This book describes the various devices used in radio communicationand broadcasting to achieve high selectivity filtering andcoupling. After providing a background in the basics of microwavetheory and more detailed material - including a specialchapter on precision and errors in measurement - the readerwill find detailed descriptions, manufacturing processes, and, forthe most useful instances, a number of worked-through formulas,which will allow engineers and technicians to design circuits orcomponents for filtering or coupling applications. Content iscovered in this format across a broad range of fields includingcoaxial cavities, combline filters, band-pass and pass-rejectduplexers, multicouplers, circulators, low-noise amplifiers, helixresonators, and much more.