| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultra wide band antenna apparatus in which antenna characteristics approximately non-directional over all operable ranges are indicated and height reduction and cost reduction can be easily attained. SOLUTION: In an ultra wide band antenna apparatus 1, a radiation conductor 3 disposed on a ground conductor plane 2 at a predetermined interval includes a vertical conductor 3c extending in a plane approximately orthogonal to the ground conductor plane 2 and a horizontal conductor 3d extending within a plane approximately parallel to the ground conductor plane 2. The vertical conductor 3c has first to fourth approximately fan-shaped vertical plates 31 to 34 disposed while being shifted by 90° along the ground conductor plane 2, the first to fourth vertical plates radially extend from a central part 3a of the radiation conductor 3. The horizontal conductor 3d has a first horizontal plate 35 bridging upper ends of the first and second vertical plates 31 and 32 and a second horizontal plate 36 bridging upper ends of the third and fourth vertical plates 33 and 34, and a feed point P is provided in the vicinity of a lower end of one of the first to fourth vertical plates. COPYRIGHT: (C)2011,JPO&INPIT |
