Microwave mixers play a critical role in wireless communication and other micro-wave application employing frequency conversion circuits. Emphasizing practical applications, and based on a review of over one thousand patents on mixers and frequency conversion, this is a comprehensive book for mixer designer and users who want solid ideas for solving their own design challenges. Many of the important and most interesting patents and related circuits are discussed in the several application-oriented chapters. In addition, important contributions from the technical literature are included to provide a solid theoretical foundation. This book contains both introductory and advanced material about active and passive mixers that use bipolar transistor, FET, or diode switching devices. Theory and design details are presented for dozens of important mixer designs, with practical application information derived from the authors' decades of experience.