Multi-mode cavity resonances are generally considered the most important phenomenon in transferring energy to the load in microwave ovens. There are, however, other important phenomena, caused by scattering and near-fields. This paper deals with the mulit-mode resonant and some other important field types. Some main areas where sufficient knowledge is not available are described and the main problems in applying simplified models are discussed.
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Risman et al. (1987) studied this question.