Microwave frequency heating apparatus

Claim 1

THE COMBINATION COMPRISING: A MICROWAVE OVEN HAVING A PLURALITY OF BOUNDARY WALLS DEFINING A CAVITY RESONATOR RESONANT IN A PLURALITY OF MODES; A PLURALITY OF MAGNETRON OSCILLATORS EACH HAVING AN INTERDIGITAL ANODE STRUCTURE FOR GENERATING MICROWAVE ENERGY, EACH OSCILLATOR COOPERATING WITH SAID CAVITY TO PROVIDE A DIFFERENT OUTPUT MODE FROM EACH OF SAID OSCILLATORS; MEANS FOR ENERGIZING SAID OSCILLATORS ALTERNATELY; AND MEANS FOR MOUNTING SAID OSCILLATORS FLUSH WITHIN THE OVEN WALLS AT TWO DIFFERENT PLACES FOR COUPLING THE MICROWAVE ENERGY OF SAID OSCILLATORS DIRECTLY INTO THE INTERIOR OF THE OVEN TO EXCITE THE SAME IN AT LEAST TWO OF SAID MODES AND TO PREVENT SUBSTANTIALLY THE EXCHANGE OF ENERGY BETWEEN SAID MAGNETRON OSCILLATORS, SAID OSCILLATORS TRANSMITTING MICROWAVE ENERGY TO THE INTERIOR OF SAID AREA ALTERNATELY DURING DIFFERENT PERIODS TO PROVIDE UNIFORM AVERAGE ENERGY AT SUBSTANTIALLY ALL POINTS WITHIN THE OVEN, SUCH THAT SAID MICROWAVE OVEN IS EXCITED IN AT LEAST TWO DIFFERENT MODES OF THE FORM TELWH DURING SAID DIFFERENT PERIODS, WHERE L, W AND H ARE INTEGERS OF PREDETERMINED VALUES.