Patent ID: 7382322

Claim:
A circularly polarized patch antenna assembly, comprising: a substrate having a penetrating hole for penetrating the substrate; a radiation metal piece connected on the surface of the substrate and provided with a through hole corresponding to the penetrating hole, the radiation metal piece having four corners, any two diagonal corners provided with two symmetrical chamfers; a grounded metal piece connected to the bottom of the substrate and having a sheet thereon, the sheet having a penetrating hole whose inner diameter is larger than that of the penetrating hole, a plurality of frequency down-conversion metal pieces extending from four sides of the sheet, the frequency down-conversion metal pieces adhered on the side face of the substrate, the frequency down-conversion metal piece on one side face arranged diagonally with respect to the frequency down-conversion metal piece on the opposite side face; and a signal-inputting body penetrating the penetrating hole, through hole and penetrating hole and electrically connected with the radiation metal piece to form a signal-inputting point.