Patent ID: 8502746

Claim:
A planar directional antenna, comprising: a substrate, having a first surface and a second surface; a metal layer, disposed on the second surface, wherein an upper edge of the metal layer forms a concave parabolic curve which reflects and focuses radiation; a dipole master antenna, disposed on the substrate, located within a predetermined range of a focus of the concave parabolic curve and connected to a feed point, and comprising a first driving element, disposed on the first surface of the substrate, having a first arm and a second arm; and a second driving element, disposed on the second surface of the substrate and extended directly out of the metal layer, having a first arm and a second arm, wherein the first arms of the first driving element and the second driving element overlap each other on a vertical projection plane, and the second arms of the first driving element and the second driving element are symmetrical to the radiation direction; and an auxiliary antenna, disposed on the substrate and opposite to the master antenna so that the planar directional antenna generates a beam toward a radiation direction.