KAI CHANG is a professor in the Electrical Engineering Department of Texas A&M University where he teaches and performs research in microwave devices and circuits. Previously he was a section head at TRW, Inc. where he was responsible for millimeter-wave integrated circuit component and subsystem development. Prior to this, Dr. Chang was a supervisor at Hughes Aircraft Company, where he was involved in the development of microwave circuits, millimeter-wave oscillators, and power combiners. Dr. Chang is the author of a number of book chapters and has published over 90 technical papers on microwave circuits, components, and subsystems. He earned his PhD in electrical engineering at the University of Michigan.