Analysis of Angular Stability of FSS Based on Open Trapezoidal Rings Geometry

This paper investigates the angular stability of a frequency selective surface (FSS) based on open trapezoidal rings geometry. This geometry presents interesting features, such as miniaturization and possibility of resonant frequencies independent control. This research is focused on the angular stability. The open trapezoidal rings geometry is described and initial design equation presented. A FSS prototype was fabricated and characterized, verifying a good agreement between numerical and measured results. The angular stability was confirmed for the incidence angle up to 30°, which is an encouraging result.