Title :
Microwave and thermal analysis of a high-power ferrite phase shifter
Author :
Dillon, Bernice M. ; Gibson, Andrew A P
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK
fDate :
3/1/2002 12:00:00 AM
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
Keywords :
ferrite circulators; ferrite phase shifters; ferrite-loaded waveguides; finite element analysis; iterative methods; losses; magnetisation; microwave circulators; microwave phase shifters; temperature distribution; thermal analysis; thermal conductivity; thermal stability; bandwidth; bias field; bias frequency; differential phase shift ferrite circulators; ferrite temperature profile; ferrite-loaded waveguides; finite-element methods; heat source; high-power differential phase shift devices; high-power ferrite device model; high-power ferrite phase shifter; iterative approach; iterative method; low field loss; magnetic losses; magnetization; magnetostatic/microwave/thermal method; microwave analysis; nonreciprocal wave propagation; operating region; power dissipation; radar applications; subsidiary resonance; temperature stability; temperature-dependent saturation magnetization; thermal analysis; thermal conductivity; thermal finite-element solver; thermal performance; Electromagnetic heating; Ferrites; Magnetic analysis; Magnetic losses; Magnetic resonance; Magnetostatics; Microwave devices; Saturation magnetization; Temperature; Thermal conductivity;
Journal_Title :
Magnetics, IEEE Transactions on
