| 摘要 |
PURPOSE:To simplify the installation work of a ground antenna and to make its maintenance and inspection work sure by installing plural ground antennas at intervals below the length of an on-vehicle antenna in the equipment transmitting information between the on-vehicle and ground. CONSTITUTION:One block section 2T is sectioned into plurality (n) at intervals (l) within the length L of a car, ground antennas 91-9n comprising induced loop are installed to each section point and they are connected electrically in series by a coupler 10, a cable 11 or the like. Further, the on-vehicle antenna 12 having the length L is arranged over nearly the total length L of a lower side or the like of a car 1. Through the constitution above, even if the car 1 exists at any position of the block section 2T, a signal is transmitted and received continuously. |
