| 摘要 |
A diversity reception system used for a mobile radio communication system of a sector type is constructed using single-directivity transmitting-receiving antennas and a non-directivity receiving antenna, all of which are fixed to a support pole such as a steel pipe pole and a steel tower. The single-directivity transmitting-receiving antennas are fixed to a peripheral surface of the support pole and are arranged in directions corresponding to sectors respectively. The non-directivity receiving antenna is fixed to a head portion of the support pole and is arranged above the single-directivity transmitting-receiving antennas by a prescribed interval of distance, which corresponds to at least nine wavelengths of radio waves. The single-directivity transmitting-receiving antennas are connected to transceivers, each containing a diversity receiver, respectively. A receiving power amplifier that amplifies receiving power input to the non-directivity receiving antenna is fixed to the support pole and is located just below the antennas and is provided to compensate a low gain of the non-directivity receiving antenna. A distributor is provided for distributing an output of the receiving power amplifier to the transceivers respectively. Thus, diversity reception is performed using any one of the single-directivity transmitting-receiving antennas and the non-directivity receiving antenna.
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