| 摘要 |
PURPOSE:To attain effective utilization of a frequency by receiving and comparing an incoming call of a zone in which a mobile station is possibly resident and other control channel signal to specify the resident zone, and setting a transmission-reception polarized wave to a designated polarized wave of the zone. CONSTITUTION:The transmitter-receiver is provided with a circularly polarized wave radiation element 12 and a feeding switch 17 to switch the relative phase between two feeding points, or a paralyzer to be used as the circularly polarized wave radiation element 12 and a linearly polarized wave primary radiation element capable of radiating both horizontal and vertical polarized waves selectively to be used as the feeding switch 17. Then the right rotatory and left rotatory circularly polarized waves are selected, and an incoming call signal of one and plural zones and other control channel signal in which the mobile station is possibly resident are received by an antenna circuit and a reception circuit 15, respectively, and the reception intensity is compared with a reception intensity comparator circuit 18 to specify the resident zone and the transmission reception polarized wave is set to the designated polarized wave of the zone. Thus, the frequency is effectively utilized. |
