Perfect conversion of a TM surface wave into a TM leaky wave by an isotropic periodic metasurface printed on a grounded dielectric slab

Svetlana N. Tcvetkova, Enrica Martini, Sergei A. Tretyakov, Stefano Maci*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This article presents an exact solution for a perfect conversion of a TM-polarized surface wave (SW) into a TM-polarized leaky wave (LW) using a reciprocal and lossless penetrable metasurface (MTS) characterized by a scalar sheet impedance, located on a grounded slab. On contrary to the known realizations of LW antennas, the optimal surface reactance modulation which is found here ensures the absence of evanescent higher-order modes of the field Floquet-wave expansion near the radiating surface. Thus, all the energy carried by the SW is used for launching the single inhomogeneous plane wave into space without accumulation of reactive energy in the higher-order modes. It is shown that the resulting penetrable MTS exhibits variation from an inductive to a capacitive reactance passing through a resonance. The present formulation complements a previous article of the authors, in which a perfect conversion from TM-polarized SW to TE-polarized LW was found for impenetrable boundary conditions. Here, the solution takes into account the grounded slab dispersion, and it is convenient for practical implementation.

Original languageEnglish
Article number9063504
Pages (from-to)6145-6153
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Volume68
Issue number8
DOIs
Publication statusPublished - Aug 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Antennas
  • Floquet waves (FW)
  • leaky waves (LWs)
  • metasurface (MTS)
  • surface waves (SWs)

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