Patent ID: 6636180
Filing Date: 2003-10-21
Classification: H01Q,H05K

Abstract:
A printed circuit board antenna for use in a communications device which communicates with another communications device via a radio frequency signal having a wavelength lambda, the printed circuit board antenna comprising:a printed circuit board having a top face and a bottom face; a metal sheet disposed on one of the top and bottom faces of the printed circuit board, said metal sheet functioning as a grounding plane for the printed circuit board antenna and being adapted for electrically connecting with a grounding braiding of an antenna coaxial cable, the metal sheet having a covered portion covered over with an insulating coating, and an exposed portion adapted for soldering to the grounding braiding of the antenna coaxial cable; and at least two microstrip traces located respectively on the top and bottom faces of the printed circuit board, the at least two microstrip traces being electrically connected together via at least one conductive through hole defined through the printed circuit board to form a continuous conductive line which has a length no less than one quarter times lambda, one of the at least two microstrip traces electrically connecting with a central signal conductor of the antenna coaxial cable.