| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a smart key system which avoids the verification of a portable machine near a wiring harness and suppresses the generation of radio noises from the wiring harness, by suppressing the leakage of an electromagnetic wave from the wiring harness. <P>SOLUTION: In this smart key system 1, impedance values of first and second analog circuit sections 107 and 108, which are arranged between an H-bridge circuit 106 and the wiring harness 50, are set identical with each other. Thus, since impedances of going and returning passages of wiring for connecting the H-bridge circuit 106 and a transmission antenna 30 together become symmetrical to each other, an output voltage from the first analog circuit section 107 and an output voltage from the second analog circuit section 108 correspond to each other. This enables the leakage of the electromagnetic wave from the wiring harness 50 to be suppressed by making current values of the going and returning passages consistent with each other. Consequently, the verification of the portable machine is not performed near the wiring harness 50, and the generation of the radio noises from the wiring harness 50 is suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT |
