Patent ID: 6661381
Filing Date: 2003-12-09
Classification: H01Q

Abstract:
A circuit-board antenna for radiating and receiving electromagnetic (EM) waves of a wavelength and with an increased radiation gain, the antenna comprising:a circuit board, which has an upper surface and a lower surface; a signal part having an open end formed on the upper surface of the circuit board, the open end having a plurality of radiation sections and a plurality of twisty sections, each of whose path lengths being (n+Â¼) times the wavelength where n is a positive integer, each of the twisty sections being positioned between two of the radiation sections; wherein the plurality of radiation sections is comprised of radiation sections with a length of Â¼ times the wavelength and others with a length of Â½ times the wavelength for radiating and receiving the EM waves of the wavelength, and each of the plurality of twisty sections has a path length of Â½ times the wavelength to make the EM waves cancel by themselves; and a ground with a second open end formed on the lower surface of the circuit, the path length of the second open end being Â¼ times the wavelength.