Abstract: An electromagnetic energy seal for a microwave oven includes a seal plate fixed on an inner wall of a door frame of the oven which is adapted to form an opening. From an upper end of an outer wall of the door frame, an inwardly bent member is extended. Also, slits having a uniform width are formed in the bent member at intervals where the electric field component of the electromagnetic energy utilized by the oven is at a maximum. The use of these slits effectively interrupt the propagation of the electromagnetic energy.

Abstract: A device for protecting a turntable shaft in a microwave oven to prevent the turntable shaft, which is made out of a resinous material, from fusing during the operation of the microwave oven. A protective plate is formed on the lower surface of the turntable in such a manner that a supplementary cavity is formed having its impedance at a maximum at its inlet and a choke cavity is formed having its impedance at a minimum at its inlet. The phenomenon of microwaves concentrating around the shaft is eliminated by fixing the exact dimensional range of both cavities in accordance with the characteristics of the microwaves used.