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How is a Microwave Built? Microwave ovens have taken household convenience to a new level. They are designed to fit in wall cabinets or on top of kitchen islands. They are made from a variety of materials. In 1940 the cavity magnetron device emitting microwaves was invented at Birmingham University in England. Percy Spencer realized that this device could heat food when he watched eggs pop and corn cook. Raw Materials Microwave (MW) heating is gaining popularity in the field of material processing because