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In preparing this book the authors have borne in mind the requirements of Physics and Technological students at Colleges and Polytechnics. With suitable choice of sections, material may be found of interest to students preparing for examinations such as the B.Sc. final year Physics, Diploma and advanced Diploma in Technology, B.Sc. final year Engineering, M.Sc., etc. Greater stress has been placed on the importance of fundamental principles rather than on special applications, and in this way the authors feel that the book will more satisfactorily fill the role of a reference work for those engaged in the fields of Electronics or Microwave Physics. As most of the subject matter has been extracted from lecture notes collated over a number of years from numerous sources, the authors apologize for the omission of acknowledgements where due