This book deals with the structure, physical mechanisms and technical applications of superconducting electronic devices. It presents the fundamentals of superconducting electronics in general, and deals in detail with applications in microwave engineering, for example in SIS mixers and Josephson dc references. Practical aspects, including device production and the choice of suitable materials, as well as the related cryogenic engineering, are treated in special sections, and the impact of high-TC superconductivity is taken into account. Students in electronic engineering and physics will find the book a well-balanced introduction; for professionals it is an excellent overview of a field of fast-growing importance.