| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a loop antenna unit that suitably changes a plane of polarization with simple constitution. <P>SOLUTION: Feeders 44, 48 are used to transmit signals generated by superposing a high-frequency signal related to communication by the loop antenna unit 36 and DC signals Vci, Vcq for respectively performing switching control over first to fourth switching portions SW1 to SW4 one over the other. The loop antenna unit includes HPFs 62, 64 that extract the high-frequency signal related to communication by the loop antenna unit 36 from the signals supplied through the feeders 44, 48 and supply the extracted high-frequency signal to the antenna element 52, and LPFs 66, 68 that extract the DC signals Vci, Vcq for control over switching by the first to fourth switching portions SW1 to SW4 from the signals supplied through the feeders 44, 48 and supply the extracted DC signals to those switching portions, so the control over switching of the plane of polarization can be performed by the single element, and it is not necessary to prepare a control line for the control over the switching. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
