| 摘要 |
An antenna unit of the present invention is an antenna unit that performs wireless communication utilizing induction coupling, the unit includes a loop antenna; a communication circuit section that is connected to the loop antenna in order to perform wireless communication utilizing induction coupling; a metallic plate provided outside or inside the loop antenna in a form of a loop by an openable and closable switch; and a detector that detects a receiving level of a wireless signal received by the loop antenna, wherein the communication circuit section controls opening and closing of the switch according to a receiving level of the wireless signal detected by the detector, thereby switching a state of the metallic plate between a closed looped state and an open non-looped state.
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