Some properties of circular waveguides containing ferrites

The paper describes some results of an experimental investigation of the propagation behaviour of circular waveguides containing longitudinally magnetized ferrite rods. Measurements have been made at 9.250kMc/s using nickel¿zinc ferrite. Reasonable correlation is obtained between experimental and theoretical results for the limiting cases of the thin ferrite rod and the waveguide completely filled with ferrite. Factors determining the propagation behaviour in the partially filled waveguide are discussed and illustrated by experimental results. The dependence of propagation behaviour on ferrite-rod diameter is studied in detail using polystyrene foam and polystyrene as supporting media.