Abstract: A signal receiving station for an ADS-B surveillance system used in air traffic control includes a housing to be attached to a mast. The housing includes an ADS-B signal receiving antenna, a GPS signal receiving antenna, and an electronic module for receiving and processing ADS-B signals and GPS signals. The ADS-B signal receiving antenna and GPS signal receiving antenna are connected to the electronic receiving and processing module inside the housing.

Abstract: A radio frequency identifier (RFID) tag can comprise an RFID chip, an antenna provided by a patch cell stack; and a feed line electrically coupling the RFID chip to the antenna. An equivalent circuit for the patch cell stack can comprise at least one inductance group comprising at least two series inductances, and at least one shunt capacitance. The antenna can have a composite right- and left-handed (CRLH) structure.

Abstract: A three-dimensional multiple spiral antenna includes a substrate, a plurality of spiral antenna sections, and a feed point module. The substrate has a three-dimensional shaped region and each spiral antenna section is supported by a corresponding section of the three-dimensional shaped region and conforms to the corresponding section of the three-dimensional shaped region such that, collectively, the spiral antenna sections have an overall shape approximating a three-dimensional shape. The feed point module is coupled to a connection point of at least one of the spiral antenna sections.

Abstract: The dual polarised radiating element comprises four dipoles each comprising one stand and two arms. A first arm and a second arm belonging to two adjacent dipoles, form a straight radiating strand composed of a single part and the four radiating strands are arranged so as to form a disjoint square at the corners. The antenna comprises at least one first radiating element operating in a first frequency band and at least one second radiating element operating in a second frequency band and having at least one dipole that is arranged at the centre of the square formed by the radiating strands of the first radiating element, the radiating elements being arranged above a common reflector such that the transverse strands of the first radiating elements are located between two adjacent second radiating elements.

Abstract: A three-dimensional multiple spiral antenna includes a substrate, a plurality of spiral antenna sections, and a feed point module. The substrate has a three-dimensional shaped region and each spiral antenna section is supported by a corresponding section of the three-dimensional shaped region and conforms to the corresponding section of the three-dimensional shaped region such that, collectively, the spiral antenna sections have an overall shape approximating a three-dimensional shape. The feed point module is coupled to a connection point of at least one of the spiral antenna sections.

Abstract: Provided is a method for manufacturing an antenna which is minimized and used in a low frequency band. The method includes forming and preparing a radiator for an antenna, mounting the radiator inside a dam molding part including an upper dam molding part and a lower dam molding part, injecting a molding material into the dam molding part through an inlet provided at one side of the dam molding part, the molding material including a composite material with a controlled diameter and content, hardening the injected molding material, and separating the hardened molding material covering the radiator from the dam molding part. Accordingly, a miniaturized antenna can be provided, which can achieve a high integration density, prevent deformation of the radiator caused by external pressure generated in processes, and be used in a low frequency band by covering the radiator with a molding material having a high permittivity and a low-loss characteristic.

Abstract: A wireless IC device that is operable in a wide band and is suitable for RFID systems includes a radiating plate and an electromagnetically coupled module constituted by a wireless IC that processes transmitted/received signals and a feeding circuit board having a feeding circuit and coupled with the wireless IC. The radiating plate includes a linear electrode bent at a bent portion and apparently sectioned into two linear electrode portions having different lengths. The electromagnetically coupled module is arranged such that the feeding circuit board and the linear electrode portions are electromagnetically coupled. The wireless IC is operated by signals received by the radiating plate, and response signals from the wireless IC are radiated outward from the radiating plate.

Abstract: An antenna adapted for wireless networks and having a variably controlled stagger antenna array architecture is disclosed. The antenna array contains a plurality of driven radiating elements that are spatially arranged having each radiating element or element groups orthogonally movable relative to a main vertical axis so as to provide a controlled variation of the antenna array's azimuth radiation pattern.

Abstract: A module for receiving one or more electromagnetic waves moving along a path in a direction of propagation. The module includes a first electrically conductive strip disposed in a first pattern and a second substantially electrically conductive strip disposed in a second pattern. The first and second strips are positioned substantially parallel to each other and spaced apart, and are electrically connected to each other. The first and second patterns are substantially opposite to each other, so that current passing through the first and second strips generates respective electromagnetic fields which are substantially opposed to each other. The first strip is positionable in the path of the electromagnetic wave and substantially transverse to the direction of propagation, to provide a protected region from which said at least one electromagnetic wave is substantially excluded.

Abstract: There are disclosed methods of making RFID transponder webs and intermediate webs such as RFID strap webs and antenna webs, as well as such webs per se.

Abstract: An E-field probe comprises one or more dipoles, each comprising plural, parallel, strings of discrete resistors mounted on a section of printed circuit board and connected electrically so that the parallel strings are twisted about each other for optimum orientation symmetry and minimum stray field pick-up. The values of the individual resistors are chosen so that the dipole is essentially a tapered resistance dipole, providing good performance over a very broad range of frequencies. A pair of diodes connected respectively in parallel strings of one arm of the dipole allows the feeder to be constituted by a pair of parallel series of resistors of comparatively high resistance value continuing from the outer end of the arm in which the diodes are situated. The dipole is effectively “end fed” rather then center fed, and pattern distortion and axial asymmetry are minimized.

Abstract: Physically small quadrifilar helix antenna systems capable of providing a positive gain, quasi-hemispherical antenna pattern over a relatively broadband frequency range in the L-Band frequency band. The antenna systems according to the present invention generally comprise a quadrifilar helix antenna and at least one antenna feed network, and may further comprise matching means for improving the broadband frequency performance of the antenna. In a preferred embodiment, the elements of the quadrifilar helix antenna which form each bifilar helix are short-circuited at their distal ends, and energy is fed to and induced from the antenna via receive and transmit 90.degree. hybrid couplers which are electrically connected to the bifilar loops of the quadrifilar helix antenna.

Abstract: In a short wave transmission method, a carrier in a short wave band is circularly polarized and radiated from an antenna, thereby removing an influence of fading. A short wave transmission apparatus has a transmission apparatus including a carrier generation unit, a subcarrier generation unit, a first mixer, a phase shifter, a second mixer, and two orthogonal dipole antennas. The carrier generation unit generates a carrier in a short wave band. The subcarrier generation unit generates a subcarrier. The first mixer receives the carrier and the subcarrier. The phase shifter phase-shifts the subcarrier generated from the subcarrier generation unit by .pi./2. The second mixer receives the carrier and a subcarrier which is phase-shifted by .pi./2 by the phase shifter.

Abstract: A vehicle controller is presented for use in a remote keyless entry system for controlling a vehicle device function. The controller includes a receiver for receiving a RF request signal including a security code uniquely identifying a portable transmitter that is authorized entry into the vehicle and for controlling access to the vehicle when the received security code matches a prestored security code. A circuit board carries the receiver and a flat ground plane. A helical antenna is mounted on the circuit board and includes an elongated conductive member having one end electrically connected to the receiver means and an opposite free end. The conductive member is helically coiled about a helical axis intermediate the ends thereof with the helical axis being perpendicular to the ground plane. The antenna is configured to provide an omni-directional radiation pattern about the helical axis.

Abstract: A quadrifilar helix antenna according to the present invention incorporates four helix conductors wound around an axis in the same winding direction. Each of the helix conductors has a linear conductor which is parallel to its axis at either end or both ends of the helix conductor. The present antenna reduces the effect of multipath fading due to sea-surface reflection in mobile satellite communications.

Abstract: An omnidirectional antenna provides circular and elliptically polarized electromagnetic waves. The antenna constitutes first and second elements as the only radiating portions of the antenna. Each element has an elongated central portion parallel to each other, with ends bent at a predetermined slant angle above and below horizontal planes running through the central portions, and then with the ends themselves being at acute angles with respect to the central portion. The acute angles of the second element are in opposite orientation to the first. A proper balun is provided for driving the antenna.

Abstract: Improved performance of a stacked array of short helical elements is achieved by using average spacing between elements which is less than one wavelength. Still better performance is obtained by using as antenna elements structures comprising combinations of Z-shaped radiators.