Experimental Demonstration of a Structured Material with Extreme   Effective Parameters at Microwaves
  Following our recent theoretical studies [M. G. Silveirinha, C. A. Fernandes, Phys. Rev. B, 78, 033108, 2008], it is experimentally verified that an array of crossed metallic wires may behave as a nonresonant material with extremely large index of refraction at microwaves, and may enable the realization of ultra-subwavelength waveguides. 
M. G. Silveirinha, C. A. Fernandes, J. R. Costa, C. R. Medeiros