Patent ID: 6614401
Filing Date: 2003-09-02
Classification: H01Q

Abstract:
An antenna-electrode structure comprising:a substrate; a grounded portion provided on the substrate; a non-grounded portion on which an antenna is mounted; a feeding radiant-electrode into which a signal is supplied from a signal supply source; a non-feeding radiant-electrode arranged adjacent to the feeding radiant electrode in a direction separated from the grounded portion via a space therebetween for producing a dual-frequency resonance state by electromagnetic coupling with the feeding radiant-electrode; and a dielectric base substance surface-mounted on the substrate and having the feeding radiant-electrode mounted thereon; wherein one end of the feeding radiant-electrode is open so as to define a capacitance to the grounded portion therebetween; and wherein the non-feeding radiant-electrode is provided on the dielectric base substance along the feeding radiant-electrode and one end of the non-feeding radiant-electrode is connected to the grounded portion while the other end is open, the open-end of the non-feeding radiant electrode defining a capacity-loaded electrode forming a capacitance to the grounded portion therebetween at a position close to a capacity portion located between the open-end of the feeding radiant-electrode and the grounded portion.