Abstract: A microstrap patch antenna with a substantially omni-directional radiation pattern includes an upper hemisphere microstrip patch radiator working against a ground plane and a lower hemisphere microstrip patch radiator working against a ground plane, the ground planes being oriented in close proximity and spaced apart from each other. One of the radiators is excited in left hand circular polarization and the other in right hand circular polarization such that their fields add constructively across their ground planes to achieve an omni-directional radiation pattern.

Abstract: The present invention provides a means of maintaining a constant tuned frequency as a wrist band antenna is lengthened and shortened. As a wrist band antenna is lengthened, the inductance of the antenna is generally increased. The present invention provides a wrist band the length of the antenna. As the wrist band is lengthened the inductance increases and the capacitance decreases thereby maintaining the tuned frequency substantially constant.

Abstract: Antenna mounting apparatus especially for use in connection with satellite dishes comprises a base assembly with an antenna extending upwardly therefrom, multiple ballast means extending radially from the base assembly, outer end plates disposed respectively adjacent the end of the ballast means remote from the base assembly, an aperture formed in each ballast means, and tie rods extending respectively through the apertures and interconnecting the base assembly and the associated outer end plate.

Abstract: A retractable antenna is in the form of a tape (7) which is slidably mounted in a passageway (6). An electrical contact (9) for making connection to the antenna is provided on the rear wall (3) of the passageway. The tape (7) or the passageway (6) or both are shaped so as to form a bend, e.g. a bow, across the width of the tape so that (a) the convex side of the tape confronts the contact (9) and (b) rigidity is imparted to the tape to keep it upright when extended from the passageway. This antenna is slim and lightweight and therefore ideally suited for use with a compact portable radio telephone.

Abstract: A telescopic mast is provided in kit form with stays wound on reels in a predetermined order. This order is such that when erecting the mast it is only necessary to walk between the mast and pegs fixed into the ground and not between two pegs at a distance from the mast. This minimizes the amount of walking which is necessary in erecting the mast. Clamps between sections are formed from a strap around the outer of two concentric sections. The ends of the strap are secured together and attached to a member with a pressure face. A camming device between this member and the mast which acts against the pressure face and the mast enables the strap to be tightened thus gripping the outer mast portion against the inner mast portion. The top section of a telescopic mast is less inherent rigidity than the bottom section and this it is preferable to construct it from material with a greater resistance to longitudinal bending than the lower section and to vary the resistance of the intermediate sections accordingly.

Abstract: Shield apparatus for protecting the covering across the face of a parabolic antenna may include an elongated shield which curves from one end to another and attachment elements by which the shield may be affixed to the antenna to overlie the uppermost periphery of the covering in a spaced relationship therewith.

Abstract: A generally planar antenna formed in strip transmission line comprises a two-dimensional array of antenna elements (11) coupled to a plurality of secondary feeders (10) each coupled at at least one end to a primary feeder (4). In order that the level of coupling between the primary feeder (4) and each secondary feeder (10) should be well-defined and, when there is a large number of elements, suitably low, the coupling means therebetween are shielded and non-conductive, suitably a directional coupler (17). To provide the shielding, the primary feeder (4) and coupling means may be formed in double-ground-plane line. In an arrangement suitable for an antenna wherein power may be supplied to either end of the primary feeder (4) to give radiation patterns having single main lobes with different angular orientations, for example for a Doppler navigation system, one port of each directional coupler (17) may have an open-circuit reflective termination.

Abstract: The present invention provides a distributed antenna system comprising a primary antenna (14A, 16A) and a plurality of secondary antennas (36, 40), a fibre optic network (20, 22) connected between the primary antenna (14A, 16A) and the secondary antennas (36, 40), first means (16, 44) associated with a first one of the antennas (16A, 40) which transmits signals received by that antenna (16A, 40) into the fibre optic network (20, 22), and second means (32, 50) associated with a second one of the antennas (14A, 36) which causes that antenna (14A, 36) to transmit signals received by the second means (32, 50) from the fibre optic network (20, 22).Preferably, the use of a heterodyne circuit is avoided and the light signals travelling within the fibre optic networks (20, 22) are modulated at radio frequency.

Abstract: An antenna for mounting on a non-conductive surface such as a windshield of an automobile coupled by a capacitor incorporating the windshield as the dielectric medium between the two capacitor plates. The protrusion which receives the antenna acts as one capacitor plate and a PCB acts as the inner capacitor plate.

Abstract: A cover for an elongated antenna window of a nose cone of a reentry type missile includes a four directional composite material. A respective portion of a plurality of fibers are disposed in each of the four directions. The directions are oriented so that the fibers provide increased resistance to expected aerodynamic pressure-induced shear forces, especially during reentry, in the plane of the longitudinal axis of the window. The fibers comprise a refractory ceramic such as silica, boron nitride, alumina, aluminum nitride or a combination thereof having a filler material including a refractory ceramic disposed in the interstices between the fibers.

Abstract: A printed circuit cavity-backed crossed-slotted conductive element having two legs of each slot coupled by stripline feeders to a radio communications device. The feeders supply the radio frequency signal with a 180 degree phase shift in order to cancel cross-coupling from one leg to another around the intersection. The conductive element and the stripline feeders are mounted on separate substrates which are attached together with other elements to provide shielding and mechanical protection. The crossed-slot design reduces space and structure required for a mobile application while achieving good performance. When mounted in an array, the crossed slot antennas may be directionally tuned to a specific satellite/frequency/direction via pin diode phase shifters.

Abstract: A slotted waveguide antenna comprises a plurality of radiating waveguide having at least one radiating slot, a feed waveguide for feeding to the radiating waveguides, and coupling apertures arranged between the feed waveguide and the radiating waveguide at a distance of an integral multiple of the guide wavelength of the feed waveguide. The plurality of radiating waveguides are disposed in parallel to form an array in a manner that the radiating slots in the respective radiating waveguides are directed in the same direction. The feed waveguide is in the same plane as the array formed by the radiating waveguides. The transverse width of each radiating waveguide is one half of the distance between the adjacent coupling apertures. The coupling apertures provided on the feed waveguide supply electromagnetic waves having the same amplitude and the same phase to each radiating waveguide.

Abstract: Microstrip antennas disclosed have one or a plurality of radiators arranged in selected arrays wherein a different and preferably lower dielectric layer is provided between the radiator and ground reference than between the feedline and ground reference. Relatively inexpensive and durable dielectric layers of polyethylene having a dielectric constant between 1.05 and 1.5 have been found suitable for between the radiator and ground reference and air for between the feedlines and ground reference. Arrays of four of the radiators disclosed provide for both horizontal and vertical polarization, isolated polarizations and circular polarization of wave energy. The radiators are series-corporate fed and corporate fed.

Abstract: A suspended line feed type planar antenna is arranged with a number of antenna elements formed on a film-shaped substrate, and the film-shaped substrate is sandwiched between a plastic radome and a plastic rear cover, a conductive surface is plated on the rear surface of the plastic radome at its portion except the portions opposing the antenna elements and/or a conductive surface is plated on the whole front surface of the rear cover. The conductive surfaces and the antenna elements constitute resonance type printed path radiators, whereby the planar antenna of the invention can be simplified in construction and reduced in cost, thickness and weight, and the planar antenna of the invention can be increased in productivity and reliability.

Abstract: An antenna system for mobile telephone is arranged on a glass panel, i.e. the rear window glass panel of an automobile. The antenna system comprises a main antenna part comprising a horizontal antenna element, a pair of vertical antenna elements extending vertically from the both ends of the horizontal antenna element, and a first feeding point connected to the free end of one of the vertical antenna elements, an earth line part, provided apart from the main antenna part, which extends in parallel to the horizontal antenna element and which has a second feeding point at an intermediate portion of the earth line part and below the first feeding point, and an auxiliary antenna part which has an extension element extending in parallel to the earth line part and which is connected to either or both of the horizontal antenna element of the main antenna part and the free end of the vertical antenna element connected to the first feeding point.

Abstract: A microwave planar antenna having an antenna body sandwiched between a radome and a rear cover, a plurality of clips for clipping the peripheral portions of the radome and the rear cover at a plurality of different points and then protective trims for covering the clips and the peripheral portion of the radome and the rear cover without using screws. Thus, productivity of assembly parts, such as the rear cover, protective trims and so on can be increased, efficiency in the assembly process can be increased and the waterproof property can be improved. In addition, it becomes possible to avoid having the protective trims become displaced.

Abstract: A radar antenna utilizes groups of high frequency patch radiating element which are configured to function at two frequencies. The groups of patch radiators are configured to have a wide bandwidth and to make efficient use of the aperture while maintaining a thin cross-section.

Abstract: A versatile dual band satellite system includes a main conductive mounting plate member with a central opening of a predetermined size, and a KU band pick-up unit mounted in the plate to face a satellite antenna. A dielectric funnel support is mounted on the side of the mounting plate toward the antenna, and includes a central opening of the same size as that in the mounting plate, for receiving a C-band pick-up unit. The system includes appropriate microwave chokes and microwave impedance-matching structure, to improve the rejection of spurious or off-axis signals, and to maximize signal strength at the input of both the KU band and the C-band units. With the mounting openings in the main mounting member and in the dielectric funnel support being identical, full interchangeability of parts is practical, and an initial installation may include the C-band unit mounted in the mounting plate to face the antenna.

Abstract: Disclosed is a rotating joint used in radars to transmit electrical signals on several channels between a rotating antenna and a fixed support. The pass-band of the matched and coupled circuits of each channel is substantially improved by making these circuits on concentric, circular rings which have metallic ground strips deposited on both faces, said strips being connected by metallized holes, and metallic strips of coils connected by the facing sections of the rings.

Abstract: Antenna apparatus has two laterally spaced waveguide horns with apertures covered by layers of gyrotropic ferrite material. The layers are angled to present opposite angles of incidence to radiation from a common distant source. Electromagnets produce magnetic fields in and parallel with the ferrite layers. The relative phase or amplitude of energy received on the horns is compared to indicate the direction of the source.