Multi-Layer Crystals of Metallic Wires: Analysis of the Transmission Coefficient for Outside and Inside Excitation

Halim Boutayeb (1) , Kouroch Mahdjoubi (1) , Anne-Claude Tarot (1)

1 IETR - Institut d'Electronique et de Télécommunications de Rennes

This paper proposes a new analysis of the transmission coefficient at normal incidence for 2-D periodic crystals (also called Electromagnetic Band Gap (EBG) structures), which are finite in the direction of wave-propagation and are composed of metallic wires. The crystal is considered as a set of parallel Partially Reflecting Surfaces (PRSs), whose transmission and reflection characteristics are obtained rigorously using the Finite Difference Time Domain (FDTD) method. The transmission coefficient of the EBG structure is then obtained by using a plane-wave cascading approach considering single mode interactions between PRSs. The accuracy of the results given by the hybrid method is assessed compared to those obtained directly by the Finite Difference Time Domain (FDTD) method. The minima and maxima envelops and the resonance frequencies of the transmission coefficient are studied, with analytical expressions, for both, excitation from outside and excitation from inside. A discussion is also presented concerning the strength of the coefficient greater than one obtained when the plane-wave source is inside the EBG structure. In addition, by using a transmission line model, a normalized version for this coefficient is proposed, which considers the available power by the source.

Mots clés: Metallic crystals; transmission coefficient; normalisation; gain enhancement

Domaines: Electromagnétisme

Halim Boutayeb, Kouroch Mahdjoubi, Anne-Claude Tarot. Multi-Layer Crystals of Metallic Wires: Analysis of the Transmission Coefficient for Outside and Inside Excitation. Progress In Electromagnetics Research, 2006, 59, pp. 299-324. ⟨10.2528/PIER05102404⟩. ⟨hal-00133689⟩