Patent ID: 8035571
Filing Date: 2011-10-11
Classification: H01Q,H04B

Abstract:
1. An antenna device, comprising: a conductive ground plane; first and second antenna elements connected to the conductive ground plane through first and second feeding points, respectively, directivities of the first and second antenna elements being arranged to be approximately perpendicular to each other; a phase adjusting circuit configured to provide a phase difference of approximately 180 degrees between first and second signals received by the first and second antenna elements, respectively; a combining circuit configured to combine the first and second received signals having a phase difference of approximately 180 degrees therebetween to obtain a combined signal; and a radio unit configured to process the combined signal, wherein a distance between the first and second feeding points is equal to or smaller than a quarter of an operating wavelength, each of the first and second antenna elements comprises a first partial element parallel to the conductive ground plane, and a second partial element approximately perpendicular to the conductive ground plane, each second partial element having a first end connected to a first end of a corresponding one of the first partial elements, each second partial element having a second end connected to a corresponding one of the first and second feeding points, and each first partial element is angled so that respective open ends thereof are adjacent to each other.