Small-size, low-height antenna device capable of easily ensuring predetermined bandwidth

摘要

The antenna device 11 contain a first radiating conductive plate 13 arranged above a grounding conductor 12 so as to be substantially parallel and opposite to the grounding conductor 12; a second radiating conductive plate 14 adjacent to the first radiating conductive plate 13 with a slit 15 interposed therebetween; a feeding conductive plate 16 and a first shorting conductive plate 17 that extends substantially orthogonally from an outer edge of the first radiating conductive plate 13 so as not to be opposite to the slit 15; and a second shorting conductive plate 18 that extends substantially orthogonally from an outer edge of the second radiating conductive plate 14 so as not to be opposite to the slit 15. The feeding conductive plate 16 is connected to a feeding circuit, and the first and second shorting conductive plates 17 and 18 are connected to the grounding conductor 12.