Patent ID: 7782270

Claim:
A planar inverted-F antenna comprising: a grounding metal plate; a short-circuit piece formed on a first side edge of the grounding metal plate and having a predetermined height; a first antenna signal radiating plate connected to the grounding metal plate by the short-circuit piece and substantially parallel to and spaced from the grounding metal plate by a first predetermined distance to form a current path for a first resonant frequency of the antenna; a second antenna signal radiating plate connected to the grounding metal plate by the short-circuit piece and substantially parallel to and spaced from the grounding metal plate by the first predetermined distance so as to be in a same horizontal plane as the first antenna signal radiating plate, the second antenna signal radiating plate forming a current path for a second resonant frequency of the antenna; a feeding point formed at a predetermined location on the second antenna signal radiating plate; and an extended grounding plane formed on and extending from a side edge of the grounding metal plate in a direction toward the feeding point by a second predetermined distance and spaced from the feeding point by a third predetermined distance.