Previous works on this subject tended to be too specialised, making it difficult for students who lack the necessary background in this subject to follow. This book attempts to remedy the situation by providing students from other disciplines the basic background necessary to understand the discussion in this book. In this way, it provides a bridge between basic science and applications/course work. The book begins by presenting the fundamental principles of microwave materials using electrical engineering terminology, hence providing the necessary background before it discusses well-known physical concepts or solid state. Having reviewed the basic concepts, it goes on to discuss a systematic procedure of describing the microwave properties of materials. The organised and comprehensive nature of the book makes it a very useful reading and reference source.