About the author Robert E. Collin received the B.Sc. degree in engineering physics from the University of Saskatchewan in 1951. He attended Imperial College in England for graduate work and obtained the Ph.D. degree in electrical engineering from the University of London in 1954. From 1954 to 1958 he was a Scientific Officer at the Canadian Armament Research and Development Establishment, where he worked on missile guidance antennas, radomes, and radar systems evaluation. He joined the Electrical Engineering Department at Case Institute of Technology (now Case Western Reserve University), Cleveland, Ohio, in 1958. During his tenure there he has served as Chairman of the Electrical Engineering and Applied Physics Department for five years and also as Interim Dean of Engineering for two years. He is the author/co-author of more than 100 technical papers and several books, including Foundations for Microwave Engineering, Antennas and Radiowave Propagation, a co-author with R. Plonsey of Principles and Applications of Electromagnetic Fields, and a co-editor with F. Zucker and contributing author of Antenna Theory, Parts I and II. Professor Collin is a member of the National Academy of Engineering and a member of the IEEE Antennas and Propagation Society, the IEEE Microwave Theory and Techniques Society, and the USA Commission B of URSI. He is currently a member of the Administrative Committee of the IEEE Antennas and Propagation Society.