Abstract: The present invention provides a High Resolution Scanning Reflectarray Antenna (HRSRA) for the purpose of tracking ground terminals and space craft communication applications. The present invention provides an alternative to using gimbaled parabolic dish antennas and direct radiating, phased arrays. When compared to a gimbaled parabolic dish, the HRSRA offers the advantages of vibration free steering without incurring appreciable cost or prime power penalties. In addition, it offers full beam steering at a fraction of the cost of direct radiating arrays and is more efficient.

Abstract: An antenna system (100) at a mobile communication station (150) comprises a main unit (101) which comprises at least one network antenna (102), a relay antenna (103) for communication with the mobile station (150) and an interface unit (104) connected to the network antenna (102) and the relay antenna (103). The antenna system (100) also comprises a local antenna (105) in the mobile communication station (150) for communication with the relay antenna (103) in the main unit (101). The main unit (101) is attachable to and detachable from the mobile communication station (150), while at the same time the relay antenna (103) and the local antenna (105) lack galvanic contact. In an attached state, the relay antenna (103) and the local antenna (105) are electrically connected to each other by means of a capacitive connection, and in a detached state, the relay antenna (103) and the local antenna (105) are electrically connected to each other by an electric far-field connection.

Abstract: A TV antenna assembly is constituted by a first belt-like antenna element and a second linear antenna element, and is stuck in a loop onto the inner surface of a door mirror case. Improved characteristics are obtained owing to a combination of the capacitance feature of the first antenna element and the inductance feature of the second antenna element. The wiring is easily routed since the antenna assembly is connected to the side of the car body through the second antenna element. The GPS antenna assembly is arranged on the rear side of the mirror.

Abstract: A chip antenna 10 includes, inside a rectangular-parallelepiped base 11 having barium oxide, aluminum oxide, and silica as main constituents, a conductor 12 wound in a spiral form along the length direction of the base 11, and an LC parallel resonance circuit 13, which is inserted in the intermediate portion of the conductor 12 and which is connected electrically in series with the conductor 12, and includes, on the surface of the base 11, a power-feeding terminal 14 for applying a voltage to the conductor 12. The conductor 12 is separated into a first conductor 121 and a second conductor 122 by the LC parallel resonance circuit 13. The LC parallel resonance circuit 13 is formed of a coil L1, which is an inductance element, and a capacitor C1, which is a capacitance element, which are connected in parallel.

Abstract: An antenna device realized in a small size and at a decreased cost owing to a reduction in the feeder circuits and in the harness portion. The antenna device includes a plurality of antenna units 11 to 18 integrally arranged neighboring each other, and a core unit 20 arranged integrally with said antenna units to feed electric power to said antenna units, wherein each of said antenna units and said core unit has detachable joining/securing portions and connector portions, and each of said antenna units is electrically connected to said core unit via said connector portions. The antenna units required by a user are divided into blocks for each of the functions and are selectively utilized in an aggregated manner.

Abstract: An artificial anisotropic dielectric material is used as a microstrip patch antenna substrate and can achieve dramatic antenna weight reduction. The artificial dielectric is comprised of a periodic structure of low and high permittivity layers. The net effective dielectric constant in the plane parallel to the layers is engineered to be any desired value between the permittivities of the constituent layers. These layers are oriented vertically below the patch to support electric fields consistent with desired resonant modes. Substrates may be engineered for both linearly and circularly polarized patch antennas. Substrate weights can be reduced by factors of from 6 to 30 times using different types of high permittivity layers. This concept has numerous applications in electrically small and lightweight antenna elements, as well as in resonators, microwave lenses, and other electromagnetic devices.

Abstract: An aperture-coupled planar inverted-F antenna (PIFA) including a radiating patch formed on one side of a ground plane and separated therefrom by a first dielectric which may be air, foam or another suitable material. A shorting strip connects a side of the radiating patch to the ground plane at a point corresponding to a dominant mode null, such that the size of the radiating patch may be reduced by a factor of two. A microstrip feedline is arranged on an opposite side of the ground plane and separated therefrom by a second dielectric which may be part of a substrate formed of printed wiring board material. Signals are coupled between the microstrip feedline and the radiating patch via an aperture formed in the ground plane. The use of aperture coupling avoids the excessive cost associated with conventional TEM transmission line or coaxial feeds, while providing improved manufacturability and ease of integration relative to PIFAs with conventional feeds.

Abstract: A helical antenna capable of covering a plurality of frequency bands and using a common feeder system for antenna elements adjusted to the respective frequency bands. First and second antenna elements having lengths corresponding to wavelengths of the frequency bands to be used are arranged helically at a specified pitch angle and spaced apart in the circumferential direction of a cylindrical body on the surface of a dielectric sheet wound around the outer circumferential surface of the cylindrical body. Coupling lines to be electromagnetically coupled to one-side ends of the antenna elements being adjacent to one another are formed on the surface of the dielectric sheet. A signal is fed from a common feeder circuit through the coupling lines to the respective antenna elements.

Abstract: An antenna for receiving and/or transmitting electromagnetic waves, comprising an array of antenna elements including at least one longitudinal row of antenna elements (7) located at a distance (d) from each other, each such row of antenna elements being adapted to receive and/or transmit a dual polarized beam including two separate, mutually isolated channels. Along each longitudinal row of antenna elements, in the vicinity of the gap between a respective pair of adjacent antenna elements, preferably at the side of the centre line (C) of the row, there are disposed parasitic elements (8a, 8b) serving to influence the mutual coupling between said adjacent antenna elements in such a way as to improve the isolation between the separate channels.

Abstract: A multiband millimeterwave antenna system for communicating signals in multiple frequency bands is disclosed. A main antenna body is connected to antenna extensions by micro-electro-mechanical switches. By opening and closing the switches, the length of the antenna can be altered. The antenna is coupled to a microstrip feed line by an aperture. A series of matching stubs match the impedance of the feed line for the various signal frequencies.

Abstract: A dual-frequency antenna (100) includes a transmit element (110) that is substantially planar and that is formed from a conductive material, such as aluminum, having a loaded slot (140) formed therethrough for transmission of first radio frequencies. The antenna (100) also includes a receive element (115) that is substantially planar and that is also formed from a conductive material having a loaded slot (155) formed therethrough for reception of second radio frequencies. The transmit and receive elements (110, 115) are mounted in a single plane adjacent to a ground plane (105) that is held only a small distance from the transmit and receive elements (110, 115). Preferably, the height of the antenna (100), i.e., the distance between the transmit and receive elements (110, 115), and the ground plane (105) is equal to or less than about 1.4 centimeters for low-profile mounting on truck-drawn trailers.

Abstract: An automatic lamp control device in which a Doppler radar module, a switching unit for switching a lamp circuit on and off, a circuit configuration for evaluating Doppler radar module signals and for producing signals for controlling the switching unit, and a power supply unit for supplying current to the Doppler radar module and to the circuit configuration are provided on a printed circuit board configuration. The lamp control device reacts to movements within the transmitting and receiving range of the Doppler radar module. The range is independent of the ambient temperature. The lamp control device can be configured to save space, in such a way that it can be integrated completely in a standard flush-mounted box.

Abstract: Methods of forming conductive lines, antennas, and wireless communications devices, and related conductive lines, antennas and wireless communications devices are described. In one aspect, a substrate having an outer surface is provided. A first layer of conductive material is formed over the outer surface. A second layer of conductive material is formed over only portions of the first layer. Using the second layer as a masking layer, the first layer is etched selectively relative thereto to provide a conductive line comprising the first and second layers. Preferably, the first layer is more conductive than the second layer. In a preferred implementation, the conductive line constitutes an antenna construction which is suitable for use in a wireless communications device. In another preferred implementation, an antenna, an integrated circuitry chip, and a battery are mounted on a substrate and operably interconnected to provide an integrated circuitry chip, with the antenna being formed as described above.

Abstract: Due to the frequency dependence of phasing mechanisms applied in planar printed reflectors, when using planar printed reflector antennas beam squint occurs as the frequency is scanned within the operating band. In order to reduce or eliminate beam squint, an incident signal incident upon a reflector is altered in such a way that the outgoing signal retains a same direction. In an embodiment, this is achieved by providing feed elements in different locations, each feed element for feeding a signal of a different frequency. In another embodiment, two reflector arrays are used wherein beam squint caused by the first reflector array is compensated for by the second reflector array.

Abstract: A planar array antenna having radiating elements characterized by dual simultaneous polarization states and having substantially rotationally symmetric radiation patterns. A distribution network, which is connected to each dual polarized radiator, communicates the electromagnetic signals from and to each radiating element. A ground plane is positioned generally parallel to and spaced apart from the radiating elements by a predetermined distance. The conductive surface of the ground plane operates to image the radiating elements over a wide coverage area, thereby enabling a radiation pattern within an azimuth plane of the antenna to be independent of any quantity of radiating elements. Side walls, placed on each side of the array of radiators, can operate in tandem with the ground plane, to reduce the half-power beamwidth in the azimuth plane for a selected radiator design.

Abstract: There is provided a laminated aperture antenna in which a conductor wall composing the antenna is composed of a plurality of through conductors disposed at predetermined intervals and a plurality of sub-conductor layers disposed between dielectric layers of a dielectric substrate so as to electrically connect the plurality of through conductors within the dielectric substrate formed by laminating dielectric layers, or in which a resonant space is formed by a space of the dielectric surrounded by the conductor wall composing the antenna formed as described above, a lower conductor layer electrically connected to that and an aperture of the upper conductor layer corresponding to the antenna conductor wall. There is also provided a multi-layered wiring board comprising such laminated aperture antenna. Such laminated aperture antenna may be miniaturized and thinned and may be readily fabricated by the conventional lamination technology.

Abstract: A chip antenna 10 is formed of a rectangular prism substrate 11 made of a dielectric material (relative magnetic permeability: approximately 6.1) essentially consisting of barium oxide, aluminum oxide, and silica. A conductor 12 is spirally wound within the substrate 11 in the longitudinal direction of the substrate 11. A power feeding terminal 13 is formed on a surface of the substrate 11 and is connected to one end of the conductor 12 in order to apply a voltage to the conductor 12. A trimming electrode 14 generally formed in the shape of a rectangle is formed on a surface of the substrate 11 and is connected to the other end of the conductor 12. With the above configuration, a capacitive coupling is generated between the trimming electrode 14 and a ground (not shown) of a mobile communication unit on which the chip antenna 10 is mounted, and between the trimming electrode 14 and the conductor 12.

Abstract: A radiating structure, or antenna, includes an exciter patch which receives an excitation signal and a plurality of secondary patches which radiate the waves received from the exciter patch. The structure includes a reflective surface in the vicinity of the exciter patch and the secondary patches constitute semi-reflective surfaces. The combination is such that the waves radiated by the secondary patches are substantially in phase. The distance between the reflective surface and the secondary patches is substantially equal to half the wavelength to be transmitted. The structure maintains the purity of circular polarization over a wide angular sector.

Abstract: Dual polarized antenna device for wireless transmission of information using electromagnetic signals with polarizations orthogonal to each other, with at least one antenna element and at least one ground plane made from a first electrically conducting layer, at least one feeder network made from a second electrically conducting layer and a plurality of apertures in said ground plane, which apertures each consist of one or several aperture sections, and which extend between two end points, which apertures are arranged in at least one aperture group, with each aperture group being symmetrical relative to the planes which are defined by the two polarizations, and with each aperture group consisting of at least one first aperture, which aperture is centrally positioned in the group and is intended for the first polarization, and at least two outer apertures intended for the second polarization, symmetrically positioned on each side of the central aperture with the distance along a straight line between the end po

Abstract: A frequency-scanned end-fire phased-array antenna includes a board, a sinuous transmission line formed on the board, a plurality of end-fire antennas, and a plurality of couplers corresponding to the end-fire antennas, such that the transmission line is selectively coupled to the plurality of end-fire antennas via the plurality of couplers, for selectively coupling energy within the transmission line to the end-fire antennas. By varying the input frequency to the antenna over a narrow range, the direction of a main radiation beam emitted by the antenna can be scanned .+-.90 degrees from broadside. A single antenna board produces a frequency-scanned fan beam. Stacked antenna boards can produce a frequency-scanned pencil beam, or several independent frequency-scanned fan beams at different frequencies. The present antenna can operate in the microwave, millimeter-wave, terahertz, infrared, or optical frequency range.

Abstract: An apparatus and method for exciting an antenna with dual frequency bands which comprises feeding a first channel of the antenna with a first signal in the VHF band such that a first current is established in a first direction resulting in a first polarization, feeding a second channel of the antenna with a second signal such that a second current is established in a second direction resulting in a second polarization, and isolating characteristics of the first channel from characteristics of the second channel and the characteristics of the second channel from the characteristics of the first channel such that both the first channel and the second channel are adapted to transmit and receive energy within the same antenna structure without appreciable coupling between the first channel and the second channel.

Abstract: A patch antenna is provided with one or more tuning strips spaced therefrom and RF switches to connect or block RF currents therebetween. When a control system for the antenna selectively connects and isolates RF currents between certain of the tuning strips and the patch, the tuning strips change the effective length of the patch and thus the antenna's resonant frequency, thereby frequency tuning the antenna electrically over a relatively broad band of frequencies. The control system includes circuitry for rapidly switching the antenna to a desired frequency with minimal delay and with superior isolation from the antenna, making it suitable for use in DAMA, TDMA, and other frequency hopping applications.

Abstract: An antenna for use with portable duplex radio transceivers, such as those found in hand-held cellular telephones, which includes a pair of co-planar radiating patch elements elevated above a conductive surface by a conductive bar. The surface and bar define a reference ground plane which inherently isolates the patches. The patches are shaped so that they operate in a desired frequency band as well as band-pass filters--one of the patches is tuned to the transmit band and serves a transmit structure, and the other patch is tuned to the receive band and serves as a receive structure. Switching devices such as positive-intrinsic negative (PIN) diodes can be disposed along the space between the patches and the ground plane to allow each structure to be tuned. The antenna is efficient, because of inherent isolation between the receive and transmit patches, and eases the front end filtering functions traditionally performed by a duplexer. It can be completely enclosed within the chassis of a hand-held telephone.

Abstract: A high-gain monolithic antenna with high freedom of design has a signal circuit and a stripline dipole antenna which are provided on a substrate. A dielectric film and a conductor cover covering the dielectric film are provided on the upper surface of the substrate, in addition to a hole extending vertically downward to the underside of the substrate, a conductor wall being provided on the surface thereof. Furthermore, a metallic film is evaporated so as to contact both a metallic cover and a conductor wall. A first grounding conductor and a dielectric are provided on the lower surface of the substrate, and a second grounding conductor is provided on the upper surface of the substrate. A horn, which is tapered into the dielectric and the first grounding conductor thereby forming the shape of a quadrangular pyramid, is provided so as to overlap a hole etched into the substrate. Microwaves or milliwaves are radiated to/from the horn to/from the underside of the substrate.

Abstract: A foursquare dual polarized moderately wide bandwidth antenna radiating element is provided which, due to its small size and low frequency response, is well suited to array applications. The foursquare element comprises a printed metalization on a low-loss substrate suspended over a ground plane reflector. Dual linear (i.e., horizontal and vertical), as well as circular and elliptical polarizations of any orientation may be produced with the inventive foursquare element. Further, an array of such elements can be modulated to produce a highly directive beam which can be scanned by adjusting the relative phase of the elements. Operation of the array is enhanced because the individual foursquare elements are small as compared to conventional array element having comparable frequency response. The small size allows for closer spacing of the individual elements which facilitates scanning. Additionally, a family of trimmed foursquare antennas is provided which offer improved performance and size considerations.

Abstract: A small co-planar multiple frequency array antenna. Two printed antennae and a double U-shaped printed antenna are formed on a substrate. The projecting length D1 of the two printed antennae from the double U-shaped printed antenna, the longitudinal distance D2 and the transversal distance D3 between the two printed antennae and the double U-shaped printed antenna are adjusted to obtain the optimum matching for the resonance frequencies F1 and F2 (F1<F2). Here, D1 and the distance DD1 are adjusted to obtain a resonance peak at F2. F1 and F2 are determined by the length RL1, RL2 of the resonance edge portion of the double U-shaped printed antenna and the resonance edge portion of the two printed antennae. The width W1, W2 of the two printed antennae and the double U-shaped printed antenna are also adjusted to control the matching at F1 and F2.

Abstract: A frequency selective medium that is adapted to receive an incident electromagnetic radiation at an angle of incidence of about 45.degree. has two arrays of conductive elements on opposite parallel surfaces (20, 22) of a dielectric substrate. In one embodiment, the conductive elements are cross-dipoles (6) each having a horizontal dipole (10) and a vertical dipole (8) of different lengths and widths. In another embodiment, the conductive elements comprise a plurality of conductive gridded rectangular loops (40). The frequency selective medium allows incident waves that are within a passband of transmit frequencies to transmit through the medium, and reflects waves at frequencies within a stopband adjacent the passband. In other embodiments, meanderline polarizers (28) are added to cross-dipole and gridded rectangular loop frequency selective media to circularly or dual-linearly polarize incident linearly polarized waves.

Abstract: An antenna means to be mounted on a personal telephone is disclosed. The antenna means comprises a helical radiator, an elongated radiator extendable through the helical antenna, and a coupling means for activating the extendable elongated radiator, when in extended position. A more compact antenna means, with less need for receiving depth inside the telephone, is achieved by permitting the extendable elongated radiator, when in a retracted position, to extend at least partially inside the helical radiator. In the extended position the elongated radiator may be coupled to the telephone directly or via the helical antenna.

Abstract: An antenna unit which has a high gain and a wide bandwidth at a low resonance frequency thereof. The antenna unit comprises an antenna body and a power radiation electrode. The antenna body comprises a rectangular-prism-like substrate comprising a dielectric material, whose major ingredients are e.g., barium oxide, aluminum oxide and silica. A power supply conductor is provided in the substrate and is made of copper or copper alloy and is wound in a spiral in the direction of height of the substrate. A power supply terminal for applying a voltage to the power supply conductor is provided on a surface of the substrate. Further, a power radiation electrode, which comprises, e.g., a nearly rectangular metallic plate made of copper, copper alloy or aluminum, is provided on the surface of the substrate of the antenna body. This power radiation electrode is electrically isolated from the power supply conductor.

Abstract: A radio frequency antenna is fabricated by first injection molding a group of broadband radio frequency radiating elements from a polymeric material, metallizing each broadband radio frequency radiating element, and installing a transmission line within each broadband radio frequency radiating element. A support structure is prepared by injection molding at least one, and preferably multiple, flat support plates, and metallizing each plate. A pattern of electrical connectors is formed on the plates. A forward plate has a group of attachment locations thereon, and, collectively, the pattern of electrical conductors provide an electrical feed to each of the attachment locations. A broadband radio frequency radiating element is affixed, preferably by ultrasonic welding, to each of the plurality of attachment locations, with the transmission line of each broadband radio frequency radiating element in electrical communication with the electrical conductor extending to the respective attachment location.

Abstract: An antenna assembly for implementing an antenna internally in a mobile communications device. The antenna assembly includes a substantially planar antenna having terminals extending substantially perpendicular outward from the antenna and disposed adjacent and opposite one another. The antenna assembly also includes a connector having conducting surfaces that are disposed substantially parallel, on opposite surfaces of the connector. The connector may be mounted on a spacer that is mounted in the communications device, with the connector and conducting surfaces substantially perpendicular to the spacer. The antenna is placed on the spacer with the terminals of the antenna extending in the direction of the spacer along both sides of the connector and the terminals each contact one of the conducting surfaces of the connector. The antenna assembly may be secured in the device using a cover congruent with the outer covering of the device.

Abstract: A broad-band microstrip antenna implemented using a dielectric base as its main body is disclosed. The base has two sides where the dual-mode resonator is located on the first side, while the grounded plane is located on the second side of the dielectric base. The dual-mode resonator has a high-frequency resonator and a low-frequency resonator, which are partially positioned in parallel. Due to the electric-magnetic effects, these two resonators are mutually coupled to significantly increase the operating bandwidth. In addition, there is a feed line on the first side of the dielectric base, which connects to the dual-mode resonator to provide signal transmission. In addition, there is a grounded mask in the antenna, which is located on the first side of the dielectric base, to provide sheltering for the feed line, and connect to the grounded plane to form a closed area to provide a more complete radiation field pattern.

Abstract: An aperture-coupled antenna, comprising at least one antenna element including a number of substantially planar, mutually parallel radiating patches (1-3) being fed with microwave power from a feed network (6) via an aperture (5a, 5b) in a ground plane layer (4). The feed network (6) feeds microwave power in at least two separate frequency bands, including a first, relatively low frequency band and a second, relatively high frequency band. A first patch (2) radiates microwave power in the first frequency band and is provided with an aperture (9a, 9b) so as to couple microwave power in the second frequency band to a second patch (1), the microwave power in the second frequency band being fed from the feed network (6) via the apertures (5a, 5b; 9a, 9b) in the ground plane layer (4) and the first patch (2) to the second patch (1).

Abstract: An array antenna includes a plurality of patches arrayed on a first surface of a base board and a plurality of feeders connected to the respective patches so as to radiate or receive an electromagnetic wave via the patches. The patches include a plurality of first patches and a plurality of second patches. The feeders connected to the first patches are formed on the first surface of the base board, while the feeders connected to the second patches are formed on a second surface of the base board. Further, first and second transmitting and receiving circuits are provided on the first and second surfaces, respectively, of the base board, so as to provide an antenna device. The first transmitting and receiving circuit feeds or receives electrical signals to or from the first patches, while the second transmitting and receiving circuit feeds or receives electrical signals to or from the second patches.

Abstract: The effect of rain wetting a planar array antenna is reduced substantially by mounting the antenna with its radiating face facing downwards on an angle .alpha. of about 30-80.degree. to the horizontal and adjusting the angle .theta. of the main beam of the planar array antenna to its radiating face so that the angle .theta. of the main beam to the radiating face of the antenna and the angle .alpha. of the radiating face to the horizontal combine to direct the main beam at the elevation angle .omega. toward a selected target.

Abstract: The invention provides an antenna in which a signal is directly transferred from a planar dielectric transmission line to a primary radiator without having to perform transmission mode conversion from the planar dielectric transmission mode to another mode such as a coplanar transmission mode, a microstrip transmission mode, or a waveguide transmission mode thereby eliminating the transmission loss which would otherwise occur due to the transmission mode conversion. A dielectric resonator is disposed in the vicinity of the end of the planar dielectric transmission line PDTL formed between two slots disposed on both sides of a dielectric plate. Furthermore, a slotted plate, a lens supporting base, and a dielectric lens are disposed one on another.

Abstract: A monitor tag having a radio frequency transmitter and a patch antenna. The antenna is in communication with the transmitter and has a first conductive patch and a second conductive patch substantially parallel to each other, and separated from each other by a dielectric material in contact with both patches and having a thickness sufficient to create a gap between the patches wherein the radiation resistance will be controlled during operation of the antenna. The first conductive patch has a dimension of one-quarter or one-half wavelength, depending upon available space and desired pattern. Because the electric field is launched from the gap between the patches and is highly concentrated, bringing the monitor tag close to a metal object or attaching it thereto will have minimal impact on the impedance of the antenna.

Abstract: A compact, low cost antenna communicates with low and medium earth orbit satellites. The antenna includes a plurality of micro-strip elements arranged about an axis and positioned to illuminate upper elevation angles. The micro-strip elements are perpendicular to each other and are oriented toward the horizon at 90 degree increments. Furthermore, the micro-strip elements are tilted at a 50 degree angle. A quadrifilar helix is positioned at the center of the micro-strip elements and positioned to illuminate lower elevation angles. The micro-strip elements generate an omni-directional field pattern in the azimuth plane. The quadrifilar helix generates a high-gain, narrow beam-width field pattern that is also omni-directional in the azimuth plane. The antenna provides improved immunity to specular ground reflections by limiting reception of signals below a threshold elevation angle.

Abstract: A scanning antenna (1) has, a first waveguide (2) with parallel metal plates (10, 11), a waveguide feed (19) substantially at a focus (15) of the first waveguide (2), the plates (10, 11) being partially filled therebetween with a biconvex dielectric body (21) emanating a wave of planar phase front, and a planar waveguide bend (4) having a planar profile (13) redirecting an incident wave of planar phase front for propagation in a second waveguide (3) having an array of radiating antenna elements (5).

Abstract: An antenna comprising a plurality of negative resistance devices and a method for making same comprising employing a removable standoff layer to form the gap between the microstrip antenna metal and the bottom contact layer.

Abstract: An antenna is formed from a single sheet of generally planar metal that is cut to provide four geometric antenna shapes that comprise a ground plane element, a two-section shorting element that is defined by two generally parallel fold lines, a radiating element, and an arm that has one end fixed to a generally central portion of the radiating element and has a free end that extends toward a fold line. Folding the metal sheet on the two fold lines positions the radiating element above the ground plane element. A transmit/receive coaxial cable is aligned with a gap that is formed between the two sections of the shorting element. The cable's outer metal sheath is connected to a metal tab, and the metal tab is secured to a surface of the ground plane element. The cable's center conductor is secured to a surface of the radiating element. A radome and its mounting tab complete the antenna assembly.

Abstract: In a microstrip patch antenna, multipath signals from below the horizon can be reduced by forming ground elements along the edge of the dielectric substrate. Additionally, by using lugs and capacitive elements in the patch antenna, the bandwidth of the antenna can be expanded while maintaining all other antenna characteristics as good as possible.

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 retractable antenna module including a first, generally stationary plate and a second plate, movable relative to the first plate. The second plate moves between a retracted configuration of the module, in which the plates together function substantially as a feedthrough-fed antenna, and an extended configuration of the module, in which the second plate functions substantially as a monopole antenna.

Abstract: A GPS antenna cover comprises a box-like cover body formed by a top wall and four side walls, the cover body having an opened bottom, a GPS antenna receiving chamber defined by four inner walls extending perpendicularly from an inner face of the top wall toward the bottom, and a first holding member formed on and projecting inwardly from inner faces of the inner side walls for holding a GPS antenna unit from the side of the bottom, the GPS antenna unit inserted into the antenna receiving chamber through the bottom. The antenna receiving chamber includes a second holding member formed on and project inwardly from the inner face of the top wall for abutting against an upper face of the GPS antenna unit and urging the GPS antenna unit from the side of the top wall.

Abstract: A fixed radius tapered slot antenna (100) formed a dielectric substrate (10) with an electrically conductive layer (14) on one side. The slot is defined by two hemispherical shaped elements (12, 13). A common base (15) is also formed on the conductive layer behind the hemispherical shaped members. Preferably, a microstrip feedline (16) is formed on the side of the dielectric substrate to electromagnetically couple to the balun (18) adjacent the narrow end of the tapered slot. A contiguous array (102) of fixed radius tapered slot antennas (100) can be made on the same conductive layer of a dielectric layer. A reflector (30) can be integrated with the antenna array to improve the radiation pattern. The fixed radius tapered slot antenna has been proven to out-perform an exponentially tapered slot or Vivaldi antenna.

Abstract: The multi-band slot antenna structure and method uses a single antenna to cover at least two distinct reception frequency bands using only one excitation port. In a first type of configuration, dual resonant slots (320, 325) are placed in close proximity and driven using a single differential excitation port having a positive node (370) and a negative node (375). In a second type of configuration, a half wavelength conductor (560, 660, 760) is layered over a quarter wavelength slot (520, 720) or half wavelength slot (620), and when the conductor is heavily magnetically coupled to the slot, a virtual electric short is achieved across the slot. In a third type of configuration, a quarter wavelength conductor (1060, 1160) is layered over a quarter wavelength slot (1020) or half wavelength slot (1120), and the conductor is used to capacitively or inductively load the slot (1120) at frequencies other than the natural resonant frequency of the slot (1120).

Abstract: The present invention relates to antennas. One of the problems which arises during the operation of a linear array antenna with electrical downtilt is that cross-polar radiation currents are generated. These cross-polar radiation currents, if at the same frequency as the operating band of the antenna, interfere with the required gain of the antenna. The present invention provides a solution to cross-polar radiation currents with an antenna assembly comprising first and second apertured ground planes with an antenna probe feed network printed upon a dielectric substrate supported therebetween, the array of radiating elements having different phase input feeds, wherein an outwardly extending ground plane flange extends from one of the apertured ground planes. There is also provided a method of receiving and transmitting signals by means of a layered antenna of this construction.

Abstract: The invention provides a low-profile circular-polarization antenna that can be implemented at a reduced mounting cost of components. Two linear-polarization surface-mount antennas are mounted on a mounting substrate such that their planes of polarization are perpendicular to each other in the direction normal to the mounting surface, and an amplification circuit, a shield case for covering the circuit, and a phase circuit for sending signals having the same amplitude and a phase difference of 90 degrees to the two surface-mount antennas are provided on the same mounting surface.

Abstract: A planar diversity antenna for communications devices, such as radiotelephones, has two radiating elements secured to opposite sides of a dielectric substrate. One radiating element is parasitically coupled to a fed radiating element to resonate at respective adjacent frequency bands. Each radiating element has a meandering electrically conductive path. The planar diversity antenna is maintained in spaced apart, generally parallel relationship with a ground plane within a radiotelephone.