Dennis Roddy, Professor Emeritus of Electrical Engineering at Lakehead University in Thunder Bay, Ontario, Canada, has taught courses that include Satellite Communications, Communications Systems, Optical Communications, and Analysis and Design of Analog Circuits. He has more than 40 years of experience in both industrial and technical education. His previous books include Radio and Line Transmission, vols.1 and 2, Introduction to Microelectronics, Microwave Technology, and the first two editions of Satellite Communications. In addition, he has coauthored several textbooks and published technical papers and reports on a wide variety of topics.