Abstract: Method and apparatus for steering an antenna beam using a periodic resonance structure (300). The method can include the step of electrically and magnetically coupling a first fluid dielectric (114) to a plurality of transmission line stubs (104) that are respectively coupled to a plurality of radiating elements (102) of a periodic resonance structure (300). The first fluid dielectric (114) is controlled to selectively vary an electrical length of each of the transmission line stubs (104). This permits directing an angle of a redirected RF beam produced by an incident RF signal (306) impinging on the periodic resonance structure (300).

Abstract: An on-board antenna including a radiation element provided on a dielectric substrate, and a grounding conductor surrounding a periphery of an outer edge portion of the radiation element at a position spaced away outwardly from the outer edge portion, wherein the radiation element has an inner cut-out portion so that the surface of the dielectric substrate to be exposed therethrough.

Abstract: A method and apparatus by which electromagnetic wave energy is passed through a beam-forming antenna thereby forming a capacitive surface reactance which eliminates E-plane edge currents on the antenna and balances hybrid electromagnetic energy modes resulting in symmetrical electromagnetic wave patterns.

Abstract: A cavity backed millimeter-wave antenna comprises a dielectric cavity within a semiconductor substrate having walls defined by a plurality of vias through the substrate, and a gas cavity external to the substrate aligned with the dielectric cavity. A ground plane side of the substrate may be devoid of ground plane conductive material substantially between the walls of the dielectric cavity. In a slot-antenna embodiment, a microstrip feed line may be disposed on the substrate across a slot over the cavities. The slot may be a rectangular region without conductive material on a circuit side of the substrate over the dielectric cavity. In a dipole embodiment, a first pole comprising conductive material may be disposed on a ground plane side of the substrate over the cavities, and a second pole comprising conductive material may be disposed on a circuit side of the substrate over the cavities.

Abstract: An antenna (100) includes an antenna radiating element (108) that is at least partially comprised of a conductive fluid (104). A dielectric structure (102) defines at least one cavity (110A, 110B) for constraining the conductive fluid. The antenna also includes a fluid control system (116A, 116B, 118A, 118B, 120A, 120B, 122) for selectively adding and removing the conductive fluid from the cavity for controlling a dimension of the antenna radiating element (108). The antenna radiating element (108) can be comprised of a plurality of cavities (110A, 110B), with each cavity defining a segment of the antenna radiating element (108).

Abstract: Low cost antennas and electromagnetic absorbing parts formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises conductive fibers, conductive powders, or in combination thereof in a resin base host wherein the ratio of the weight of the conductor fibers, conductor powders, or combination of conductor fibers and conductor powders to the weight of the base resin host is between about 0.20 and 0.40. The conductive fibers or conductive powders can be stainless steel, nickel, copper, silver, carbon, graphite, plated fibers or particles, or the like. The antenna elements can be formed using methods such as injection molding or extrusion. Virtually any antenna, ground planes, or shielding packages fabricated by conventional means of metal can be fabricated using the conductive loaded resin-based materials.

Abstract: The present invention provides a very small volume and broad band antenna for a portable appliance including a transceiver module with an independent ground and an antenna feed conductor, the antenna comprising a first conductive surface lying substantially in a first geometrical surface of non-closed curvilinear shape surrounding an inside space and connectable to the independent ground of the transceiver module of the appliance; and a second conductive surface disposed substantially in a second geometrical surface substantially coinciding with the first geometrical surface and situated in the inside space, and forming a radiating assembly connectable to the antenna feed conductor; whereby the antenna is semi-independent of the elements of the appliance.

Abstract: An on-board antenna comprising a radiation element provided on a dielectric substrate, a grounding conductor surrounding a periphery of an outer edge portion of the radiation element at a position spaced away outwardly from the outer edge portion, a substantially box-shaped reflecting member including an opening thereof. The opening of the reflecting member is closed by the surface of the dielectric substrate so as to face the radiation element, and a conductive member is provided at least partially on an inner surface of the reflecting member.

Abstract: An antenna has a conductive bottom member; a conductive side member; and a conductive member arranged in a space surrounded by the bottom member and the side member, wherein the conductive member is connected to a signal line for transmission and/or reception.

Abstract: An antenna having an antenna cup and a helical element mounted in the antenna cup. The antenna cup has a side wall extending from a base thereof towards an open end thereof, the side wall having a plurality of slots formed therein, a first set of the slots being arranged parallel to a longitudinal axis of the helical element and a second set of the slots being arranged perpendicular to the longitudinal axis of the helical element, the first set of slots being arranged to surround an upper portion of the helical element and the second set of slots being arranged to surround a lower portion of the helical element. The slots present a high impedance wall to surface currents and thereby significantly reduce side lobe radiation. Such an antenna is particular useful in antenna co-location applications, such as cellular telephone and Wi-Fi applications.

Abstract: The present invention provides an antenna unit that eliminates the need for an EMI shield to protect the sensitive components of the antenna unit's circuit board from EMI. The antenna unit includes a planar member composed of a material operating as a ground plane for the antenna unit, the ground plane defining a cavity; a circuit board secured to the ground plane, the circuit board including a platform and at least one circuit board component, the platform covering the cavity so as to enclose the circuit board component within the cavity, and an antenna positioned adjacent to the platform and in communication with the circuit board.

Abstract: An apparatus mounted beneath or behind a surface and being operable to transmit or receive wireless communication signals for transmitting information from one location to a remote location. The apparatus includes an antenna mounted substantially flush with a surface. The apparatus also includes a communication device and a matching network having a radial transmission line. The communication device is connected to the antenna via the matching network and includes either a transmitter, a receiver or a transceiver.

Abstract: An antenna (100) includes an antenna radiating element (108) that is at least partially comprised of a conductive fluid (104). A dielectric structure (102) defines at least one cavity (110A, 110B) for constraining the conductive fluid. The antenna also includes a fluid control system (116A, 116B, 118A, 118B, 120A, 120B, 122) for selectively adding and removing the conductive fluid from the cavity for controlling a dimension of the antenna radiating element (108). The antenna radiating element (108) can be comprised of a plurality of cavities (110A, 110B), with each cavity defining a segment of the antenna radiating element (108).

Abstract: A top conductor 11, a ground conductor 12, and side conductors 13 form an antenna box having two openings 22 and 23. Antenna elements 14 and 15 are placed inside of the antenna box, and are connected to power supply points 16 and 17, respectively. A power supply control circuit 20 has a switching function of connecting either one of the power supply points 16 and 17, to an external connecting terminal 21. Depending on the antenna element 14 or 15 being operated, the antenna has a directivity biased to a desired direction. The power supply control circuit 20 may have a signal combining/separating function, a phase shifter 26, or an amplitude adjusting circuit 27. With this, it is possible to provide a small, slim antenna capable of biasing the directivity to a desired direction and controlling the directivity even after installation.

Abstract: A cavity-backed wideband slimline flat panel antenna array for providing a steerable beam includes an array of slot antennas, each of which fed by its own individual dipole radiator, with the wide bandwidth being due to the matching impedances of the slot antenna and dipole radiator across the entire frequency band. In one embodiment, an upstanding printed circuit balun feed is connected to each dipole. The dipole elements are located to either side of a slot, and are arrayed on the underneath side of a dielectric layer under the substrate into which the slots are formed, with the dipole elements directly fed by individual upstanding printed circuit baluns which are arrayed beneath the individual slots antennas. The use of the dipole elements, in addition to providing a wider operational bandwidth, also permits feeding each of the slots without having to use striplines which would have to cross each other and therefore not work.

Abstract: An antenna for receiving electromagnetic waves, the antenna including a resonator having an electrically conductive bottom, an electrically conductive top, and an electrically nonconductive section between an electrically conductive side wall and the electrically conductive top. The electrically conductive bottom being in electrical contact with the electrically conductive side wall, which extends from the electrically conductive bottom to a grounding surface. The resonator having a dielectric disposed in an interior volume.

Abstract: Low cost antennas and electromagnetic absorbing parts formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises conductive fibers, conductive powders, or in combination thereof in a resin base host wherein the ratio of the weight of the conductor fibers, conductor powders, or combination of conductor fibers and conductor powders to the weight of the base resin host is between about 0.20 and 0.40. The conductive fibers or conductive powders can be stainless steel, nickel, copper, silver, carbon, graphite, plated fibers or particles, or the like. The antenna elements can be formed using methods such as injection molding or extrusion. Virtually any antenna, ground planes, or shielding packages fabricated by conventional means of metal can be fabricated using the conductive loaded resin-based materials.

Abstract: An apparatus mounted beneath or behind a surface and being operable to transmit or receive wireless communication signals for transmitting information from one location to a remote location. The apparatus includes an antenna mounted substantially flush with a surface. The apparatus also includes a communication device and a matching network having a radial transmission line. The communication device is connected to the antenna via the matching network and includes either a transmitter, a receiver or a transceiver.

Abstract: A broad band communications antenna includes a baseplate which has a conductive layer that includes at least one coupler opening. A stripline network is provided adjacent the conductive layer in the region of the coupler openings. At least one conductive patch is arranged opposite the baseplate. The baseplate and the patch are arranged in a conductive housing which is provided with an open side. The baseplate is arranged adjacent the bottom of the housing and therefore farthest from the open side. One or more lugs are provided on the open side of the housing for reducing the open cross-sectional surface of the housing when the open side is seen from above.

Abstract: A cavity-backed wideband slimline flat panel antenna array for providing a steerable beam includes an array of slot antennas, each of which fed by its own individual dipole radiator, with the wide bandwidth being due to the matching impedances of the slot antenna and dipole radiator across the entire frequency band. In one embodiment an upstanding printed circuit balun feed is connected to each dipole. The dipole elements are located to either side of a slot and are arrayed on the underneath side of a dielectric layer under the substrate into which the slots are formed, with the dipole elements directly fed by individual upstanding printed circuit baluns which are arrayed beneath the individual slots antennas. The use of the dipole elements, in addition to providing a wider operational bandwidth, also permits feeding each of the slots without having to use striplines which would have to cross each other and therefore not work.

Abstract: A planar antenna device comprises a ground plane, a planar antenna element having a principal plane mounted above the ground plane, and a cavity, having an opening partially exposing the antenna element, placed on the ground plane in order to cover the entire antenna element contactlessly.

Abstract: An antenna, has a box conductive case having at least a single opening on an upper part, an internal conductor which is stored in the case, is disposed at a bottom, and is shaped like a letter “” which is one of Japanese katakana letters, a letter “u”, a letter “U”, a cramp, or an arc, and a feeding element which is stored in the conductive case and is connected to a feeding section disposed on the bottom of the conductive case, wherein the internal conductor other than parts disposed on the conductive case is not connected to the case.

Abstract: A flush mounted installation unit in which an operating portion of the installation unit such as the supporting plate, the covering or switch unit is designed as an antenna so that the unit can perform the dual function of housing and mounting the components for use in a control system and providing an antenna for a radio link between the central control unit and the components.

Abstract: A directional antenna made with photonic band gap structures has been presented. The directional antenna is formed with two photonic band gap structures oriented back to back and separated from each other by a distance to form a resonant cavity between the photonic band gap structures. An antenna element is placed in the resonant cavity. The resonant frequency of the cavity is tuned by adjusting the distance between the photonic band gap structures. The resonant cavity can be asymmetrical or symmetrical.

Abstract: An antenna feed in a satellite system that provides substantially equal E-plane and H-plane patterns. The feed includes outer and inner conductive walls that are coaxial, and define an outer waveguide therebetween and an inner waveguide within the inner conductive wall. The feed includes a first cylindrical waveguide section, a tapered waveguide section, and a second cylindrical waveguide section at the aperture of the feed. Downlink signals are in signal communication with the first cylindrical waveguide section so that the downlink signals are launched into the outer waveguide and out of the feed. Uplink signals received by the inner waveguide are directed to suitable uplink reception devices. One or both of the outer or inner conductive walls include an array of radially disposed iris pins at the aperture that interact with the uplink and/or downlink signals to provide beam symmetry or equal E-plane and H-plane patterns.

Abstract: The spiral sheet antenna allows a small efficient antenna structure that is much smaller than the electromagnetic wavelength. It achieves the small size by introducing a high effective dielectric constant through geometry rather than through a special high dielectric constant material. It typically includes a rectangular cylinder-like shape, with a seam. The edges of the seam can overlap to make a high capacitance, or they can make a high capacitance by simply having the edges of the seam very close to each other. The high capacitance serves the same role as a high dielectric constant material in a conventional compact antenna.

Abstract: The invention provides a flexible electrode antenna having a layer of conductive material laminated between a layer of flame retardant material and a layer of protective material. The layer of conductive material is preferably a metalized polymer substrate having corrosion resistant properties. The flame retardant material is preferably a glass cloth, while the protective material is preferably a non-woven material.

Abstract: The invention relates to a broad band communications antenna that is provided with a base plate which is provided with a conductive layer (14) that is provided with at least one coupler opening. A strip line network (15) is provided at a little distance from the conductive layer (14) in the region of the coupler openings. At least one conductive patch (16, 17) is arranged opposite the base plate (13). The base plate (13) and the patch (16, 17) are arranged in a conductive housing (2) which is provided with an open side (19). The base plate is arranged closest to the bottom (3) of the housing and therefore farthest from the open side (19). One or more link/s (5) is/are provided on the open side (19) of the housing (2). Said links reduce/s the open cross-sectional surface of the housing (2) when the open side (19) is seen from above.

Abstract: An antenna is provided having a relatively simple structure as arranged capable of operating at desired frequencies. The antenna has a chassis having a grounding conductor provided as a bottom surface, a ceiling conductor provided as a top surface opposite to the grounding conductor, and side conductors provided as antenna sides. At least one opening is provided in a part of said chassis, which opens for radiation of electric waves. A feeding point provided on the grounding conductor for connection to a power supply via a predetermined feeding line from the outside. An antenna element connected to the feeding point at one end while being connected to the ceiling conductor via a frequency selectable circuit at the other end, and surrounded by the side conductors.

Abstract: The ground conductor, the side conductor, and the ceiling conductor surround the antenna element, which is connected to the coaxial power supply part arranged on the surface of the ground conductor. The ceiling conductor is arranged to face the ground conductor with the antenna element therebetween. The ceiling conductor is provided with an opening whose size, shape, and position are changed to vary the directivity of radio waves.

Abstract: Disclosed is a radio wave marker reception antenna which is not easily affected by disturbance noises, such as a broadcast wave, which are set to the same frequency band as the radio wave signal conveying driving assisting information. The radio wave marker reception antenna is equipped with a cover which is formed of a conductive material and which has a prism-like, cylindrical, conical, dome-shaped, or forwardly broadening configuration. The cover may be installed such that it is inclined from the position where its lower side is oriented vertically downward to a position where its lower side is directed obliquely forward. Further, the interior of the cover may be filled with a non-conductive material.

Abstract: An antenna is provided having a relatively simple structure as arranged capable of operating at desired frequencies.

Abstract: An antenna has a conductive bottom member;

Abstract: A planar antenna device comprises a ground plane, a planar antenna element having a principal plane mounted above the ground plane, and a cavity, having an opening partially exposing the antenna element, placed on the ground plane in order to cover the entire antenna element contactlessly.

Abstract: A coaxial cavity antenna including a cylindrical inner conductor sized for propagation of electromagnetic signals in a preselected frequency range. The coaxial antenna also includes a cylindrical outer conductor positioned coaxial with the inner conductor, and having a diameter larger than the inner conductor. The outer conductor has an aperture ring disposed at an end of the outer conductor. The outer conductor is positioned with respect to the inner conductor to form a cavity between the inner conductor and the outer conductor. The cavity is sized for propagating electromagnetic signals in the preselected frequency range. The coaxial cavity antenna also includes a plurality of aperture teeth radially oriented and disposed around the aperture ring, and an iris ring positioned inside the cavity at a predetermined distance from the aperture ring.

Abstract: A directional antenna designed to reduce the occurrence of side lobes, thus reducing the possibility of interference with other radio frequencies is disclosed. The directional antenna includes an antenna member and a reflecting tube. The reflective tube is sleeved over the antenna member. The reflective serves to block unwanted radial side lobes. The directional antenna can also include provisions that assist in suspending the antenna member within the reflective tube. A method for making the directional antenna is also described.

Abstract: An antenna comprising a substrate and a folded radiating element. The folded radiating element and the substrate define a resonant cavity which produces a wide beamwidth, and substantially hemispherical radiation pattern. An antenna constructed in accordance with the present invention can be incorporated into a transceiver system. The radiation pattern produced by the antenna is suitable for use in wireless communication systems operating in the PCS and DCS frequency ranges.

Abstract: An intentional radiator includes an antenna and a ground plane. The ground plane is to be coupled to shielding that includes an opening for the antenna wherein the intentional radiator is to be positioned such that the antenna radiates through the opening. The shielding and the ground plane together act to reduce emissions through the opening.

Abstract: A dielectric resonator antenna has a dielectric layer and a conducting layer formed on a main surface of the dielectric layer. An electrical contact is formed on the main surface for connecting the dielectric layer to a transmission line for transferring a signal between the dielectric layer and the transmission line. The electrical contact is insulated from the conducting layer. A conducting strip is connected to the electrical contact and is on a side surface of the dielectric layer. The side surface is not on the same plane of the main surface. Rather, the side surface is perpendicular to the main surface of the dielectric layer.

Abstract: An electromagnetic wave is transmitted from and received by an antenna system having a cavity member, a passive antenna element and a driver element. The cavity member has a back portion and a wall portion which define a substantially cylindrical interior portion. The antenna element has a first end disposed within the interior portion of the cavity member. The driver element is coupled to the interior portion of the cavity member.

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: An antenna system comprising a plurality of dipole elements and a single support formed from a single piece of material. The plurality of dipole elements is attached to a reflector plate and forms horizontally or vertically stacked radiation elements. Tabs centrally located between the support and the dipole elements are bent at an angle to form a symmetrical axis in the center of a slot formed by the plurality of dipole elements to attenuate the radiation caused by current flowing around the slot. The plurality of dipole elements are selected to achieve different radiation patterns and can be formed into different shapes to achieve different lobe shapes.

Abstract: The invention relates to a device for transmitting and receiving microwaves including a planar radiating element. The device is characterized in that the radiating element (60) has substantially orthogonal transmit and receive ports (68, 66) and the relative phase of the transmit and receive signals and the shape of the radiating element are such that the transmit and receive signals, whose frequencies are different, are circularly polarized in opposite directions.

Abstract: A cavity backed slot antenna comprises a conductive cavity, a conductive film carried by a thin dielectric substrate which is above the cavity. The conductive film includes one or more slots which an electric field is applied to radiate an electromagnetic energy.

Abstract: A low cost base station antenna for preventing insertion loss. In the antenna, a printed circuit board (PCB) has a power divider pattern including power divider terminals disposed on one side of the PCB. A conducting ground plate has therein rectangular apertures disposed in line as radiation elements respectively and electromagnetically coupled with each of the power divider terminals of the PCB and disposed to be separated from the PCB by a foamed dielectric sheet with a predetermined thickness so as to be insulated with respect to the power divider pattern. The power divider terminals of the PCB are disposed to terminate within the contour of the apertures and all the power divider terminals are disposed in one line and have a length being a quarter of wavelength. A cavity has a rectangular box with one side open and connected by its open side and by its edges to the ground plate so that all the apertures are disposed within contour of the capacity.

Abstract: A conformable, integrated antenna assembly providing three or more radiating apertures in a single antenna structure is provided. The antenna assembly is adapted to mount flush with the fuselage or other surface of an aircraft or other structure. A range of antenna services, including communications, navigation and IFF (CNI) services, may thus be provided while simultaneously minimizing aerodynamic drag and reducing size, weight and cost.

Abstract: Sensors positioned in power transmission systems with tubular enclosures have radio interrogation capabilities. The radio antenna assigned to a sensor is a planar antenna with a radiating element and a conductive baseplate, with the radiating element being designed as a reed that is provided in a self-supporting manner in a recess in the baseplate and is short-circuited to the baseplate at one end. This forms a quarter-wave antenna which can be tuned by using a metal resonating member with a U-shaped cross-section and can be combined with a surface-wave sensor.

Abstract: A feed circuit connects an antenna to a communications circuit to achieve an increased operating bandwidth. The feed circuit includes a folded balun having a balanced port configured to connect the antenna and an unbalanced port configured to connect to the communications circuit. In addition, a resonating capacitance is connected across the balanced port of the folded balun. The resonating capacitance has a value that provides resonance with an inductance of the balun in such a way that the operating bandwidth of the combined feed circuit and antenna is increased.

Abstract: A device for and/or comprised in antennas, in particular microwave antennas such as microstrip antennas, for controlling the antenna lobe and completely or partially suppressing cross-coupling between the polarizations in dual-polarized antenna elements. A metal frame, the sides of which can be angled for a desired lobe width, is positioned around each antenna element on top of the ground plane of the antenna. The shape and positioning of the metal frame around the antenna element also control the antenna lobe. In this way, the antenna lobe can be controlled in the desired manner irrespective of the size of the ground plane of the antenna, which depends, for example, on a desired microstrip distribution network for the antenna.

Abstract: An antenna includes a radiating resonant member for transmitting polarized microwaves. A first diffracting system radiates waves at an angle greater than the transmission angle of the radiating member. A second diffracting system corrects the purity of polarization of the waves for some directions at least.