RF Shielding Design

An RF shielding design procedure based on a nonuniform transmission-line analogy of shielding is presented. The theory treats the propagation of an EM wave through the walls of a shielding enclosure as a path through the material itself in parallel with one or more paths through defects, seams, or other discontinuities in the shielding structure. Data necessary for the design of a shield are presented in the form of material factors, seam factors, size factors, and others. Factor dependency on frequency is discussed. Two typical design examples are given.