'It's very pleasing to see a second edition of this very important book on electromagnetic transmission lines, now well established as a reference text for today's high-frequency electrical engineering communities. It contains invaluable information about the factors that need to be considered when using transmissions lines in many of today's application areas, such as telecommunications and high-frequency electronics. This new edition contains several additional features likely to be of benefit to the reader. These include coverage of attenuation in the presence of standing waves and propagation in waveguides below cut-off, and a fresh look at the properties of photons to achieve a deeper understanding of electromagnetic propagation. The book is very suitable for undergraduate and graduate-level students, and beyond.' Nick Ridler, National Physical Laboratory (NPL)