Abstract: A wireless communication device includes a loop antenna that wirelessly communicates with a device of another party through an occurrence of an eddy current, a parallel inductor connected in parallel to the loop antenna, and a wireless IC element that is connected to the parallel inductor and that processes a transmission/reception signal. At least the parallel inductor and the wireless IC element provide a predetermined resonant frequency.

Abstract: An electromagnetic-coupling module including a radio IC chip and a feeder circuit board on which the radio IC chip is mounted and a feeder circuit including a resonant circuit having a predetermined resonant frequency is attached to an article. The article has a radiation element that radiates a transmission signal supplied from the feeder circuit of the electromagnetic-coupling module via electromagnetic coupling and that supplies a received reception signal to the feeder circuit via the electromagnetic coupling.

Abstract: In a coil antenna device, a multilayer structure includes non-magnetic sheets and magnetic sheets stacked on each other. A coil conductor is provided in the multilayer structure such that a portion of the magnetic material defines a magnetic core and such that a coil axis extends along a principle surface of the multilayer structure. The coil conductor includes a plurality of line conductors each of which extends on one principle surface side of the magnetic material, a plurality of line conductors each of which extends on the other principle surface side of the magnetic material, and a plurality of via-hole conductors extending in a thickness direction of the multilayer structure so as to be surrounded with the magnetic material. The plurality of via-hole conductors defines a coiled structure together with the line conductors.

Abstract: A wireless IC device includes a resin member including first and second surfaces, a substrate including first and second principal surfaces, a coil antenna provided in the resin member, and an RFIC element mounted on the substrate and connected to the coil antenna. The substrate is embedded in the resin member so that the second principal surface is at a second surface side. The coil antenna is defined by first linear conductor patterns on the second surface, first metal posts extending between the first and second surfaces, second metal posts extending between the first and second surfaces, and second linear conductor patterns on the first surface. The RFIC element is disposed in the coil antenna.

Abstract: An antenna device includes a base and a coil element that includes a coil conductor, first and second terminals respectively connected to first and second ends of the coil conductor, and third and fourth terminals extended from a secondary coil conductive portion of the coil conductor. First, second, third, and fourth electrodes and a radiating conductor are disposed on the base. The first electrode is connected to the first terminal and links to a power feed circuit. The second electrode is connected to the second terminal and links to the power feed circuit. The third electrode is connected to the third terminal. The fourth electrode is connected to the fourth terminal. The radiating conductor links to the third electrode and the fourth electrode. The coil element and the radiating conductor are magnetically coupled to a communication-partner antenna.

Abstract: A high-frequency transmission line includes an insulator as a base material, and also includes linear conductors configured to transmit signals. Through holes are provided at positions corresponding to the positions of the linear conductors. The high-frequency transmission line is arranged on a connector in a state in which the positions of the bottom ends of the through holes are respectively aligned with the positions of signal terminals provided on the connector. A conductive bonding material provided at the top ends of the through holes is fluidized when heat is applied thereto, and flows to the bottom ends of the through holes due to surface tension or capillarity. As a result, the linear conductors are electrically connected to the signal terminals respectively.

Abstract: An antenna of a communication terminal is disposed on a side on which a bottom surface of a reflective plate, which is included in a display, is present. When the reflective plate is irradiated by an LED light source, the antenna cannot be seen from the side on which a display screen of the display is disposed. Accordingly, an antenna coil of the antenna does not need transparent electrodes and can be made of various materials each having a high conductivity. Therefore, the antenna has high sensitivity, low manufacturing cost, and very efficiently performs near field communication with an external device located on the display screen side of the display.

Abstract: An inductor bridge is provided with a flexible flat plate-shaped element body, a first connector, and a second connector. The element body includes therein an inductor portion. The inductor portion is configured by a spiral conductor pattern. The first connector is provided on the element body and is connected to a first circuit. The second connector is provided on the element body and is connected to a second circuit.

Abstract: A coupling assistance device is provided with a base material having a first principal surface, and a planar antenna provided at the base material. Moreover, the first principal surface of the base material has a first region to which a coil antenna of a portable telephone terminal is to be adjacent, and a second region to which a coil antenna of an RFID tag-containing article is to be adjacent. The planar antenna is provided from the first region over to the second region of the base material, and is coupled to the antenna of the portable telephone terminal in the first region and to the antenna of the RFID tag-containing article in the second region.

Abstract: A wireless IC device including a coil antenna includes a first substrate, a first metal post, a second metal post, and a connection conductor. First conductor patterns are provided on a first principal surface of the first substrate. The first metal post and the second metal post extend in a normal direction to the first principal surface of the first substrate, and first ends thereof are connected to the first-principal-surface-side conductor patterns. A first end of second conductor pattern is connected to a second end of the first metal post, and a second end of the connection conductor is connected to a second end of the second metal post. A second end of the first-principal-surface-side conductor patterns are power supply ends.

Abstract: An antenna device includes a first conductor plane and a second conductor plane that face each other. The first conductor plane and the second conductor plane are electrically continuous through a first connection conductor, a second connection conductor, and a chip capacitor. A power feed coil is disposed between the first conductor plane and the second conductor plane. The power feed coil includes a magnetic core and a coil conductor. The coil conductor defines a pattern such that the coil conductor winds around the magnetic core. The power feed coil is disposed at a position closer to the first connection conductor and magnetically couples with the first connection conductor.

Abstract: A surface mount coil component includes an element body defining a compact including magnetic material particles; a coil that is buried, excluding an end portion of the coil, in the element body; and an input-output terminal electrically connected to the end portion of the coil. A thermoplastic resin layer is provided on a surface on a mounting surface side of the element body. An interlayer connection conductor is provided in the thermoplastic resin layer. The input-output terminal is provided on a surface of the thermoplastic resin layer and is electrically connected to the end portion of the coil via the interlayer connection conductor.

Abstract: A surface mount coil component includes an element body with a first surface, a second surface that opposes the first surface, and a third surface connecting the first surface and the second surface, the element body being defined by a compact including magnetic particles; a first conductor pattern provided at the first surface of the element body; a second conductor pattern provided at the second surface of the element body; input/output terminals provided at the third surface of the element body; and metal pins embedded in the element body, ends of each metal pin being connected to the first and second conductor patterns. The first conductor pattern, the second conductor pattern, and the metal pins define a coil conductor. The input/output terminals are defined by a pair of metal pins exposed at the third surface.

Abstract: An RFIC chip includes a first input/output terminal and a second input/output terminal and is built into a multilayer substrate. A power feeding circuit includes coil conductors and is built into the multilayer substrate. A first coil conductor includes a first coil end connected to the first input/output terminal, and a second coil conductor includes a second coil end connected to the second input/output terminal. First and second terminal electrodes are connected to one end of the first coil conductor and one end of the second coil conductor, respectively. A first coil portion is disposed in a section extending from the first coil end to the first position and a second coil portion is disposed in a section extending from the second coil end to the second position. The RFIC chip is interposed between the first coil portion and the second coil portion in a planar view of the multilayer substrate.

Abstract: A coil component manufacturing method includes embedding coils in a flat plate-shaped element body defined by a molded body including magnetic particles such that the coils are in a matrix and winding axes of the coils extend in a thickness direction of the element body, one end portion of each of the coils is exposed to one main surface of the element body, and the other end portion of each of the coils is exposed to the other main surface of the element body, forming electrode films defining input/output terminals on both main surfaces of the element body so as to make contact with one of the end portions of each of the coils, and performing segmentation into individual coil components by cutting the element body at location between the coils adjacent to each other in the thickness direction.

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: A sanitary article is equipped with a moisture-detecting RFID tag that includes a moisture-absorptive material; a moisture-detecting RFID tag adjacent to the moisture-absorptive material; and a relay antenna that is connected to the moisture-detecting RFID tag and that extends the communication range by relaying an output of the moisture-detecting RFID tag. Moreover, the moisture-detecting RFID tag includes an RFIC element, and an antenna element that is connected to the RFIC element. The moisture-detecting RFID tag outputs a variation of a communication distance or a signal intensity, originated from a variation of a moisture amount included in the moisture-absorptive material.

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 branch circuit includes a common antenna port and separates a first communication signal including a signal in a low band and a signal in a high band and a second communication signal that is a signal in a frequency band between the low band and the high band. The branch circuit includes a first-communication-signal-line-side band elimination filter and a second-communication-signal-line-side band elimination filter and SAW filter.

Abstract: A transmission line portion of a high-frequency transmission cable includes a dielectric body in which a first ground conductor, a signal conductor, and a second ground conductor are arranged along a thickness direction of the dielectric body from a first principle surface side. The second ground conductor is arranged at a position that does not overlap the signal conductor when viewed in a direction perpendicular or substantially perpendicular to the first principle surface. The third ground conductor and the signal conductor are located at the same position in the thickness direction of the dielectric body. The second and third ground conductors are connected to the first ground conductor via interlayer-connector conductors. The width of the second and third ground conductors is narrower than the width of the signal conductor, but a sum of the widths of the second and third ground conductors is larger than the width of the signal conductor.