| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive onboard transceiver for ETC vehicle in which the size can be reduced. SOLUTION: A transmitting/receiving antenna 1 is connected alternatively with a receiving circuit 4 for detecting a receiving signal or a transmitting circuit 5 outputting a carrier by means of an antenna switch 3. The antenna 1 is connected with the receiving circuit 4 by means of the antenna switch 3 on upon receiving a signal and connected intermittently with the transmitting circuit 5 by means of the antenna switch 3 when transmitting a signal so that ASK modulation can be effected by means of the antenna switch 3.</p> |
