Abstract: A connection apparatus includes a connection terminal connectable to an electronic device, a cable connected to the connection terminal a transceiver connected to the cable and configured to control transmission and reception of high-frequency signals or high-frequency power, a terminal line connected to the transceiver and having an electrical length of substantially 90 degrees, and a signal wire for electric field communication, the signal wire being connected from the transceiver to the ground of the cable. The connection apparatus is capable of easily adding an electric field communication function to an existing electronic device.

Abstract: A more useful information processing apparatus, information processing system, and information processing method are provided. An information processing apparatus includes an operation interface and a controller. The operation interface receives an operation by a user and is capable of electric field communication with an electric field communication terminal. The controller executes a predetermined process, using information acquired by electric field communication, when detecting execution of a predetermined operation on the operation interface.

Abstract: A transmission device includes a magnetic field antenna and an electric field antenna connected electrically to the magnetic field antenna. When the magnetic field antenna is at a position allowing reception of a magnetic field signal transmitted by another magnetic field antenna included in a magnetic field transmission device, the transmission device becomes capable of transmitting an electric field signal generated on the basis of the magnetic field signal. The electric field antenna is grounded by being connected electrically to a ground to which the magnetic field transmission device is connected.

Abstract: A transmission device includes a magnetic field antenna and an electric field antenna connected electrically to the magnetic field antenna. When the magnetic field antenna is at a position allowing reception of a magnetic field signal transmitted by another magnetic field antenna included in a magnetic field transmission device, the transmission device becomes capable of transmitting an electric field signal generated on the basis of the magnetic field signal. The electric field antenna is grounded by being connected electrically to a ground to which the magnetic field transmission device is connected.

Abstract: A transmission apparatus (10) includes a communication device (30), comprising two input/output terminals (20a, 20b), and a terminal line (40) connected to the first input/output terminal (20a) and having an electrical length of substantially 90°. By the second input/output terminal (20b) electrically coupling with a transmission medium (50) comprising a conductor or a dielectric, a high frequency signal or electric power is transmitted to another transmission apparatus coupled electrically to the transmission medium (50).

Abstract: A transmission apparatus includes a communication unit, including input/output terminals and two coupling electrodes. An input/output circuit of the communication unit is configured to function interchangeably. The two coupling electrodes are arranged along the longitudinal direction of the transmission medium, when coupled to the transmission medium. When the length from one coupling electrode of the two coupling electrodes to one end of the transmission medium in the longitudinal direction thereof is an electrical length in a range of (2n·90±45)° of the electrical signal and the length from another coupling electrode of the two coupling electrodes to another end of the transmission medium in the longitudinal direction thereof is an electrical length in a range of ((2n+1)·90±45)° of the electrical signal while the two coupling electrodes are coupled to the transmission medium, the communication unit transmits and receives the electrical signal to and from another transmission apparatus.

Abstract: A transmission apparatus includes a communication unit, including input/output terminals and two coupling electrodes. An input/output circuit of the communication unit is configured to function interchangeably. The two coupling electrodes are arranged along the longitudinal direction of the transmission medium, when coupled to the transmission medium. When the length from one coupling electrode of the two coupling electrodes to one end of the transmission medium in the longitudinal direction thereof is an electrical length in a range of (2n·90±45°) of the electrical signal and the length from another coupling electrode of the two coupling electrodes to another end of the transmission medium in the longitudinal direction thereof is an electrical length in a range of ((2n+1)·90±45°) of the electrical signal while the two coupling electrodes are coupled to the transmission medium, the communication unit transmits and receives the electrical signal to and from another transmission apparatus.

Abstract: A transmission apparatus (10) includes a communication device (30), comprising two input/output terminals (20a, 20b), and a terminal line (40) connected to the first input/output terminal (20a) and having an electrical length of substantially 90°. By the second input/output terminal (20b) electrically coupling with a transmission medium (50) comprising a conductor or a dielectric, a high frequency signal or electric power is transmitted to another transmission apparatus coupled electrically to the transmission medium (50).