CGO-Driven Design of Magnetic Material and Plasma Integrated Next-Generation Broadband Pyramidal Microwave Absorber

Abstract

This article introduces an innovative approach utilizing chaos game optimization (CGO) to the design of magnetic materials and plasma-constituted planar absorbers (PAs) and nonplanar absorbers (NPAs) operating within microwave frequencies. The core innovation lies in the meticulous selection of suitable magnetic materials to achieve optimal absorber performance metrics, including minimal reflectivity (MR), minimum thickness (MT), and maximum bandwidth (MBW). In the proposed model, a predefined set of magnetic materials with frequency-dependent medium properties, including permeability, is utilized to fine-tune parameters for respective layers of absorbers. Emphasizing the significance of magnetic materials, the proposed model reliably predicts the appropriate parameters for layered PAs. Furthermore, this study extends its optimization framework to NPAs, specifically focusing on pyramidal absorbers, and evaluates their performance using magnetic materials. A key advancement in this research is the integration of ferrite tile and plasma slabs in the NPAs, which significantly contributes to the miniaturization of pyramidal absorbers. Consequently, the most efficient NPA demonstrates an impressive MR of -92 dB, and nearly comprehensive band coverage, boasting a remarkable MBW of 26 GHz. Additionally, the study shows that these optimized absorbers efficiently reduce the radar cross section (RCS) across varying incident angles and frequencies. The findings presented in this article hold significant promise across various electromagnetic (EM) applications, encompassing electromagnetic compatibility (EMC), stealth technology, and anechoic chambers. © 1965-2012 IEEE.