Analysis of a Multi-Layer Reconfigurable Hybrid Metamaterial Absorber for Wide-Angle Microwave Absorption, Radar Cross-Section Reduction, and Tunable Optoelectronic Applications

<title>Abstract</title> <p>Background: Reconfigurable metamaterial absorbers are increasingly important for microwave stealth, radar cross-section (RCS) control, electromagnetic compatibility, antenna isolation, and adaptive electromagnetic skins, but many reported absorbers still trade bandwidth against angular stability or tunability. Objective: This paper designs and evaluates a multi-layer hybrid metamaterial absorber integrating a patterned copper resonator, resistive frequency-selective surface, dielectric spacers, a metallic ground plane, and tunable VO₂/graphene-inspired conductivity states for wide-angle microwave absorption, RCS reduction, and optoelectronic reconfigurability. Methodology: Because no laboratory dataset was supplied, a clearly labelled simulated primary dataset was generated for demonstration from a physically constrained full-wave surrogate protocol covering 2,550 frequency-angle-polarization-bias-state observations over 8–18 GHz. The dataset included S11, S21, absorption, normalized impedance, field intensity indices, surface-current indices, RCS reference/proposed values, bandwidth, peak absorption, tunability range, and angular stability. Statistical validation used descriptive statistics, Shapiro–Wilk normality testing, paired comparative testing against a non-reconfigurable baseline, one-way and factorial ANOVA, Tukey post-hoc comparison, regression, Pearson correlation, effect-size estimation, and simulation-to-measurement error analysis on a measurement-surrogate subset. Findings: The proposed design achieved a mean simulated absorption of 91.95% across all conditions, a mean &gt;90% absorption bandwidth of 6.69 GHz, a peak absorption confidence interval of 98.89–99.19%, and a mean RCS reduction of 16.00 dB relative to a metallic reference. The paired comparison against the baseline absorber was statistically significant (p &lt; 0.001; Cohen’s d = 7.63). Novelty: The paper combines hybrid multi-layer impedance matching, tunable material-state control, wide-angle TE/TM evaluation up to 60°, RCS reduction assessment, and formal statistical validation in one publication-oriented framework. Applications: The design is relevant to adaptive stealth surfaces, antenna platforms, smart microwave skins, reconfigurable surfaces, and tunable optoelectronic sensing interfaces.</p>