Abstract: The invention relates to a ferrite antenna, comprising at least one winding (4), which is arranged around a core (2) consisting of ferrite material. A second core (3), consisting of ferrite material and running coaxially to the first core (2), is allocated to the first core (2), which carries the winding (4) and is rigidly fixed in the coil carrier (1). Said second core, which can be displaced in an axial direction in the same coil carrier (1), is positioned in such a way that the opposing front faces of the two cores are placed at a predetermined distance from one another. Said distance can be altered by displacing the second core (3) in an axial direction in order to tune the antenna After tuning, the second core (3) can be fixed in or on the coil carrier (1).

Abstract: An surface-mount type antenna includes a rectangular parallelepiped base body, a feeding terminal formed at one-end-side part of one side surface thereof, and a radiating electrode, to one end of which is connected the feeding terminal, disposed such that its other end is routed from one-end-side part of one side surface, through one-end-side part of one principal surface, to another-end-side part of one principal surface, and extends from the other-end-side part to the one end side part parallelly with a ridge of the base body, and is eventually formed into an open end. An antenna apparatus is constructed by mounting the surface-mount type antenna on a mounting substrate having a feeding electrode and a ground conductor layer with a linear side edge located near the feeding electrode, with the ridge of the base body arranged parallel to the linear side edge of the ground conductor layer.

Abstract: An antenna (100) includes at least one antenna radiating element (108, 110) and a dielectric structure (102) defining a cavity containing a fluid dielectric (106). The dielectric structure (102) can be a dielectric circuit board substrate with a ground plane (116) provided opposed to the antenna radiating elements (108, 110). The fluid dielectric (106) is electrically and magnetically coupled to the antenna radiating element. Further, a composition processor (301) is provided for selectively varying a composition of the fluid dielectric (106) so as to dynamically change an electrical characteristic of the antenna radiating element (108) in response to a control signal.

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: 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: The specification discloses a printed circuit board (PCB) based ferrite core antenna. The traces of PCBs form the windings for the antenna, and various layers of the PCB hold a ferrite core for the windings in place. The specification further discloses use of such PCB based ferrite core antennas in downhole electromagnetic wave resistivity tools such that azimuthally sensitivity resistivity readings may be taken, and borehole imaging can be performed, even in oil-based drilling fluids.

Abstract: A micro-electromagnetic device is formed by providing internal channels in a ceramic housing sintered from ceramic materials with high dielectric strength and infiltrating these channels with molten metal. The invention allows the fabrication of arrays of ceramic embedded micro-electromagnetic devices as well as ceramic embedded helical micro-antennas designed for use in the high GHz and THz regions at a fraction of the present cost of manufacturing of such devices and with virtually no restriction to their miniaturization.

Abstract: A tunable ferroelectric component and a narrowband resonant circuit for measuring the loss of the ferroelectric component. The ferroelectric component may be a capacitor integrated in the resonant circuit. The testing method eliminates other sources of loss to isolate the loss due to the ferroelectric material and to demonstrate that this loss is low.

Abstract: A reception antenna is formed of a column-profiled ferrite core and three antenna coils, each of which is formed by winding electric wire around the core. Each central axis of the three antenna coils is mutually disposed orthogonally at a barycenter of the core. Each of the three antenna coils is symmetrical with respect to the barycenter. A third antenna coil and each of a first antenna coil and a second antenna coil are overlapped with a space. The first antenna coil and the second antenna coil are overlapped with direct contact, where a starting end of the second antenna and a terminating end (outward end) of the first antenna is connected.

Abstract: The invention subject of this specification utilizes the technique of inductive magnetic coupling of Electromagnetic waves to EM barrier materials in combination with transmission of Electromagnetic waves through non-permeable material to facilitate the measurement of resistivity of geologic formation beyond the well casing.

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: The invention relates to antenna configurations for electromagnetic logging tools. The antennas have one or more electrical conductors disposed on a dielectric core. The conductor is formed on the core through plating or deposition processes and arranged such that the antenna has a first magnetic dipole moment substantially perpendicular to a longitudinal axis of the core. One embodiment includes an antenna adapted for mutual balancing using interleaved conductive paths or disks to alter the magnetic dipole moment to mutually balance the antenna system. The invention also relates to a method for producing such antenna structures.

Abstract: A communication device having a long communication range by greatly suppressing the attenuation of the magnetic flux because of a conductive member even if the communication device is installed near the conductive member such as of metal. Its installation structure, manufacturing method, and communication method are also disclosed. An RFID tag (1a) serving as a communication device (12) is characterized in that an amorphous magnetic sheet (5) extends from a magnetic flux generation portion (A) of a concentric display antenna coil (2a) of the RFID tag (1a) toward the outside of the antenna coil (2a).

Abstract: An ultra-wideband magnetic antenna includes a planar conductor having a first and a second slot about an axis. The slots are substantially leaf-shaped having a varying width along the axis. The slots are interconnected along the axis. A cross polarized antenna system is comprised of an ultra-wideband magnetic antenna and an ultra-wideband dipole antenna. The magnetic antenna and the dipole antenna are positioned substantially close to each other and they create a cross polarized field pattern. The present invention provides isolation between a transmitter and a receiver in an ultra-wideband system. Additionally, the present invention allows isolation among radiating elements in an array antenna system.

Abstract: A loop antenna system. The loop antenna system for a wireless transmission device having a signal end and a ground end, includes a loop antenna having a toroidal helix wire with a first end coupled to the signal end and a second end coupled to the ground end.

Abstract: An antenna device includes a door handle provided inside of a vehicle door for opening the vehicle door, and an antenna provided inside of the door handle and generating a magnetic field component in a direction different from a perpendicular direction to an outer surface of the vehicle door.

Abstract: An antenna for a transponder comprises a magnetic core composed of layered amorphous metallic thin plates or composite plates of soft magnetic flakes and a synthetic resin, and a coil wound on the magnetic core. A transponder comprises two antennas set forth above, and a spiral antenna.

Abstract: A direction-finding antenna that conforms to flat and semi-flat surfaces is disclosed. It has a low profile in comparison to most existing direction-finding antennas and its surfaces are shaped so that reduced radar reflections and reduced radar cross sections of the antenna assembly are achieved. The antenna assembly has direction-finding characteristics that are essentially equivalent to traditional antennas that have high profiles and that are mounted high and away from external surfaces of platforms for unobstructed views of arriving electromagnetic energy and away from reflected electromagnetic waves and reradiators.

Abstract: A receiving antenna is formed by disposing two ferrite chip antenna elements adjacently to each other. The two ferrite chip antenna elements are disposed in combination so that a magnetic flux passing through the central axis of one of the ferrite chip antenna elements does not pass through that of the other of the ferrite chip antenna elements. Herein, the two ferrite chip antenna elements are disposed in combination so as to intersect each other substantially at right angles in a state in which one end portion of one of the ferrite chip antenna elements is opposed to a side surface portion of the other of the ferrite chip antenna elements.

Abstract: A direction-finding antenna that conforms to flat and semi-flat surfaces is disclosed. It has a low profile in comparison to most existing direction-finding antennas and its surfaces are shaped so that reduced radar reflections and reduced radar cross sections of the antenna assembly are achieved. The antenna assembly has direction-finding characteristics that are essentially equivalent to traditional antennas that have high profiles and that are mounted high and away from external surfaces of platforms for unobstructed views of arriving electromagnetic energy and away from reflected electromagnetic waves and reradiators.

Abstract: The invention relates to a sensor of the type that comprises a system of co-localized antennae, itself comprising at least two active antennae (1) with the same phase center, said antennae being placed at the top end of a mast (4) and connected to down conductors (3). According to the invention, said mast (4) is produced from a dielectric material in such a way as to enable the antennae to be decoupled. The sensor also has filtering means (51 to 5n) which are arranged on at least one of said down conductors.

Abstract: Low-pass filter for a diplexer in an ADSL communications system comprising a low-pass filter (8) with chokes (9). Said chokes (9) have magnetic cores made of an alloy, especially a nanocristalline or amorphous alloy.

Abstract: A ferrite core antenna having two spaced signal pick-up coils coupled through a transformer so that the signals from the two coils are additively combined in the primary of the transformer. A variable capacitor connected to the two coils tunes the antenna to selected frequencies. This results in amplification of the signal.

Abstract: An apparatus includes an object and one or more sensors located adjacent to or in the object. The object is formed of a material whose dielectric constant or magnetic permeability has a negative real part at microwave-frequencies. The one or more sensors are located adjacent to or in the object and measure an intensity of an electric or a magnetic field therein.

Abstract: A method and system for improving the quality of reception of communications via cellular telephone headset in which the lead between the cellular telephone handset and the speaker associated with the headset are shielded by a radiation absorbing material thereby reducing interference from electromagnetic emissions in the atmosphere to which the lead is exposed. The conventional electrical connections between the cellular telephone handset and the speaker associated with the headset are desirably coated with a ferrite powder held in place by a suitable conventional wrap and flexible waterproof covering.

Abstract: An antenna unit includes a substrate having an antenna device and a radio absorbing device. The antenna device, substrate and radio absorbing device are constructed of a patch device, a conductive material and ferrite, respectively. The radio absorbing device is attached to the rear surface of the substrate. The radio absorbing device reduces incoming radio wave signals to travel to the rear surface of the substrate due to reflections by surrounding metal parts.

Abstract: An active phased array antenna according to the present invention comprises plural antenna patches 106a-106p which are arrayed in matrix on a dielectric substrate at equal intervals in the row and column directions, a grounded feeding terminal 108 which is applied with high-frequency electric power, a first control voltage generating means 111 which generates a row-direction orientation control voltage, and a second control voltage generating means 112 which generates a column-direction orientation control voltage. The plural antenna patches 106 are connected to the feeding terminal 108 by feeding lines 121, branching off from the feeding terminal 108 respectively, and plurally provided phase shifters 107 are arranged constituting a part of the feeding lines 121. In the so-constructed active phased array antenna, a low-cost active phased array antenna which is of a simpler structure and capable of continuously changing antenna orientation characteristics can be realized.

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: 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: A tunable antenna matching circuit is provided. The matching circuit includes a ferro-electric tunable component. A control signal is applied to the tunable component, changing the component's impedance. This changes the impedance of the matching circuit.

Abstract: An inverted-F ferroelectric antenna is provided. The antenna comprises a counterpoise, or groundplane, and an inverted-F structure radiator having a first end connected to the counterpoise. A fixed dielectric material, typically a ceramic or air separates the radiator and the counterpoise. A capacitor, formed from a ferroelectric dielectric is connected 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: A class of antennas that comprise an electrically conductive fractal pattern disposed on a dielectric substrate and are capable of construction in a size measured in centimeters as compared to previous antennas of the same class that measured in meters. One antenna style has a ground plane that is perpendicular to the substrate and another style has a ground plane that is parallel to the substrate. The substrate has a dielectric constant of in the range of about 10 to 600 or more and may be a ferroelectric, such as barium strontium titanate. A bias voltage applied across the substrate can tune the antenna for operation in a particular frequency range. The antenna can be made especially wideband by placing an absorbing material behind the substrate. The fractal pattern may be any fractal pattern, such as Hilbert curve, Koch curve, Sierpinski gasket and Sierpinski carpet.

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 portable telephone includes a portable telephone body made from plastic having a receiver, a transmitter, and dial keys, and a chip antenna which is mounted on a circuit board secured at the inside of the portable telephone body and which is electrically connected to an RF section provided on the circuit board in the portable telephone. The chip antenna is disposed near the transmitter at a location where a transmitted electromagnetic signal is unlikely to be affected by the body of a person who is holding the portable telephone.

Abstract: The communication facility for system for low frequency communication by electromagnetic coupling, comprises at least one electromagnetic field transmitting and/or receiving antenna in the form of a coil (2) disposed on a substrate board (1) serving as support, this board having a certain thickness. The coil has turns which are wound in the thickness of the substrate board so that the sensitivity of the antenna can be improved without increasing the thickness of the communication facility.

Abstract: The present invention relates to a method and apparatus for obtaining measurements of induced resistivity of objects from spaces such as within a down-hole hydrocarbon production well. The invention also relates to measuring the location or direction of objects based upon measured responses from objects engaged or impinges by one or more transmitted signals having different phase and directional orientation. The invention relates to generating at least one signal or wave and transmitting it through a plurality of different materials that may have varying properties of density, magnetic permeability and dielectric that may each emit a separate signal with altered phase and directional orientation. When used with electromagnetic signals, the resistivity of an object or media can provide useful information regarding the composition and the location of object or media.

Abstract: A transmission line phase shifter includes a substrate, and first and second conductive portions adjacent the substrate with a gap therebetween. The first and second conductive portions define a signal path. A body is in the gap and includes a phase shifting material having a controllable dielectric constant for causing a phase shift of a signal through the signal path. The body has an enlarged width medial portion tapering downwards in width towards respective end portions for impedance matching with the first and second conductive portions. The width of the tapered end portions of the phase shifting material body are selected so that a separate impedance matching network is not required for impedance matching with the first and second conductive portions.

Abstract: A radio unit for computer systems for receiving and/or presenting data information transmitted within a commercial broadcast band and methods of manufacturing and using the same. The radio unit comprises an integrated antenna system, a first radio receiver, and an interface system for removably connecting the radio unit to a computer system. The integrated antenna system includes a first set of windings, a second set of windings, and a ferrite core with a first region and a second region. To reduce parasitic capacitance among the windings, the first set of windings are wound substantially in a first direction about a circumference of the first region, and the second set of windings are wound substantially in a second direction, substantially opposite said first direction, about a circumference of the second region and are coupled with the first set of windings at a junction between the first region and the second region.

Abstract: An ultra-wideband magnetic antenna includes a planar conductor having a first and a second slot about an axis. The slots are substantially leaf-shaped having a varying width along the axis. The slots are interconnected along the axis. A cross polarized antenna system is comprised of an ultra-wideband magnetic antenna and an ultra-wideband dipole antenna. The magnetic antenna and the dipole antenna are positioned substantially close to each other and they create a cross polarized field pattern. The present invention provides isolation between a transmitter and a receiver in an ultra-wideband system. Additionally, the present invention allows isolation among radiating elements in an array antenna system.

Abstract: A radio unit for computer systems for receiving and/or presenting data information transmitted within a commercial broadcast band and methods of manufacturing and using the same. The radio unit comprises an integrated antenna system, a first radio receiver, and an interface system for removably connecting the radio unit to a computer system. The integrated antenna system includes a first set of windings, a second set of windings, and a ferrite core with a first region and a second region. To reduce parasitic capacitance among the windings, the first set of windings are wound substantially in a first direction about a circumference of the first region, and the second set of windings are wound substantially in a second direction, substantially opposite said first direction, about a circumference of the second region and are coupled with the first set of windings at a junction between the first region and the second region.

Abstract: A bar antenna includes a single body ferromagnetic substance core, a bobbin which accommodates the core in a hollow space and has a plurality of coil windings, a case in which is positioned the core and the bobbin, and a potting material in the case and/or the bobbin. The potting material isolates the core from temperature changes, humidity changes and vibration.

Abstract: The present invention relates to a method and apparatus for obtaining measurements of induced resistivity of objects from confined spaces such as within the confined space of a down-hole hydrocarbon production well. It is well known that measuring the resistivity of an object or media can provide useful information regarding the composition and the location of object or media. The present invention utilizes the principles of Magnetic Antenna™ and Magnetic Lensing™ to obtain information regarding the location and properties of the target object.

Abstract: A ferrite core antenna having two spaced signal pick-up coils coupled through a transformer so that the signals from the two coils are additively combined in the primary of the transformer. A variable capacitor connected to the two coils tunes the antenna to selected frequencies. This results in amplification of the signal.

Abstract: A multilayer tunable ferroelectric antenna assembly which includes a first laminar structure that includes a tunable ferroelectric substrate positioned on top of a conducting ground plane and a copper radiating sheet on the other side of the substrate. A second laminar structure includes a single-sided copper cladded high dielectric substrate with the copper sheet acting as the radiator. The passive second laminar structure is electromagnetically coupled to the first laminar structure via an air-gap spacing. Application of a bias voltage across the first laminar structure changes the dielectric permittivity and, hence, the resonating frequency of the antenna structure.

Abstract: An antenna structure may be formed by arranging a current-restricting structure upon a conductive surface. The current-restricting structure may be formed from a ferrite material, and may be in forms including a belt, tiles, or a patterned deposited layer. The conductive surface may be associated with a vehicle or structure. The current-restricting structure alters the paths taken by current on or beneath the conductive surface when a voltage is applied between portions of the surface.

Abstract: A multilayer tunable ferroelectric antenna assembly that includes two superimposed substrate layers. A first substrate layer consists of a low dielectric material carrying on one face an electrically ground plane, and on its opposite face an electrically conductive patch serving as an active feeder-resonator. A second substrate includes a ferroelectric material having one face positioned on top of the feeder-resonator and carrying on the opposite face an electrically conductive patch acting as a director. The upper director patch is fed through capacitve coupling of energy from the feeder-resonator. Application of bias voltage between the director and the feeder-resonator changes the permittivity of the ferroelectric substrate, thereby causing a shift in resonance frequency. A radiation null, corresponding to energy absorption, could be tuned into the resonance frequency at which the antenna is previously exhibiting a radiation characteristic.

Abstract: A beam steerer for steering a microwave beam comprises a body of magnetic material having an aperture and magnetic coils for applying a gradient of magnetization across the aperture. Tapered slots extending from the magnetic coils towards a central region of the aperture are filled with a material having a lower magnetic permeability than the magnetic material of the body. Lower reluctance paths available through the central region of the aperture allow more magnetic flux from the magnetic coils to penetrate through the central region than would be the case in a body of uniform material composition.

Abstract: A method and a device are disclosed for the generation of a surface, the reflection phase gradient or transmission phase gradient of which will be varied by means of a controllable static electric field. The present solution takes into account, instead of mainly the transmissive properties, also the reflection properties of an arrangement comprising a ferroelectric material. Such a reflecting surface may contribute to an entire antenna aperture, a portion of an antenna aperture or an element in a conventional array aperture. In a general case N lobes and M nulls are to be controlled at the same time. In such case the surface will preferably be designed as a curved surface, for instance a rotation symmetric parabola, while in other cases the reflector element may be designed just as a plane mirror. An antenna comprising such a reflector element of ferroelectric material can also form a polarization twisting Cassegrain antenna with a flat or curved main reflector element.

Abstract: A system and method for changing an emission pattern of a concave phased array antenna where a ferroelectric material having voltage variable dielectric constant is used as a substrate for a concave radiation surface, and phase delays can be induced by changing voltages applied across the ferroelectric material.

Abstract: A dielectric slab is arranged on one surface of a ground plane to form a transmission guide for transmitting an electromagnetic wave along the surface from one end to the other end between the dielectric slab and the ground plane. A perturbation is loaded on the dielectric slab to leak the electromagnetic wave from the surface of the dielectric slab. A feed supplies an electromagnetic wave to one end of the transmission guide formed by the ground plane and dielectric slab. A dielectric layer is interposed between the ground plane and the dielectric slab, and has a lower permittivity than that of the dielectric slab.