Design of an AMC with Little Sensitivity to Angle of Incidence Using an Optimized Jerusalem Cross FSS

In this paper, an angularly stable Artificial Magnetic Conductor (AMC) or High-Impedance Surface (HIS) is proposed. The structure is made of the well know Jerusalem Cross Frequency Selective Surface (JC-FSS) placed at the interface of a metal-backed dielectric slab. The paper begins by investigating the properties of a structure optimized in a prior work. Innovatively, this structure is corrected and changed, and the resultant structure is optimized not completely based on time consuming optimization methods, but by utilizing the theoretical clues presented in another work for the same structure. Taking these strategies, just by a simple optimization procedure and some parametric studies, such a structure is obtained that shows better angular stability compared to the initial structure, while having acceptable bandwidth and compact size. Periodic method of moments (PMM) is used to analyze and study the proposed planar periodic structure. Index Terms—Artificial magnetic conductor (AMC), high-impedance surface (HIS), perfect magnetic conductor (PMC), electromagnetic band gap (EBG) surface, frequency selective surface (FSS)