Abstract: Field Configurable Radiation Antenna Device for fixed dipole antenna comprising of a hollow tube and at least one pair of directional vanes is described. The beam direction of the antenna can be changed by operationally connecting multiples pairs of directional vanes to the hollow tube and by rotating the directional vanes relatively outer peripheral surface of the hollow tube. Such adjustments allow the user to tune the antenna to meet new or unforeseen coverage issues.

Abstract: Disclosed are systems and methods which provide multi-band antenna elements using multiple radiating branches interconnected with a feed plate, thereby providing a multi-band antenna element having a single feed. Additionally or alternatively, a wide band antenna configuration is provided utilizing multiple radiating branches of a multi-band antenna element of the present invention. Embodiments utilize one or more reflectors, such as to provide directivity and/or radiation pattern shaping, including utilizing one or more radiating branches of a multi-band antenna element as a reflector for another one or more radiating branches of the multi-band antenna.

Abstract: A frequency modulation antenna includes: a hermetically sealed driver assembly, which includes a driver tube, a gamma tube, a spacer stamping between the driver tube and the gamma tube, and an impedance matching block assembly between the driver tube and the gamma tube. The antenna eliminates conventional sources of signal degradation and interference due to its bi-directional nature, the hermetic sealing of the driver assembly, the coupling methods that prevent corrosion, and the dielectric coating. The antenna is further mounted to provide strength against the elements, facilitated by the precise mating of the driver assembly, the impedance matching block assembly, and a cleat to the mounting block, and the engagement of the teeth of the cleat and the serrations of a U-bolt to a pole. The antenna is significantly smaller than many conventional antennae while still being able to receive signals of low power without undue degradation or interference.

Abstract: An antenna system with at least one tunable dipole element with a length adjustable conductive member disposed therein that enables the antenna to be used over a wide range of frequencies. The element is made of two longitudinally aligned, hollow support arms made of non-conductive material. Disposed longitudinally inside each element is a length adjustable conductive member electrically connected at one end. In the preferred embodiment, each conductive member is stored on a spool that is selectively rotated to precisely extend the conductive member into the support arm. The support arms, which may be fixed or adjustable in length, are affixed at one end to a rigid housing. During use, the conductive members are adjusted in length to tune the element to a desired frequency.

Abstract: A hand-held dual frequency satellite communication antenna of circular polarization-capable characteristics is disclosed. The antenna system is based on Yagi/Udi spaced elements, including tuned trap-enabled dual frequency elements, disposed in orthogonal planes of a hand-receivable antenna boom element. The antenna system is fabricated from low cost readily obtainable materials and in a manner permitting easy disassembly and packaging for carriage to an isolated location of usage. Configuration of the disclosed antenna system for transmission and reception in two different popular amateur radio satellite communication bands is included. Antenna system field pattern characteristics and actual element lengths are included in the disclosure.

Abstract: An antenna system with at least one tunable dipole element with a length adjustable conductive member disposed therein that enables the antenna to be used over a wide range of frequencies. The element is made of two longitudinally aligned, hollow support arms made of non-conductive material. Disposed longitudinally inside each element is a length adjustable conductive member electrically connected at one end. In the preferred embodiment, each conductive member is stored on a spool that is selectively rotated to precisely extend the conductive member into the support arm. The support arms, which may be fixed or adjustable in length, are affixed at one end to a rigid housing. During use, the conductive members are adjusted in length to tune the element to a desired frequency.

Abstract: A directionality switching antenna apparatus of the present invention is provided with radiator 102 in folded form, folded at a length of predetermined length from a feeding point of ground plane 101, with one end thereof connected to the feeding and with the other end thereof shorted with ground plane 101, a plurality of parasitic elements 103 spaced in the vicinity of radiator 102 each with an element length set to provide the parasitic elements with an electrically symmetrical relation to the center axis of radiator 102, inductors 104 loaded on respective parasitic elements 103, diodes 105 connected to ground plane 101, switching elements 106 that connects in parallel respective inductors 104 and respective diodes 105 between respective parasitic elements 103 and ground plane 101.

Abstract: A printed Yagi antenna of the present invention has a circuit board, a driven element having an impedance &OHgr;d and being printed on the circuit board, a director element printed on the circuit board, a reflector element printed on the circuit board, a microstrip transmission line, and a coaxial cable having and impedance &OHgr;c. The coaxial cable feeds the driven element via the miscrostrip transmission line and &OHgr;c is approximately equal to &OHgr;d. Further, the spacing between the reflector element, the driven element, and director elements are chosen so that an optimum balance is achieved between directional gain and performance sensitivity. The printed Yagi antenna has a partial folded driven element having a J shape which is grounded at the mid-point of the longest portion of the element. The configuration allows for a coaxial cable to be attached directly to the microstrip transmission line without the use of a matching network or balun.

Abstract: A Yagi antenna array is specifically designed for insertion in a thin wing leading edge radome. Tubular elements for driver, director components are inserted within the structural web of the radome and critical dimensions of antenna components, relative to wavelength, help achieve superior performance in the compact package.

Abstract: A combined VHF/UHF active antenna, suitable for indoor use, includes a common element that serves as a reflector for UHF signals and as a director for VHF signals. The VHF element is bent upon itself to permit its packaging as a consumer product accessory.

Abstract: A parasitic antenna array (Yagi-Uda or loop type) for multiple frequency bands has its driven and parasitic elements interlaced on a single support boom. In a first aspect of the invention, series resonant circuits are located in one or more parasitic director elements in order to minimize the deleterious mutual coupling effect between directors of different frequency bands. In a second aspect of the invention, an inductance is placed across the feed point of the driven element of one or more non-selected frequency bands in order to minimize the bandwidth narrowing effect of closely-spaced driven elements and to provide a desired feed point impedance at the driven element of the selected frequency band. Although the two aspects of the invention may be used without one another, they are advantageously employed together. In addition, the second aspect of the invention may be applied to closely-spaced driven elements that are not part of a parasitic array.

Abstract: An antenna assembly for transmitting a radio signal from a radio signal transmitting device includes an antenna unit comprised of a dipole driven antenna member for transmitting a radio signal from the radio signal transmitting device. A radiation reflector reflects the radio signal transmitted by the driven antenna member, and a support member supports the driven antenna member and the radiation reflector so that a predetermined gap is precisely maintained between the driven antenna member and the radiation reflector. A shielding member shields a portion of the radio signal transmitted by the driven antenna member in a direction toward the shielding member. The antenna unit is pivotally mounted so that it is disposable at selectable positions relative to the shielding member. The output of the radio signal transmitted by the driven antenna member can be controlled depending on a position of the antenna unit. The dipole driven antenna member comprises a first and a second segment made from a metal foil.

Abstract: A wireless transceiver includes a dielectric substrate having first and second major surfaces on which an RF circuit and a baseband processing circuit are mounted, and a printed circuit antenna formed on the substrate. The printed circuit antenna has at least one director formed by strip conductors disposed on the substrate, a reflector formed by the edge of a ground area disposed on the substrate, and a dipole formed by strip conductors on the substrate. The dipole is positioned between the reflector and the director. An antenna with this low profile and compact antenna structure has high directivity.

Abstract: A no-loss, multi-band, adaptable Yagi style antenna employs a multi-element driven cell having a center element and one or more adjacent elements on each side of the center element. The adjacent elements of the driven cell are electrically shorter than the center element, thereby permitting the driven cell to be tuned to two or more frequency bands. The antenna is fed by a feedline connected to a common feed point at the center of the center element in the driven cell. Parasitic director elements are positioned in front of the driven cell and are tuned to the highest band of the driven cell. Parasitic reflector elements for one or more frequency bands are positioned behind the driven cell, with these elements tuned to actual operating frequencies of the antenna.

Abstract: A multiple beam antenna array utilizing strategically placed parasitic elements to control side lobe levels is disclosed. Two specific arrangements of such parasitic elements are taught. A first preferred arrangement of parasitic elements provides for their placement between a ground plane and a plane of active antenna elements. An alternative preferred arrangement of parasitic elements provides for their placement both between a ground plane and a plane of active antenna elements, as well as in front of the active antenna elements. Both such embodiments provide improved side lobe control over a similar antenna system without parasitic elements. Moreover, the characteristics of the main lobe are improved by both embodiments.

Abstract: A transmitter direction identifier is disclosed in conjunction with an automotive keyless entry assembly. The transmitter direction identifier includes a transmitter for sending a coded signal; a receiver for receiving the coded signal from the transmitter; a spatial differentiator for identifying the direction of the transmitter relative to a receiver from the coded signal received from the transmitter, the spatial differentiator creating a location signal; and a control unit electrically connected to the spatial differentiator wherein the control unit converts the location signal into command signal for subsequent use.

Abstract: A driven element is disposed on an antenna axis for transmission of electromagnetic energy in a transmission direction along the antenna axis. First and second parasitic arrays are disposed on opposite sides of the antenna axis in the transmission direction from the driven element. At least a portion of the antenna axis adjacent to the parasitic arrays is without parasitic elements. Each parasitic array has a plurality of parallel parasitic elements or directors spaced apart along a respective array line that includes a proximal portion adjacent to the driven element that extends in a general direction that is at an acute angle to the transmission direction. The first and second parasitic arrays are sufficiently close to the antenna axis to produce a radiation pattern that has a lobe with greatest magnitude in the transmission direction.

Abstract: The invention uses a modified Yagi-Uda antenna as a directional antenna for remote entry applications for transportation vehicles. To reduce the area that the antenna requires for packaging in a vehicle headliner, the antenna employs a shared reflector for plural reception zones on opposite sides of the vehicle. Since the antenna is packaged close to body sheet metal, a folded dipole is used as the antenna feed element to increase input impedance and simplify impedance matching with the receiver.

Abstract: A multiple-frequency monopole or dipole antenna or antenna element that exhibits resonance at multiple arbitrary predetermined frequencies at a single feedpoint includes a driven conductor operative on a first arbitrary predetermined frequency and including a feedpoint. A number n of additional non-driven conductors, wherein n is at least one, resonant at respective n arbitrary predetermined frequencies different from the first frequency are disposed in substantially parallel spaced relationship at a predetermined spacing to electromagnetically couple the driven and non-driven conductors and produce a non-reactive impedance at the feedpoint at the first and at each n additional frequency. Preferably, the predetermined spacing of the driven and non-driven conductors is determined according to the equation: ##EQU1## where d.sub.

Abstract: A directional scanning antenna includes a circular array of a plurality of antenna elements extending several wavelengths in diameter. The number of antenna elements are sufficient to form a plurality of directionally-oriented subsets of active antenna elements and associated subsets of parasitic antenna elements. An antenna feed system provides connections to each one of the plurality of antenna elements that include connections to electronically variable reactances and connections to a source or receiver of electromagnetic energy. The antenna feed system is controllable to provide connections between the subsets of active antenna elements providing wave propagation and reception in one or more directions and to provide connections between a plurality of the remainder of antenna elements in associated subsets of parasitic antenna elements to assist the directionality of the antennas.

Abstract: There is provided a new and useful field adjustable sectoral antenna comprising a flat reflecting surface having a front surface and first and second sides; at least one radiating element mounted in front of the front surface; and a pair of side panels each having front and rear edges and inner and outer surfaces; and wherein the panels are mounted with their inner surfaces along respective ones of the first and second sides of the reflecting surface for forward and rearward sliding movement of the side panels relative to the reflecting surface.

Abstract: A directional microstrip antenna includes a driven patch surrounded by an isolated reflector and one or more coplanar directors, all separated from a groundplane on the order of 0.1 wavelength or less to provide endfire beam directivity without requiring power dividers or phase shifters. The antenna may be driven at a feed point a distance from the center of the driven patch in accordance with conventional microstrip antenna design practices for H-plane coupled or horizontally polarized signals. The feed point for E-plane coupled or vertically polarized signals is at a greater distance from the center than the first distance. This feed point is also used for one of the feed signals for circularly polarized signals. The phase shift between signals applied to feed points for circularly polarized signals must be greater than the conventionally required 90.degree. and depends upon the antenna configuration.

Abstract: This Yagi-Uda-type antenna includes also a sleeve embracing the dipole. The sleeve may be a closed cylindrical element surrounding the dipole or it may comprise a pair of discrete elements forming an "open sleeve". The dipole, sleeve, reflector, and director elements may be in filamentary form, or they may be fabricated from stripline.

Abstract: In a guided missile, a microstrip antenna, including a patch radiator with parasitic elements, flush-mounted and conforming to the side of the missile, producing an antenna beam which is tilted in required direction for use as a link or fuse antenna is shown. Parasitic elements are used to direct the beam away from the antenna normal to the desired direction.

Abstract: An axial mode helical antenna includes a metal belt member disposed around the reflector of the antenna in order to permit use of reduced diameter reflectors and, therefore, to produce a small helical antenna having increased directivity.

Abstract: The described embodiments of the present invention provide a high-gain antenna while allowing for the inclusion of devices within the antenna array. In one embodiment of the invention an array of receiver/transmitter elements is positioned in a pan-like reflector base. The elements are positioned one-quarter of a wavelength from the surface of the base. The wavelength is the wavelength of the chosen frequency of transmission or reception of the antenna. A partially reflective plate is positioned one-half wavelength from the base and thus one quarter wavelength from the elements. Reflective disks are also positioned one-half wavelength above the base and are positioned directly above the elements. The disks create a resonant cavity around the elements for waves of the chosen frequency arriving from near normal to the plane of the base or being emanated from the elements at a normal or near-normal angle. The partially reflective plate extends this resonant area spatially from the element.

Abstract: A planar array of radiating elements which includes a plurality of radiating elements which are capable of operating upon electromagnetic signals of different frequency bands in a single planar array.

Abstract: An antenna for providing a vertically polarized omnidirectional horizontal radiation pattern comprising colinear dipoles. Suitable feeding arrangements are provided for electromagnetically feeding the dipoles with a signal. An axially extending conductive member is spaced on either side of the colinear dipoles. The axis of each of said conductive members as well as the axis of the dipoles are colinear and parallel.

Abstract: The directivity as well as the gain of an antenna element associated with a finite length reflector, which includes a feed antenna such as a dipole antenna and a reflector having a finite length of several wavelengths or less, are improved by disposing a non-feed loop element having a peripheral length of about 2 wavelengths along a common imaginary plane with the feed antenna so as to surround the feed antenna. Preferably, the non-feed loop element is disposed in parallel to the reflector, and more preferably it is disposed nearly symmetrically with respect to the center of the feed antenna.

Abstract: A multi-band multi-element directional antenna array having a driven element and at least one parasitic element with a network at the center of each element interconnecting element opposite side radiators. While some of these would be a driven element and either a reflector or director parasitic element array most applications call for at least three elements, a driven element, a reflector element and a director element, and for some applications, additional parasitic director elements are added. While antenna arrays embodying features hereof may be adapted as two band f.sub.1 f.sub.2, f.sub.2 f.sub.3, or f.sub.1 f.sub.3 antenna arrays, primary useage would be in a three radio band f.sub.1, f.sub.2, f.sub.3 version with band nominal center frequencies related, approximately by the progression 1, 1.5, 2 (example 14, 21, and 28 MHz).

Abstract: A novel grid-type corner reflector adapted to direct circularly polarized waves is described, involving critical and uneven grid reflector rod spacings and fed dipole tilt angles, with adaptation for circular passive directors, as well.

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: This disclosure is concerned with compensating for unsymmetrical antenna receiving or transmitting patterns caused by unbalanced driven element feed, by compensatory unsymmetrical interaction with parasitic director and/or reflector elements.

Abstract: A compact, all channel television antenna system is provided for improved reception within buildings where multiple reflections or ghosting and weak signals are typical operating conditions. The high performance in this environment with a very small antenna is achieved by the antenna's directive gain and pattern nulls, good impedance matching, low acceptance of vertical polarization, band switching, and repeatable orientation of the antenna. The antenna is characterized by a miniature, symmetrically top-loaded dipole and efficient matching circuit at the lower VHF television band. The top-loading elements are reused as parasitic elements in a compact, directive array at the upper VHF channels. Similarly, in the UHF television bands bending and top loading is used to reduce the size of radiators and to provide loading for the VHF bands. A construction of UHF half loops in parallel is used with a system of reflecting and directing elements.

Abstract: This invention concerns itself with improvements to cubical quad antennas. The chief disadvantage to cubical quad antennas is their relative lack of strength and vulnerability to high winds and icing conditions. The present invention provides for a spreader reinforced crossarm system that adds appreciably to the strength of these antennas. There is also the added advantage that additional elements can be added and supported by the aforementioned guy line support system, thus alleviating the necessity for a crossarm assembly for each element. The one additional advantage of the invention is that elements can be supported by the ends of the spreaders themselves, thus affording a greater distance between elements than would be possible with just the boom and no spreaders with the effect of increasing the gain of the antenna array.

Abstract: A truncated conical member of conductive material is mounted forward of a pair of crossed dipoles, the legs of which are inclined toward a reflector. The pair of dipoles cross orthogonal to each other at the dipole centers with the dipole halves being fed with equal power in the relative phase rotation of 0.degree., 90.degree., 180.degree. and 270.degree..

Abstract: A yagi antenna having a director element, a half-wave active dipole element, and a reflector element mounted on an antenna boom. All antenna elements are rods that are telescopically adjustable in length from a collapsible position to an operating length for a predetermined frequency of operation, and removable from threaded mounting for storage. The director element and reflector element are slidably adjustable on the antenna boom for independent spacing with respect to the half-wave active dipole element. The antenna boom has two mast support holes; one for horizontal polarization and the other for vertical polarization. A ferrite core member surrounds a coaxial cable connecting the half-wave active dipole element to a coaxial connector, and provides balun action between the coaxial cable and a balanced antenna feed point.

Abstract: A small wavelength antenna comprises a paraboloidal reflector with a rim about its periphery and a single feed dipole, backed by a circular cup-shaped cavity. The reflector, dipole and cavity are symmetrically aligned about the antenna axis. The reflector diameter is on the order of 3 to 4.lambda. and the cavity diameter is less than 1.lambda. and more than 1/2.lambda., where .lambda. is any wavelength with the band of operation of the antenna. The cavity depth is on the order of 0.25 of a selected wavelength within the band, at which maximum pattern symmetry is desired, and the dipole is substantially flush with the open end of the cavity. The rim height is on the order of one-half of a selected wavelength within the band of operation of the antenna at which gain is to be optimized.