Abstract
New airborne radar systems require the design of high power, differential phase shift circulators with increased bandwidth and better thermal performance. In this paper, to meet these requirements a magneto static/microwave/thermal method is proposed to model high power ferrite devices. Magnetic loss mechanisms that bottleneck the power handling /frequency performance of microwave systems 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 optimum operating region for temperature stability in high-power differential phase shift devices is deduced to be below subsidiary resonance and above low field loss. (6 pages)
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