Measurement of Ferrite Isolation at 1300 MC

Optimum geometry for ferrite isolators at low microwave frequencies in rectangular waveguide is discussed and measurements are presented which show the feasibility of constructing a practical isolator at 1300 mc using commercially available ferrites. Further data for a narrower line-width ferrite are presented. The high-reverse to forward-loss ratios obtained are in accord with predictions from perturbation theory.