| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress spurious to an ETC signal band radiated from an antenna 12 by making an antenna connection circuit (42) mismatched in the ETC signal band outputted from a PA (86) and including the spurious. <P>SOLUTION: In a communication module 10 of an on-vehicle apparatus 100, telephone signals in 2 GHz band are amplified by the PA (86), and the telephone signals are outputted from a triplexer (44) to the antenna 12 via the antenna connection circuit (42). Then, the telephone signals in 2 GHz band are transmitted from the antenna 12. When the telephone signals are transmitted, the spurious to the ETC signal band is outputted from the PA (86), and may be directly inputted into the triplexer (44). Therefore, the antenna connection circuit (42) provided between the antenna 12 and the triplexer (44) is set so as to be matched in a frequency band of the telephone signals including 2 GHz band and so as not to be matched in the frequency band of the ETC signal including 5.83 GHz. <P>COPYRIGHT: (C)2012,JPO&INPIT |
