| 摘要 |
PURPOSE:To prevent a decrease in transmission output by performing communication by switching antennas successively according to the periods of frames to which time slots of respective transmitted and received signals are assigned. CONSTITUTION:While converting input signals from input terminals 5a-5d into a signal having time arrangement, a controller 4 operates an antenna switch 2 according to time intervals of respective small frames to generate a control signal which leads the transmission output of a transmitter and receiver 1 to respective antennas 3a-3d. Therefore, the signal from the controller 4 is converted by the transmitter 1 into a signal in a radio frequency band, and the resulting signal is sent from the antennas 3a-3d in respective direction at time intervals of small frames. On the other hand, a signal from each subordinate station belonging to each antenna is controlled to arrive at the time when the antenna switch 2 is connected by the control time slot for a frame in each direction, thus performing reception by the antennas 3a-3d. |
