Interference Emission Filtering in High Power Microwave Transmitters

Requirements of U. S. Department of Defense and other agencies are that system designers control the spectral characteristics of all new transmitters. The purpose of this paper is to consider the noise outputs of all commonly used microwave tubes and from there proceed to survey the methods of removal and elimination of noise by filtering. Practical design tradeoffs comparing desired stopband attenuation levels versus sacrifice in system VSWR, passband insertion loss, power handling, cost, and size are made. Some recent advances in high power microwave filtering are introduced with recommendations of filter chains usable with various tubes and under various conditions.