Abstract: A signal line includes a first line portion at a first layer level and a second line portion at a second layer level, which are connected by a first interlayer connection. A first ground portion at the first layer level includes end portions closer to the first line portion than an intermediate portion, and a second ground portion at the second layer level includes end portions closer to the second line portion than an intermediate portion. A second interlayer connection connects one of the end portions of the first ground portion and one of the end portions of the second ground portion. A distance between the first and second interlayer connections is less than a distance between the first line portion and the intermediate portion of the first ground portion and is less than a distance between the second line portion and the intermediate portion of the second ground portion.

Abstract: A high-frequency signal line includes a body with a first layer level and a second layer level; a signal line including a first line portion provided at the first layer level, a second line portion provided at the second layer level, and a first interlayer connection connecting the first line portion and the second line portion; a first ground conductor including a first ground portion provided at the first layer level; a second ground conductor including a second ground portion provided at the second layer level; and a second interlayer connection connecting the first ground portion and the second ground portion. A distance between the first interlayer connection and the second interlayer connection is not less than a maximum distance between the first line portion and the first ground portion and is not less than a maximum distance between the second line portion and the second ground portion.

Abstract: A flat cable high-frequency filter includes a dielectric substrate extending in a transmission direction of a high-frequency signal. The dielectric substrate includes dielectric layers stacked on each other. Elongated conductor patterns are provided on a flat surface of one dielectric layer which faces another dielectric layer. The conductor patterns are as wide as possible in the dielectric substrate in accordance with a desired inductance. A capacitive coupling conductor pattern opposes one conductor pattern by a predetermined area with a dielectric layer therebetween. By using a connecting conductor, the capacitive coupling conductor pattern is connected to the conductor pattern which does not oppose the capacitive coupling conductor pattern.

Abstract: A transmission line portion of a flat cable includes first regions and second regions connected alternately. In the first region, the transmission line portion is a flexible tri-plate transmission line including a dielectric element including a signal conductor, a first ground conductor including opening portions, and a second ground conductor which is a solidly filled conductor. In the second region, the transmission line portion is a hard tri-plate transmission line including a wide dielectric element including a meandering conductor, and a first ground conductor and a second ground conductor which are solidly filled conductors. A variation width of the characteristic impedance in the second region is larger than a variation width of the characteristic impedance in the first region.

Abstract: A signal line conductor extends in a direction in which a signal propagates, and a dielectric, surrounding the signal line conductor, also extends in the direction in which the signal propagates. Conductive films that define and function as a ground conductor extend on a side surface of the dielectric in the direction in which the signal propagates. Furthermore, conductive films that define and function as a bridge conductor extend on a side surface of the dielectric in a direction across the direction in which the signal propagates, and thus connect the conductive films to each other.

Abstract: A high-frequency signal transmission line includes a body; a signal line including a first line portion provided to a first layer of the body, a second line portion provided to a second layer of the body alternately being connected; and a first ground conductor provided to the first layer or a third layer positioned on an opposite side of the second layer relative to the first layer, and also overlaid with a plurality of second line portions in planar view from a normal direction of a principal surface of the body, and also not overlaid with a plurality of the first line portions. A property impedance of the first line portion and a property impedance of the second line portion are different from each other.

Abstract: An electrical element includes a flexible antenna and a rigid member higher in rigidity than the flexible antenna. At least one of the flexible antenna and the rigid member is made of thermoplastic resin. A conductor pattern defining at least a portion of a section that performs the main function of the electrical element is provided at the flexible antenna. No conductor pattern that performs the main function of the electrical element is provided at the rigid member. Opposing surfaces of the flexible antenna and the rigid member are directly joined to each other.

Abstract: A radio IC device includes an electromagnetic coupling module includes a radio IC chip arranged to process transmitted and received signals and a feed circuit board including an inductance element. The feed circuit board includes an external electrode electromagnetically coupled to the feed circuit, and the external electrode is electrically connected to a shielding case or a wiring cable. The shielding case or the wiring cable functions as a radiation plate. The radio IC chip is operated by a signal received by the shielding case or the wiring, and the answer signal from the radio IC chip is radiated from the shielding case or the wiring cable to the outside. A metal component functions as the radiation plate, and the metal component may be a ground electrode disposed on the printed wiring board.

Abstract: A transmission line portion of a flat cable includes first regions and second regions connected alternately. In the first region, the transmission line portion is a flexible tri-plate transmission line including a dielectric element including a signal conductor, a first ground conductor including opening portions, and a second ground conductor which is a solidly filled conductor. In the second region, the transmission line portion is a hard tri-plate transmission line including a wide dielectric element including a meandering conductor, and a first ground conductor and a second ground conductor which are solidly filled conductors. A variation width of the characteristic impedance in the second region is larger than a variation width of the characteristic impedance in the first region.

Abstract: A high-frequency signal transmission line includes a body; a signal line including a first line portion provided to a first layer of the body, a second line portion provided to a second layer of the body alternately being connected; and a first ground conductor provided to the first layer or a third layer positioned on an opposite side of the second layer relative to the first layer, and also overlaid with a plurality of second line portions in planar view from a normal direction of a principal surface of the body, and also not overlaid with a plurality of the first line portions. A property impedance of the first line portion and a property impedance of the second line portion are different from each other.

Abstract: A first structural material is bonded to a second structural material with a joining material provided with a mixed layer of a raw-material component for forming an intermetallic compound layer and a resin component that softens and flows during heat treatment interposed therebetween to form bonded structural materials. When the bonded structural materials are heat-treated, the first structural material is joined to the second structural material with an intermetallic compound layer, and the resin component exudes and covers the lateral circumferential (exposed) portion of the intermetallic compound layer with a resin film.

Abstract: A radio IC device includes an electromagnetic coupling module includes a radio IC chip arranged to process transmitted and received signals and a feed circuit board including an inductance element. The feed circuit board includes an external electrode electromagnetically coupled to the feed circuit, and the external electrode is electrically connected to a shielding case or a wiring cable. The shielding case or the wiring cable functions as a radiation plate. The radio IC chip is operated by a signal received by the shielding case or the wiring, and the answer signal from the radio IC chip is radiated from the shielding case or the wiring cable to the outside. A metal component functions as the radiation plate, and the metal component may be a ground electrode disposed on the printed wiring board.

Abstract: An antenna device that includes a coil antenna with a coil conductor wound around a winding axis. The device further includes a planar conductor with a surface and an edge end portion, where the surface extends in the direction of the winding axis and the edge end portion is adjacent to a coil opening of the coil conductor. A booster antenna is also provided and includes a looped or spiral coil conductor and is coupled to the planar conductor and/or the coil antenna.

Abstract: An antenna device that includes a planar conductor with a first side and a second side. The antenna device includes multiple coil antennas that each includes a coil conductor wound around a winding axis that extends in a direction of the planar conductor. Moreover, two or more of the coil antennas have respective coil openings positioned adjacent to the first side of the planar conductor.

Abstract: A high-frequency signal line includes a base layer including first and second principal surfaces, a signal line provided on the first principal surface, a ground conductor provided on the first principal surface along the signal line, and a plurality of high-permittivity portions arranged along the signal line and in contact with a portion of both the signal line and the ground conductor, each of the high-permittivity portions having a higher specific permittivity than the base layer.

Abstract: An antenna device that includes coil antennas each having a coil conductor wound around a winding axis and a planar conductor including a surface and an edge end portion, the surface extending along the winding axis of the coil conductor, the edge end portion being adjacent to a coil opening of the coil conductor. A current flowing through the coil conductor induces a current in the planar conductor, this current produces a magnetic flux in a direction normal to the planar conductor, and thus the planar conductor acts as a booster antenna. The antenna device has directivity in the direction normal to the planar conductor because the magnetic flux produced by the coil antennas and that produced by the planar conductor are combined. This enables the antenna device to occupy a small area while achieving a predetermined communication distance.

Abstract: A camera module includes a lens and an image sensor that converts an image formed by the lens into an electrical signal. The camera module is disposed such that the lens is exposed from an opening in a metal housing. A feeding coil to which a feeding circuit is directly or indirectly connected, is disposed, for example, in a space between the image sensor and the lens in a direction of an optical axis of the lens. The feeding coil is coupled to the metal housing by a magnetic field, so that the metal housing defines and functions as a radiating element for communication.

Abstract: An accessory device to be mounted on a main device is provided with a wireless IC device. The main device is provided with a reader/writer that is an interrogator that communicates with the wireless IC device of the accessory device. When the accessory device is mounted on or about to be mounted on the main device, the reader/writer selects two or more frequencies in a frequency band in which an authentic wireless IC device can communicate to perform communication with the wireless IC device. With this configuration, even if the identification code written in an RFID tag is read and the RFID tag is duplicated, the duplicated RFID tag can be accurately and effectively determined as being counterfeit.

Abstract: An accessory device to be mounted on a main device is provided with a wireless IC device. The main device is provided with a reader/writer that is an interrogator that communicates with the wireless IC device of the accessory device. When the accessory device is mounted on or about to be mounted on the main device, the reader/writer selects two or more frequencies in a frequency band in which an authentic wireless IC device can communicate to perform communication with the wireless IC device. With this configuration, even if the identification code written in an RFID tag is read and the RFID tag is duplicated, the duplicated RFID tag can be accurately and effectively determined as being counterfeit.

Abstract: An antenna device includes an antenna coil including a first conductive pattern disposed on a first major surface of a magnetic sheet, a second conductive pattern disposed on a first major surface of a non-magnetic sheet, and an interlayer conductor connecting the first conductive pattern and second conductive pattern. The antenna coil including the first conductive pattern and second conductive pattern defines a spiral or substantially spiral pattern. The antenna device is a resin multilayer structure in which its base body is a laminate of the magnetic layer and non-magnetic layer and the predetermined patterns are disposed inside and outside the laminate.