Abstract
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.
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