| 摘要 |
<p>When the antenna element of an antenna is expanded, a helical element (4) acts as a parasitic element, and a high-frequency current flows through an element conductor (3), causing the element (4) to act as a parasitic element which is excited in a high frequency wave way. When the antenna element is housed, electrical energy is fed to the upper end of the element (4) from the upper end of an upper conductor section (6), and the overlapping parts of the element (4) and section (6) form an L-C parallel resonance circuit. Therefore, the antenna makes two-resonance operation.</p> |
