| 摘要 |
PURPOSE:To improve the quality of communication between indoor antennas and a terminal equipment by arranging plural antennas through a signal line laid in a ceiling in a house so that adjacent indoor antennas transmit and receive circularly polarized waves in opposite rotation directions. CONSTITUTION:Circularly polarized waves in opposite rotation directions are radiated from indoor antennas 3, and circularly polarized waves in corresponding rotation directions are received by circularly polarized wave upward beam antennas 61 and 62 respectively. Since a part of signals received by antennas 61 and 62 is led to a comparator 57 through branch lines 55 and 56, the antenna from which the reception level is higher is discriminated. On the basis of this discrimination result, a controller 54 connects the output of the antenna, from which the reception signal level is higher, to a transmitter-receiver 51. |
