Microwave oven with a projection for uniform heating within the cavity

A microwave oven, comprising:

• partition plates having interior surfaces defining a cavity for accommodating an object to be heated;
• a microwave generator for supplying microwaves into the cavity;
• and
• a plurality of projections projecting from at least one of the interior surfaces into the cavity for reflecting microwaves supplied by the microwave generator to distribute supplied microwaves within the cavity, the plurality of projections being dispersed on the at least one interior surface of the partition plates such that neighboring projections do not contact each other,
• the projections including a largest projection in an area of the at least one interior surface and plural other projections disposed in the area, the largest projection being located at the center of the area and the plural projections being arranged in at least first and second groups with respect to the largest projection,
• the second group having at least two members that are located at a second region spaced at a second distance from the largest projection, and the first group having at least two members that are located at a first region that is spaced from the largest projection by a first distance that is less than the second distance,
• the members of the first group having a different size than the members of the second group.