Patent ID: 7466270

Claim:
A planar antenna, comprising: a plate member, adapted to be electrically grounded; a first radiating electrode, opposing the plate member with a gap and extending parallel to the plate member; a second radiating electrode, opposing the plate member with a gap and extending parallel to the plate member; a feeding pin, connected to a center part of the first radiating electrode and a center part of the second radiating electrode, the feeding pin being adapted to feed power to the first radiating electrode and the second radiating electrode; a pair of first short-circuiting pins, electrically connecting the plate member and an outer edge of the first radiating electrode at symmetrical positions relative to the feeding pin; and a pair of second short-circuiting pins, electrically connecting the plate member and both ends of the second radiating electrode; wherein the first radiating electrode is formed with blank portions which are located at such positions that are on hypothetical straight lines connecting the feeding pin and the short pins; and wherein the first radiating electrode and the second radiating electrode are flush with each other.