Innovative Methodology for Developing Frequency Selective Surfaces on Arbitrary Curved Surfaces

Abstract

This article presents a novel technique for designing frequency selective surfaces (FSS) on arbitrary surfaces based on the computer-aided design (CAD) model. Utilizing the ray triangle intersection algorithm and the Riemann sum technique ensures uniform unit cell placement by computing equidistant points across complex surfaces. This innovative approach has a profound advantage in the design of conformal FSS, eliminating the need for surface equations and time-consuming parametric variation. For demonstration, a unit cell is designed with a bandstop filter response at 10 GHz in the X-band along with an insertion loss of 20 dB, and its performance is checked under normal and oblique incidence. Then an arbitrary surface is developed, and its CAD model is determined. Subsequently, the unit cell is uniformly placed on the surface using the proposed technique. The efficacy of the technique is validated through simulation using a finite element boundary integral (FEBI) setup, followed by the prototype fabrication using a 3-D printer and the electromagnetic (EM) response measurement of the designed FSS. © 2024 IEEE.