MOHINDER S. GREWAL, PHD, PE, is a Professor of Electrical Engineering in the College of Engineering and Computer Science at California State University, Fullerton. ANGUS P. ANDREWS, PHD, was a Senior Scientist (now retired) at the Rockwell Science Center, in Thousand Oaks, California. CHRIS G. BARTONE, PHD, PE, is a Professor of Electrical Engineering in the Russ College of Engineering and Technology, School of Electrical Engineering and Computer Science at Ohio University, Athens, OH.