Joseph F. White has studied, worked, and taught in all aspects of microwave semiconductor materials, control diodes, and circuit applications. He is thoroughly grounded in the physics and math­ ematics of the field, but has primarily the engineer's viewpoint, combining basic knowledge with experience and ingenuity to gen­ erate practical designs under constraints of required performance and costs of development and production. As a result of his teach­ ing experience and numerous technical papers and oral presenta­ tions, he has developed a clear, well-organized writing style that makes this book easy to use as a self-teaching text, a reference volume, and a design handbook. Dr. White believes that an engineer must have a good understand­ ing of semiconductor physics, a thorough knowledge of microwave circuit theory, at least an elementary acquaintance with transistor drivers, and the ability to check and refine a microwave circuit on a computer terminal to be qualified for modern, creative design of microwave semiconductor control components. These subjects are well covered in approximately the first half of the book; the second half treats the general and specific design of switches, at­ tenuators, limiters, duplexers, and phase shifters, with many ex­ amples drawn from his experience and that of others.