JULIO A. NAVARRO, PhD, is an engineer at Epsilon Lambda Electronics Corporation, where he designs and develops microstrip and waveguide antenna arrays from X- to W-band; specifically, microstrip patch antenna arrays that operate at 24, 35, 60, 77, and 94 GHz. He is currently working on efficient feeding methods for large phased arrays and collision warning systems for the automotive market. Dr. Navarro received his degree from Texas A&M along with a Graduate Engineering Fellowship in 1989, a National Science Foundation Fellowship in 1991, the Edensbarger Electrical Engineering Award in 1992, and a NASA-Lewis Training Grant in 1993. He has published over 20 technical papers and holds two patents in the microwave field. KAI CHANG, PhD, is the E-Systems Endowed Professor in the Department of Electrical Engineering at Texas A&M University, where he teaches and performs research in microwave devices and circuits. Dr. Chang received his degree from the University of Michigan and has received several awards, including the Special Achievement Award from TRW, the Halliburton Research Excellence Award, Distinguished Teaching Award, and Distinguished Research Award from Texas A&M University. He has authored the book Microwave Solid-State Circuits and Applications (published by Wiley in 1994), edited the four-volume Handbook of Microwave and Optical Components, contributed chapters to a number of books, and has published over 250 technical papers on microwave circuits, components, antennas, and subsystems.