Patent ID: 8373546
Filing Date: 2013-02-12
Classification: G08C

Abstract:
1. A mobile body remote control system comprising: (a) a guideway for guiding a mobile body to a predetermined place, the guideway being a balanced feeder line including a pair of parallel conductor lines spaced from each other and a dielectric body supporting the parallel conductor lines; and (b) a coupling device provided on the mobile body for transmission and reception of control information used to control movement of the mobile body along the guideway, the coupling device including: a first loop antenna having a pair of outputs and a second loop antenna having a pair of outputs that are cross-connected to the pair of outputs of the first loop antenna, a distance from a center of the guideway to a center of the first loop antenna being less than a distance from the center of the guideway to a center of the second loop antenna, said distance from the center of the guideway to the center of the first loop antenna being less than a distance from the center of the guideway to the center of the second loop antenna enabling said coupling device to extract a difference between an electric current flowing in the first loop antenna and an electric current in the second loop antenna, wherein when a wave source of an undesired wave is remote from the coupling device by a distance sufficiently larger than a distance from the coupling device to the balanced feeder line, even if an intensity of the undesired wave is increased, an output of the coupling device corresponding to the undesired wave is suppressed.