Microstrip circuit analog to illustrate extraordinary transmission through compound diffraction gratings

This contribution presents a microstrip implementation of a system exhibiting an electromagnetic response that mimics the response of compound diffraction gratings investigated in the optics community. The transmission response of periodic structures of this kind has attracted a lot of attention in the frame of the so called extraordinary transmission phenomena. Recently, some of the authors have developed physical explanations based on standard transmission line and waveguide theory. This paper shows that, conversely, phenomena observed in the optics frame can be replicated with transmission line and circuit analogs. The identification of such analogies are very fruitful for the understanding of the phenomena but also for the development of design strategies to build practical devices based on such phenomena. This paper shows circuit analogs, traditionally used to explain many physical phenomena, providing physical insight and a pedagogical introduction to extraordinary transmission phenomena.