Patent ID: 6667716
Filing Date: 2003-12-23
Classification: H01Q

Abstract:
An improved planar inverted F-type antenna, comprising:a metal ground plane having a feeding metal bore formed thereon; a flat metal plate in parallel with the metal ground plane, having thereof an open circuit end and a short circuit end, the short circuit end being connected to the metal ground plane through a short circuit leg, the flat metal plate further having a feeding leg passing through the feeding metal bore, wherein the flat metal plate has a length of a quarter of wavelengths and forms an open-short circuit flat plate structure; and a slit structure on the flat metal plate at a location corresponding to the feeding metal bore, the slit structure having a middle metal section bent to form the feeding leg passing through the feeding metal bore, the slit structure forming on the flat metal plate a slit with an area matching the feeding leg, whereby the flat metal plate with the slit structure can change the feeding current route thereby enabling the antenna to receive signals of different frequencies thereby to increase operative bandwidth of the antenna.