Abstract
Ferrite phase shift and control components designed with low reluctance magnetic bias circuits help to reduce space, weight and energy consumption in microwave systems. Avoiding air-gaps is essential and one suitable geometrical arrangement is the toroidal shaped ferrite positioned inside a rectangular waveguide. A finite element method is presented to model the nonuniform magnetization and partially magnetized state of this type of phase shifter. Using a viscous plastic processing (VPP) method, homogeneous ferrite toroids are fabricated and a twin toroidal phase shifter is designed, assembled and tested. The insertion loss was less than 1 dB over the 9.5 GHz to 10.3 GHz band and return loss of 20 dB was achievable. The phase shift calculation agrees to within 10% of the measured values.
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