Patent ID: 6667466
Filing Date: 2003-12-23
Classification: H05B,Y02B

Abstract:
A microwave cooking appliance comprising:an cooking chamber; a toroidal-shaped waveguide including inner and outer walls, and a bottom surface which collectively define a hollow interior portion exposed to the cooking chamber; a launching zone having first and second end portions, said first end portion opening into the hollow interior portion of the waveguide; a quantity of insulation material arranged within the hollow interior portion, said insulation material being transparent to microwave energy; a magnetron including an antenna for emitting a microwave energy field directed into the cooking chamber through the waveguide, said magnetron being mounted at the second end portion of the launching zone with said antenna extending into the launching zone, wherein the microwave energy field is directed into the launching zone, through the waveguide and into the cooking chamber; and a waveguide cover disposed between the cooking chamber and the bottom surface, wherein the waveguide cover shields the hollow interior portion from cooking byproducts generated in the cooking chamber during a cooking process.