This work is an important addition to the field of array antennas. It also extends the knowledge and applications of Fresnel zone plate lens antennas (FZPLAs) and is the first study of FZPLAs in arrays. Profs. Igor and Oleg Minin have done extensive research and development on FZPLAs. They are among the world’s most famous researchers of the Fresnel zone plate antennas, having written four books (two in Russian) and numerous published articles. The Drs. Minin have made extensive millimeter-wave measurements on Fresnel zone plate antennas and rigorous comparisons with theory. This book is an excellent summary of the state of the art of diffractive optical elements (DOE) and introduces the application to array antennas. The book is very comprehensive and thorough, and offers innovative new ideas.