Analysis of Electrically Low Profile Wideband Microwave Absorber for C Band Applications

Abstract

In this paper, a wideband polarization-independent broad angular insensitive absorber is proposed with miniaturization novelty. A 12 * 12 octagon element with parasitic elements interconnected by lumped resister has been fabricated on an FR4 structure with an air gap. Large air gap and lower thickness of substrate material as well as corner notched rectangular with octagonal shape causes the improvement of bandwidth. The proposed wideband absorber exhibits absorptivity above 90%. The same has been achieved from 2.84 GHz to 9.12 GHz with 6.27 GHz fractional bandwidth in TE and TM configurations with an angle from 0 • to 30 • . The design is λ/6.67 in size and λ/3.33 in thickness miniaturization at the highest cutoff wavelength. The outcome from the proposed model is highly promising and closely matches the simulated configuration. This design has a vital application in absorbing the signal from aircraft, missiles, submarines, satellites, and radar, termed stealth technology.