Abstract: An array coil system includes a detector coil having a plurality of coils arranged in an array, and a plurality of resistances. Both terminals of each of the coils of the detector coil are connected to a ground or a DC voltage via associated ones of the resistances.

Abstract: A foreign object detector includes a detection coil; a transmitting circuit generating an unbalanced signal; a balanced-to-unbalanced transformer transforming the unbalanced signal supplied from the transmitting circuit to a balanced signal; and detection circuit detecting a foreign object by sensing a change in frequency characteristic of reflected power that is a power component reflected by the detection coil. The foreign object detector detects a foreign object while preventing a wire between the detection coil and the detection circuit from functioning as a linear antenna even if the wire is long.

Abstract: Disclosed herein is a foreign object detector to detect a foreign object while distinguishing metal from water. The foreign object detector includes a detection coil; a transmitting circuit generating RF power of a predetermined frequency; a directional coupler outputting the RF power supplied from the transmitting circuit to the detection coil, and extracting reflected power that is a power component reflected by the detection coil; and a detection circuit receiving the reflected power extracted by the directional coupler, and detecting the foreign object by sensing a change in the frequency characteristic of the reflected power.

Abstract: A coil unit configured to transmit or receive electric power by electromagnetic induction in a noncontact manner, including: a coil into or from both terminals of which a high-frequency voltage is input or output; a metal conductor placed near the coil; and a first capacitor and a second capacitor connected to the terminals of the coil, wherein the ratio of the capacitance between the first capacitor and the second capacitor is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.

Abstract: An array coil system includes a detector coil having a plurality of coils arranged in an array, and a plurality of resistances. Both terminals of each of the coils of the detector coil are connected to a ground or a DC voltage via associated ones of the resistances.

Abstract: The purpose of the present invention is to provide a contactless charging device which reduces magnetic field leaking from an air gap between a primary coil and a secondary coil so as to suppress radiation noise in contactless electrical power transmission. The device is provided with a power supply device (1) comprising a primary coil (13) which generates a magnetic field by way of a supply current from a power supply (2), and a power receiving device (8) comprising a secondary coil (15) which receives power by way of the magnetic field from the primary coil (13). The primary coil (13) and the secondary coil (15) are formed by winding coil wires, and the number of turns of the secondary coil (15) is set to be greater than the number of turns of the primary coil (13).

Abstract: Disclosed herein is a foreign object detector to detect a foreign object while distinguishing metal from water. The foreign object detector includes a detection coil; a transmitting circuit generating RF power of a predetermined frequency; a directional coupler outputting the RF power supplied from the transmitting circuit to the detection coil, and extracting reflected power that is a power component reflected by the detection coil; and a detection circuit receiving the reflected power extracted by the directional coupler, and detecting the foreign object by sensing a change in the frequency characteristic of the reflected power.

Abstract: A foreign object detector includes a detection coil; a transmitting circuit generating an unbalanced signal; a balanced-to-unbalanced transformer transforming the unbalanced signal supplied from the transmitting circuit to a balanced signal; and detection circuit detecting a foreign object by sensing a change in frequency characteristic of reflected power that is a power component reflected by the detection coil. The foreign object detector detects a foreign object while preventing a wire between the detection coil and the detection circuit from functioning as a linear antenna even if the wire is long.

Abstract: A coil unit configured to transmit or receive electric power by electromagnetic induction in a noncontact manner, including: a coil into or from both terminals of which a high-frequency voltage is input or output; a metal conductor placed near the coil; and a first capacitor and a second capacitor connected to the terminals of the coil, wherein the ratio of the capacitance between the first capacitor and the second capacitor is set to a value at which a current induced into the metal conductor due to capacitance coupling when a high-frequency voltage is input into or output from the coil is reduced.

Abstract: To provide an antenna device capable of diminishing gain changes caused by a human body. An antenna device has a magnetic current antenna 401 that takes a magnetic current as a source of emission; an electric current antenna 402 that takes an electric current as a source of emission; and an electric current/magnetic current distribution control circuit 403 that feeds signals to the magnetic current antenna 401 and the electric current antenna 402, wherein the magnetic current antenna 401 and the electric current antenna 402 are arranged in such a way that a polarized wave emitted from the magnetic current antenna 401 and a polarized wave emitted from the electric current antenna 402 cross each other at right angles. The electric current/magnetic current distribution control circuit 403 controls distribution of a radio wave emitted from the magnetic current antenna 401 and a radio wave emitted from the electric current antenna 402.

Abstract: In order to provide an electromagnetic induction coil unit and an electromagnetic induction device with reduced coil loss and high power transmission efficiency, and hence whose manufacturing costs are reduced, what is included is a coil (101) formed with a spiral conductor, and a magnetic partition wall (102) formed with a spiral magnetic element and disposed so as to sandwich at least a part of the spiral conductor of the coil (101).

Abstract: To provide an antenna device capable of diminishing gain changes caused by a human body. An antenna device has a magnetic current antenna 401 that takes a magnetic current as a source of emission; an electric current antenna 402 that takes an electric current as a source of emission; and an electric current/magnetic current distribution control circuit 403 that feeds signals to the magnetic current antenna 401 and the electric current antenna 402, wherein the magnetic current antenna 401 and the electric current antenna 402 are arranged in such a way that a polarized wave emitted from the magnetic current antenna 401 and a polarized wave emitted from the electric current antenna 402 cross each other at right angles. The electric current/magnetic current distribution control circuit 403 controls distribution of a radio wave emitted from the magnetic current antenna 401 and a radio wave emitted from the electric current antenna 402.

Abstract: The small loop antenna element of the antenna apparatus includes loop antenna portions that have a predetermined loop plane and radiate a first polarized wave component parallel to the loop plane, and at least one connecting conductor that is provided in a direction orthogonal to the loop plane and connects the plurality of loop plane portions to radiate a second polarized wave component orthogonal to the first polarized wave component. In the case of the antenna apparatus located adjacent to a conductor plate, by making the maximum value of the antenna gain of the first polarized wave component and the maximum value of the antenna gain of the second polarized wave component substantially identical when the distance between the antenna apparatus and the conductor plate is changed, a composite component of the first and second polarized wave components are made substantially constant regardless of the distance.

Abstract: The invention provides a SIM card IC module and a SIM card having a small antenna gain change. A SIM card 10 includes an IC module 11 including a circuit section 18 having a plurality of electronic components 16 mounted on a mounting surface 14A of a board 14, and an antenna 20 connected to the circuit section 18, and a plate-like base member 12 in which a recessed portion 22 for accommodating the circuit section 18 is provided. The antenna 20 is arranged to be substantially parallel to the mounting surface 14A, and has a three-dimensional structure arranged at a position shifted by a predetermined dimension from the mounting surface 14A along a thickness direction of the board 14.

Abstract: The invention provides a SIM card IC module and a SIM card having a small antenna gain change. A SIM card 10 includes an IC module 11 including a circuit section 18 having a plurality of electronic components 16 mounted on a mounting surface 14A of a board 14, and an antenna 20 connected to the circuit section 18, and a plate-like base member 12 in which a recessed portion 22 for accommodating the circuit section 18 is provided. The antenna 20 is arranged to be substantially parallel to the mounting surface 14A, and has a three-dimensional structure arranged at a position shifted by a predetermined dimension from the mounting surface 14A along a thickness direction of the board 14.

Abstract: The small loop antenna element of the antenna apparatus includes loop antenna portions that have a predetermined loop plane and radiate a first polarized wave component parallel to the loop plane, and at least one connecting conductor that is provided in a direction orthogonal to the loop plane and connects the plurality of loop plane portions to radiate a second polarized wave component orthogonal to the first polarized wave component. In the case of the antenna apparatus located adjacent to a conductor plate, by making the maximum value of the antenna gain of the first polarized wave component and the maximum value of the antenna gain of the second polarized wave component substantially identical when the distance between the antenna apparatus and the conductor plate is changed, a composite component of the first and second polarized wave components are made substantially constant regardless of the distance.

Abstract: It is an object of the invention to provide a contactless reader/writer comprising a transmission section for transmitting a plurality of transmission signals using carrier waves of different frequencies, a reception section for receiving a plurality of reply signals which are a response to a plurality of transmission signals transmitted by the transmission section, a phase calculation section for calculating phase data of the reply signals on the basis of the reply signals, a distance calculation section for calculating a distance to an object having returned the reply signal, on the basis of the phase data from the phase calculation section and/or a speed calculation section for calculating a frequency component of baseband signals on the basis of the baseband signals acquired from the received signal, and thereby calculating a traveling speed of an object having returned the reply signal on the basis of the frequency component, and a control section for controlling a transmission direction of the transmiss

Abstract: Two or more synchronous words are arranged to a section as long as a noise cycle “t” regarding a frame. Or, one or more synchronous words are arranged such that a section not being influenced by the noises is long enough considering the noise cycle. When information that cyclical noises occur is given and/or the noise cycle can be measured, probability that the synchronous word is influenced by the noises is reduced so that reliability of frame synchronization establishment can be improved.