Abstract
A series of characterization studies of physical and electromagnetic parameters has been carried out and presented in this paper. This study is focused in improving the performance of the bandwidth of reflectarray antenna element. The physical parameter is considering investigation on a variation of gap sizes of the element while for electromagnetic parameters is considering investigation on a variation of substrate thickness and its permittivity. Figure of Merit used in this paper is the phase range and phase slope to analyze the practicality of the element and the bandwidth performance. The FoM is according to the analysis from reflection phase and return loss versus frequency responses graph. The element is designed using computer software CST Microstripes namely concentric split ring square element. This element is the combination of a conventional annular ring and a novel square ring element, with the introduction of a gap into the element at TE direction. As the results, both physical and electromagnetic parameters are affects the performance of both phase range and phase slope of the element.