| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a portable device capable of maintaining the transmission and reception state of a radio signal at a high level regardless of the presence or absence of the storage of a mechanical key. <P>SOLUTION: The portable device includes transmission and reception circuits 1s, 1r for transmitting and receiving a radio signal via an antenna 1a, and stores the mechanical key 10 for emergency in a storage section 10a so that the mechanical key 10 can be taken out. The portable device includes: a push switch SW2 for detecting the presence or absence of the storage of the mechanical key 10 into the storage section 10a; an impedance matching circuit 1m for adjusting the impedance between the antenna 1a and the transmission/reception circuits 1s, 1r; and a portable device side control unit CPU 1c that is connected to the push switch SW2 electrically, and corrects the impedance between the antenna 1a and the transmission/reception circuits 1s, 1r by controlling the impedance matching circuit 1m according to the presence or absence of the storage of the mechanical key 10. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
