Professor Jim James has carried out extensive research in Electromagnetics at the Royal Military College of Science where he directs the Wolfson RF Engineering Centre. Much of his recent research work has focussed on microstrip antennas and he is co-author of the IEE book 'Microstrip Antenna Theory and Design'. He was Chairman of the 1983 IEE International Conference on Antennas and Propagation, President of the Institution of Electronic and Radio Engineers in 1985 and is currently Chairman of the IEE Electronics Division.Dr Peter Hall is Reader in Electromagnetics at the Royal Military College of Science. He is co-author of the IEE book 'Microstrip Antenna Theory and Design' and author of many papers and holder of several patents in the areas of microstrip antennas, arrays and feed structures. He is currently a member of the IEE Professional Group on Antennas and Propagation and Vice Chairman of the 1989 IEE International Conference on Antennas and Propagation.