Patent ID: 8031123

Claim:
An antenna comprising: a feeding radiation electrode including one end defining a feeding point and another end defining an open end, the feeding radiation electrode defining substantially a quarter wavelength feeding radiation electrode constructed to operate in an operating frequency range; and a non-feeding radiation electrode including one end defining a ground end and another end defining an open end; said feeding and non-feeding radiation electrodes being disposed on a base made of a material selected from either a dielectric material or a combination of dielectric and magnetic material; wherein the feeding radiation electrode and the non-feeding radiation electrode are arranged on the base with a predetermined distance provided therebetween, and a branch electrode is provided on the base so as to extend from the non-feeding radiation electrode toward the feeding radiation electrode along a line that intersects a portion of the feeding radiation electrode; and said antenna has, at said operating frequency range, a multi-resonance including fundamental resonances and harmonic resonances generated by the feeding radiation electrode and the non-feeding radiation electrode.