| 摘要 |
PROBLEM TO BE SOLVED: To bring a monopole antenna as closer as possible to an EBG substrate while suppressing the deterioration of antenna characteristics as much as possible. SOLUTION: An antenna apparatus of one embodiment is equipped with a finite ground plane; a plurality of first planar elements arranged along and on both sides of a first gap line or a second gap line that is orthogonal to the first gap line; a plurality of first linear elements for connecting the finite ground plane with the first planar elements; a second linear element arranged in the first gap line or the second gap line; an antenna element including a third linear element arranged such that one end thereof is connected to one end of the second linear element and the other end thereof faces the finite ground plane; and a first feeding point for supplying electric power from the other end side of the third linear element to the antenna element. A connection point between the second and third linear elements is positioned in an intersection area of the first and second gap lines, and the first feeding point is provided in the vicinity of an edge of the finite ground plane. COPYRIGHT: (C)2009,JPO&INPIT
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