| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication apparatus which can improve communication distance performance while achieving size reduction. <P>SOLUTION: A proximity non-contact communication apparatus 1 includes a movable mechanism and by the movable mechanism, an opening area of an antenna coil 21, which constitutes a resonance circuit, changes. Corresponding to the change of the opening area of the antenna coil 21, an electrostatic capacitance of a variable capacitor in a housing is changed, so that a resonance frequency of the resonance circuit becomes constant. This technology can be applied, for example, to a proximity non-contact communication apparatus that outputs an electromagnetic wave for communications. <P>COPYRIGHT: (C)2012,JPO&INPIT |
