Software consultant Pryor describes how to use the modeling software COMSOL Multiphysics (version 4.3a) to model a radio frequency wave guide module that is widely used in several applications. After working through the modeling process step-by-step, he then explores the consequences of changing the length of different individual stubs through variations on the three stud tuner model. The accompanying disk contains models and four-color figures from the book. Annotation ©2013 Book News, Inc., Portland, OR (booknews.com)