Abstract: To be able to downsize an electronic apparatus having an antenna having a plurality of antenna coils. A radio wave timepiece includes an antenna for receiving a radio wave signal including time information and the antenna is provided not to be projected from a contour of a timepiece movement. The antenna includes a plurality of antenna coils wound to laminate on a core, when the antenna 101 is used by being contained in a metal cabinet, the antenna coil wound around an upper layer and having a large inductance value is used, when the antenna is used by being contained in a plastic cabinet, the antenna coil wound around a lower layer and having a small inductance value is used, thereby, regardless of a kind of the cabinet, the radio wave timepiece can be downsized and a predetermined radio wave receiving sensitivity can be achieved.

Abstract: An antenna device includes a core portion made of magnetic material, a wire coiled around the core portion leaving a leading end portion by a predetermined length, a case holding the core portion on which the wire is coiled and fixed on a body of a vehicle, and an elastic member provided between the core portion and the case for holding the core portion relative to the case.

Abstract: The chip antenna shown is provided with two chip antenna elements (the 1st chip antenna element 4, the 2nd chip antenna element 2). These chip antenna elements have the 1st magnetic base 10 and the 2nd magnetic base 8, and linear conductors 7 and 5 formed in the core, respectively. Magnetic base 10 and magnetic base 8 are separated. In the 1st chip antenna element 4, linear conductor 7 formed in the core of the 1st magnetic base 10 was formed to the end face of this magnetic base, and the end has protruded from said end face. On the other hand, in the 2nd chip antenna element 2, linear conductor 5 formed in the core of the 2nd magnetic base 8 has penetrated magnetic base 8. Furthermore, conductor 7 in the 1st chip antenna element and conductor 5 in the 2nd chip antenna element are electrically connected mutually in series by connection conductors 13 arranged among these chip antenna elements.

Abstract: A magnetic member is interposed and arranged between an antenna element and a printed circuit board, and an air member or a dielectric member is interposed between the antenna element and the magnetic member. The magnetic member is constituted of a nanogranular structure in which magnetic nanoparticles with ferromagnetism are three-dimensionally dispersed and arranged in an insulating matrix substrate.

Abstract: An antenna coil has a simple structure and a high sensitivity and can be thinner. The antenna coil includes an X Y coil unit having an X axis coil and a Y axis coil wound around a core, a Z axis coil wound around the X Y coil unit, and a resin portion insert molded around the X Y coil unit and the Z axis coil. In the antenna coil, the X axis coil, the Y axis coil, and the Z axis coil are arranged so that the three coils have an axis in a direction orthogonal to each other, and the X Y coil unit and the Z axis are integrated by the resin portion.

Abstract: A system and method for implementing an antenna system for multiple antennas using a single core. The method may include providing a first core, a first winding would about the first core for transmitting/receiving electromagnetic signals, and a second winding for transmitting/receiving electromagnetic signals would about the first core and the first winding. The first winding and the second winding may be wound such that a direction of a first magnetic field generated by the first winding is different than a direction of a second magnetic field generated by the second winding. The method may also include proving for activation circuitry connected to the first winding and the second winding. The activation circuitry may activate the first winding separately from the second winding. The method may provide three or more coils/antennas disposed on a single core. The method may choose stronger of the received magnetic fields from the first or the second coil, for processing.

Abstract: An antenna structure that can be received in a case in a condition that an occupied space is minimized, and allows reception of an electric wave at excellent sensitivity, and a wave clock having the antenna structure, and a method for manufacturing the antenna structure are provided. An antenna structure of a wave clock has an arcuately curved, soft-magnetic magnetic core member, and a coil wound on the center in an extending direction of the magnetic core member, and is received in a case. In the antenna structure, the magnetic core member has outer circumferential surfaces at at least one of ends exposed from the coil, the surfaces extending non-arcuately such that it is situated at more inner circumferential side as it approaches a tip.

Abstract: The present invention provides for low loss tunable matching circuits at rf frequencies. Ferro-electric materials are used to produce low loss tunable capacitors and inductors for use in matching circuits.

Abstract: The present invention is directed to a broadband electric-magnetic antenna apparatus and method. The present invention teaches a variety of electric antennas suitable for use in the present invention as well as a variety of magnetic antennas suitable for use in the present invention. Combination of a broadband electric antenna element and a broadband magnetic element to create a broadband electric-magnetic antenna system is discussed. This invention further teaches systems for using a broadband electric magnetic antenna system to radiate or receive quadrature signals.

Abstract: A magnetic core antenna system including a magnetic core and a winding network. The winding network may be configured with a non-uniform ampere-turn distribution to achieve a desired flux density in the core. The network may include a plurality of windings configured to provide a winding impedance facilitating optimal transmitter power delivery to the windings. A magnetic core may be constructed from multiple components having longitudinal contact surfaces and joined by a transverse clamping force. An air gap may be provided between the components to allow relative movement therebetween.

Abstract: A protector for a portable wireless communication device that has a housing and a keypad. One embodiment of the protector may comprise a cover member that is pivotally attached to the housing and selectively pivotable between a first position wherein the cover covers the keypad and other positions wherein the keypad is exposed. The cover may be provided with one or more openings or notches to permit access to certain components on the keypad such as a thumbwheel, etc. without removing the cover member. The cover member may be provided with a latch to retain the cover member in position. If desired, an antenna may be coupled to the cover. The antenna may be physically coupled to the device's receiving and transmitting circuitry or it may be capacitively coupled thereto.

Abstract: A passive integrated transponder (PIT) tag comprising an integrated circuit and a unitary core is described. The unitary core comprises a coil-forming portion proximate one end thereof and an integrated circuit support portion proximate an opposite end thereof. The integrated circuit support portion extends beneath and supports the integrated circuit.

Abstract: An antenna has: a core; a coil which is wound on the core; and a magnetic body layer to cover both end portions of the coil and a peripheral portion of the core other than a portion of the core on which the coil is wound.

Abstract: As provided herein, a dual- or quad-ridged broadband horn antenna may include a pair of conductive antenna elements arranged opposite one another for guiding an electromagnetic wave in a longitudinal direction through the horn antenna. In some cases, the pair of conductive antenna elements may include substantially convex inner surfaces and appropriately shaped outer surfaces. The convex inner surfaces may generally function to direct or guide the radiated energy without disturbing the intended radiation pattern. To maintain the intended radiation pattern, the broadband horn antenna may also include a pair of tapered extension elements, each coupled to an outer surface of a different one of the antenna elements at one end thereof. In some cases, a magnetic material may be arranged upon at least a portion of the antenna elements to restrict surface currents to flowing along the inner surfaces only.

Abstract: A system and method for multiple antennas on a single core. The system may include a first core, a first winding wound about the first core for transmitting/receiving electromagnetic signals, and a second winding for transmitting/receiving electromagnetic signals wound about the first core and the first winding. The first winding and the second winding may be wound such that a direction of a first magnetic field generated by the first winding is different than a direction of a second magnetic field generated by the second winding. The system may also include activation circuitry connected to the first winding and the second winding. The activation circuitry may activate the first winding separately from the second winding. The system may be expanded to three or more coils/antennas disposed on a single core.

Abstract: Disclosed is a wideband antenna with a lowered standing wave ratio. The wideband antenna interposes a substance whose conductivity is about 0.1 through 10.0 as an interposition between a reference conductor and a radiation conductor; and thereby, the antenna reduces reflections of signals, and achieves a wider bandwidth as well as a sufficient gain with a lowered standing wave ratio. Also, the invention realizes a thin-type wideband antenna with a wider bandwidth and a sufficient gain, by interposing a magnetic substance whose relative permeability is more than 1 through about 8 as the interposition between the reference conductor and the radiation conductor.

Abstract: Inductors and inductive devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin host. The ratio of the weight of the conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers to the weight of the base resin host is between about 0.20 and 0.40. The micron conductive powders are formed from non-metals, such as carbon, graphite, that may also be metallic plated, or the like, or from metals such as stainless steel, nickel, copper, silver, that may also be metallic plated, or the like, or from a combination of non-metal, plated, or in combination with, metal powders. The micron conductor fibers preferably are of nickel plated carbon fiber, stainless steel fiber, copper fiber, silver fiber, or the like.

Abstract: The present invention provides an antenna device capable of automatically obtaining excellent receiving sensitivity over a wide band. The antenna device comprises a rod-shaped base made of a dielectric material or a magnetic material; a stripe-shape radiating conductor divided into a plurality of radiating conductors wound around the base; and variable capacitive elements provided to correnspond to the same number of the radiating conductors. The radiating conductors and the variable capacitive elements are alternatively arranged on the base and are connected in series to each other, the radiating conductor having its one end connected to the variable capacitive element serves as an opening side and the variable capacitive element having its one end connected to the radiating conductor serves as a signal feeding side, and capacitance values of the variable capacitive elements increase or decrease in the same direction to be tuned to a predetermined frequency.

Abstract: To provide a loop antenna capable of attenuating the distant electric field with the attenuation of the magnetic flux in the vicinity of an electromagnetic wave restrained, and a contactless IC card read/write apparatus. A loop antenna 10 has an electromagnetic wave shield 1 over at least one side of the loop antenna, the electromagnetic wave shield 1 comprising a plurality of electric conductors 2, a ground contact 3 for grounding the plurality of electric conductors and a lead wire 4 for connecting the plurality of electric conductors 2 to the ground contact 3. The plurality of electric conductors 2 are electrically connected via the lead wire 4 to the ground contact 3 and the plurality of electric conductors 2 are arranged so that the paths of the respective electric conductors 2 from any of their given points to the ground contact 3 via the lead wire 4 are determined uniformly.

Abstract: A triaxial antenna coil prevents wires from snapping, increases productivity, is resilient against dropping, and is suitable for being made small and light. A triaxial antenna coil includes coils, that are wound around three intersecting winding axes, and a flat core having winding grooves in three intersecting axial directions. A base has a terminal element, that is fitted with a plurality of external connectors and terminal connectors of windings. The base is fixed to one face of the core. The coils are wound in respective winding grooves, and their terminals are connected to the terminal connectors of the terminal element.

Abstract: A device by an antenna (1) where the coil conductor (2) of the antenna is wound around a ferrite rod/tube (4), and where one conductor (12) of a connecting cable (10) is electrically coupled to one end portion (2a) of the coil conductor (2) of the antenna (1), and the other conductor (14) of the connecting cable (10) is electrically coupled to a connection point (2b), the connection point (2b) being located on the coil conductor (2), between the two end portions (2a) and (2c) of the coil conductor.

Abstract: A coil antenna is disclosed comprising a magnetic core and a wire wound around the magnetic core. The magnetic core is made of a mixture comprising soft magnetic powder and an organic binder agent. The magnetic core has a specific complex permeability whose real part ?? is 20 or more over a frequency range of 10 MHz or less and whose imaginary part ?? is 10 or more over a frequency range of 10 MHz or more so that the magnetic core is also servable as a noise suppressor against high-frequency noise.

Abstract: An antenna includes a first core made of magnetic material, a coil including a conductive wire wound around a predetermined region of the first core, and a second core made of magnetic material. The second core is operable to move an inside of the coil. The antenna has a resonant frequency adjustable over a wide rage.

Abstract: An EAS or RFID system including first and second core antenna systems. The first and second antenna systems establish magnetic fields having opposite directions and are positioned so that the fields at least partially cancel outside of an interrogation zone for detecting an EAS or RFID tag. There is also provided an EAS or RFID wherein the magnetic field direction established by a core antenna is varied at certain time intervals to minimize the effects of null zones in the interrogation zone.

Abstract: A combination of a radio frequency identification transponder (RFID Tag) and to a magnetic electronic article surveillance (EAS) device is disclosed. The present invention relates generally to radio frequency identification (RFID) systems, and more specifically to RFID transponders for use in RFID systems and the method for their assembly.

Abstract: An antenna is comprised of a core portion laminated by a magnetic ribbon through a deformable member and a coil portion wound around the core portion.

Abstract: Method for constructing a radome (110). The method can include the steps of providing a radome structure, wherein the radome structure can include at least one of a radome wall (115) and a radome frame (120). The radome structure can be impedance matched to an operational environment. The impedance match can be independent of the thickness and geometry of the radome structure.

Abstract: A wide-band antenna assembly is mounted on a circuit board including a contact and a radio frequency module electrically connected to the contact. The assembly comprises a plane antenna formed of a thin film based magnetic material, and a cover formed of metal material having shielding capability. The cover is releasably secured to the circuit board and includes a rectangular recess with the plane antenna glued or adhered therein by insulating adhesive and a slit on the recess for permitting a bent end of the plane antenna to pass through to be electrically connected to the contact. The antenna is further bridged to the metal cover by a conducting wire so as to utilize the gain effect of the metal cover itself. The assembly can substantially eliminate adverse effect and electric noises caused by electrical/electronic components of the circuit board, resulting in a great improvement of communication quality.

Abstract: A low profile antenna includes an antenna and a ground plane structure operatively associated with the antenna. The ground plane structure has a generally planar surface, at least one protrusion extending from the planar surface and a dielectric substrate supported by the planar surface. The dielectric substrate includes a relative permeability (?) of greater than or equal to about one and a relative permittivity (?) of greater than or equal to about one.

Abstract: An antenna device for installation on vehicles, which antenna device including a core made of a magnetic material, a holding portion provided by a dielectric film sheet wound around the core, a coil formed with a linear conductor wound around the holding portion, a case made of a dielectric resin material for housing the core, the holding portion and the coil, and a flexible dielectric resin filling the space within the case excluding the core, the holding portion and the coil.

Abstract: A passive integrated transponder (PIT) tag comprising an integrated circuit and a unitary core is described. The unitary core comprises a coil-forming portion proximate one end thereof and an integrated circuit support portion proximate an opposite end thereof. The integrated circuit support portion extends beneath and supports the integrated circuit.

Abstract: This invention aims to provide a communication device, installation structure for the communication device, a method of manufacturing the communication device, and a method of communication with the communication device in which the communication device is able to exceedingly restain a conductive material from attenuating magnetic flux and to expand communication distance even when the communication device is attached to a conductive member e.g., metal, in a closely contacting manner. This invention has a sheet-like amorphous magnetic material being arranged in a manner extending from a magnetic flux generating portion of a concentric disk-shaped antenna coil of an RFID tag serving as the communication device to an outer area of the antenna coil.

Abstract: The method for evaluating electrical field levels in the near-zone of transmitting antennas, particularly linear array antenna widely used in cellular telephony systems, provides accurate evaluation while requiring reduced processing times and a restricted set of input data, such as physical external dimensions of the antenna, its gain and its radiation patterns in the vertical plane and in the horizontal plane.

Abstract: A transmission/reception radio-wave aerial for an interrogation device for electronic labels carried by objects, the transmission/reception radio-wave aerial being tuned to an F0 frequency and each electronic label including a radio-wave aerial tuned to the F0 frequency and being associated with an electronic circuit, wherein the transmission/reception radio-wave aerial is arranged to create a magnetic field which modifies the tuning frequency for the radio-wave aerials for the electronic labels in such a way to retune towards the F0 frequency of the aerial of the interrogation device.

Abstract: A loop antenna is formed on one side of a circuit board and an IC chip is mounted on the same side of the circuit board. An inner end of the loop antenna is connected to an antenna connection terminal of the IC chip. An arm part provided with a first pad part, a second pad part, and a conducting wire for allowing conduction between the fist pad part and the second pad part is collapsibly provided in such a manner that, when the arm part is collapsed, an outer end of the loop antenna contacts the first pad part and an antenna connection terminal of the IC chip contacts the second pad part.

Abstract: A miniature broadband stacked microstrip patch antenna formed by two patches, an active and a parasitic patches, where at least one of them is defined by a Ring-Like Space-Filling Surface (RSFS) being this RSFS newly defined in the present invention. By means of this novel technique, the size of the antenna can be reduced with respect to prior art, or alternatively, given a fixed size the antenna can operate at a lower frequency with respect to a conventional microstrip patch antenna of the same size and with and enhanced bandwidth. Also, the antennas feature a high-gain when operated at a high order mode.

Abstract: An AM radio antenna circuit having a ferrite bar loop antenna comprises a resonating structure forming a balanced antenna circuit, a varactor diode tuning structure presenting a controllable capacitance to said winding structure, a DC path including the winding structure coupled to the varactor constructed and arranged to deliver a tuning signal to the varactor, and means for connecting the antenna circuit to the input of an external detector integrated circuit.

Abstract: A photonic crystal having reversibly tunable photonic properties. The photonic crystal includes a phase change material having a plurality of structural states that vary with respect to fractional crystallinity. Optical constants including refractive index, extinction coefficient and permittivity vary as the fractional crystallinity of the phase change material is varied thereby providing tunability of photonic crystal properties. Variations among the structural states of the phase change material are reversibly effected through the addition of energy in forms including optical or electrical energy. The photonic crystals may include defects that provide photonic states within the photonic band gap. The position of these states is tunable through the control of the fractional crystallinity of the phase change material included in the photonic crystal. Electromagnetic radiation resonators including photonic crystals having photonic states in the photonic band gap are further provided.

Abstract: Antenna structure (200) which finds particular utility in mobile stations and the electrical characteristics of which can be electrically modified. The radiating element (210) of the antenna or a part thereof is manufactured from a strongly magnetostrictive material. The antenna is equipped with at least one electromagnet (220) by means of which a magnetic field (?) can be generated into the magnetostrictive material. This causes the radiating element to grow (?l) in a certain direction, whereby the resonance frequency of the antenna will decrease. The antenna can be electrically adjusted without adding any component in the antenna itself, thereby making the adjustment reliable.

Abstract: A local radio-frequency antenna for a magnetic resonance apparatus is fashioned for a region to be imaged in an edge region of and/or outside an imaging volume of the magnetic resonance apparatus, and the radio-frequency antenna has a passive shim device.

Abstract: A family of FE dielectric-tuned antennas and a method for frequency tuning a wireless communications antenna are provided. The method comprises: forming a radiator; forming a dielectric with ferroelectric material proximate to the radiator; applying a voltage to the ferroelectric material; in response to applying the voltage, generating a dielectric constant; and, in response to the dielectric constant, communicating electromagnetic fields at a resonant frequency. Some aspects of the method further comprise: varying the applied voltage; and, modifying the resonant frequency in response to changes in the applied voltage. Modifying the resonant frequency includes forming an antenna with a variable operating frequency responsive to the applied voltage. Alternately stated, forming an antenna with a variable operating frequency includes forming an antenna with a predetermined fixed characteristic impedance, independent of the resonant frequency.

Abstract: A magnetic core antenna system including a magnetic core and a winding network. The winding network may be configured with a non-uniform ampere-turn distribution to achieve a desired flux density in the core. The network may include a plurality of windings configured to provide a winding impedance facilitating optimal transmitter power delivery to the windings. A magnetic core may be constructed from multiple components having longitudinal contact surfaces and joined by a transverse clamping force. An air gap may be provided between the components to allow relative movement therebetween.

Abstract: The present invention provides for low loss tunable matching circuits at rf frequencies. Ferro-electric materials are used to produce low loss tunable capacitors and inductors for use in matching circuits.

Abstract: The helical antenna comprises a base body and a helically-configured conductor on a top surface of the base body, wherein base body's thickness a is given as 0.3≦a≦3 (mm); length b is given as 5≦b≦20 (mm); and relative dielectric constant &egr;r is given as 3≦&egr;r≦30, and conductor's winding number x is given as 3≦x≦16 (turns), and its resonant frequency f and conductor width w satisfy formulae (1): f=Ax+By+C (MHz) and (2): w=Dx+E (mm), where y represents base body width and A through E represent constants determined according to the base body's thickness a, length b, and relative dielectric constant &egr;r.

Abstract: An inverted-F ferroelectric antenna is provided. The antenna comprises a counterpoise, or groundplane, and a radiator structure having a first end and a second end. A capacitor, formed from a ferroelectric dielectric is interposed between the second end of the radiator and the counterpoise. The capacitor has a variable dielectric constant, and the antenna is resonant at a frequency responsive to the dielectric constant of the capacitor ferroelectric material. Typically, the capacitor includes a dielectric formed from a fixed constant dielectric, together with a ferroelectric dielectric with a variable dielectric constant. A bias voltage feed is used to apply a voltage to the capacitor ferroelectric dielectric. The ferroelectric dielectric has a dielectric constant that varies in response to the applied voltage.

Abstract: Inductors and inductive devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin host. The ratio of the weight of the conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers to the weight of the base resin host is between about 0.20 and 0.40. The micron conductive powders are formed from non-metals, such as carbon, graphite, that may also be metallic plated, or the like, or from metals such as stainless steel, nickel, copper, silver, that may also be metallic plated, or the like, or from a combination of non-metal, plated, or in combination with, metal powders. The micron conductor fibers preferably are of nickel plated carbon fiber, stainless steel fiber, copper fiber, silver fiber, or the like.

Abstract: A structure (40) with switchable magnetic properties comprises: an array of capacitive elements (44) in which each capacitive element (44) includes a low resistance conducting path and is such that a magnetic component (H) of electromagnetic radiation (12) lying within a predetermined frequency band induces an electrical current (j) to flow around said path and through said associated element (44). The size of the elements (44) and their spacing (&agr;) apart are selected such as to provide a predetermined permeability (&mgr;) in response to said received electromagnetic radiation (12). Each capacitive element (44) comprises a plurality of stacked planar sections (42) each or which comprises at least two concentric spiral conducting members or tracks (46, 48) which are electrically insulated from each other. A switchable permittivity material, such as Barium Strontium Titanate (BST) is provided between the tracks.

Abstract: A slot fed microstrip antenna (100) having an improved stub (118) provides enhanced efficiency through more efficient coupling of electromagnetic energy between the feed line (117) and the slot (106). A dielectric layer (105) disposed between the feed line (117) and the ground plane (108) provides a first region (112) having a first relative permittivity and at least a second region (113) having a second relative permittivity. The second relative permittivity is higher as compared to the first relative permittivity. The stub (118) is disposed on the high permittivity region (113). The dielectric layer can include magnetic particles, which are preferably disposed underlying the stub.

Abstract: Optical modulators are provided. A representative optical modulator includes an optical medium that is adapted to propagate optical signals. An array of lattice sites are arranged in the optical medium, with at least some of the lattice sites exhibiting lower refractive indexes than the refractive index of the optical medium. Preferably, a first of the lattice sites incorporates a first optical component that is moveable relative to the optical medium. By moving the first optical component relative to the optical medium, a propagation characteristic of the optical medium can be altered. Optical systems, methods and other optical modulators also are provided.

Abstract: A portable communications and display system and methodology is provided in accordance with the present invention. The system includes a chip antenna for transmitting and receiving RF signals, a lens material for mounting the chip antenna and a conductive material for providing a chip antenna ground plane. The conductive material provides an operative coupling between the lens material and the chip antenna. A communications subsystem is provided that is associated with the lens material and is operatively coupled to the chip antenna for processing the RF signals.