Microwave oven with structure for guiding electromagnetic wave

Details Microwave oven with structure for guiding electromagnetic wave Microwave oven with structure for guiding electromagnetic wave

1997-12-30

1999-03-09

Leung, Philip H.

Electric heating

Microwave heating

Field modification

219748, 219756, H05B 670

Patent

active

058804420

ABSTRACT:
An electromagnetic wave generated from a magnetron of a microwave oven is dispersed into the cooking chamber from an opening through a waveguide. A first plurality of ring-shaped steps are formed radially on a top wall inside the cooking chamber. One ring-shaped step with a larger radius of the first ring-shaped steps is lower in height on the basis of a bottom surface of the cooking chamber than another ring-shaped step with a smaller radius, and a central part with the opening is highest in height. A second plurality of ring-shaped steps are formed radially on a bottom face inside the cooking chamber. The waveguide is provided with a third plurality of ring-shaped steps capable of maintaining a maximum electromagnetic field energy. Thus, the microwave is impartially dispersed while maintaining the maximum electromagnetic field energy in the cooking chamber and in the waveguide, and the cooking efficiency is largely improved.

REFERENCES:
patent: 3619536 (1971-11-01), Boehm
patent: 3764770 (1973-10-01), Saad
patent: 4140888 (1979-02-01), Baron et al.

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