Abstract: An accessory for a user equipment (UE) includes a housing and a near field communication (NFC) circuit. The housing is slid on the UE to become attached in a stored position relative to the UE. The NFC circuit is attached at a location on the housing and configured to become powered by inductive coupling to signals emitted by another NFC circuit within the UE to temporarily operate to transmit data to the other NFC circuit within the UE as the accessory NFC circuit passes over the other UE NFC circuit while the housing is being slid on the UE before reaching the stored position relative to the UE. While the housing is in the stored position relative to the UE, the NFC circuit may be configured to be inhibited from transmitting data to the other NFC circuit within the UE irrespective of whether the other NFC circuit within the UE is emitting signals to attempt to provide inductive coupling to the NFC circuit.

Abstract: A conveyor system for processing items on which radio frequency identification tags are disposed has a conveyor that conveys items through a path of travel, and an antenna disposed proximate the path of travel. Circuitry in communication with the antenna may associate RFID tag data with a package on the conveyor based on a difference signal from elements in the antenna.

Abstract: A mobile wireless communications device includes a portable housing, an NFC transceiver carried by the portable housing, and an antenna assembly coupled to the NFC transceiver and comprising a plurality of loop antennas connected in parallel, and progressively increasing in size from an innermost loop antenna to an outermost loop antenna.

Abstract: A transmission/reception antenna and a transmission/reception device using the antenna wherein the antenna includes a dielectric base board, an excitation loop antenna provided on the dielectric base board, a transmission/reception loop antenna provided on the dielectric base board in close proximity of but not in contact with the excitation loop antenna, and a resonance capacitor connected between two ends of the transmission/reception loop antenna. A coupling capacitor is connected to one of the two ends of the transmission/reception loop antenna. The excitation loop antenna is connected to a transmitter, and the transmission/reception loop antenna is connected to the receptor via the coupling capacitor. Thereby, the frequency property may be expanded without increasing the power consumption, and the reception processing unit is enabled to properly process the reception signal.

Abstract: A dual polarization current loop radiator realized with a via, probe, or exposed coaxial feed using part of a vertical metal structure of the radiator to guide current to a feed point of a horizontal metal plate capacitively coupled to the vertical metal structure is described. The vertical metal structure may be either stamped and attached to the ground plane or it can be formed along with metal backplane structure of the radiator. The top of the vertical metal piece is separated from the horizontal metal plate by a predetermined distance dielectric spacing. The spacing may be realized either a thin dielectric core or a non-conductive adhesive material.

Abstract: A multi-band antenna array for use in wireless communication devices with up to three simultaneous operating modes with improved antenna efficiency and reduced antenna coupling across a broad range of operative frequency bands with reduced physical size is described. The multi-band antenna array includes at least two loop antenna elements, each of which is orthogonal to, and arranged in an embedded manner, relative to each other. Each loop antenna in the multi-band antenna array may include a corresponding tuning element for tuning to a desired resonant frequency, and be comprised of an upper and lower half with the corresponding tuning element coupled therebetween.

Abstract: The present invention is a compact directional receiving antenna utilizing true-time-delay methods to achieve a wide pattern bandwidth and small real estate footprint. In one embodiment, two right-triangular-shaped loops are positioned in mirrored relation, one to another, with less than 1/100 wavelength spacing. In another embodiment, two of these pairs of loops are positioned in an orthogonal manner to form an electronically rotatable antenna array. In yet another embodiment, a single loop is provided with a pair of spaced couplers. Finally, in another embodiment, a pair of single loops is arranged in orthogonal relation to form an electronically rotatable array.

Abstract: Provided are a transmission/reception antenna and a transmission/reception device using the same wherein the transmission/reception antenna comprises a dielectric base board (11), an excitation loop antenna (12) provided on the dielectric base board, a transmission/reception loop antenna (13) provided on the dielectric base board in close proximity of but not in contact with the excitation loop antenna, and a resonance capacitor (14) connected between two ends of the transmission/reception loop antenna. A coupling capacitor (19) is connected to one of the two ends of the transmission/reception loop antenna. The excitation loop antenna is connected to a transmission processing unit, and the transmission/reception loop antenna is connected to the reception processing unit via the coupling capacitor. Thereby, the frequency property may be expanded without increasing the power consumption, and the reception processing unit is enabled to properly process the reception signal.

Abstract: An antenna element is disclosed. A substrate is made of dielectric material and has a first face. A first antenna element is made of conductive material and is provided on the first face. A first power feeding portion is made of conductive material and is disposed on the first antenna element. A second antenna element is made of conductive material, is provided on the first face, and forms a loop surrounding the first antenna element with a gap. A second power feeding portion is made of conductive material. The second power feeding portion is extended from the second antenna element toward the first antenna element and is arranged to form an electromagnetic coupling with the first antenna element. A perturbation element is made of conductive material and is extended from the second antenna element. A length of loop is twice a circumferential length of the first antenna element.

Abstract: A magnetic and/or magneto-electric antenna that has a plurality of conducting loops where each individual loop can be resonated at a frequency that is offset from the frequency of the other loops to provide a composite band-pass response that is broader than that of the individual loops. A receiving circuit acts to sum the signals from each of the antennas to provide a combined frequency response that is broader in bandwidth than any of the individual loops. Similarly a combination of multiple transmitter loops where a transmit circuit drives a common transmit waveform to each of the combined antennas to provide a combined transmitter frequency response that is broader in bandwidth than any of the individual loops.

Abstract: A microstrip antenna that can be linear, co-circular, or dual-circularly polarized having co-planar radiating elements and operating at dual frequency bands wherein an inner radiating element is surrounded by and spaced from an outer radiating element. Each radiating element resonates at a different frequency. In one embodiment of the invention a feed network has a single, cross-shaped, feed line that is positioned between the inner and outer radiating elements and capacitively coupled to the inner and outer radiating elements. In another embodiment of the present invention, the radiating elements are fed separately by first and second feed networks each having a plurality of feed points. The radiating elements each have one active feed point that is either directly or indirectly coupled to its respective feed network.

Abstract: An identification system which may be employed in a transport or monitoring system has at least one stationary and at least one mobile transmission unit which are each provided with an antenna, which antennas in turn are coupled inductively or capacitively to each other during the transmission of data. At least one of the antennas is designed such that in response to a mutual displacement of the coupled antennas a direction-dependent modulation of the transmitted signals occurs which is demodulated and evaluated in at least one of the transmission units, for example, by a demodulation unit and a processor, optionally a signal processor, in order to obtain information relating to the relative motion of the two transmission units. In addition to known identification functions, the identification system may perform additional important functions without requiring any significant additional expense.

Abstract: An antenna for reception of satellite radio signals emitted circularly in the direction of rotation of polarization has a conductive base surface, an antenna connection point, an antenna element connection point and at least two antenna elements. The first antenna element is a loop antenna formed as a conductor loop disposed substantially parallel but spaced apart from the base surface. The loop antenna has a plurality of capacitors disposed along the conductor loop. The antenna connection point is coupled to at least one interruption of the loop antenna. This connection point is configured to feed a ring current into the loop antenna. There is also at least one additional antenna element extending between the antenna element connection point and the loop antenna.

Abstract: The present invention relates to a wireless communication device, such as a transponder, that has a plurality of antennas for multi-frequency usage. The wireless communication device comprises a control system, communication electronics, memory, and the aforementioned antennas. A wireless communication device having a pole antenna may be used with one or more loop conductor antennas to achieve the desired operating frequencies. A wireless communication device having a dipole antenna may be coupled across a loop conductor antenna to provide different loop conductor configurations depending on the frequency.

Abstract: A mobile electronic device, such as a smart personal object includes an antenna system for emitting and receiving signals. The antenna system includes at least two antennas electrically connected in parallel to define an equivalent circuit having a reduced inductance with a substantially unaffected induced voltage for the equivalent circuit.

Abstract: A gate antenna device has a plurality of loop antennas which supplies power and transmission data to an IC-integrated medium through electromagnetic induction and acquires reception data in the form of a fluctuation of a load from the IC-integrated medium. The plurality of loop antennas include a power-fed loop antenna to which a signal current is supplied and a non-power-fed loop antenna to which no signal current is supplied. The gate antenna device expands the distance and range of communication with an IC-integrated medium and improves the accuracy of communication while suppressing power consumption and leakage electric fields.

Abstract: A reflector array antenna is divided into independent subarrays each comprising at least two radiating elements adapted firstly to collect signals delivered by a source and having at least one chosen first polarization and secondly to send phase-shifted signals having at least one chosen second polarization orthogonal to the first polarization. Each subarray sums the collected signals as a function of a chosen first phase law so that they correspond to a chosen source pointing direction, applies a chosen phase shift to the summed signals, and distributes the phase-shifted signals between the radiating elements as a function of a chosen second phase law so that the radiating elements of each subarray radiate them in a pointing direction of a chosen area. The combining and distribution are effected separately and the subarrays are therefore of a nonreciprocal type.

Abstract: The present invention relates to a wireless communication device, such as a transponder, that has a plurality of antennas for multi-frequency usage. The wireless communication device comprises a control system, communication electronics, memory, and the aforementioned antennas. A wireless communication device having a pole antenna may be used with one or more loop conductor antennas to achieve the desired operating frequencies. A wireless communication device having a dipole antenna may be coupled across a loop conductor antenna to provide different loop conductor configurations depending on the frequency.

Abstract: A communication station for contactless communication with suitably formed data carriers has an antenna configuration which has at least one antenna with at least one pole and at least one antenna with at least one essentially closed loop, and where the antenna with at least one pole is loosely electromagnetically coupled with the antenna with at least one essentially closed loop.

Abstract: A noncontact IC card is provided with a card substrate 11, an IC chip 12 disposed on the card substrate 11, and a antenna circuit 13 formed on the card substrate 11 and having a pair of antenna terminals 13a and 13b, where one antenna terminal 13a is connected to the IC chip 12. An isolation layer 14 is formed over at least one portion of the antenna circuit 13, and a connection layer 15 is formed extending over the isolation layer 14. One end portion 15a of the connection layer 15 is connected to the IC chip 12 and another end portion 15b thereof is connected to the other antenna terminal 13b of the antenna circuit 13. Protective layers 16a and 16b are provided on top of the card substrate 11 to protect the IC chip 12 and the antenna circuit 13.

Abstract: A phased array antenna (12) that includes a plurality of multiple spiral arm antenna elements (10). The antenna elements (10) are hexagonal in shape and are aligned in a triangular lattice geometry, where the elements (10) are arranged in rings around a common center element (32). The elements (10) include at least two arms (18, 20) which terminate at opposite sides of the element (10). The ends (26, 28) of the arms (18, 20) of diagonally adjacent elements (10) are positioned proximate to each other to provide inter-element coupling to increase the bandwidth of the antenna (12). The tight coupling of the antenna elements (10) also reduces the RCS of the antenna (12).

Abstract: An external antenna device for receiving short-wave broadcasts includes an antenna circuit section consisting of a tuner in which a loop antenna element and a variable-capacity diode are high-frequency-connected to each other in parallel, and a high-frequency amplifier supplied with receive signals selected by the tuner; a first cable for connecting the antenna circuit section to a control unit; a control voltage forming circuit for generating a control voltage for the variable-capacity diode provided in the control unit, and a power source for the antenna circuit section and the control voltage forming circuit; wherein a voltage from the power source and the control voltage are supplied to the antenna circuit section via the first cable and, at the same time, a second cable for supplying a short-wave receiver with signals resulting from the passage of the output signals of the high-frequency amplifier through the first cable and control unit is provided between the control unit and the short-wave receiver

Abstract: A multi-band low-profile antenna includes a conductive ground-plane element; a first radiator element mounted on the ground-plane element to define a first vertical loop; a second radiator element mounted on the ground-plane element to define a second vertical loop; and a coupling element mounted on the ground-plane element to define a vertical coupling loop, with one end portion of the coupling element being connected to a feed terminal. In at least one embodiment, the first radiator element and the second radiator element are of such dimensions and are so disposed as to be parasitically coupled to each other, to cause the first radiator element to resonate at a first predetermined VHF frequency and to cause the second radiator element to resonate at a second predetermined VHF frequency.

Abstract: A novel magnetic crossed loop antenna system is provided for use with radio navigation signals, such as provided by two or more Loran-C transmitters, and in which each loop antenna is rapidly switched between the receiving channel and that of the other loop-antenna to enable the selection of one channel with the strongest signals from both transmitters, and through tuning the antenna to the Loran-C frequency and providing rate compensation and feedback to the antenna, optimum signal-to-noise ratio, sufficiently wide bandwidth to ensure time delay stability and attenuated amplifier noise are achieved, enabling greatly improved location and tracking.

Abstract: An antenna having an omnidirectional pattern in azimuth and coverage throughout a hemisphere. The radiating elements are four half-loops mounted on a ground plane. Each half-loop is approximately one-half wavelength in length with one end grounded to the ground plane and the other end fed in opposition to the ground plane. The image produced by the ground plane of each half-loop, together with the actual half-loops give the effect of a set of four complete loops, each of which complete loops is approximately one wavelength in circumference. The elements are nominally located in planes normal to the ground plane that pass through a central point in the ground plane. The planes of the elements are oriented nominally at 90 degree intervals about a central point and the centers of the elements are offset from the central point of the ground plane by approximately one-quarter wavelength. The combination of elements produces an omnidirection radiation pattern in azimuth.

Abstract: A self-contained system containing an antenna, a circuit board, and a power source. The antenna consists of two loop elements mounted perpendicular to each other on a circular metal plate that acts both as part of the radiating system and as a shield between the circuitry and the radiator. The circuit board includes a transmitter, a receiver, and other circuitry for storing information and executing software. The antenna has a high gain, is omnidirectional in two orthogonal polarizations, and has a high degree of isolation between the two loop elements. To achieve omnidirectionality, in one mode, the antenna operates by using each loop element in a time-sequence of brief on/off states. In another mode, the transceiver uses both loop elements simultaneously with the signals on the two loop elements in phase quadrature.

Abstract: A dual loop antenna (100) provides a dual frequency band response. The dual loop antenna (100) is configured on a substrate (102) which includes first and second radiator elements (106, 206) coupled through a common feed element (108).

Abstract: An antenna system for a communication receiver comprising a first circuit portion located on a first circuit substrate, and a second circuit portion located on a second circuit substrate comprises an antenna which is located on the first circuit substrate and at least one circuit element of the second circuit portion being positioned in proximity to the antenna to effect interaction with the antenna. A loss cancellation element comprises a conductive sheet metal element and an insulating material enclosing the conductive sheet metal element. The loss cancellation element is affixed with an adhesive to the second circuit substrate and interposed between the antenna and the interacting circuit element to reduce the interaction between the antenna and the circuit element.

Abstract: A miniature antenna, in which a pair of square conductor plates disposed in parallel with a spacing sufficiently smaller than the wavelength used are fixed to each other to an insulating frame to form an antenna structure which is used also as a case. Feeding terminals are provided at a desired position on one side of each of the conductor plates. High-frequency-wise short-circuit elements are provided at a plurality of positions on other sides of the conductor plates. A gravity-direction sensor, which produces an output in accordance with the direction of gravity, is provided in the case. The plurality of short-circuit elements are selectively short-circuited by the output of the gravity-direction sensor so that the plane of polarization of the antenna is brought into agreement with the direction of gravity.

Abstract: An integral portable receiver/antenna system is provided which includes an isolation coupler element exhibiting a geometry which is substantially closed upon itself and which is situated between the receiver antenna and the input of the receiver. A portion of the antenna element is distributively coupled to a portion of the coupler element. The receiver/antenna system further includes a ground plane which is sufficiently close to a portion of the coupler element such that the ground plane is distributively coupled to the coupler element. The coupler element prevents the formation of undesired signal loss paths between the antenna and the receiver and provides for impedance matching the input of the receiver to the antenna. The coupler element also couples signals to the receiver input which would otherwise be lost to the ground plane.

Abstract: A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved means for generating and applying a reference signal used in phase detection.

Abstract: The present invention provides a vehicle antenna system including high frequency pickup type antennas concealed within the vehicle body for receiving broadcast waves. The high frequency pickups are arranged on the vehicle body at locations spaced apart from one another, that is, at least one adjacent to the vehicle roof and the other on a trunk hinge. The antenna system also includes a diversity circuit for automatically selecting one of the high frequency pickups which is in its optimum state of reception. Each of the high frequency pickups is disposed near the marginal portion of the vehicle body such that surface high frequency currents concentratedly induced on the marginal portion of the vehicle body can be detected by the high frequency pickup. Each of the high frequency pickups includes a loop antenna or electrostatic electrode disposed near the marginal portion of the vehicle body.

Abstract: A resonant antenna suitable for transmission and for reception over a broad range of frequencies combines electric and magnetic multipoles generated by linear and loop elements respectively. The minimum requirement is one electric and one magnetic dipole and one electric and magnetic quadrupole. The electric elements are driven in time quadrature with the magnetic elements. The elements of the minimum requirement lie in the same plane and along the same axis. The minimum number of elements for a free standing antenna is three loops and three dipoles. Maximum transmission and reception occur only in the same direction along the axis. The size of the antenna is reduced by introducing a ground conductor or plane along the antenna axis and eliminating the half elements on one side thereof and is further reduced by introducing a second ground plane normal to the first at the midpoint of its length and eliminating the quarter elements on one side.

Abstract: A receiving antenna for use in proximity to an antenna having a circular radiating magnetic field includes at least one antenna having a null spatial sensitivity pattern along at least one axis, oriented with the circular radiating antenna located in said null pattern. In a preferred embodiment, the antenna having spatial sensitivity is three orthogonally oriented loop antennas, arranged to be insensitive to signals from the circular radiating antenna and sensitive to TE and TM signals from a remote location.

Abstract: A broadband multi-element antenna is presented. The antenna comprises a monopole centrally disposed within a cavity of the body, and a plurality of antenna elements disposed at ninety degree increments about the periphery of the cavity. A plurality of isolation traps are connected between selected pairs of the antenna elements. The isolation traps are half-wavelength transmission lines which permit excitation of the respective plurality of elements by input signals which are of equal amplitude and 180.degree. out-of-phase but are short circuits between the respective pairs for in phase signals parasitically induced from the monopole. Additionally, switching traps are connected to respective ones of the antenna elements. The switching traps comprise quarter-wave transmission lines which are switchable to ground and selectively provide a short circuit of signals at the respective ones of the elements for changing the radiation pattern of the antenna.

Abstract: A multimode loop antenna arrangement for generating various radiation/reception patterns, the loop comprises a plurality of peripheral gaps which are fed through hybrid networks or the like for the production of specialized patterns, such as cardioid, mutually orthogonal dipole modes, and combination modes, such as the so-called turnstile configuration. The antenna is basically non-resonant unless separately tuned and is most useful where broadband operation and minimal size and weight are important.