Seminar: Retrieval Of Constitutive Parameters In Metamaterials

The IEEE AP-MTT Columbus Chapter will host this presentation by Professor Stefano Maci of the Department of Information Engineering and Mathematics at the University of Siena.

Abstract: Different metamaterial homogenization equivalences are discussed and corresponding procedures are presented for the retrieval of effective constitutive parameters of metamaterial structures realized by multilayer lossless periodic structures. These structures are modeled as Floquet-wave based multiport networks connected by pieces of transmission lines. A generalized Bloch method is then adopted to find the dominant modes of the volumetric homogenized metamaterial. Starting from the results of this analysis, the constitutive tensors of an equivalent homogeneous material are defined. Different levels of equivalence are defined, denoted as “external equivalence”, “dispersion equivalence”, “single-mode equivalence” and “double-mode equivalence”. The corresponding homogenization processes are characterized by an increasing level of completeness (in the description of the metamaterial behavior) and of sophistication (concerning the processing of the full-wave analysis outcomes). The defined homogenization procedure accounts for dispersion in time (frequency) and space (wavenumber), as well as for anisotropy.

Biography: Stefano MACI is a Professor the University of Siena (UNISI), and responsible of the EM lab (http:// www.dii.unisi.it/~lea/) of UNISI. He is the Director of the UNISI PhD School of Information Engineering and Science, which presently includes about 50 PhD students. Since 2000, he has been responsible of 5 projects funded by the European Union (EU). In 2004 he founded the European School of Antennas (ESoA), a PhD school that presently comprises 35 courses on Antennas, Propagation, Electromagnetic Theory. He Fellow of IEEE, Director of ESoA, a member of the Board of Directors of EuRAAP, a member of the TAB of the URSI Commission B, Chair of the Award Committee of the IEEE AP-S (US), a member of the AP Executive Board of IET (UK), and DL of IEEE. He is author of 10 book chapters, 120 papers published in international journals, and about 400 papers in proceedings of international conferences.