Experimental verification of broadband cloaking using a volumetric cloak   composed of periodically stacked cylindrical transmission-line networks
  Cloaking using a volumetric structure composed of stacked two-dimensional transmission-line networks is verified with measurements. The measurements are done in a waveguide, in which an array of metallic cylinders is inserted causing a short-circuit in the waveguide. The metal cylinders are cloaked using a previously designed and simulated cloak that hides the cylinders and thus enables wave propagation inside the waveguide. 
Pekka Alitalo, Frederic Bongard, Jean-Francois Zurcher, Juan Mosig,   Sergei Tretyakov