Experimental demonstration of phase resonances in metallic compound gratings with subwavelength slits in the millimeter wave regime

We provide experimental evidence of phase resonances in metallic periodic structures in which each period comprises several subwavelength slits of the same width. We have analyzed and measured the response of these structures in the millimeter wave regime and show that phase resonances are characterized by a remarkable minimum in the transmission response, as predicted by numerical calculations. We compare experimental with numerical results, obtaining a very good agreement between them. This experimental confirmation encourages research in compound structures and their multiple potential applications, such as frequency selective surfaces. © 2009 American Institute of Physics.Fil: Navarro Cía, Miguel. Universidad Pública de Navarra; EspañaFil: Skigin, Diana Carina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Física. Grupo de Electromagnetismo Aplicado; ArgentinaFil: Beruete, Miguel. Universidad Pública de Navarra; EspañaFil: Sorolla, Mario. Universidad Pública de Navarra; Españ