Abstract: An antenna having a rotatable phase center is disclosed. The antenna includes a horn antenna having a phase center and at least one rod-like impedance element located adjacent a wall of the horn antenna near the phase center. The length of the impedance element is selected such that it shifts the phase center from its normal, undisturbed location without substantially affecting the amplitude pattern of the antenna. Means is provided for mechanically rotating the rod-like impedance element around the phase center so as to thereby cause the phase center to also rotate.

Abstract: A high gain vertically polarized antenna section includes a hollow conductive central cylinder which is used to encase feed lines and power dividers used for feeding the antenna section. The cylinder is surrounded by an array of symmetrically disposed vertical radiating elements arranged in a plurality of symmetrical columns. A plurality of ring transmission lines or shorted quarter-wave stubs are utilized to distribute electrical energy to each of the vertical radiators in a manner such that the instantenous current flow is in the same direction in all of the vertical radiating elements. Any horizontal currents in the ring transmission lines or shorted quarter-wave is substantially cancelled by out-of-phase horizontal currents.

Abstract: Metallized, particularly nickel-coated, knitted net fabrics are suitable for protecting the eyes against microwave radiation with very little adverse effect upon the field of vision, particularly when the mesh width of the knitted net fabrics amounts to <0.25 .lambda., preferably <0.1 .lambda., .lambda. being the wavelength of the radiation to be screened off at the upper frequency limit.

Abstract: A device for exciting a corrugated ultra-high frequency source of revolution operating in two remote frequency bands, decoupled mechanically from the source. The device includes two excitation devices corresponding to the two operating bands, placed perpendicularly to each other, at respective distances from the mouth of the source such that the waves which they emit remain canalized in the Rayleigh zone of each device and provide optimum coupling between these device and the source.

Abstract: An electromagnetic wave radiator is provided formed by a radiating element and its supply device, both formed from a dielectric plate with median longitudinal axis, metalized on one face along two parallel strips of total width d.sub.2, wherein the supply device is formed by a slot-line placed inside a metal parallelepipedic case. The radiating element may be of the dipole type. Such a wave radiator may be used as an elementary source for an electronic sweep network antenna.

Abstract: A directionally sensitive receiving antenna, particularly for microwave radiation, utilizes the change in impedance, as a function of the angle between the energy vector of incident radiation on a gyrotropic medium, e.g. a ferrite material, and a magnetic field passing through the medium, enabling a highly directional antenna of small physical dimensions to be constructed.

Abstract: A method and apparatus for broadcasting, transferring and disbursing infotion from space to earth uses sunlight as the carrier. An orbiting platform receives sunlight and modulates it with electromagnetic signals carrying the information beamed up from an earth station, communications satellite or aircraft. The modulated sunlight is directed to a designated area on earth from the orbiting platform where it penetrates clouds as well as seawater to reach surface and submerged receiving stations including submarines.

Abstract: A horn antenna construction, particularly for use in microwave radar detector circuits, comprises a molded horn element that is open at its bottom side, with a ridge molded into its flared top surface, and being electrically conductive at least at microwave frequencies such as in the X-band and K-band. The open bottom of the horn element mates to a conductive upper surface on a mounting board, and the horn is drawn down onto the mounting board so that its upper surface forms the bottom of the horn. Thus, the ridge is brought into physical and electrical contact with a feed strip formed in a microstrip board on the mounting board, that has a mixing diode or diodes associated therewith. By this construction, there is a positive and dimensionally stable association of the throat of the horn and the ridge to the feed strip and the mixing diode(s), without the necessity of any solder, inserted connectors or mounting pins, or the provision of any tuning posts or screws.

Abstract: A dual band antenna for a radio transceiver includes an inductively loaded conductor of a predetermined length with feedpoint located substantially central of the conductor. Radiator elements terminate the ends of the conductor and a ground plane terminates the radiator elements. An adjustable balanced impedance matching circuit is coupled to the feedpoint. Dual banding elements couple to the impedance matching circuit with a high Q, parallel resonant circuit element. Input and output circuits are also coupled to the dual banding elements. The design minimizes the effect on the antenna operation by the proximity of the user's hands and head since the high impedance portion of the antenna is confined to the center thereof.

Abstract: A bootlace microwave lens antenna has orthogonal delay lines for reducing adratic phase errors to improve focusing capability. The collector and radiator elements consist of mutually orthogonal pairs of subelements with one of the subelements oriented radially and the other oriented tangentially on the respective collector and radiator surfaces. Individual delay lines interconnect corresponding radial and tangential subelements on each surface thus allowing for phase corrections in the axial planes parallel to and perpendicular to the plane of scan by the introduction of an appropriate phase delay in each delay line.

Abstract: An antenna matching device has a ferromagnetic core with a balanced shape and composition to each side of a center tap position. Each side of the core has a first and second parallel wound coil, the free end leads of the first coils being connected together, and the center-tap lead of each first coil being connected to that of the corresponding second coil on the opposite side of the core, the free end lead of each second coil being connected to its own antenna terminal.

Abstract: A microwave device in which resonance at a first microwave frequency is determined by the dimensions of a discontinuity defined by conductive material, such as slot antennas, cavity-backed antennas and transmission line stubs. In one aspect of the invention, the thickness of the conductive material in a bounded portion of the conductive material adjacent the discontinuity is equal to the skin depth of the conductive material at the first microwave frequency to thereby effectively redimension the discontinuity at a lower second microwave frequency to cause the device to also be resonant at the second frequency.

Abstract: An RF transparent antenna shield structure is disclosed particularly useful for missile nose cone radome and other severe environment applications. The structure comprises a solid metal wall member perforated to form a triangular grid array of windows each of which has fitted within it a dielectric plug member the end faces of which are flush with the opposite surfaces of the metal wall member. The thickness of the wall member and the dielectric constant of these plug members are chosen such as provide a resonant radome thickness. The waveguide-space junction susceptances are tuned out by capacitive iris members concentrically disposed on the plug member end faces, to yield acceptable uniformity of insertion phase and attenuation even at relatively extreme incidence angles.

Abstract: A receiving antenna for use in proximity to an antenna having a circular radiating magnetic field includes at least one antenna having a null spatial sensitivity pattern along at least one axis, oriented with the circular radiating antenna located in said null pattern. In a preferred embodiment, the antenna having spatial sensitivity is three orthogonally oriented loop antennas, arranged to be insensitive to signals from the circular radiating antenna and sensitive to TE and TM signals from a remote location.

Abstract: An antenna apparatus has a first wire-like antenna element formed into a rectangular planar loop and a second antenna element which comprises two L-shaped plates electrically connected to the loop and mounted to a rectangular planar base member. The loop is hinged to the planar base member along long sides of the respective rectangles so that the angle between the planes of the loop and base member is adjustable. The base member pivots about an axis on a mount which can be secured to a television receiver.

Abstract: The invention relates to a directive broad band antenna element of V-shaped dipole type with bent wire- or strip-shaped dipole antenna (A). The dipole antenna is divided into two sections, a first section (S1) where the radiation is minimized (or prevented) by a small distance between the conductors and a reduced phase velocity, and a second section (S2), where the radiation is enhanced by increasing the phase velocity by means of introduced series capacitances (C1, C2, . . . Cn). The series capacitances have respective values which depend on the local angle between the dipole conductors and a radiation axis (x), and are chosen such that the phase velocity is increased to a value which effects radiation contributions from different parts of the conductors to cooperate in the desired radiation direction.

Abstract: A satellite dish antenna having parabolic-shaped support ribs firmly engaging the sides of adjacent screen-mesh reflected petals along the entire longitudinal length of each petal. Each support rib having an upper reflective surface lying in the same plane as the surface of the reflective petal, under which is located a locking arrangement which engages adjacent reflective petals the entire length of the petal.

Abstract: A mechanical vibration-tolerant whip antenna having, in combination, a multi-section conical metal tube having successive sections each joined by an internal rigid rod tightly fitting within a corresponding recess in the respective ends of each of the adjacent sections to be joined with the outer metal surfaces of the successive sections providing a continuous smooth external metal surface transition, and each rigid rod extending sufficiently above and below a node of mechanical vibration resonance to provide a rigid support to the node. Additional vibration-tolerance is achieved by vibration damper inserts disposed within the tube near each node of resonance to damp vibration of the tube.

Abstract: A beam-steering feed network for use with linear and planar phased-array enna systems which includes a phase divider system for producing a plurality of incrementally phased IF signals. The phase divider system includes a plurality of coupled amplifier phase divider modules coupled together to form a network. The network is coupled to receive at least two boundary signals having different phase angles. The phase angle difference between the boundary signals is divided by the phase divider modules in the network. Each module produces an output signal having a phase angle differing from that of the output signals of the immediately adjacent modules in the network by a phase angle gradient. The system thus divides the phase angle difference between the boundary signals into a plurality of incrementally phased output signals.

Abstract: A singly fed circularly polarized microstrip antenna has a dielectric substrate having a ground layer coated on one side thereof and a metallic patch radiator coated on the other side thereof. The radiator takes any arbitrary configuration and excites circularly polarized waves at two frequencies. The feed point is located on the loci, determined by the exciting frequency and the circularly polarized wave rotation direction.