Being the folded dipole antenna device of the folded dipole

摘要

Disclosed is a folded dipole antenna device which is of an unbalanced feed type and includes an antenna element of approximately plate-like loop structure, connected to an antenna feed point (1) and an antenna ground (2) provided on a base plate (4). In the folded dipole antenna device, the antenna element of loop structure includes a pair of first element sections (3g, 3f) which extend approximately parallel to the base plate (4), a second element section formed by merging element sections (3c, 3d) that are folded back from both ends of the first element sections (3g, 3f) and extend approximately parallel to the first element sections (3g, 3f), and a third element section (3a) which extends from a folded top part of the second element section toward the first element sections (3g, 3f) and an end part thereof is close to the first element sections (3g, 3f).