| 摘要 |
PURPOSE: To provide an antenna system with high performance at both transmission reception frequencies and to improve the transmission reception characteristic when plural antennas are close to each other for diversity reception. CONSTITUTION: An electric length of a transmission reception common antenna is selected depending on a transmission time slot and a reception time slot of a TDMA. Furthermore, an electric length of an exclusive reception antenna 50 or a termination impedance is selected for the transmission time slot and the reception time slot. Moreover, an electric length or a termination impedance of the reception antenna not selected in the case of antenna selection diversity reception is selected. Then a dummy antenna is provided and its electric length or termination impedance is selected for a transmission time slot and a reception time slot. |
