Some Factors Affecting Energy Conversion in a Microwave Cavity*

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Abstract
Certain integer and non-integer relations are shown to determine the maximum degeneracy (optimum coupling) conditions in large, unloaded multimode cavities of the type used in microwave power processing. Mathematically, the conditions are analogous to problems that have been studied in acoustics. The continuous frequency modulation of a typical two kilowatt magnetron by a full wave, unfiltered power supply has been measured. This figure is taken as a typical source bandwidth (0.6% at 2.45 GHz) for the energy supplied to a cavity. Measurements of energy conversion efficiency, and energy distribution, are given for an 80 liter volume cavity, all the dimensions of which are different. For water filling factors from 0.135 to 3% by volume, the average energy conversion efficiencies range from 53 to 98%. A method for measuring the power available at a point within a system, using a microwave thermometer, is described.

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