Patent ID: 6933482

Claim:
Microwave heating apparatus comprising cylindrical elongated dielectric microwave applicator with an axial TM type mode, said dielectric applicator being provided with a load chamber for a load to be heated, said load chamber being located in a centred axial position inside the applicator, wherein two microwave feeding points are arranged at the lower end of the applicator for feeding microwave energy in the axial direction of the applicator resulting in Tmnp as the mode in the applicator, where m=1, 2, or 3, n and p>=1; for m=1, the resulting mode is TM1 np wherein the coaxial microwave feeding points are arranged at the same distance from the centre axis of the applicator and separated a×90 degrees where a=1 or 3; for m=2, the resulting mode is TM 2np wherein the coaxial microwave feeding points are arranged at the same distance from the centre axis of the applicator and separated a×45 degrees, where a=1, 3, 5, or 7; and for m=3, the mode is TM 3np , wherein the coaxial microwave feeding points are arranged at the same distance from the centre axis of the applicator and separated a×30 degrees, where a=1, 2, 4, 5, 7, 10, or 11.