Patent attributes
An antenna apparatus capable of main beam direction switching is provided that achieves high gain with a small, planar configuration. Rhombic antenna sections composed of linear elements 101a through 101d, 102a through 102d, and 103a through 103d are arranged in the same plane, and the rhombic antenna sections are connected by linear linking elements 104a through 104d. Linear detour elements 105a and 105b are connected to the pair of vertices of the rhombic antenna sections arranged at each end. Feed points 106a and 106b are provided at the other opposite two pairs of vertices of any of the rhombic antenna sections, and the opposite vertices of the other rhombic antenna sections are connected by linear elements. A plate reflector is arranged at a distance h from, and parallel to, the surface on which the rhombic antenna elements are arranged.
