Ronold W. P. King is the Gordon McKay Professor of Applied Physics, Emeritus at Harvard University, USA. Since joining the Harvard faculty in 1938, he has supervised the research of over 100 Ph.D. students. He is a Life Fellow of the IEEE; a Fellow of the American Physical Society; and a member of the Bavarian Academy of Sciences and the American Academy of Arts and Sciences. He holds the Distinguished Service Award from the University of Wisconsin (1973), the Centennial Medal of the IEEE (1985), the Harold Pender Award from the University of Pennsylvania (1986), the Distinguished Achievement Award of the IEEE Antennas & Propagation Society (1991), and the IEEE Graduate Teaching Award (1997). George J. Fikioris is a researcher at the National Technical University of Athens (NTUA) in Greece. After obtaining his Ph.D. at Harvard University in 1993 he worked for six years as an electronics engineer at the Airforce Research Labratory, Hanscomb, USA before joining the NTUA faculty in 1999. Richard B. Mack is a consultant at his own company, Mack Consulting, where he specialises in electromagnetic measurement techniques.