Patent ID: 8686915

Claim:
An antenna device comprising: a board made of dielectric material, having first and second power feed parts; a first antenna element connected to the first power feed part, using a first wavelength; a second antenna element formed by printed wiring and connected to the second power feed part, using a second wavelength; a ground formed on the board, having a first side and a second side respectively having different lengths and extending in different directions, the length of the first side, compared with the length of second side, being more approximate to Â¼ length of the first wavelength and Â¼ length of the second wavelength; and a parasitic element that is a strip formed by printed wiring and connected to the second side of the ground, not parallel to the first side of the ground, a length of the parasitic element being approximate to Â¼ length of the second wavelength and an interval of the parasitic element and the second power feed part being not more than the Â¼ length of the second wavelength.