Analyzing Uncertainties of Rectangular Periodic Defected Ground Structure Characteristics

The defected ground structure (DGS) is one such technique which where intentionally modified to enhance the performance of the ground plane metal of a microstrip circuit. Importantly, in microwave application, the DGS plays an important role in analyzing the effect of surface and leaky waves. During the time of experimental analysis, the surface and leaky waves are affected by the propagation uncertainties. Hence, the performance of microstrip circuit is also affected. So, proper mathematical model is needed for analyzing the propagation uncertainty of DGS and to improve the performance. In this paper, the curve fitting mathematical model is proposed for analyzing the propagation uncertainty. In the proposed model, the bi-segmentation process is applied to the experimental characteristics. The proposed curve fitting model is implemented and the Rectangular Periodic defected ground structure propagation uncertainties are analyzed.