| 摘要 |
<p>There are provided a dielectric substrate (2) that erects from a ground surface (1), and a radiation conductor (3) that is provided on a surface of the dielectric substrate so as to extend in the vertical direction. The bottom end of the radiation conductor is connected to a feeder line (4). The radiation conductor has a bottom portion and a top portion that is distant from the ground surface and is wider than the bottom portion. Increasing the capacitance by making wide the top portion (capacitive region), having a large voltage variation, of the radiation conductor in this manner lowers the resonance frequency. Therefore, a height dimension of the radiation conductor for attaining resonance at a desired frequency can be made much smaller than in conventional monopole antennas. <IMAGE> <IMAGE> <IMAGE></p> |
