AMC's Angular Stability Improvement Through the Introduction of Lumped Components

A novel method to improve the angular stability of artificial magnetic conductors (AMCs) is presented. The study is carried out from the viewpoint of designers facing common design specifications (resonance frequency, bandwidth, and commercially available dielectric). AMCs resonating at 5.8 GHz are designed based on square loop and patch-shaped unit cells, introducing lumped components on a later stage aiming to improve the angular stability. Both an equivalent circuit model and electromagnetic simulations are used to provide a clear justification of the presented results. Moreover, some guidelines to choose the proper lumped components' values, using analytical expressions and an AMC's equivalent circuit model, are provided.