| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the influence and interference due to radio waves against electronic equipment outside a vehicle, at conducting radio communication inside a vehicle. SOLUTION: When the opening of a vehicle is considered as a waveguide, the frequency of the transmission radio waves of a signal to be communicated wirelessly between a first transmitter/receiver 1001 and a second transmitter/ receiver 1002 installed for executing radio communication inside the vehicle is set so as to be not more than the cut-off frequency of the waveguide.</p> |
