Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 60, Issue 12, Pages 5727-5742Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2012.2209196
Keywords
Absorbing boundary conditions; dispersive media; electromagnetic scattering by absorbing media; impedance boundary conditions; multilayered media; resistive sheets
Funding
- NASA/MS Space Grant Consortium Research Infrastructure Program [NG05GJ72H]
- Spanish Ministerio de Ciencia e Innovacion
- European Union FEDER funds [TEC2010-16948, CSD2008-00066]
- Junta de Andalucia [P09-TIC-4595]
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An analytical model is presented for the analysis of multilayer wire media loaded with 2-D arrays of thin material terminations, characterized in general by a complex surface conductivity. This includes the cases of resistive, thin metal, or graphene patches and impedance ground planes. The model is based on the nonlocal homogenization of the wire media with additional boundary conditions (ABCs) at the connection of thin (resistive) material. Based on charge conservation, new ABCs are derived for the interface of two uniaxial wire mediums with thin imperfect conductors at the junction. To illustrate the application of the analytical model and to validate the new ABCs, we characterize the reflection properties of multilayer absorbing structures. It is shown that in such configurations the presence of vias results in the enhancement of the absorption bandwidth and an improvement in the absorptivity performance for increasing angles of an obliquely incident TM-polarized plane wave. The results obtained using the analytical model are validated against full-wave numerical simulations.
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