Variable toroidal ferrite phase shifter

A. Abuelma'Atti, J. Zafar, I. Khairuddin, A. A P Gibson, A. Haigh, I. Morgan

    Research output: Contribution to journalArticlepeer-review


    Careful design of the magnetic bias circuit used in ferrite phase shifters can help to reduce space, weight and energy consumption. Low reluctance circuits must avoid air-gaps and this can be achieved using toroidal-shaped ferrite inserts positioned inside a rectangular waveguide. Here, these ferrite inserts are fabricated using a viscous plastic processing method that avoids machining and produces a continuous magnetic circuit. Finite-element methods are used to initially model the magnetostatic solution for the bias circuit before being used to analyse the microwave performance of a double toroid phase shifter. A closed-form technique is introduced to model the dielectric slab waveguide impedance transformer. The final insertion loss was
    Original languageEnglish
    Pages (from-to)242-249
    Number of pages7
    JournalIET Microwaves, Antennas and Propagation
    Issue number2
    Publication statusPublished - 2009


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