Tullio Rozzi obtained the degree of 'Dottore' in physics from Pisa University in 1965, a PhD in electrical engineering from Leeds University in 1968 and a DSc degree from the University of Bath in 1987. From 1968 to 1978 he was with the Philips Research Laboratories in the Netherlands, working in the area of microwave passive devices and active and passive integrated optics. Subsequently he has held the position of Chair of Electrical Engineering at the University of Liverpool and was later appointed Head of the School of Engineering at the University of Bath. Currently he is head of the Department of Electronics and Control at the University of Ancona, Italy, where he also teaches microwave theory and optics. In 1975 professor Rozzi was awarded the Microwave Prize by the Microwave Theory and Techniques Society of the IEEE. He is a Fellow of the IEE and the IEEE.Mauro Mongiardo is currently an Associate Professor at the University of Perugia, Italy. He received the 'Laurea' degree from the University of Rome and his PhD from the University of Bath. In 1988 he was the recipient of a NATO-CNR research scholarship during which he was a visiting researcher at the University of Bath. He has also been a visiting scientist at the University of Victoria, Canada, working on the time-domain analysis of MMIC. His current research interests are concerned with electromagnetic field computations applied to a variety of problems such as the design of innovative waveguide components for satellite communications, hybrid methods in elctromagnetics and the development of new techniques for efficient field computations.