Abstract: An improved planar inverted-F antenna (PIFA) is provided. The PIFA made with a bent metal sheet having a substantial four-side frame in sectional contour includes a feed sheet, a radiating sheet, a grounding sheet and a short lead. Wherein, a feed lead is protruded from the feed sheet, a grounding lead is protruded from the grounding sheet; the feed lead and the grounding lead are adjacent to each other, a bent flange extends outward from an end of the grounding sheet towards the direction of the radiating sheet and a fastener is disposed on the bent flange used for fixing the antenna onto an electronic device.