| 摘要 |
<p>PROBLEM TO BE SOLVED: To make radio communication with a mobile station efficient in a sector antenna system that generates a directivity sector so as to make radio communication with the mobile station of the sector. SOLUTION: A plurality of antennas T1-T6 are installed circularly and a control means 1 controls each of adjustment means G1-GL depending on a communication state with a mobile station such as number of mobile stations of each sector, a reception signal power versus an interference power ratio and a reception signal error rate, and each of the adjustment means G1-GL adjusts an amplitude and a phase of an electric signal applied to the antennas T1-T6 for each antenna so as to change directivity of sectors (L sets) synthesized by each of the adjustment means G1-GL according to the antennas T1-T6. Synthesizers H1-HL output an electric signal of a transmission object to the respective adjustment means G1-GL and synthesize the electric signal received by each of the antennas T1-T6 and adjusted by the adjustment means G1-GL.</p> |
