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A microwave heating apparatus is provided with a waveguide, a heating chamber and a plurality of power feeding ports for communicating the waveguide and the heating chamber, and is adapted to oscillate radio waves so as to uniformly heat a material to be heated in the heating chamber by arranging a

A microwave heating apparatus is provided with a waveguide, a heating chamber and a plurality of power feeding ports for communicating the waveguide and the heating chamber, and is adapted to oscillate radio waves so as to uniformly heat a material to be heated in the heating chamber by arranging a microwave oscillating antenna along the surface of the waveguide facing the segment between the plurality of power feeding ports, or by arranging a microwave oscillating antenna along the surface of the waveguide facing the portion between the power feeding ports.

대표청구항 ▼

A power feeding port arrangement for a microwave heating apparatus comprising: a microwave heating apparatus main body; a heating chamber provided in the microwave heating apparatus main body and having at least two spaced openings in a wall thereof; a waveguide including a guide plate at an outside

A power feeding port arrangement for a microwave heating apparatus comprising: a microwave heating apparatus main body; a heating chamber provided in the microwave heating apparatus main body and having at least two spaced openings in a wall thereof; a waveguide including a guide plate at an outside wall of the heating chamber positioned between the at least two openings of the heating chamber and a guide box having a substantially rectangular prism body and an open major side extending between longitudinal ends of the guide box, the guide box enclosing the two spaced openings of the heating chamber and at least a portion of the guide plate positioned therebetween with the open side facing the guide plate to provide a waveguide with at least a pair of power feeding ports; and a microwave oscillating antenna for emitting radiowaves of a given wavelength, the microwave oscillating antenna protruding into the waveguide from a side of the guide box opposite the open side thereof; wherein the microwave oscillating antenna is spaced from the longitudinal ends of the waveguide by a distance greater than about one quarter of the wavelength of the microwaves emitted thereby; wherein the microwave oscillating antenna is positioned in the waveguide asymmetrically with respect to the longitudinal ends thereof; wherein an interior space of the waveguide is substantially a rectangular prism in which only the microwave oscillating antenna is positioned; and wherein one of the pair of power feeding ports have a larger area than an other of the pair of power feeding ports.