POSITION DETECTION SYSTEM

摘要

An electromagnetic wave propagation medium (1) extends in an electromagnetic wave propagation direction, and is provided with an electromagnetic wave propagation space sandwiched between conductors in the direction orthogonal to the electromagnetic wave propagation direction. A base unit (2) and a plurality of terminals (3) are disposed on the electromagnetic wave propagation medium (1). When the positions of the terminals (3) are detected, the base unit (2) transmits a position detection signal to the terminals (3) via the electromagnetic wave propagation medium (1). The position detection signal undergoes greater attenuation due to the propagation in the electromagnetic wave propagation medium (1) than a communication signal used for normal communication. The position detection signal has a signal strength that decreases with the increasing distance from the base unit (2), and therefore the positions of the respective terminals (3) can be detected on the basis of the signal strengths of the position detection signal received by the respective terminals (3).