This newly revised third edition of an Artech House classic, Phased Array Antenna Handbook, Second Edition, offers a complete and up-to-date comprehensive treatment of array antennas and systems. This edition provides a wealth of new material, including expanded coverage of phased array and multibeam antennas. New modern machine learning techniques used for analysis are included. Additional material on wideband antennas and wideband coverage in array antennas are incorporated this book, including new methods, devices, and technologies that have developed since the second edition.A detailed treatment of antenna system noise, sections on antenna pattern synthesis, developments in subarray technology, and in-depth information on array architecture and components are also new features of this book. This book provides complete design details that demonstrate how to size an array system with speed and confidence. Moreover, this book provides expanded coverage of systems aspects of arrays for radar and communications. Supported with numerous equations and illustrations, this practical book helps evaluate basic antenna parameters such as gain, sidelobe levels, and noise. Readers learn how to compute antenna system noise, design subarray geometries for given bandwidth, scan and sidelobe constraints, and choose array illumination tapers for given sidelobe levels.