The possibility of observing superluminal behavior in the propagation of localized microwaves over distances of tens of wavelengths is experimentally demonstrated. These types of waves, better than the evanescent modes of tunneling, can contribute to answering the question on the luminal limit of the signal velocity.
Delay-time investigation of electromagnetic waves through homogeneous medium and photonic crystal left-handed materials Appl. Phys. Lett. 85, 1125 (2004); 10.1063/1.1781742 Delay-time and aging effects on contrast and sensitivity of hydrogen silsesquioxane
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