Annular Apertures in Metallic Screens as Extraordinary Transmission and Frequency Selective Surface Structures

Pablo Rodríguez-Ulibarri, Miguel Navarro-Cia, Raul Rodriguez-Berral, F Mesa, F Medina, Miguel Beruete

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14 Citations (Scopus)
485 Downloads (Pure)


A 2-D periodic array of annular apertures (or ring slots) is studied using an accurate circuit model. The model accounts for distributed and dynamic effects associated with the excitation of high-order modes operating above or below cutoff but not far from their cutoff frequencies. This paper allows to ascertain the substantial differences of the underlying physics when this structure operates as a classical frequency selective surface or in the extraordinary-transmission (ET) regime. A discussion of two different designs working at each regime is provided by means of the equivalent circuit approach (ECA), full wave simulation results, and experimental characterization. The agreement between the equivalent circuit calculation applied here and the simulation and experimental results is very good in all the considered cases. This validates the ECA as an efficient minimal-order model and a low computational-cost design tool for frequency selective surfaces and ET-based devices. Additional scenarios such as oblique incidence and parametric studies of the structural geometry are also considered.
Original languageEnglish
Pages (from-to)1-14
Number of pages14
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number99
Early online date15 Aug 2017
Publication statusE-pub ahead of print - 15 Aug 2017


  • annular aperture
  • equivalent circuit
  • extraordinary transmission
  • frequency selective surface
  • millimeter waves


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