Analysis on element shape geometries to enhance reflection coefficient and gain of reflectarray antenna

An analysis on element shape geometry is presented in this paper to enhance the reflectarray element bandwidth, to produce a more reliable phase distribution over the reflectarray antenna aperture and to have a good reflection element performance. The shape analysis consists of circular patch element, circular ring element and circular square ring element. The reflection coefficient parameter focuses on phase range, phase slope, bandwidth and return loss performance for each analysis and presented in this paper. It is shown that the proper selection of element shape geometry will significantly affects the reflection coefficient of reflectarray element and the antenna gain performances.