Polarization-independent wide-angle triple-band metamaterial absorber

TLDR

The study reports the design, fabrication, and measurement of a microwave triple‑band absorber. The absorber uses a compact single unit cell comprising three nested electric closed‑ring resonators above a metallic ground plane separated by a dielectric layer. Simulations and measurements show three absorption peaks at 4.06, 6.73, and 9.22 GHz with rates of 0.99, 0.93, and 0.95, and the absorber remains effective over a wide range of incident angles for both TE and TM polarizations, making it a promising multiband, polarization‑insensitive, wide‑angle absorber for scientific and technical applications.

Abstract

We report the design, fabrication, and measurement of a microwave triple-band absorber. The compact single unit cell consists of three nested electric closed-ring resonators and a metallic ground plane separated by a dielectric layer. Simulation and experimental results show that the absorber has three distinctive absorption peaks at frequencies 4.06 GHz, 6.73 GHz, and 9.22 GHz with the absorption rates of 0.99, 0.93, and 0.95, respectively. The absorber is valid to a wide range of incident angles for both transverse electric (TE) and transverse magnetic (TM) polarizations. The triple-band absorber is a promising candidate as absorbing elements in scientific and technical applications because of its multiband absorption, polarization insensitivity, and wide-angle response.