Ferrite rotary-field phase shifters with reduced cross-section

Practical ferrite rotary-field phase shifters can be built for the 1.3-GHz frequency region by using a reduced-diameter circular waveguide in which disks of high dielectric constant material and ferrite-filled sections alternate. This approach permits reduction of the guide diameter to about half that needed for uniform filling with garnet material only. Experimental results for feasibility-study units at 2.5 GHz and 1.3 GHz confirm that the reduced-diameter configuration can produce high phase setting accuracy, but with increased insertion loss.<>