A ferrite block with dielectric-clad wire array transmits microwaves at 12-14 GHz where calculation predicts n<0, reported as a transparent negative-index metamaterial, though no direct phase measurement is presented.
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Transparent Negative Index of Refraction Metamaterial Using a Wire Array in a Magnetic Host
A ferrite block with dielectric-clad wire array transmits microwaves at 12-14 GHz where calculation predicts n<0, reported as a transparent negative-index metamaterial, though no direct phase measurement is presented.