Abstract: A wireless LAN antenna comprises a dielectric substrate having a first surface and a second surface. The first surface of the dielectric substrate has a rectangular loop. A rectangular grounding copper foil is adhered within the rectangular loop. A signal feeding copper foil is further included. One end of the signal feeding copper foil is connected to the rectangular loop and the grounding copper foil, while another end of the signal feeding copper foil running across another end of the rectangular loop. Moreover, a layer of back surface copper foil is plated to the back side of the printed circuit board. This back surface copper foil covers one half of the loop on the front surface. Adjustment of the transversal dimensions of the grounding copper foil will impedance-match the antenna to the feeding structure of the antenna.

Abstract: An antenna mount for supporting a whip antenna on a ground vehicle has an upper part and a lower part, the upper part supports the whip antenna and has an upper mounting ring and the lower part extends through an outer shell of the vehicle has a lower mounting ring, one or more intermediate rings are disposed between the upper ring and the lower ring and incorporate a cavity for containing a GPS antenna.

Abstract: An antenna device including a loop antenna main body having a predetermined aperture area, and a conductor element insulated from the loop antenna main body, connected to a ground potential, and formed in parallel with the loop antenna main body.

Abstract: An earthing conductor is disposed on the reverse of a print board, and a signal process circuit section including a transmit-and-receive circuit is disposed on the right side of the board. A loading coil is mounted on the right side of the board across a print pattern of the signal process circuit section and a print pattern of an antenna. A vertical portion of the antenna projects from the print pattern of the antenna on the print board, and a horizontal portion of the antenna horizontally extends from a top end of the vertical portion in parallel with the print board.

Abstract: An electrically small broadband antenna comprises a plurality generalized contrawound toroidal helical antenna elements, each made from a single continuous conductor divided into two length portions each of which are substantially the same length and which have a generalized helical pattern, wherein the helical pitch senses the two length portions are opposite to one another, and the two length portions are insulated from one another and overlap one another on the surface of a generalized toroid. Each antenna element incorporates a signal coupler with an impedance matching network, wherein the first ports of the plurality of signal couplers are in proximate location to one another and are connected together to a common signal input port, and the second ports of the respective signal couplers are connected to the respective signal feed ports at the node locations where the respective length portions join one another, or at a diametrically opposite location.

Abstract: Identification tags (22) are secured to objects (20) moving upon a transport band (16). The identification tags (22) each contain a transponder circuit (32) in electrical communication with transponder antennae (30, 31). The transponder circuit (32) contains a unique digital code containing data relating to the object (20). When the identification tag (22) is located beneath the object (20), at least one reader antenna (25) is positioned beneath the transport band (16) and in alignment with a selected aperture (34) extending through a support plate (12). One or more apertures (34) in alignment with the reader antenna (25) provide capacitive coupling between the transponder antennae (30, 31) and the reader antenna (25). The reader circuit (28) generates a signal in the presence of an identification tag (22), which is transmitted to the transponder antenna (30) located on the identification tag (22).

Abstract: A method for increasing the interrogation range of an RF Tag in a radio communication system using RF Tags with two reflecting antenna elements. The second reflecting antenna element is predeterminately positioned, and preferably aligned, with respect to the first reflecting antenna element in the direction of expected incident RF radiation and is spaced from the first reflecting antenna element at a predetermined fixed distance. The first and second reflecting antenna elements are alternately pulsed on and off such that while the first reflecting antenna element is in a signal reflecting operating state, the second reflecting antenna element is in a substantially non-reflecting state and vice versa. The alternate pulsing and predetermined fixed spacing between the first and second elements generates a known phase difference between the reflected signals of the first and second reflecting antenna elements.

Abstract: In an electromagnetic antenna a continuous conductor comprises a first length portion and a second length portion, the first and second length portions each having a first end and a second end whereby the first end of the first length portion connected to the second end of the second length portion at a first node, and the second end of the first length portion is connected to the first end of the second length portion at a second node.

Abstract: A shielded magnetic-field antenna has at least one turn of a metallic element and metallic tubular shielding positioned around the element. The turn (3a) is produced in a printed circuit on a card made of insulating material (4a). The shielding has two open rings (5a, 6a) each produced in a printed circuit and disposed respectively on a bottom card (9a) and a top card (10a) made of insulating material. The cards are assembled by gripping the turn between the top and bottom cards. A plurality of metallic vias (7a, 8a) connect side edges of the two rings. The vias extend through the cards, and are positioned around the turn.

Abstract: An antenna is disclosed that has windings that are contrawound in segments on a toroid form and that have opposed currents on selected segments. An antenna is disclosed that has one or more insulated conductor circuits with windings that are contrawound around and over a multiply connected surface, such as a toroidal surface. The insulated conductor circuits may form one or more endless conductive paths around and over the multiply connected surface. The windings may have a helical pattern, poloidal peripheral pattern or may be constructed from a slotted conductor on the toroid. Poloidal loop winds are disclosed with a toroid hub on a toroid that has two plates that provides a capacitive feed to the loops, which are selectively connected to one of the plates. Associated methods are also disclosed.

Abstract: A low-profile antenna includes a ground-plane element defining a ground plane and an elongated radiator element configured and disposed in relation to the ground plane to define a vertical loop when the ground plane is horizontally disposed. A substantial broad segment of the radiator element is parallel to the ground plane. One end of the radiator element is connected to the ground-plane element and another end of the radiator element having spaced-apart legs with feet is capacitively coupled to the ground-plane element by dielectric spacing elements that are disposed between the feet of the radiator element and the ground-plane element. A conductive-material layer contacts the feet between the feet and the dielectric spacing element. An exposed portion of the conductive-material layer that extends from beneath the feet of the radiator element includes removal tabs for enabling the capacitive coupling to be adjusted by removing at least some of the exposed tabs.

Abstract: Small antennas for internal mounting within wireless communicators, such as radiotelephones, that can operate within multiple frequency bands, including low frequency bands are provided. A planar radiating element overlies a pair of adjacent, spaced-apart, substantially parallel conductive strips that are electrically connected to ground. The conductive strips are configured to parasitically couple with the radiating element. The planar radiating element includes a first meandering segment and a second meandering segment that is a mirror image of the first meandering segment. The first meandering segment includes a set of periodically spaced-apart planar undulations, such as U-shaped portions, and the second meandering segment includes a corresponding set of periodically spaced-apart planar undulations. The first and second meandering segments are connected together in opposing relationship therewith to form a continuous, conductive loop.

Abstract: A universal utility usage data gathering system that is capable of operating with any other read pad data gathering system, regardless of protocol. The universal system comprises of two components. One—a transponder which is the actual device that accumulates utility usage and will transfer accumulated usage to a reader/interrogator system. Two—the universal reader/interrogator, which will universally read any transponder for which the reader is programmed to accept from the transponder read pad. The universal reader/interrogator is based on standard micro-electronic chips and utilizes a multi-tapped antenna making the device capable of communicating with any transponder. The universal reader/interrogator will determine what protocol from any transponder.

Abstract: A rotating field antenna is provided which includes a figure eight shape loop, a center loop magnetically coupled to the figure eight shape loop, and a drive element for driving the figure eight loop. The figure eight shape loop has an upper loop, a lower loop and a crossover region therebetween. The center loop overlaps at least a portion of the crossover region and at least a portion of one or both of the upper and lower loops. The center loop has no direct or physical electrical connection to the offset figure eight shape loop. Magnetic induction produces a 90-degree phase difference between the phase of the figure eight loop and the phase of the center loop. The antenna thereby produces a rotating composite field when driven by the drive element. The figure eight loop and the center loop are coplanar. The drive element may be an amplified voltage source which has a fundamental frequency of about 13.

Abstract: A card assembly (10) comprises a polymeric layer (16) having a generally planar surface (24), an integrated circuit component (38) adjacent to the polymeric layer (16), and a loop antenna (24) formed of a bare conductor (32) having ends. The loop antenna (24) comprises a first section (26) embedded into the polymeric layer (16), a second section (28) embedded into the polymeric layer (16), and a transverse section (30) spaced apart from the first section (26) by a dielectric region. The transverse section (30) crosses the first section (26). The ends (34) are electrically coupled to the integrated circuit component (38). The dielectric region preferably comprises a reflowed flash region of the polymeric layer (16) such that the transverse section (30) is encapsulated within the polymeric layer (16). Alternately, the dielectric region comprises a dielectric insert separating the transverse section from the first section.

Abstract: Low impedance loop antennas utilize a loop separated into a plurality of radiating segments fed in parallel. A four point feed loop antenna, including radiating segments 12, 13, 14, 15 had a measured input impedance varying from 1.8 to 5.8 Ohms over a range of 5 to 15 MHz, without excessive radiation Q degradation. An incorporated feed network includes transmission line segments, with conductors on opposite surfaces of a thin substrate, connecting the radiating segments to a centrally mounted coaxial connector for parallel excitation. Operating bandwidth of the loop antenna is determined by the characteristic impedance of the transmission line feed segments. Low impedance loop antennas which are small relative to operating wavelength can be fabricated on a thin flexible substrate for field transport and use. Incorporation of the antenna into a jacket or other clothing enables field use while minimizing restriction of activity of the user.

Abstract: A key and lock system has a key with an integrated transponder coil that is connected to a transponder unit, and a lock with an integrated write/read coil. The key has a key bit portion and a bow portion. When the key bit portion is inserted into an elongated aperture of a key cylinder of the lock, an axis of the write/read coil forms an acute angle with an axis of the transponder coil. The acute angle substantially differs from a zero degree angle.

Abstract: A flat compact loop pattern provides an antenna for radio frequency identification tags with an enhanced voltage and/or current across two closely adjacently spaced terminals which are disposed on the same side of an insulating substrate. The amount of voltage supplied by the antenna loop to the RFID tag depends not only on the surface area included within the loop but also on the length of the planar loop or winding. The loop is comprised of a serpentine non-crossing wire disposed all on one side of the substrate, typically in the pattern of either a raster patterns in areas adjacent to one or more of the sides of the rectangular substrate, or a radial array of loops extending between the periphery and center of the substrate as the loops are azimuthally advanced around the center like spokes on a wheel or slices of pie.

Abstract: The present invention relates to a reliable transponder 3 for a tire and a reliable transponder-provided tire which are not broken while the tire runs or the tire is formed or cured, by using various metallic component members used in the tire as an antenna directly connected to the transponder 3 and thereby, further decreasing the transponder 3 in size. For example, by electrically directly connecting the transponder 3 with a conductive wire 131 or bead wire 161 in a jointless belt 13A set to the inner and outer peripheries of the tire, the wire 131 or bead wire 161 is used as the receiving and transmitting antenna of the transponder 3. Thereby, it is possible to decrease the transponder 3 in size and to increase the communication distance between an interrogator and the transponder 3 without increasing the transmission power of the interrogator.

Abstract: An antenna arrangement which is used for transmitting and receiving radio signals includes a capacitively tunable loop, from which received radio signals can be coupled symmetrically into a receiver stage, and which has a feed-in point, at which a signal to be radiated by the loop can be split into two signals moving in opposite directions to each other and with the same potential. Outcoupling of the received signals from the loop into the receiver stage can take place inductively via a coupling loop, or capactively via outcoupling capacitors, which are connected with the loop.

Abstract: An antenna apparatus for a mobile terminal is provided having a hula hoop antenna secured to a housing of the mobile terminal; a conductive line coupling the hula hoop antenna to a transceiver of the mobile terminal; a conductive fixing member having a through hole and contacting a portion of the hula hoop antenna; a cylindrical fixing member inserted into the through hole of the conductive fixing member; and a rod antenna extendable and retractable from and into the housing. The rod antenna is movable along a central axis of the cylindrical fixing member. The hula hoop antenna has a first end connected to a variable capacitor on a printed circuit board of the mobile terminal and a second end connected to a ground plate of the printed circuit board.

Abstract: An antenna system for a radio frequency ("RF") wireless keyboard includes a metallic plate as a part of the antenna system. The metallic plate is located within the wireless keyboard. A RF transmitter is coupled to the metallic plate and an antenna wire which form an the antenna loop. The antenna loop may also be directly integrated into the metallic plate by creating a cut-out space in the metallic plate. The antenna system may also include the metallic plate directly coupled with the RF transmitter so that the metallic plate is a whip or dipole antenna. The RF transmitter generates RF signals associated with particular keyswitches of the wireless keyboard. The antenna system transmits the generated RF signals to a RF receiver that resides separately from, and that communicates with, the wireless keyboard.

Abstract: A closed loop is formed by loop antenna elements which equivalently function as inductance, a capacitor inserted in such a manner as to divide the loop antenna into the loop antenna elements, and an impedance-matching dividing element for tuning the antenna and establishing matching with a high-frequency circuit side. A subsidiary substrate with the capacitor mounted thereon is fixedly installed by a retaining pawl of an antenna holder, and is connected to the loop antenna elements by being soldered thereto at a pair of lands on the subsidiary substrate. As a result, it is possible to improve the effective gain of the antenna and effectively utilize the substrate space.

Abstract: A data carrier system is provided including: a main apparatus including a first control unit for outputting a first signal and a first coil unit having at least a transmission coil for transmitting the first signal; a tuner circuit unit having a tuner circuit being tuned with the frequency of the first signal, the tuner circuit having a tuning coil disposed facing the transmission coil of the first coil unit; and a tag including a second coil unit having at least a reception coil and a second control unit for performing a predetermined control operation in accordance with the first signal transmitted from the main apparatus and received by the reception coil of the second coil unit.

Abstract: An earth configuration achieving easy installment without deteriorating performance of an antenna device. The antenna device has a balanced antenna element, a shield plate arranged between the balanced antenna element and a conductor of a car, and a supporting member, and the shield plate blocks electrical coupling of the conductor from the balanced antenna element when the antenna device is mounted on the body of the car.

Abstract: Identification tags are secured to parcels moving upon a conveyor belt. The identification tags each contain a transponder circuit in electrical communication with a transponder antenna. The transponder circuit contains a unique digital code containing data relating to the parcel. When the identification tag is located beneath a parcel, at least one reader circuit is positioned beneath the conveyor belt in alignment with a selected aperture extending through the. One or more apertures in alignment with the reader antenna provide electrical communication with the reader antenna. The reader circuit generates a signal in the presence of an identification tag, which is transmitted to the transponder antenna located on the identification tag. The signal energizes the transponder circuit in the identification tag, which sends a unique digital code via the transponder antenna back to the reader antenna.

Abstract: A small radio apparatus such as a pager has a printed circuit loop antenna(12) comprising a generally elongate loop formed by first and second electrical conductors(22,24) interconnected by first and second electrically conductive end portions(18,20). A fixed value high Q capacitance(26) is incorporated into the first end portion(18) and a variable capacitance(30) is incorporated in a tap(28) interconnecting the first and second conductors(22,24) adjacent to, but spaced from, the second end portion(20). The loop antenna may be fabricated from low loss material or may comprise a track or back-to-back tracks on a dielectric substrate. The loop antenna(12) may be connected directly to RF circuitry or may be coupled inductively to the RF circuitry.

Abstract: An antenna array for detecting a coded radio frequency identification (RFID) tag signal generated by a tag during passage of the tag through a detection volume, or portal. The array comprises at least first and second antennas disposed at different positions around the periphery of the detection volume, and circuitry, having inputs connected to receive the respective output signals from the first and second antennas and an output connected to a signal receiver for decoding the detected signal. The circuitry provides an output signal including the respective output signals of the first and second antennas, and the sum of the output signals of the first and second antennas. Preferably, the output signal of the circuitry additionally includes the inverse of the output signal of the second antenna, and the sum of the output signal of the first antenna and the inverse of the output signal of the second antenna.

Abstract: An antenna of the long frame-type wherein the ratio between the long side and the short side is between 1:4 and 1:8 and the length of the long side is equivalent to one wavelength of the central frequency. One pair of short bars are deployed so that they are located at a distance corresponding to 1/4th to 1/40th of the distance from both end parts of the entire long side length of each long side element. The two end portions of the long side of the antenna is symmetrically bent with respect to a central portion such that the two end portions form an angle of 45 to 90 degrees with respect to the central portion and are parallel to each other.

Abstract: A loop antenna includes a dielectric substrate, and an antenna conductor forming a loop that extends over a surface of the substrate. A matching circuit near the conductor is dimensioned and arranged for electromagnetically coupling a radio frequency circuit with the antenna conductor. In one embodiment, the antenna conductor forms a closed loop on a surface of a first substrate layer, and the matching network includes a strip transmission line on a surface of a second substrate layer overlying the antenna conductor on the first substrate layer. The substrate layers form part of an interface unit that provides a wireless data link with a residential electric utility meter.

Abstract: An antenna arrangement includes a passageway having at least one side and an antenna located in a substantially vertical plane of the side. The antenna has one or more coils, each having a corner and adjacent straight portions oriented at an acute angle to a floor surface of the passageway. The acute angle is preferably 30.degree. to floor surface.

Abstract: An antenna coil with low electrical field emissions comprises a flat winding with a specified shape and a conductive screen facing the winding. The conductive screen has substantially the same shape as the winding, and includes a cut-off zone. The screen neutralizes the parasitic electrical field emitted by the winding without disturbing the useful magnetic field which is axially oriented (i.e., oriented perpendicularly to the plane of the coil). Such an antenna coil is applicable to a station for the transmission-reception of data by inductive coupling.

Abstract: A first loop antenna apparatus is disclosed which includes an open loop antenna portion and an inductor having a predetermined inductance and first and second ends connected to first and second intermediate points of the open loop antenna portion. The inductance of the first loop antenna apparatus is decreased because the inductor is connected in parallel, so that an opening area (antenna gain) is increased at the same resonant condition. A second loop antenna apparatus is also disclosed which includes an open loop antenna portion, a first inductor having a predetermined inductance, one end of the first inductor being connected to first intermediate point of the open loop antenna portion, a second inductor having the predetermined inductance, one end of the second inductor being connected to a second intermediate point of the open loop antenna portion, and a capacitor having a predetermined capacitance, connected the other ends of the first and second inductors.

Abstract: An antenna is disclosed that has windings that are contrawound in segments on a toroid form and that have opposed currents on selected segments. An antenna is disclosed that has one or more insulated conductor circuits with windings that are contrawound around and over a multiply connected surface, such as a toroidal surface. The insulated conductor circuits may form one or more endless conductive paths around and over the multiply connected surface. The windings may have a helical pattern, poloidal peripheral pattern or may be constructed from a slotted conductor on the toroid. Poloidal loop winds are disclosed with a toroid hub on a toroid that has two plates that provides a capacitive feed to the loops, which are selectively connected to one of the plates. Associated methods are also disclosed.

Abstract: The invention encompasses license plate frame assemblies having modulators, transponders or radio frequency identification devices (RFIDs) incorporated therein. Further, the invention encompasses methods of attaching transponders, modulators, and RFIDs to vehicles. In one aspect, the invention includes a method of forming a license plate frame comprising: providing a license plate frame substrate, the license plate frame substrate being configured to mount to a vehicle and being configured to receive and retain a license plate; and mounting a transponder to the license plate frame substrate.

Abstract: A GPS wave antenna apparatus according to the present invention includes a substrate unit having a printed board on which an antenna constituting element including a GPS wave antenna element is mounted integrally as one component, a case having an opening portion at one end, for detachably receiving the substrate unit through the opening portion, and a conductive plate attached to the case so as to block the opening portion and arranged opposite to the GPS wave antenna element at a fixed distance therebetween. The GPS wave antenna element has a thin-film conductive pattern, and the substrate unit includes a low noise amplifier provided on the printed board and a feeder connected to a feeder section of the antenna element through the low noise amplifier.

Abstract: The present invention provides an internal antenna for mobile terminals that provides performance comparable with externally mounted antennas. The antenna is of a looped dipole configuration wherein the resonating elements of the antenna are integrated within or located on an inside or outside surface of the terminal's housing. The looped-shaped resonating elements may be placed around other components of the phone without significantly infringing on precious, physical space. For example, the loop elements may be placed around the keypad, around the display, around any portion or outline of the housing, and in a flip portion hingeably engaging a main section of the housing. Preferably, the antenna is a two-sided, half-wave antenna having two rectangular-shaped loop dipole elements.

Abstract: A communications device comprises a loop antenna having a plurality of feed terminals defining at least two terminal pairs. A controller is provided for selecting one terminal pair to enable reception or transmission from the loop antenna using the selected terminal pair. The selection of terminal pair is made based on the measurement of at least one parameter which is responsive to the proximity to the antenna of, for example, a user of the device. One terminal pair provides an antenna having matched impedance when the user is near the device, and the other terminal pair provides an antenna having matched impedance when the user is distant.

Abstract: A wrist band antenna prevents connection failure and/or breakdown due to attachment/detachment of a loop antenna and has a receivable frequency band which is not affected by the thickness of the wearer's arm. A U-shaped antenna structure is mounted inside a wrist band part which is part of the wrist band divided at the center fastening structure. The U-shaped structure functions as an independent antenna on at least one part of the wrist band. The antenna is buried in the wrist band part so that the two ends of its U-shaped structure face toward a receiver main body. When each of two contact pins on the ends of the U-shaped structure connect the wrist band with the receiver main body, a terminal spring on a reception circuit substrate of the receiver main body is pressed. This causes the receiving signal from the antenna to be conveyed to the receiver main body.

Abstract: An antenna for transmitting and receiving circularly polarized electromagnetic radiation which is configurable to either right-hand or left-had circular polarization. The antenna has a conductive plane and a closed conductive loop spaced from the plane. A signal transmission line is electrically coupled to the loop at a first point and a probe is electrically coupled to the loop at a spaced-apart second point.

Abstract: An antenna element is disclosed that is a set of approximately coplanar conductors that form four approximately triangular conductors, each of which has a perimeter of approximately one wavelength. Three parallel conductors are the central part and the two outer parts. Joining these three parallel conductors, there are four diagonal conductors, of approximately equal length, that connect each end of the central parallel conductor to the opposite end of each of the outer parallel conductors. Where these diagonal conductors cross, they do not touch. Compared to previous antennas constructed for the same purposes, antennas constructed with these antenna elements can yield more directivity, particularly in the principal H plane, or more bandwidth. Several applications of such antenna elements in various arrays also are disclosed.

Abstract: Methods of forming electronic signal transmitting/receiving devices and electronic signal transmitting/receiving devices are described. In one implementation, integrated circuitry including transponder circuitry is provided and operatively coupled with an antenna to provide a transmitting/receiving circuit. A matrix material comprising suspension structure is formed and applied over at least a portion of the antenna, the suspension structure being selected to manipulate an operating characteristic of the transmitting/receiving circuit. According to a preferred aspect of the invention, the operating characteristic comprises an electrical length of the antenna and the application of the matrix material effectively increases the electrical length to resonate the antenna at a desired frequency. According to another preferred aspect of the invention, the suspension structure comprises calcium carbonate.

Abstract: An electrically small antenna is disclosed that is constructed from a generalized contrawound toroidal helix made from a single continuous conductor divided into two length portions each of which are substantially the same length and which have a generalized helical pattern. The helical pitch senses the two length portions are opposite to one another. The two length portions are insulated from one another and overlap one another on the surface of a generalized toroid. A signal is fed to the antenna at a port defined by the node locations where the respective length portions join one another, or at a diametrically opposite point. At the fundamental mode of operation, the antenna is a half guided wavelength in circumference. The size of the antenna is further reduced because of the slow-wave properties of the underlying generalized contrawound toroidal helix.

Abstract: An antenna apparatus for receiving an electric wave, includes an antenna element for receiving an electric wave made from an elastic linear body of a loop shape which can be collapsed into a plurality of loops of a smaller diameter; a shape retaining member made from a sheet-shaped member such as cloth and spread inside the antenna element so as to maintain a spread state of the antenna element spread into a loop shape; and connection means for connecting the antenna element to an external device. Because the antenna element can be collapsed into a plurality of loops of a smaller diameter, the antenna apparatus can be reduced into a smaller size for carrying.

Abstract: A portable communication device is described comprising a loop antenna. The loop antenna consists of a dielectric strip with overlapping conductive plates on both sides, so that capacitors are formed, which are arranged in series with one another. In order to have a good efficiency and at the same time a high insensitivity for detuning due to capacitive coupling of the antenna to the body of the user, the number of capacitors should be less than five an the capacitors should be arranged widely spaced over the loop.

Abstract: A spiral antenna (100) having a feed-point end and a termination end for use within a portable two-way radio housing includes a ground substrate (102) and a number of spiral elements (103, 105) having a number of segments that form two or more spiral shapes. A shorting stub (107) connects the planar elements at a termination end for effectively increasing the feed-point impedance of the spiral antenna (100). The spiral elements (103, 105) may be positioned in a planar arrangement (FIGS. 1 and 2) or may be stacked in separate planes (FIGS. 3 and 4) for forming a limited space antenna having a substantially 50 ohm feed-point end impedance at resonance.

Abstract: An RFID antenna system is described comprising an elongated antenna disposed proximate an interrogation path for interrogating transponders moving along the interrogation path. The antenna is oriented such that the longitudinal axis of the antenna is substantially perpendicular to said interrogation path. The antenna provides an active RF interrogation zone that intersects at least 40% of the horizontal longitudinal plane of the interrogation path.

Abstract: An internal antenna (302) for a wearable electronic device (1000) includes first and second elongated conductor segments (416, 418) which are fabricated in a form of an arc to conform substantially to a portion of a substantially circular housing cavity, and first and second shortened conductor segments (420, 422). The first and second elongated conductor segments (416, 418) and the first and second shortened conductor segments (420, 422) are formed into a single turn loop having a rectangular antenna aperture (436). Connection tabs (424) are formed contiguous with, and located symmetrically about, a midpoint of one of the first and second elongated conductor segments (416, 418) and couple the antenna (302) to a receiver (1104) which is located on a circuit substrate (406) which is positioned between the first and second elongated conductor segments (416, 418).

Abstract: An antenna includes a transmitter including a first transmit coil wound in a first direction. A second transmit coil is electrically coupled to the first transmitter and wound in a second direction opposite to the first direction.

Abstract: A portable radio device helical antenna 1 is fabricated by a method wherein the cutting boss component 6 of a molded element 7, that has a spirally cut groove 4 formed around an insulator and that has a mounting component 3 at one end and the boss component 6 at the other end, is chucked, the components are metal plated, the metal layer is then removed except from the groove 4 and mounting component 3, the boss component 6 is then cut off and that location is machined, and a radio device base plate fixing hole 9 is formed in the mounting component 3. The mounting component 3 is then mounted on the base plate of a radio device main body.