Jesús Martel (M’08–SM’15) received the Licenciado and Doctor degrees in physics from the University of Seville, Seville, Spain, in 1989 and 1996, respectively. Since 1990, he has performed research with the Microwave Group, University of Seville. He is currently a Professor with the Department of Applied Physics II, University of Seville, Spain, where he was Head of the Department from 2010 to 2018. His current research interest is focused on the numerical analysis of planar transmission lines, the modeling of planar microstrip discontinuities, the design of passive microwave circuits, the techniques in microwave measurements, and the proprieties of artificial media