| 摘要 |
PROBLEM TO BE SOLVED: To improve selectable reception sensitivity and transmitter output by providing a bidirectional active antenna repeater of an interior radio communication system, which distributes a signal received from an external signal source in a building and widens the use range of a cordless telephone used in an office. SOLUTION: The bidirectional activity antenna repeater of this indoor radio communication system is equipped with reception parts RX1 and RX2, transmission parts TX1 and TX2, a variable phase shifter 16, and 1st and 2nd antennas 12 and 14 at one of those parts. The variable phase shifter 16 makes a phase shift which is selectable between the 1st and 2nd antennas 12 and 14, when a signal sent to the 1st antenna 12 is sent to the 2nd antenna 14. Those antennas 12 and 14 are separated from each other by a half wavelength. In the building, the signal received from the external signal source is distributed to widen the use range of the cordless telephone 28 used in the office. |
