Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Thermal Design of Ferrite Isolators for Industrial Microwave Equipment [PDF]
AUTHORS	J. Leppin 1974 9 3 251-262
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Abstract Ferrite isolators used to protect magnetrons in industrial microwave equipment may be simpler in design than those for communication applications since reverse attenuation and bandwidth requirements are moderate. On the other hand, high average power and large load reflection call for careful design of cooling parameters. A method is given which yields a constant surface temperature along the ferrite body by means of special tapering of ferrite slab height. This results in minimum isolator length. By proper choice of ferrite material (e.g. yttrium-iron garnet) and careful construction, average power handling of 25 kW at 915 MHz is possible.