S Parameters Study of PDGS with Defected Rectangles

PDGS with defected rectangles can be used to prohibit the propagation of electromagnetic waves within a certain band of microwave frequency. The precise S parameters of PDGS are obtained through FDTD analysis in this paper. PDGS with defected rectangles have excellent stopband characteristic when periodic unit amounts and structure sizes meet definite conditions. The deepness and width of stopband will increase with the increase of periodic unit amounts and etched rectangle sizes. The precise relation given in the paper will provide powerful tool for the analysis and design of PDGS as microwave filter. Moreover, according to circuit theory the defected areas can be realized by not only rectangle, but also other geometries such as triangle, circle, and so on.