| 摘要 |
An antenna device includes 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 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, which is approximate to a ¼ length of the first wavelength and a ¼ length of the second wavelength; and a parasitic element connected to the ground, which is not parallel to the first side of the ground, a length of the parasitic element is approximate to ¼ length of the second wavelength and an interval of the parasitic element and the second power feed part is less than equals the ¼ length of the second wavelength.
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