Experimental demonstration of a millimeter-wave metallic ENZ lens based on the energy squeezing principle

Research output: Contribution to journalArticlepeer-review


  • Victor Torres
  • Bakhtiyar Orazbayev
  • Victor Pacheco-Pena
  • Jorge Teniente
  • Miguel Beruete
  • Mario Sorolla Ayza
  • Nader Engheta

Colleges, School and Institutes

External organisations

  • Universidad Pública de Navarra
  • University of Pennsylvania


The performance of an epsilon-near zero (ENZ) plano-concave lens is experimentally demonstrated and verified at the D-band of the millimeter-waves. The lens is comprised of an array of narrow metallic waveguides near cut-off frequency, which effectively behaves as an epsilon-near-zero medium at 144 GHz. A good matching with free space is achieved by exploiting the phenomenon of energy squeezing and a clear focus with a transmission enhancement of 15.9 dB is measured. The lens shows good radiation properties with a directivity of 17.6 dBi and low cross-polar components of-34 dB. All results are supported by numerical simulations.


Original languageEnglish
Article number6949057
Pages (from-to)231-239
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Issue number1
Publication statusPublished - 1 Jan 2015


  • energy squeezing, Epsilon-near-zero, metallic lenses, metamaterials, Millimeter wave devices