Ferrite toroidal phase shifters in both rectangular and ridge waveguide were studied theoretically and experimentally. The influences of various parameters on the performance of the phase shifter are calculated and discussed. Theoretical analysis shows that, with proper choice of dimensions, the phase shifter may be made very broadband and the loss of the phase shifter may be reduced 16 percent when compared to the case using rectangular waveguides. The phase shift versus frequency characteristics of these two models are shown graphically. The loss factors are approximately 0.8-1.0 dB/360 deg. The experimental results are in good agreement with theory.