| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an on-vehicle communication system by which communication can be performed without lowering irradiation efficiency of an antenna even when the communication is performed in a low frequency equal to or less than the cutoff frequency, and an allocation method of the antenna for disposing the antenna so that the radiation efficiency of the antenna is not lowered even when the communication is performed in low frequencies. <P>SOLUTION: When an opening frame of a vehicle is regarded as a wave guide tube, a loop antenna 29a is used as an antenna that is used for the on- vehicle communication system of which the frequency of radio waves that are outputted from a communication means is set equal to or less than the cutoff frequency of the wave guide tube and the loop antenna 29a is disposed along the body of a vehicle. <P>COPYRIGHT: (C)2003,JPO</p> |
