An adjoint-optimized metamaterial absorber only one-twentieth of a wavelength thick achieves over 90% simulated absorption at 7.5 GHz and stays above 70% absorption at 70 degrees incidence.
Metamaterials and negative refractive index,
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Inverse design of ultrathin metamaterial absorber
An adjoint-optimized metamaterial absorber only one-twentieth of a wavelength thick achieves over 90% simulated absorption at 7.5 GHz and stays above 70% absorption at 70 degrees incidence.