Patent ID: 8338761

Claim:
A microwave heating device comprising: a cavity arranged to receive a load to be heated; and a feeding structure for feeding microwaves in the cavity, the feeding structure comprising: a transmission line for transmitting microwave energy generated by a microwave source; and a resonator arranged at a junction between the transmission line and the cavity for operating as a feeding port of the cavity, wherein a dielectric constant of material constituting an interior of the resonator and dimensions of the resonator are selected such that a resonance condition is established in the resonator for the microwave energy generated by the microwave source and impedance matching is established between the transmission line, the resonator and the cavity, wherein the dielectric constant of the material constituting the interior of the resonator is greater than that of material constituting an interior of the transmission line and wherein a cross-sectional dimension of the resonator is selected so as to be smaller than that of the transmission line.