In the era of widespread telecommunication systems, with the consequent crowding of the frequency spectrum, microwave filters and multiplexers play a key role in the development of most communication devices. Their design and tuning can rely on some well-established techniques, but miniaturization, wide frequency ranges and the other challenges of modern engineering relentlessly push these to their limits; the present book is meant to provide theoretical advances and insights addressing some of the common issues in this field. Filters design is here examined in a way alternative to classical...