Abstract: A microstrip antenna includes a first metal layer that constitutes an antenna element, a second metal layer that constitutes a ground, and a flexible member that separates the first metal layer and the second metal layer by a predetermined distance. The first metal layer and the second metal layer each are made of a metal or a metal foil. At least one of the first metal layer and the second metal layer is not adhered to the flexible member but is in close contact with the flexible member by a close contact unit. The close contact unit is a clamping mechanism including a first plate, a second plate, and a connecting member. The first plate and the second plate are connected to each other by the connecting member. The connecting member is an elastic body.

Abstract: A mobile terminal is provided with a housing, a circuit board included in the housing and having a thickness direction normal to a plane of the circuit board, a battery pack included in the housing, and a non-contact charging module included in the housing. The non-contact charging module includes a charging coil formed of a wound conducting wire; a communication coil arranged adjacent to the charging coil; and a magnetic sheet on which the charging coil and the communication coil are arranged. The magnetic sheet has four edges that collectively define a rectangular profile of the magnetic sheet, and at most three pairs of adjacent edges respectively meet to form at most three corners. At least a portion of the non-contact charging module overlaps with the circuit board as viewed in the thickness direction of the circuit board.

Abstract: A mobile terminal is provided with a housing, a circuit board included in the housing and having a thickness direction normal to a plane of the circuit board, a battery pack included in the housing, and a non-contact charging module included in the housing. The non-contact charging module includes a charging coil formed of a wound conducting wire; a communication coil arranged adjacent to the charging coil; and a magnetic sheet on which the charging coil and the communication coil are arranged. The magnetic sheet has four edges that collectively define a rectangular profile of the magnetic sheet, and at most three pairs of adjacent edges respectively meet to form at most three corners. At least a portion of the non-contact charging module overlaps with the circuit board as viewed in the thickness direction of the circuit board.

Abstract: A power receiving device is disposed underwater. The power receiving device includes a housing formed of a weak magnetic material, a ferromagnetic body that surrounds an outer side of the housing and is formed of a ferromagnetic material, and a power receiving coil wound around an outer side of the ferromagnetic body.

Abstract: A power transmitting device transmits power to a power receiving device having a power receiving coil in water. The power transmitting device includes a power transmitting coil configured to transmit the power to the power receiving coil via a magnetic field. The power transmitting device also includes a support member that supports the power transmitting coil, and one or more spacers that hold the transmitting coil and the support member.

Abstract: A wireless power transmitter includes an antenna that transmits a radio wave, a phase shift circuit that changes a phase of the radio wave transmitted from the antenna, a control device that controls the phase shift circuit, and a backscatter signal receiver that receives a backscatter signal. The control device executes phase optimization processing of controlling the phase shift circuit so that a strength of the backscatter signal received by the wireless power transmitter is maximized.

Abstract: A wearable terminal includes a support body, an antenna having a first metal layer and a second metal layer, a board, and a covering film. The first metal layer constitutes an antenna element and the second metal layer constitutes a ground. The first metal layer and the second metal layer each are made of a metal having flexibility or a metal foil formed on a material having flexibility. The first metal layer is bonded to the covering film. The support body or the antenna includes a cushion member. The cushion member is sandwiched between the first metal layer and the second metal layer. The covering film is bonded to the support body. A composite of the second metal layer and the board is not bonded to the cushion member.

Abstract: A microstrip antenna includes a first metal layer that constitutes an antenna element, a second metal layer that constitutes a ground, and a flexible member that separates the first metal layer and the second metal layer by a predetermined distance. The first metal layer and the second metal layer each are made of a metal or a metal foil. At least one of the first metal layer and the second metal layer is not adhered to the flexible member but is in close contact with the flexible member by a close contact unit. The close contact unit is a clamping mechanism including a first plate, a second plate, and a connecting member. The first plate and the second plate are connected to each other by the connecting member. The connecting member is an elastic body.

Abstract: A power receiving device is disposed underwater. The power receiving device includes a housing formed of a weak magnetic material, a ferromagnetic body that surrounds an outer side of the housing and is formed of a ferromagnetic material, and a power receiving coil wound around an outer side of the ferromagnetic body.

Abstract: An electric power transmission device transmits electric power to an electric power reception device including an electric power reception coil in water. The electric power transmission device includes one or more transmission coils which include an electric power transmission coil configured to transmit electric power to the electric power reception coil via a magnetic field, an electric power transmitter, configured to transmit AC power to the electric power transmission coil, a capacitor which is connected to the transmission coil and forms a resonance circuit which resonates with the transmission coil, a first tubular member which is waterproof and seals a periphery of the transmission coil, a second tubular member which surrounds the first tubular member and includes a plurality of holes, and an adjuster, configured to adjust an amount of air in a gap between the first tubular member and the second tubular member.

Abstract: An underwater communication device is provided and adapted to communicate data in water with another underwater communication device including another coil. The underwater communication device includes a first coil configured to transmit data to and from the other coil via a magnetic field, a second coil configured to transmit the data to and from the other coil via a magnetic field, and a supply unit configured to supply the data to at least one of the first coil and the second coil. A coil surface of the first coil and a coil surface of the second coil overlap each other.

Abstract: A power transmitting device transmits power to a power receiving device having a power receiving coil in water. The power transmitting device includes a power transmitting coil configured to transmit the power to the power receiving coil via a magnetic field. The power transmitting device also includes a support member that supports the power transmitting coil, and one or more spacers that hold the transmitting coil and the support member.

Abstract: A coil module is disposed inside an electronic apparatus and receives prescribed power. The coil module includes a loop coil, a plate-like magnetic body that is disposed on the loop coil, and a conductive member that has prescribed conductivity and is disposed parallel with the plate-like magnetic body and on a surface, opposite to a surface on which the loop coil is disposed, of the magnetic body. The conductive member projects outward relative to at least a portion of a circumferential surface of the magnetic body.

Abstract: A power transmitting device transmits power to a power receiving device having a power receiving coil, in water. The power transmitting device includes one or more annular transmitting coils including a power transmitting coil configured to transmit the power to the power receiving coil via a magnetic field, a support member located in an inner space of the transmitting coil, which is formed by the annular transmitting coil, the support member including an outer periphery along an inner periphery of the annular transmitting coil, and supporting the transmitting coil from the inner space, a power transmitting unit configured to supply A/C power to the power transmitting coil, and a capacitor connected to the transmitting coil, and forming a resonance circuit resonating together with the transmitting coil.

Abstract: A transmission coil configured to transmit electric power in water includes an annular electric wire through which an alternating current flows, and a first cover which includes non-conductive resin or non-magnetic resin and seals a periphery of the electric wire. The electric wire transmits the electric power via a magnetic field generated by flowing of the alternating current. The first cover includes a second cover which surrounds an outer peripheral surface of the electric wire in a radial direction with the non-conductive resin or the non-magnetic resin, and a self-bonding tape configured to seal an outer peripheral surface of the second cover.

Abstract: A underwater communication device communicates data with another underwater communication device having another first coil and another second coil in water. The underwater communication device includes a first coil configured to transmit the data to and from the other first coil via a magnetic field, a second coil configured to transmit the data to and from the other second coil via a magnetic field, a supply unit configured to supply the data to the first coil and the second coil, a first capacitor connected to the first coil and forming a first resonance circuit that resonates with the first coil at a first resonance frequency, and a second capacitor connected to the second coil and forming a second resonance circuit that resonates with the second coil at a second resonance frequency that is different from the first resonance frequency.

Abstract: Provided is a transmission coil which can inhibit reduction in transmission efficiency during underwater non-contact electric power transmission. A transmission coil configured to transmit electric power in water includes an annular electric wire through which an alternating current flows, and a first cover which includes non-conductive resin or non-magnetic resin and seals a periphery of the electric wire. The electric wire transmits the electric power via a magnetic field generated by flowing of the alternating current.

Abstract: A underwater communication device communicates data with another underwater communication device having another first coil and another second coil in water. The underwater communication device includes a first coil configured to transmit the data to and from the other first coil via a magnetic field, a second coil configured to transmit the data to and from the other second coil via a magnetic field, a supply unit configured to supply the data to the first coil and the second coil, a first capacitor connected to the first coil and forming a first resonance circuit that resonates with the first coil at a first resonance frequency, and a second capacitor connected to the second coil and forming a second resonance circuit that resonates with the second coil at a second resonance frequency that is different from the first resonance frequency.

Abstract: An antenna device includes a substrate having a ground conductor, an antenna conductor disposed approximately parallel with the ground conductor with an air layer or a dielectric layer, plural short-circuiting conductors that connect the antenna conductor to the ground conductor, and a feed conductor disposed in a vicinity of one of the plural short-circuiting conductors and that feeds the antenna conductor with power. When a wavelength of frequency used in the antenna device is represented by ?, an outer circumferential length of the slot is approximately 1? to 2? and a width of the slot is 0.005? to 0.05?, an interval between the plural short-circuiting conductors is shorter than or equal to ?/2, and a distance between the antenna conductor and the ground conductor is 0.005? to 0.05?.

Abstract: An electric power transmission device capable of efficiently performing contactless electric power transmission to an underwater vehicle in water is provided. The electric power transmission device, which is an electric power transmission device transmitting electric power to an electric power reception device including an electric power reception coil in water, includes one or more transmission coils including an electric power transmission coil which transmits electric power to an electric power reception coil via a magnetic field, an electric power transmission unit which transmits AC power to an electric power transmission coil, a capacitor which is connected to the transmission coil and forms a resonant circuit which resonates with the transmission coil, and a buoyant body connected to at least one of the transmission coils.