Patent ID: 8736507
Filing Date: 2014-05-27
Classification: H01Q

Abstract:
1. An antenna apparatus comprising: a dielectric substrate having first and second surfaces; a grounding conductor formed on the first surface; a strip conductor formed on the second surface so as to oppose to the grounding conductor to configure a feeder line; a dipole antenna that comprises first and second feed elements and has an electrical length that is substantially a half of a wavelength of a high-frequency signal transmitted via the feeder line, the first feed element being formed on the second surface and connected to the strip conductor, the second feed element being formed on the first surface and connected to the grounding conductor; and a plurality of first parasitic element pairs, each of the first parasitic element pairs comprising first and second parasitic elements being formed on the second surface, wherein the first and second parasitic elements of each of the first parasitic element pairs have a strip shape and are formed on a straight line, which is parallel to a longitudinal direction of the dipole antenna and is positioned in a radiation direction of a radio wave from the dipole antenna, so as to have a gap therebetween and so as to be electromagnetically coupled with each other, and wherein the dipole antenna and the respective first parasitic element pairs are arranged at predetermined intervals so as to oppose to and to be electromagnetically coupled to each other.