| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device capable of performing matching even without changing an interval between an end part of a vehicle body flange and an outer edge of a conductive film and capable of easily improving an antenna gain by improving radiation efficiency.SOLUTION: The antenna device includes: a glass plate 11 that is fixed to a vehicle body flange 45 of a window opening part of a vehicle body; a glass plate 12; a conductive film 13 disposed between the glass plate 11 and the glass plate 12; and a single-pole electrode 16 provided at a face opposite to the glass plate 11 side of the glass plate 12. In the antenna device, the electrode 16 is disposed at a position where the electrode 16 is capacitively coupled to the conductive film 13, and loop-shaped slits 10a to 10d between end parts 41 to 44 of the vehicle body flange and outer edges 13a to 13d of the conductive film 13 function as a slot antenna. The conductive film 13 includes notches 23, 24 the one end of each of which is made an open end at an outer edge 13a in the vicinity of the electrode 16. |
