This thoroughly revised and updated edition, while retaining the major contents of the previous edition, presents the latest information on the various aspects of microwave engineering. With improved organisation and enriched contents, the book explores the basic principles, characteristics and applications of commonly used devices in the design of various microwave systems. The book begins with a discussion of microwave basics, EM wave theory, transmission line theory, hollow pipe waveguides, microwave junctions, and then goes on to provide in-depth coverage of waveguide components, klystrons, magnetrons and TWTs. It also focuses on solid-state devices and microwave measurements. The book also includes an exercise section with essay type questions, exercise problems, fill in the blanks, match the following and multiple choice questions, designed to reinforce the students' understanding of the concepts. The book is appropriate for undergraduate and postgraduate students of electronics and communication engineering.