3-D Centrally-Loaded FSS Leveraging Conductive and Dielectric Multimaterial Additive Manufacturing for Broadband Performance

This paper presents a three-dimensional (3-D) frequency-selective surface (FSS) based spatial bandpass filter. The meta-atom of our proposed design is inspired by and evolved from the fundamental centrally-loaded pattern which is closely associated with bandpass performance. The inclusion of additional transmission poles and zeros contributes to an ultra-wideband operating spectrum from approximately 21 GHz to 48 GHz and a broad out-of-band rejection. The applicability of equivalent circuit model and the Smith Chart as design aids for 3-D FSS has been substantiated. The proposed meta-atom, leveraging multimaterial additive manufacturing techniques, was implemented in a single substrate with a thickness of 2.8 mm, and its frequency response has been experimentally verified in an anechoic chamber.