| 摘要 |
<p>PURPOSE:To improve quality of communication of a traveling body-identification system. CONSTITUTION:In addition to a first pin diode 311 for switching supply of a carrier signal to a terminal P1 of an antenna 104, a matching termination circuit 321 for absorbing all input signals is provided in a switching circuit of a question device and further a second pin diode 313 is provided between this matching termination circuit 321 and the antenna 104. By performing ON/ OFF control of the first diode 311 and the second diode 313 complimentarily, the terminal P1 of the antenna 104 where no power is supplied to can be subjected to matching termination.</p> |
