Patent ID: 8917217
Filing Date: 2014-12-23
Classification: H01Q

Abstract:
1. A broadband circularly polarized annular ring slot antenna, comprising: a substrate, having an upper surface and a lower surface; an annular ring slot antenna portion, located on the upper surface and including a grounding unit, an annular ring slot unit, a central metal unit, a first perturbation metal unit and a second perturbation metal unit, the annular ring slot unit being surrounded by the grounding unit, the central metal unit being surrounded by the annular ring slot unit; and a microstrip feeding portion, located on the lower surface and including a vertical feeding unit, a bent feeding unit and a rectangular microstrip unit, the rectangular microstrip unit being connected with the bent feeding unit and the vertical feeding unit respectively, the vertical feeding unit being extended from the bent feeding unit toward a side edge of the substrate, the bent feeding unit being extended from the vertical feeding unit toward another side edge of the substrate; wherein the first perturbation metal unit and the second perturbation metal unit of the annular ring slot antenna portion are extended from the grounding unit toward the central metal unit respectively, and the first perturbation metal unit and the second perturbation metal unit are implanted in the annular ring slot unit diametrically opposite with respect to the central metal unit, and wherein the first perturbation metal unit is composed of a first rectangular patch and a first semi-elliptical patch extended from the first rectangular patch toward the central metal unit, and the second perturbation metal unit is composed of a second rectangular patch and a second semi-elliptical patch extended from the second rectangular patch toward the central metal unit.