Patent ID: 8208852

Claim:
An electronic apparatus used as a transmitter and/or a receiver in a system performing electric field communication via a transmission medium, the electronic apparatus comprising: a first surface and a second surface opposite each other; a signal electrode for transmitting and/or receiving an electronic field signal arranged on a first surface side; a first apparatus component connected to or capacitively coupled with the signal electrode and arranged on the first surface side; and second apparatus components, including a battery, connected to or capacitively coupled with a reference potential of the electronic apparatus and arranged on a second surface side, wherein a sum (Cst) of a capacitance between the signal electrode and the transmission medium and a capacitance between the first apparatus component and the transmission medium, generated while the first surface is facing the transmission medium, is approximately equal to a sum (Cgt) of capacitances between the second apparatus components and the transmission medium generated while the second surface is facing the transmission medium.