Microwave and thermal analysis of a high-power ferrite phase shifter

Bernice M. Dillon, Andrew A P Gibson

    Research output: Contribution to journalArticlepeer-review


    Current radar applications require the design of high-power, differential phase shift ferrite circulators with increased bandwidth and better thermal performance. To meet these requirements, a magnetostatic/microwave/thermal method is proposed to model high-power ferrite devices. Magnetic losses are included in the model, which also has a temperature-dependent saturation magnetization and thermal conductivity. An iterative approach has been implemented which uses the power dissipated by the magnetic losses as the heat source for a thermal finite-element solver. Bias field, frequency, magnetic losses, and magnetization are used to determine the temperature profile in the ferrite for a given input power. The recommended operating region for temperature stability in high-power differential phase shift devices is deduced to be below subsidiary resonance and above low field loss.
    Original languageEnglish
    Pages (from-to)1149-1152
    Number of pages3
    JournalIeee Transactions on Magnetics
    Issue number2 I
    Publication statusPublished - Mar 2002


    • Ferrite-loaded waveguides
    • Finite-element methods
    • Iterative method
    • Nonreciprocal wave propagation
    • Temperature


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