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How is a Microwave Built? Microwaves have elevated the convenience of home to a whole new level. They are designed to fit in wall cabinets or over kitchen islands. They are also constructed with a variety of materials. The cavity magnetron tube emitting microwaves was first invented in 1940 at Birmingham University in England. Percy Spencer realized that this device could be used to heat food when he observed eggs and corn pop cook. Raw Materials Microwave (MW) heating is gaining a lot of attention in the field of mater