Patent ID: 6897813
Filing Date: 2005-05-24
Classification: H01Q

Abstract:
1. A combined antenna, comprising: a flat plate antenna for allowing a circular or polygonal metallic flat plate that has an opening at a center thereof to face a ground conductor by a predetermined interval and allowing the metallic flat plate to be connected to the ground conductor through ground terminals uniformly spaced along a peripheral edge of the opening as well as to a feed line through a feed terminal; a patch antenna, which has a dielectric substrate having a patch electrode on an upper surface and a ground electrode on a lower surface, respectively, placed and fixed on the metallic flat plate through an insulating member, for allowing a first feed pin and a second feed pin penetrating the dielectric substrate to be connected to the patch electrode at two positions equidistant from a center of the patch electrode along radial lines that form a right angle while allowing the first and second feed pins to be connected to a 90-degree phase difference circuit through the opening; and a printed board having the ground conductor formed on an upper surface and having a plurality of pass-through holes for allowing the ground terminals, the feed terminal, and the feed pins to be inserted and fixed to the pass-through holes, respectively, wherein the feed terminal is an extended line connecting the center of the flat plate antenna to first feed pin, and any two of the adjacent ground terminals are symmetrically placed with the extended line as an axis of symmetry while any one of the ground terminals is located along an extended line connecting the center of the flat plate antenna to the second feed pin, and wherein the flat plate antenna is excited to radiate a vertically polarized wave while the patch antenna is excited to radiate a circularly polarized wave.