The wave impedance in a TE10 rectangular waveguide unloaded and loaded with a centred dielectric slab or a ferrite toroid is analysed. An expression for the reduced wave impedance

reduced waveguide wavelength and reduced propagation constant is derived. Thus the design problem of an impedance tranformer is changed into the solution of the characteristic equation for the reduced propagation constant. Experimental research on the matching of the ferrite waveguide phaser is carried out

and good agreement between theory and experiment is obtained. Both the theoretical and experimental results show that by using the one-step impedance transformer

a ferrite phaser with VSWR<1.25 in 10% bandwidth can be realized.