Patent ID: 7091920

Claim:
A slot antenna apparatus, comprising: a conductor member having a cross-shaped slot composed of a first slot and a second slot therein, the first and second slots being perpendicular to each other; a feeding pin for feeding power to the conductor member at a predetermined location spaced from the cross-shaped slot; and a circuit substrate connected to the feeding pin and having a high-frequency circuit arranged therein, wherein the first and second slots are excited by feeding the power through the feeding pin, and the second slot is excited with a phase difference of about 90 degrees with respect to a resonance mode of the first slot such that the slot antenna apparatus is operated as a circular polarization antenna, wherein lengths of the first and second slots are approximately equal to each other, and a location of the feeding pin is set such that a shortest distance from the feeding pin to the first slot is different from a shortest distance from the feeding pin to the second slot by a predetermined size.