Patent ID: 6396037
Filing Date: 2002-05-28
Classification: H05B

Abstract:
A dielectric heating device, the device including:a plurality of electrically conductive side walls which are electrically interconnected in use and arranged in series to define a heating cavity, at least one pair of adjacent side walls being inclined to each other to define an included angle selected from the group consisting of acute angles and obtuse angles; and at least one electromagnetic power source capable of emitting electromagnetic radiation suitable for dielectric heating, the electromagnetic power source being arranged to feed electromagnetic waves of such radiation into the cavity to cause the cavity to act as a multimode resonant heating cavity, the electromagnetic power source including a microwave generator which generates microwaves having linear polarization, and a waveguide to guide the microwaves away from the microwave generator into the heating cavity, the waveguide being hollow and circular-cylindrical in shape with a curved side wall and having an inlet opening connected to the microwave generator and the wave guide containing a pair of diametrically opposed conversion formations projecting radially inwardly from the curved side wall to convert the linear polarization of the microwaves to circular polarization thereof.