Abstract: An antenna structure capable of receiving an external radio signal has a structure that enables reception of magnetic flux caused by an external radio signal, but has a magnetic path that makes it difficult for magnetic flux generated by resonance to leak to said outside of said antenna structure, said magnetic path being formed minimally by an antenna part, which is formed by at least one antenna core part and a coil part formed by winding of a conductive wire around said antenna core part, and a cover part disposed in a vicinity of said antenna part and covering at least a part of said antenna part, said antenna core part and cover part being made of a soft magnetic material, and also said cover part being joined to said antenna part at both ends of said antenna core part of said antenna part.

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 device includes an antenna for receiving a time information radio wave, and an antenna support member. In the antenna, a coil is wound around a center portion of a core. In the support member, a non-magnetic portion supports two magnetic portions independently and both end portions of the core of the antenna are magnetically coupled with the magnetic portions. A radio wave controlled timepiece includes a case in an inner space of which the antenna and the support member are installed as described above. In the inner space, a time counting unit, a time display unit connected to the time counting unit, and a time updating unit configured to update the time displayed on the display unit, based on the time information radio wave received by the antenna, are installed.

Abstract: According to an aspect of the present invention, there is provided a radio system including: a first radio apparatus that has a first loop antenna; and a second radio apparatus that has a second loop antenna and that performs a radio communication with the first radio apparatus when the second loop antenna is opposed with the first loop antenna, wherein the second radio apparatus has a shield member that is formed of a magnetic substance and disposed to shield at least a portion of the second loop antenna with respect to the first loop antenna when the radio communication is performed.

Abstract: A superior high-frequency magnetic material having a smaller ratio (??/??) of a real part ?? of permeability and an imaginary part ?? of permeability in a high-frequency region and an antenna system using thereof are provided. The high-frequency magnetic material includes a substrate and a composite magnetic film formed on the substrate and made of a magnetic phase forming a plurality of columnar bodies whose longitudinal direction is directed in a direction perpendicular to a surface of the substrate and an insulator phase filling gaps of the columnar bodies. The magnetic phase contains at least one of Nb, Zr, and Hf, and Fe and B, is amorphous, and has in-plane uniaxial anisotropy of Hk2/Hk1?3 and Hk2?3.98×103 A/m when a minimal anisotropic magnetic field in a plane parallel to the surface of the substrate is Hk1 and a maximal anisotropic magnetic field is Hk2.

Abstract: An antenna apparatus includes an antenna block and a substrate. The antenna block has a base that is made of a substantially cuboid dielectric body, an upper-surface conductor formed on an upper surface of the base, first and second pad electrodes that are formed on both ends of a bottom surface of the base in a longitudinal direction of the base, respectively, and a lateral-surface conductor connecting the upper-surface conductor and the second pad electrode. The substrate has a region mounting the antenna block, a ground pattern provided around the mounting region, first and second lands that are provided within the mounting region so as to correspond to the positions of the first and second pad electrodes, a feed line that is connected to the first land, an impedance-adjusting pattern connecting the first land and the ground pattern, and a frequency-adjusting pattern connecting the second land and the ground pattern.

Abstract: A highly bendable antenna core (8) which is highly bendable for high-frequency identification systems substantially retains its soft-magnetic properties when bending occurs. The antenna core is produced by using specific amorphous or nanocrystalline alloys having a very low magnetostriction value. The antenna core (8) is embodied in the form of a laminate with/or without insulating layers placed therebetween. An antenna can be provided with one such antenna core.

Abstract: A device of a rod antenna comprising a supply transformer and first and second beam elements, wherein both beam elements are provided with a ferrite material.

Abstract: A superior high-frequency magnetic material having a smaller ratio (??/??) of the real part ?? of permeability and the imaginary part ?? of permeability in a high-frequency region and an antenna device using thereof are provided. The high-frequency magnetic material includes a substrate and a composite magnetic film formed on the substrate that consists of a magnetic phase forming a plurality of columnar bodies whose longitudinal direction is directed in a direction perpendicular to a surface of the substrate and an insulator phase filling gaps of the columnar bodies, and the magnetic phase is amorphous and has in-plane uniaxial anisotropy of Hk2/Hk1?3 and Hk2?3.98×103 A/m when a minimal anisotropic magnetic field in a plane in parallel with the surface of the substrate is Hk1 and a maximal anisotropic magnetic field is Hk2.

Abstract: An electronic circuit module with a built-in antenna (1) includes the following elements: a mounting module having a wiring board (2), a passive component, and a semiconductor device; a resin sheet substrate (11) having an antenna pattern (12) formed on a first principle surface of a base thereof; and a magnetic layer interposed between the mounting module and the resin sheet substrate (11). These elements are housed in a case (16).

Abstract: A soft magnetic member which is formed by a composite of an organic object to satisfy a predetermined relationship with an antenna area, a circumference length, and a magnetic transmission ratio and a conductive member are provided between an antenna coil which is formed by at least one loop and a metal surface of the conductive member such as a metal casing. The magnetic flux which invades into the conductive object is blocked by the soft magnetic member and the conductive member so as to restrict the influence thereof.

Abstract: An apparatus for detection of the gradient of a magnetic field includes at least four antenna elements (11, 12, 13, 14) composed of a ferromagnetic material, which are arranged in pairs, and a bridge circuit having at least four resistance elements (1, 2, 3, 4), which are associated with the antenna elements (11, 12, 13, 14) or antenna element pairs. Each antenna element pair has at least one associated resistance element (1, 2, 3, 4) whose resistance value is dependent on the field strength and on the direction of the magnetic field, and which resistance element (1, 2, 3, 4) is arranged in a field area (19) which extends between the two antenna elements (11, 12, 13, 14) of the antenna element pair. The invention also relates to a method for production of an apparatus which is intended for detection of the gradient of a magnetic field.

Abstract: An antenna includes one or more antenna elements and a volume of material contained at least partly within a volume of the one or more antenna elements. The volume of material has at least one electromagnetic property that is different from free space. The volume of material may include dielectric material and/or ferrite material. The antenna elements may be isolated magnetic dipole (IMD) antenna elements. The electromagnetic property may be permeability and/or permittivity.

Abstract: A headset antenna and a connector for the same are provided. The headset antenna includes an audio signal line, an antenna and a high impedance element in specified application frequency ranges. The audio signal line is adapted for transmitting an audio signal and the antenna is adapted for receiving an RF signal. The high impedance element is disposed on a transmission path of the audio signal and generates a high impedance at a specified frequency band of the RF signal, so that the audio signal line is equivalent to an open circuit and the antenna obtains a better receiving capability.

Abstract: A non-contact communication antenna unit capable of implementing a thickness reduction of a mobile communication device and also suppressing a reduction in a communication range characteristic of a non-contact communication antenna even when metal components such as circuit wirings, a circuit GND, a shielding case, etc. being arranged on the inside of the mobile communication device are arranged in close vicinity to the non-contact communication antenna is provided.

Abstract: The invention relates to micro-resonant devices (MRDs) that generate resonance at radio frequencies not present in an animal or human body, or present at low, background levels in the body. These individual, often monolithic devices, can be located in three-dimensional space and tracked anywhere in a target area, e.g., in a human or animal body, or within a cell within a body, using a conventional magnetic resonance imaging (MRI) scanner or other transducers, e.g., radiofrequency transducers. The MRDs generate high sensitivity contrast in conventional clinical MRI scanners, have a diameter of anywhere from a few nanometers to 1000 microns, and can in some embodiments be manufactured using Micro-Electro-Mechanical Systems (MEMS) technology. The devices are optionally coated to isolate them from the environment, and this coating can be a biocompatible coating for medical and biotechnology uses.

Abstract: Disclosed is a flat-type antenna apparatus which has a radiating conductor and a reference conductor disposed opposite to each other and performs feeding between the radiating conductor and the reference conductor at a position offset from the center of the radiating conductor center. The antenna includes: an insulative material layer which has relative magnetic permeability greater than 1 and is placed in a gap between the radiating conductor and the reference conductor; and a short-circuiting conductor which is disposed at a position to suppress unintended excitation and enables electric conduction between the radiating conductor and the reference conductor.

Abstract: A high-impedance substrate is provided, which includes a metallic plate employed as a ground plane, a resonance circuit layer spaced away from the metallic plate by a distance “t”, the resonance circuit layer being provided with at least two resonance circuits having the same height and disposed side by side with a distance “g”, a connecting component connecting the resonance circuit with the metallic plate, and a magnetic material layer interposed between the metallic plate and the resonance circuit layer. The distance “t” between the metallic plate and the resonance circuit layer is confined within the range of 0.1 to 10 mm, the distance “g” between neighboring resonance circuits is confined within the range of 0.01 to 5 mm, the distance “h” between the magnetic material layer and the resonance circuit layer is confined within the range represented by the following inequality 1: g/2?h?t/2??inequality 1.

Abstract: An antenna apparatus includes a patch antenna unit in which a radiation conductor and a ground conductor plate are arranged so as to face each other with an insulating material disposed therebetween, a power-feed point is provided at a position slightly offset from the center of the radiation conductor, and a high-frequency electric field is supplied between the radiation conductor and the ground conductor plate; a surface-wave propagation suppression area in which a surface-wave propagation suppression mechanism for suppressing surface-wave propagation is mounted in an outer surrounding area in the offset direction of the power-feed point in which an electric-field intensity is generally maximum within the end portion of the radiation conductor plate; and an insulating area in which an electric-field intensity between the radiation conductor plate and the ground conductor plate is relatively low and the surface-wave propagation suppression mechanism is not arranged.

Abstract: A positioning, communication, and detection system designed to provide a three dimensional location of an object, navigation tools, and bidirectional surface-to-subsurface communications, and methods of using the system. The system can include one or multiple transmitters comprising electromagnetic beacons, software defined radio receivers with an associated processing unit and data acquisition system, and magnetic antennas. The system may use theoretical calculations, scale model testing, signal processing, and sensor data.

Abstract: A radio apparatus configured to deal with an electromagnetic wave at a working frequency is provided. The radio apparatus includes a radiating member of the electromagnetic wave and an isolating material having a plurality of magnetic elements. Each of the magnetic elements is arranged in such a way as to direct a longer side thereof in a direction almost perpendicular to a direction of a main polarization of the electromagnetic wave radiated by the radiating member. Each of the magnetic elements is arranged in such a way as to be placed repetitively having a space between adjacent two of the magnetic elements in almost a same direction as the direction of the main polarization.

Abstract: An antenna apparatus used in a wireless communication medium or a wireless communication medium processing apparatus constructed by a constitution of including a magnetic member in which a magnetic ceramic powder is used as a major component thereof and which is provided with flexibility, an antenna formed at a surface or inside of the magnetic member, and a matching circuit of the antenna formed at the surface or the inside of the magnetic member.

Abstract: An antenna comprising a magnetic main-path member comprising a coil wound around a magnetic core, and a magnetic sub-path member magnetically connected to the magnetic core for constituting a substantially closed magnetic path with the magnetic main-path member, the antenna meeting the relation of (S/N)1>(S/N)0, wherein (S/N)1 is a ratio of a signal voltage S obtained from the coil to a noise voltage N in this antenna, and (S/N)0 is a ratio of a signal voltage S to a noise voltage N in an antenna having the same structure except for having no magnetic sub-path member.

Abstract: An antenna unit consists of an EBG reflector, a single curl antenna supported at a central portion of the EBG reflector, and a periodic structure upper plate disposed apart from a principal surface of the EBG reflector by a predetermined distance. The EBG reflector includes a substrate having the principal surface and (Nx×Ny) square patches which are printed on the principle surface of the substrate and which are arranged in a matrix fashion (lattice structure). The periodic structure upper plate consists of a film and (Nx×Ny) square patch-like conductors printed on the film. The (Nx×Ny) square patch-like conductors are disposed so as to oppose to the (Nx×Ny) square patches, respectively.

Abstract: A communication device (310) is provided that includes a nano-sized RF antenna (100) having low power consumption and wide-range frequency spectrum based on bottom-up nanotechnology. The antenna (100) includes an insulator layer (110) positioned between a free magnetic layer (112) and a fixed magnetic layer (108). A DC voltage source (124) is coupled to the free magnetic layer (112) and the fixed magnetic layer (108) for providing a current (118) therethrough. A detector (126) is coupled between the antenna (100) and the DC voltage source (124) for detecting a change in the current (118) in response to a radiated signal being received by the antenna (100) which causes a change in the spin on electrons in the free magnetic layer (112).

Abstract: An antenna device, housed in a space of a case of an electronic equipment, the case having a surface in which an aperture is formed, includes a magnetic substance and a coil wound around the substance. The substance includes a coil winding portion and a pair of coil non-winding portions protruding from both ends of the winding portion and magnetically coupled with the winding portion. At least one of the coil non-winding portions is curved in an arc shape toward a distal end thereof from a base thereof so as to extend along an inner periphery of the space when the device is housed in the space and is viewed from the surface. The equipment further includes a circuit unit housed in the space, electrically connected to the device, and controlled on a basis of a signal inputted from the device, and a decorative plate closing the aperture.

Abstract: The present invention relates to a molded ferrite sheet having opposing surfaces and a thickness in a range of 30 ?m to 430 ?m, at least one surface of said opposing surfaces having the following surface roughness characteristics (a) to (c): (a) a center line average roughness is in a range of 170 nm to 800 nm, (b) a maximum height is in a range of 3 ?m to 10 ?m, and (c) an area occupancy rate of cross-sectional area taken along a horizontal plane at a depth of 50% of the maximum height in a square of side 100 ?m is in a range of 10 to 80%.

Abstract: A frequency conversion device, which may include a radiofrequency (RF) mixer device, includes a substrate and a ferromagnetic film disposed over a surface of the substrate. An insulator is disposed over the ferromagnetic film and at least one microstrip antenna is disposed over the insulator. The ferromagnetic film provides a non-linear response to the frequency conversion device. The frequency conversion device may be used for signal mixing and amplification. The frequency conversion device may also be used in data encryption applications.

Abstract: A coil antenna includes a magnetic core and a coil wound around a bobbin which are accommodated within a case. The magnetic core and an end of the bobbin are connected to a cap. The magnetic core and an end portion of the bobbin are covered with a foamed component, and are further covered with a gel component. The foamed component is formed by a forming process, and an adhesive compound is provided between the magnetic core and the foamed component.

Abstract: A high impedance surface (300) has a printed circuit board (302) with a first surface (314) and a second surface (316), and a continuous electrically conductive plate (319) disposed on the second surface (316) of the printed circuit board (302). A plurality of electrically conductive plates (318) is disposed on the first surface (314) of the printed circuit board (302), while a plurality of elements are also provided. Each element comprises at least one of (1) at least one multi-layer inductor (330, 331) electrically coupled between at least two of the electrically conductive plates (318) and embedded within the printed circuit board (302), and (2) at least one capacitor (320) electrically coupled between at least two of the electrically conductive plates (318).

Abstract: An antenna device is provided. The antenna device includes an antenna element including a first portion and a second portion formed almost parallel to each other, and a plane-shaped piece of magnetic material provided between the first portion and the second portion, the magnetic material arranged almost parallel to the first portion and the second portion. A wireless mobile terminal is provided. The wireless mobile terminal includes a printed circuit board, an antenna element including a first portion and a second portion formed almost parallel to each other, the first portion and the second portion arranged almost parallel to the printed circuit board each, and a plane-shaped piece of magnetic material provided between the first portion and the second portion, the magnetic material arranged almost parallel to the printed circuit board, the magnetic material arranged almost parallel to the first portion and the second portion.

Abstract: An adjustable integrated circuit antenna structure includes a plurality of antenna elements, a coupling circuit, a ground plane, and a transmission line circuit. The coupling circuit is operable to couple at least one of the plurality of antenna elements into an antenna based on an antenna structure characteristic signal, wherein the antenna has at least one of an effective length, a bandwidth, an impedance, a quality factor, and a frequency band in accordance with the antenna characteristic signal. The ground plane is proximal to the plurality of antenna elements. The transmission line circuit is coupled to provide an outbound radio frequency (RF) signal to the antenna and receive an inbound RF signal from the antenna.

Abstract: Microwave generating and detection portions of a electronic circuit is improved in efficiency and reduced in size. A microwave generating element A comprises a lower electrode 1, a layer 3 formed on the lower electrode 1 in an island shape, forming a magnetoresistance element, an insulator 7 formed on the lower electrode 1 in such a manner as to surround the layer 3 forming the magnetoresistance element, and an upper electrode 5 formed on the insulator 7 and the layer 3 forming the magnetoresistance element. The layer 3 forming the magnetoresistance element includes, in order from the side of the lower electrode 1, a magnetization fixed layer 3a, an intermediate layer 3b, and a magnetization free layer 3c. The magnetization free layer 3c, which is required to produce resonance oscillation based on a current, preferably is dimensioned to be equal to or smaller than 200 nm square in a cross-sectional area and on the order of 1 to 5 nm in film thickness, for example.

Abstract: An electromagnetic reactive edge treatment including an array of capacitively-loaded loops is disposed at or near an edge of a conductive wedge. The axes of the loops are oriented parallel to the edge of the wedge. This edge treatment may enhance or suppress the hard diffraction coefficient, depending on the resonant frequency f0) of the array of loaded loops. Diffraction of incident waves that are lower (higher) in frequency than f0 may be enhanced (suppressed) due to the increase (decrease) in effective permeability of the volume occupied by the array of loops. Applications include controlling antenna patterns, side lobe levels, and backlobe levels for antennas mounted on conductive surfaces near edges or corners.

Abstract: An antenna sheet includes a magnetic sheet composed of a resin matrix and an Fe-based amorphous alloy contained in the resin matrix, and an antenna pattern disposed directly on the magnetic sheet, the antenna pattern being composed of nanoparticles. The antenna sheet can be manufactured by forming the antenna pattern directly on the magnetic sheet using a material containing nanoparticles, and then by sintering the nanoparticles by subjecting the magnetic sheet having the antenna pattern to heat treatment.

Abstract: It is difficult to check the suitability of a radio anechoic room as a measuring environment, even when countermeasures for preventing reflection of electromagnetic waves and blocking electromagnetic waves are taken against the radio anechoic room and incidental equipment disposed therein, for example. Depending on the circumstances, measurement reliability is decreased when the measurement is taken without recognizing that these countermeasures are insufficient. Therefore, there is a demand for a device that can easily and quickly check whether a measuring environment, such as a radio anechoic room, or a measuring system is suitable for measurement.

Abstract: There is provided a chip antenna body and a method of manufacturing the same. The chip antenna body including: a plurality of minute segments formed of one of a dielectric material, a magnetic material and a mixture thereof, the minute segments arranged to be spaced apart from one another at certain intervals; and a resin filled in the intervals among the minute segments to integrally fix the minute segments.

Abstract: An antenna for a magnetic resonance unit has a number of antenna rods arranged substantially regularly around an antenna axis, and being axially oriented relative to said antenna axis. Each antenna rod has two opposite ends with a central portion therebetween. The ends of each rod are electrically connected with the ends of at least one adjacent antenna rod by connecting elements oriented tangentially relative to the antenna axis. The rods are symmetrical relative to a plane of symmetry that proceeds perpendicularly relative to the antenna axis. Each point of each antenna rod defines a radial direction with the antenna axis, and the central portion defines a reference direction with respect to the antenna axis. Each radial direction forms a tangential angle with the reference direction, which is a non-constant function of the axial spacing of each point from the central portion of that rod.

Abstract: An antenna device includes a printed circuit board and an antenna element. The printed circuit board has a face a portion of which is formed by a conductive layer overlaid with a magnetic material layer made of anisotropic magnetic material. The magnetic material layer is arranged in such a way that a hard magnetization axis of the anisotropic magnetic material is directed almost parallel to the face. The antenna element is arranged almost parallel to the printed circuit board on a side of the face. The antenna element is arranged in such a way that an antenna current distributed on the antenna element if the antenna element is excited is directed almost perpendicular to the hard magnetization axis.

Abstract: The invention relates to an enhanced mechanism for RFID reader which includes: an antenna for receiving a RFID signal transmitted from an object under test and outputting the RFID signal to the RFID reader; a metal plate disposed on an entrance of a building. The metal plate and the object under test are respectively placed on opposite sides of the antenna. The angle between the first metal plate and the second metal plate is from 30 to 180 degrees; therefore the metal plate, the antenna, and the RFID reader provide an enhanced mechanism of a RFID reader.

Abstract: An antenna includes an antenna element, and a first magnetic body which is arranged at least a part of the antenna element and has positive magnetostrictive characteristics.

Abstract: A flat miniaturized antenna includes a substrate, a radiation element, a short circuit metal arm, and a feed element. The substrate includes a first sheet and a second sheet. The first sheet is perpendicular to the second sheet. The radiation element includes a first radiation plate approximately paralleling the first sheet, a second radiation plate approximately paralleling the first sheet and extended in a direction opposite to the first radiation plate, and a third radiation plate positioned between the second radiation plate and the first sheet and perpendicular to the second radiation plate. The short circuit metal arm is installed between the first radiation plate and the first sheet. The short circuit metal arm includes a start terminal coupled to the third radiation plate and an end terminal coupled to the substrate. The feed element is used for connecting the third radiation plate to the first sheet electrically.

Abstract: The present invention relates to the production of reflectarray antennas, that is to say antennas consisting of a primary illumination source and a phase-shifting plate consisting of an array of cells each having a coefficient of reflection the phase of which is electronically controlled. According to the invention, each cell consists of a waveguide element closed at one of its ends by a dielectric substrate wafer carrying an electrical circuit formed by three parallel conducting strips. A variable capacitor, produced either in MEMS technology or by means of a ferroelectric element, is implanted by means of bonding wires on the electrical circuit etched on the substrate.

Abstract: An antenna device has a core made of a magnetic material, a coil formed by winding a conducting wire on a predetermined range including the core and the outer region of the core, and a sub-core that adjusts the resonance frequency by moving in the inner peripheral region of the coil and in the direction orthogonal to the winding direction of the coil. A communication system of the present invention is a combination of an external communication device, the antenna device, and an internal communication device that is connected to the antenna device and is disposed in a cabin.

Abstract: A broadband antenna including: a dielectric substrate; a meander line radiator formed on the dielectric substrate to be bent at an acute angle; and a stub extended from at least one of bending portions of the meander line radiator, wherein the meander line radiator has 2n number of the bending portions thereon to form an n number of turns, where n?1.

Abstract: There is provided a broadband antenna including: an insulating block having opposing first and second main surfaces and a side surface between the first and second main surfaces; a first radiator pattern formed on the first main surface and having a tapered slot with an open end; and a second radiator pattern including two patterns connected to opposing ends of the first radiator pattern, respectively, and extending to the second main surface.

Abstract: A solar panel may be modified to function both as a solar panel and as a patch antenna. The use of combination solar cell and patch antenna allows for a greater amount of the upper surface of a device to be covered with solar panels, and may reduce the size and cost of the device. The ground layer of a printed circuit board in the device may be used as the ground plane of the patch antenna, further reducing the size and cost of the device.

Abstract: Disclosed is an inductive miniature structural element, particularly an antenna. Said structural element comprises a winding member (1) which is embodied as a flat component and on which three coil windings (2X, 2Y, 2Z) are mounted in such a way that the axes of said coil windings point in the three three-dimensional directions (X, Y, Z). The winding member (1) is made at least in part of ferrite material while the top face and the bottom face thereof are provided with guiding elements (1.5, 1.6, 1.7, 1.8) for directing the third coil winding. The winding member (1) is placed on a coil plate (3) made of electrically non-conducting, non-ferromagnetic material and is connected thereto. The coil plate (3) is provided with recesses into which the guiding elements that are located on the bottom face of the winding member (1) engage.

Abstract: In a helical antenna to be installed inside a mobile communication terminal, for processing low-bandwidth signals, a substrate is made of magnetic dielectric material, a plurality of lower electrodes are disposed on the underside of the substrate, and a plurality of upper electrodes are disposed on the top of the substrate. The upper electrodes are inclined with respect to the lower electrodes, respectively, at a predetermined angle. A plurality of side electrodes electrically connect the lower electrodes with the upper electrodes, respectively. At least a part of a magnetic moment vector, which is formed around each of the lower electrodes by a current flowing in the each lower electrode, is directed in parallel with a current flowing in each of the upper electrodes corresponding to the each lower electrode.

Abstract: A core antenna system for use in electronic article surveillance (EAS) and radio frequency identification (RFID) systems. The core antenna system may include a core antenna. The core antenna may include a core, a first resonant winding disposed around at least a portion of the core, the first resonant winding having a first number of winding turns N1, and a second non-resonant winding disposed around at least a portion of the core, the second non-resonant winding having a second number of winding turns N2, the second number of turns greater than or equal to the first number of turns. The core antenna may be mounted on a shield plate and tuned to an operating frequency on the shield plate such that when the shielded core antenna is further mounted on a mounting surface, e.g., of a checkstand, no significant de-tuning of the antenna takes place.