A microwave transmission-line network guiding electromagnetic fields   through a dense array of metallic objects
  We present measurements of a transmission-line network, designed for cloaking applications in the microwave region. The network is used for channelling microwave energy through an electrically dense array of metal objects, which is basically impenetrable to the impinging electromagnetic radiation. With the designed transmission-line network the waves emitted by a source placed in an air-filled waveguide, are coupled into the network and guided through the array of metallic objects. Our goal is to illustrate the simple manufacturing, assembly, and the general feasibility of these types of cloaking devices. 
Pekka Alitalo, Sylvain Ranvier, Joni Vehmas, Sergei Tretyakov