Abstract: The plate-type antenna is constituted by two tangent circular rings lying in a common plane and interconnected by a slit which is narrow and oriented in the direction of an axis which joins the centers of the rings. The slit extends from the internal edge or circumference of one ring to the internal edge or circumference of the other ring. The tangency zone has a given width which is small as possible in the direction which is perpendicular to the axis of the two rings. One edge of the slit is excited or energized in the immediate neighborhood of the center of symmetry of the antenna. Ground is connected to the middle point of at least one ring located on the axis on the other side of the center. The antennas may be assembled into networks. They may be constructed as double-faced printed circuits.

Abstract: The invention relates to doublet plates and the method of making them so t they may operate at very high frequencies.

Abstract: A folded dipole antenna system for use in the transmission reception of radio frequency energy by a radio frequency generator capable of continuous operation over an entire extremely broad bandwidth while maintaining an effective radiated power factor and a substantially linear visual standing wave ratio of less than 2 to 1 for each frequency over the entire operational bandwidth. The antenna system exhibits a substantially shortened overall length which is proportional to the entire operational bandwidth.

Abstract: A communication system for receiving signals from both relatively low power level portable transmitters and relatively high power mobile transmitters wherein the receiving antenna utilizes selectively gain controlled vertically and horizontally polarized elements for enhancing signals from the portable transmitters and from longer range mobile transmitters while, at the same time, degrading signals from near field mobile transmitters.

Abstract: An improved microwave proximity sensor including 1/4-wavelength folded dipole antenna performing the functions of a transmitting antenna, a receiving antenna, and a frequency determining element in a microwave oscillator.

Abstract: A dual polarized antenna couplet, comprised of a vertical quarter-wavelength radiator driven at its lower end and centered on a half-wavelength horizontal dipole radiator drooping its ends about 45.degree. from the center where it is driven in phase with the vertical radiator, produces a polarized wavefront at an angle between the vertical and the horizontal, such as 45.degree. when both are driven equally, with 1.5 db bi-directional gain in the horizontal pattern and in the vertical pattern as well. A similar parasitic couplet is used as a reflector behind the driven couplet, and two or more parasitic couplets are used as directors in front of the driven couplet. The elements of the antenna are coated with dielectric material to achieve a shortening effect of about 11% over the normal lengths of the antenna elements otherwise required.

Abstract: A dipole resonent loop antenna having a pair of semicircular, quarter-wave antenna elements curving away from each other in a generally circular configuration. The ends of the antenna elements are connected to each other through a pair of generally T-shaped insulative couplers having their center legs extending toward each other. A hollow boom positioned diametrically in the circular configuration has its ends secured to the center legs of the couplers. The center of the boom is then mounted on a vertical mast so that the mast extends generally along the axis of the circular configuration. A co-axial cable having a pair of conductors runs along the outside of the mast and passes into the interior of the boom through a center aperture. The conductors extend along the interior of the boom toward one of the couplers where they exit through an aperture in the outer wall of the coupler and are secured to respective antenna elements by screws passing through the coupler and the antenna elements.

Abstract: A miniature antenna which is rugged, extremely light-weight and which is especially adapted for reception across the entire FM band comprising an omnidirectional half-wave dipole having feed structure comprised of curved overlapping dipole element points connected to a solid state amplifier having staggered tuned input and output circuits. The input to the amplifier is maintained essentially balanced to preserve the omnidirectional pattern of the dipole.The physical location of the solid state amplifier is such that it is directly connected to the feed point of the dipole eliminating transmission line losses.The coaxial cable is employed in a diplexed manner for connecting the DC power supply to the solid state amplifier and for connecting the amplified output signal to an impedance converter which is to provide proper impedance match for the antenna input signals of an FM tuner/receiver.

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: A folded back doublet antenna including two symmetrical half-plates separd at their one ends by a cut, a long, continuous plate separated from one side of each of the half-plates by a gap, linking sections joining the other external ends of the half-plates to respective ends of the continuous plate, and a line feeding the antenna in the vicinity of the cut and extending along the axis of symmetry of the half-plates. The half-plates have a common width, which is much larger than the width of the continuous plate. The half-plates constitute an input side and the continuous plate constitutes a folded back side.

Abstract: An apparatus and method wherein an electrical impulse source transmits a radar-type signal through an antenna into the ground and is reflected by a target. The reflected signal or echo is detected by the antenna and an analog-to-digital converter converts it to a digital form which may be readily operated on, stored and recalled. A memory stores the information until recalled for comparison with a subsequent signal to give an indication of the location of metallic and non-metallic buried targets.

Abstract: An apparatus and method wherein an electrial impulse source transmits a radar-type signal through an antenna into the ground and is reflected by a target. The reflected signal or echo is detected by the antenna and an analog-to-digital converter converts it to a digital form which may be readily operated on, stored and recalled. A memory stores the information until recalled for comparison with a subsequent signal to give an indication of the location of metallic and non-metallic buried targets.

Abstract: A thick folded doublet antenna, the diameter of the current-receiving wire of which is on the order of ten times greater than that of the folded wire, the current-receiving wire comprising two half-wires of exterior symmetrical cylindrical form terminating at the center in two opposed frusto-conical portions, the small bases of which are close to each other, a coaxial conductor having an impedance of approximately 50 ohms extending axially through one of the half-wires, characterized in that the central conductor of the coaxial line is extended across the space between the bases of the frusto-conical portions and penetrates coaxially into a bore in the other half-wire, the central conductor being insulated from the other half-wire, the length of penetration of the central conductor being very short, and the coaxial line being supplied with signals at frequencies whose wavelengths are approximately six times the total height of said doublet antenna.

Abstract: A thick folded dipole having an operating frequency which is far less than he first resonance frequency. The dipole includes a folded strand and a thick fed strand having a diameter which is about ten times greater than the diameter of the folded strand. The fed strand comprises two spaced apart cylindrical half strands having ends in the form of conical frustums and coaxial bore holes. A center conductor of a coaxial cable extends through the folded strand, the bore hole of one half strand, the space between the half strands and into the bore hole of the other half strand. Symmetrical spaced apart short circuits for matching the radiation impedance of the dipole by varying the distance between the short circuits are provided between the fed strand and the folded strand. In another embodiment there is disclosed a thick folded half dipole including a folded half strand and a thick fed cylindrical half strand.

Abstract: A dipole antenna adjustable in span and distance to the reflector provides higher gain reception for a television receiver. By maintaining the ratio of span to distance constant optimum tuning is possible over a given band of frequencies. Tuning adjustment control is obtained from behind the reflector to eliminate interference with the radiation pattern of the antenna. BACKGROUND OF THE INVENTIONThe present invention relates to tunable communication antennas and more specifically to a directional antenna tunable over the UHF band of television frequencies.More and more in recent times VHF channels for television broadcasting in many areas of the country has become limited and the need has greatly increased for UHF channel utilization. Broadcasting in the UHF band, however, presents the problem of greater transmission path loss and higher gain antenna systems are required.