3D Printed Wideband Hemispherical FSS Dome for Electromagnetic Shielding Applications

Abstract

This work presents the design of a wideband hemispherical dome covering 8-18 GHz frequencies for shielding applications. The wide bandstop response is achieved by suitably combining the bandpass and bandstop characteristics of different resonating elements printed on opposite sides of the non-planar dome. The unit cell of the proposed design consists of three resonators

the first resonator is based on a complementary circular Jerusalem cross geometry, which is placed on the top side of the substrate and exhibits a bandpass response at 8.28 GHz. The other two resonating elements, viz. one circular ring and one square ring, are located on the bottom side of the substrate, and produce bandstop responses at 9.6 and 16.9 GHz, respectively. These elements combinedly result in a wideband shielding response covering from 7.7 to 18.4 GHz with an 82% fractional bandwidth, thus covering both X - and Ku -band frequencies. The primary novelty of this work is the realization of the wideband response on a non-planar hemispherical surface under normal as well as oblique incidence. The full-wave simulation has been carried out by placing the unit cells on the surface using an innovative mapping technique and subsequently validating the response with its unit cell simulation response. © 2025 IEEE.