The finite element method has by now been employed to characterize longitudinally magnetized circular, elliptical, and quadruple ridge gyromagnetic waveguides. Special cases have included ferrite rods on the axis of circular, triple, and quadruple ridge waveguides. The purpose of this paper is to employ this technique to investigate Faraday rotation in quadruple ridge waveguide with ferrite tiles on each open face. The topology in question has application in the design of high power variable power dividers in satellite work. © 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11, 148–155, 2001