<p>A control unit (100) generates a control signal for selecting an antenna unit (200), and transmits the control signal to the antenna unit (200). Based on the antenna selection control signal, each antenna unit (200) controls impedance of a matching circuit (212) to match when the own antenna unit (200) is selected, and controls impedance of the matching circuit (212) not to match when the own antenna unit (200) is not selected.</p>
