RELAY SYSTEM FOR MOBILE COMMUNICATION

摘要

PURPOSE:To ensure an excellent communication state between an outside of a structure and a mobile communication equipment in a building. CONSTITUTION:Antennas 208A-208C and couplers 213A-C are installed respectively to each block in a tunnel. The couplers 213A-C are connected to a transmission line C and the transmission line C is connected to a converter 211 at the exit of the tunnel. An antenna 212 is provided to the converter 211, a transmission wave (frequency fR1) is outputted to an exchange station or a relay station, and a signal radio wave (frequency fR2) from the exchange station or the relay station is received. A transmission line L1 is installed and a local fundamental wave (frequency fL1) is transmitted from a local oscillation fundamental wave output terminal of the converter 211 to each of the couplers 213A-C.