2020-05-262020-05-262016Torres, V., Mesa Ledesma, F.L., Navarro Cía, M., Rodríguez Berral, R., Beruete, M. y Medina Mena, F. (2016). Accurate circuit modeling of fishnet structures for negative-index-medium applications. IEEE Transactions on Microwave Theory and Techniques, 64 (1), 15-26.0018-94801557-9670https://hdl.handle.net/11441/97167Metallic plates with a two-dimensional (2D) periodic distribution of sub-wavelength apertures are known to exhibit extraordinary transmission of electromagnetic waves. Stacking two or more of such plates gives place to the so-called fishnet structures, which constitute a popular way of achieving an effective negative index medium at frequencies ranging from microwaves to optics. Unfortunately, a general wideband equivalent circuit has not yet been proposed to facilitate its understanding and design. This work presents this circuit model with closed-form expressions for the circuit elements, thus making it possible to obtain the electrical response for this class of structures in a very efficient way. This procedure is much faster than alternative numerical methods at the same time that it retains a high level of accuracy when compared with some other oversimplified models. The circuit model also provides a simple rationale as well as a good physical insight in order to explain the qualitative behavior of such structures, independently of the number of stacked layers.application/pdf12 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Equivalent circuit modelsExtraordinary transmission (ET)Fishnet structuresMetamaterialsNegative index materials (NIMs)info:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess10.1109/TMTT.2015.2504441