B. Orazbayev, V. Torres, V. Pacheco-Peña, P. Rodriguez, J. Teniente, M. Beruete, M. Sorolla, M. Navarro‐Cía, N. Engheta
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All-metallic ε-near-zero (ENZ) lens based on ultra-narrow hollow rectangular waveguides: Experimental results
Here we perform numerical and experimental investigation of plano-concave all-metallic ε-near-zero (ENZ) lens with operational frequency f = 144 GHz. The ENZ lens is achieved by stacking an array of narrow hollow rectangular waveguides working near cut-off frequency. Focusing and radiation properties are numerically analyzed and measured. The enhancement of 5.61 dB and directivity of 17.6 dBi are shown. Good agreement between experimental and numerical results is demonstrated.
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