Patent ID: 7230217

Claim:
A rectangular microwave heating applicator arranged to operate at a predetermined frequency, and comprising a microwave enclosure forming a cavity having first and second transverse dimensions and a longitudinal dimension in a direction of propagation of microwave energy, wherein the dimensions are such that, at the predetermined frequency, a main power-transferring TEym 1 n mode with a long vertical wavelength is enhanced, and a significant amplitude of a complementary TEym 2 n mode is created, wherein m 1 , m 2 , and n are positive odd integers and m 2 and n are both less than or equal to m 1 −2, the applicator further comprising two parallel feed slots in a top wall of the applicator connecting the microwave enclosure to a TE10 waveguide, and a metal post arranged at a centerline of the waveguide between the feed slots.