ground with each of the transmission lines (70) being electrically connected to a top of an associated secondary antenna (34). The secondary antennae (34) are excited in a manner whereby radiation therefrom essentially cancels sky waves radiated by the primary antenna (32).

Abstract: The invention comprises a solid material that is an electrical conductor in a single direction which comprises an amorphous glass matrix containing a plurality of microscopically thin metal filaments, all of which are oriented in the direction of conductivity and extend to or near the surfaces of the solid material. This directionally conducting material is produced by subjecting a metastable glass supersaturated with metal to directed ionic radiation. On irradiation parallel microscopic holes or pores are formed which become filled with molten metal during tempering, which cool to form metallic dipole filaments. The thickness of the material and the angle of irradiation may be selected to produce dipole filaments of lengths appropriate to act as antennas for electromagnetic radiation of wavelengths from less than about 0.1 micron to about 1 mm. The direction of conductivity, i.e.

Abstract: A method and apparatus are provided for transmitting a microwave signal as a beam having a wavelength small as compared to the size of the reflecting surfaces, wherein a main reflector is stationary with respect to a sub-reflector and the main reflector is motional with respect to the feed. The invention comprises rotating the sub-reflector about a first rotational axis transverse and preferably orthogonal to the guide axis, the first rotational axis being on the vertex of a secondary reflector, thereby directing radiation from a fixed feed to the motional sub-reflector. The primary reflector and sub-reflector are disposed relative to one another to share a common focus or confocal point.

Abstract: A broadband cup antenna comprises dipole means having at least one pair of short spiral type monopoles diametrically disposed in a common plane in proximity to the open end of the cup. Parasitic elements are in juxtaposition with the monopoles and are electrically connected by a conductive ring mounted about coaxial lines. A circumferential slot formed in the outer conductor of the coaxial line adjacent to the monopoles serves for excitation of the monopole elements to effectuate signal transmission.

Abstract: A wide-band microwave antenna capable of radiating over a wide angular field is fed by a rectangular wave guide and includes a first sectoral horn coupled to the rectangular wave guide. The first sectoral horn is sectoral in the H plane. Coupled to the first sectoral horn is a second sectoral horn which is sectoral in the E plane. The second sectoral horn has a partial-cylindrical-shape with circular-shaped outer edges. The second sectoral horn has a top plate and a bottom plate. A plurality of equally spaced power distributors are radially disposed in the second sectoral horn and extend from the top plate to the bottom plate through the entire length of the second sectoral horn. These power distributors thus form a plurality of elementary radiation sources.

Abstract: A combination of two juxtaposed rhombic antennas and a V-antenna on a single, longitudinal, non-conductive support boom. The two rhombic antennas lie flat upon one another in substantially the same plane and are supported on the boom with insulating transverse spreader rods.

Abstract: An antenna having two crossed cylindro-parabolic reflectors in which the generatrices of said reflectors are orthogonal. The source is placed close to the center of the main reflector, which is further provided with polarization rotation means. The auxiliary reflector is placed facing the main reflector and it is such that it is transparent to a wave polarized linearly in one direction and reflecting to the waves polarized in an orthogonal direction.

Abstract: A microwave polarization converter for converting circular polarization to linear polarization or vice versa. The converter includes a fin and a shorting plate to effect such conversion.

Abstract: A satellite antenna particularly adapted for use on a recreational vehicle such as a house trailer or mobile home, having a roof surface, the antenna including a base plate mounted on the vehicle roof surface, a support plate rotatably secured to the base plate and rotatable about a generally vertical axis for at least about 360 degrees, a parabolic satellite signal reflector having a focal axis, the reflector being pivotally secured to the support member, a variable length member, such as a screw type cylinder for selectively pivoting the parabolic reflector relative to the support member, and a feed arm pivotally secured to one end to the parabolic reflector, a signal receiving feed horn mounted on the other end of the feed arm, the feed arm being pivotal to a position wherein the feed horn is coincident with the focus apex of the reflector and to a rest position in which the feed horn is retained within the confines of the reflector interior surface and linkage means to automatically pivot the feed arm to

Abstract: The invention pertains to an extendable directionally adjusted dipole antenna particularly suitable for use with recreational vehicles. The antenna includes a vertical column having an extendable dipole arrangement at its upper end utilizing flexible actuators associated with a pair of reels whereby the actuators and associated telescoping antenna assemblies are simultaneously extended and retracted. An operating shaft for rotating the reels extends through the column and either manual or electric means rotate the shaft. The column is rotatable for directional adjustment, and under manual control the shaft extends through the vehicle roof permitting interior adjustments.

Abstract: The present invention relates to an improved mount for parabolic antenna and in particular to one comprising a base, a swivel table rotatably mounted on the base, a gear box fastened on the swivel table, a driving rod having at one end a worm disposed in the gear box, a driven rod having at one end a worm gear engaged with the worm of the driving rod and at the middle portion a worm protruding from the gear box, a main worm gear meshing with the worm of the driven rod, a pad disposed between the main worm gear and the swivel table, and a supporting frame fixed on the main worm gear.

Abstract: A vandalism-resistant antenna for the UHF band comprises a ring-shaped radiator printed on a dielectric board or disc mounted within a shallow enclosure of insulating material having high impact strength. The radiator is approximately 1/4 wavelength long at the operating frequency and is located at a constant spacing above a ground plane. A coaxial RF connector fastens the radiator-board assembly to a mounting surface serving as the ground plane, and couples the antenna to a transmitter or receiver.

Abstract: Doppler radar apparatus for use in a velocity measuring system for farm tractors and the like. The apparatus includes a dual mode conical horn having a flare angle substantially in excess of 12.5.degree., and a dielectric lens formed of a glass filled polymer. The doppler output signal provided by the RF transceiver associated with the dual mode horn is high pass filtered to remove low frequency signals therefrom. The horn is mounted in such a way that it is isolated from mechanical vibrations which would induce doppler signal frequencies in excess of the cutoff frequency of the high pass filter. Moreover, the horn assembly (which is aluminum) and a steel housing assembly are coupled together in such a way that thermal expansion and contraction will not loosen the friction fit between the two assemblies. The two assemblies are held together by a single, large diameter annular locking ring.

Abstract: An extensible rod antenna system for vehicles including an extensible rod antenna element formed of conductive rods, an upper fitting member and a lower cylindrical fitting member clamping and holding the rod antenna to a fitting hole located on the vehicle wall, a drainage outlet provided on the side wall of the lower fitting member, and a drainage pipe connected to the drainage outlet which discharges outside of the vehicle. This extensible rod antenna system is improved in that it drains water leaking through the space between the extensible rod antenna element and the upper portion fitting member.

Abstract: A microstrip antenna system is comprised of either a single antenna element (patch) or a plurality of stacked antenna elements having one or more feedpins connected to a corresponding number of conductive elements (flags) capacitively coupled to the antenna element or elements. The one or more feedpins have an inductive reactance which is cancelled by trimmed flags to provide the capacitance necessary to cancel the inductance for tuning the one or more antennas and providing maximum gain and minimum VSWR.

Abstract: An antenna element including microstrip having a microstrip feed line and ground plane on opposite sides of a substrate, a resonator on the same side of the substrate as the microstrip feed line, and a dipole insulated from the feed line and from the resonator.

Abstract: A passive, integrating electromagnetic radiation power dosimeter. A radiofrequency or microwave antenna is combined with a diode detector/rectifier, a squaring circuit, and a electrochemical storage cell to provide an apparatus for determining the average energy of electromagnetic radiation incident on a surface. After a particular period of irradiation, the dosimeter can be interrogated electrically or visually, depending on the type of electrochemical cell employed, to yield the desired information. The apparatus has a substantially linear response to the electromagnetic power density over a wide range of electromagnetic field, and all of the energy required to record the incident energy is supplied by the electromagnetic field.