Investigation of corrugated profiles in thin lossy dielectric slabs for wideband absorption up to 100 GHz

The paper compares and optimizes through modeling conductive polymer composite slabs having different architectures of corrugated surfaces, designed to minimize both the reflectivity its sensitivity angle incidence a microwave/millimeter wave signal impinging on surface slab. Simulations using CST Studio software consider Poly-Lactid-Acid as dielectric material since it is widely used for 3D printing offers very good possibilities recycling in frame sustainability green processing. Various profiles corrugation are investigated; triangular, sinusoidal, or square-dot profiles, compared with uniform profile. Parameters such height, width, periodicity corrugations varied order optimize performances terms over large range frequencies, between 20 GHz 100 GHz. configuration considered reflective screen, when lossy slab covers metallic plate mimicking target. goal maintain below 10 dB, ensure up 95% absorption, angles 60°. Guidelines design optimization absorbers proposed specific gauges (Rozanov formalism figure merit) assessment performances. Particular attention devoted feasibility manufacturing structures additive techniques.