| 摘要 |
<p>An antenna arranged such that a disc-like radiation plate (1) provided facing a ground plate (2) and having a diameter substantially equal to half-wave electrical length is provided, at the circumferential part thereof, with a first feeding port (3) and a second feeding port (4). The feeding ports (3, 4) are located at such positions that the lines connecting the respective ports and the center of the radiation plate (1) cross perpendicularly to each other. The radiation plate (1) is provided with four slits (6) line-symmetrically to the lines connecting the respective ports and the center of the radiation plate (1) and two sides at the periphery of each slot (6) are substantially aligned with each other.</p> |
