Patent ID: 6437744
Filing Date: 2002-08-20
Classification: H01Q

Abstract:
A circularly polarized wave antenna device, comprising:a substrate comprising a dielectric material; a radiation conductor having a quadrilateral shape in a plan view, said radiation conductor being disposed on a first main surface of said substrate; a ground conductor disposed on a second main surface of said substrate, said second main surface being opposed to said radiation conductor; a feeding conductor disposed on said substrate so as to extend from said second main surface toward said first main surface; said radiation conductor having a shape wherein electric lengths in two orthogonal directions on said radiation conductor are equal to each other; and capacitive loading conductors provided at positions in diagonal directions of said radiation conductor on said substrate, and which generate load capacitance between said radiation conductor and said capacitive loading conductors, said load capacitance determining a frequency difference between two resonant currents flowing through said radiation conductor.