Ferrite structures for millimetre wavelengths

The paper gives the results of the extension to higher frequencies than heretofore of work already performed on ferrites and outlines the applications to which these results pertain. The dispersion and absorption occurring in ferrite materials in the presence of an applied magnetic field is briefly mentioned. A description is then given of measurements on typical ferrites with both longitudinal and transverse fields. It is shown how ferrite structures can be made to have nonreciprocal and other useful properties. The paper concludes with a description of the uses of these structures in such applications as switches, duplexers, radiometry and cyclotron resonance detection.