Microwave heating device

A microwave heating device comprising:

• a heating chamber that accommodates a substance to be heated;
• a microwave generator that generates a microwave;
• a rotating antenna including a ceiling surface, a side-wall surface, and a microwave radiator, the ceiling surface including a first peripheral edge, a second peripheral edge, a third peripheral edge, and a fourth peripheral edge, the side-wall surface including a first side-wall surface which is connected to the first peripheral edge of the ceiling surface, a second side-wall surface which is connected to the second peripheral edge of the ceiling surface, and a third side-wall surface which is connected to the third peripheral edge of the ceiling surface, the fourth peripheral edge of the ceiling surface constituting a horn through which the microwave is radiated, the ceiling surface and the side-wall surface constituting a waveguide structure, the rotating antenna radiating the microwave through the horn from the microwave radiator into the heating chamber;
• a driver that rotates the rotating antenna;
• and
• a controller that controls the microwave generator and the driver,
• wherein the rotating antenna further includes a flange that is formed on a periphery of the side-wall surface so as to face an inner wall surface of the heating chamber and so as to surround the side-wall surface, the flange including a first flange that is connected to the first side-wall surface, a second flange that is connected to the second side-wall surface, and a third flange that is connected to the third side-wall surface,
• at least one of the first flange, the second flange, or the third flange has choke sections that reduce a leakage of the microwave,
• the choke sections are configured to generate a low impedance region in the flange relative to other region of the flange, the low impedance region surrounding side-wall surfaces, and
• the choke sections in the flange include slits formed in the flange, the slits being formed at intervals shorter than one quarter of a wavelength of the microwave.

A microwave heating device comprising:

• a heating chamber that accommodates a substance to be heated;
• a microwave generator that generates a microwave;
• a rotating antenna including a ceiling surface, a side-wall surface, and a microwave radiator, the ceiling surface including a first peripheral edge, a second peripheral edge, a third peripheral edge, and a fourth peripheral edge, the side-wall surface including a first side-wall surface which is connected to the first peripheral edge of the ceiling surface, a second side-wall surface which is connected to the second peripheral edge of the ceiling surface, and a third side-wall surface which is connected to the third peripheral edge of the ceiling surface, the fourth peripheral edge of the ceiling surface constituting a horn through which the microwave is radiated, the ceiling surface and the side-wall surface constituting a waveguide structure, the rotating antenna radiating the microwave through the horn from the microwave radiator into the heating chamber;
• a driver that rotates the rotating antenna;
• and
• a controller that controls the microwave generator and the driver,
• wherein the rotating antenna further includes a flange that is formed on a periphery of the side-wall surface so as to face an inner wall surface of the heating chamber and so as to surround the side-wall surface, the flange including a first flange that is connected to the first side-wall surface, a second flange that is connected to the second side-wall surface, and a third flange that is connected to the third side-wall surface,
• wherein at least one of the first flange, the second flange, or the third flange has choke sections that reduce a leakage of the microwave,
• wherein the side-wall surface of the rotating antenna includes lateral side-wall surfaces on both sides and a rear-end side-wall surface,
• wherein a resonator is formed so as to cover the flange and the rear-end side-wall surface, and
• wherein there exists a resonant space which is surrounded by the rear-end side-wall surface, the flange, and the resonator.

A microwave heating device comprising:

• a heating chamber that accommodates a substance to be heated;
• a microwave generator that generates a microwave;
• a rotating antenna including a ceiling surface, a side-wall surface, and a microwave radiator, the ceiling surface including a first peripheral edge, a second peripheral edge, a third peripheral edge, and a fourth peripheral edge, the side-wall surface including a first side-wall surface which is connected to the first peripheral edge of the ceiling surface, a second side-wall surface which is connected to the second peripheral edge of the ceiling surface, and a third side-wall surface which is connected to the third peripheral edge of the ceiling surface, the fourth peripheral edge of the ceiling surface constituting a horn through which the microwave is radiated, the ceiling surface and the side-wall surface constituting a waveguide structure, the rotating antenna radiating the microwave through the horn from the microwave radiator into the heating chamber;
• a driver that rotates the rotating antenna;
• and
• a controller that controls the microwave generator and the driver,
• wherein the rotating antenna further includes a flange that is formed on a periphery of the side-wall surface so as to face an inner wall surface of the heating chamber and so as to surround the side-wall surface, the flange including a first flange that is connected to the first side-wall surface, a second flange that is connected to the second side-wall surface, and a third flange that is connected to the third side-wall surface,
• at least one of the first flange, the second flange, or the third flange has choke sections that reduce a leakage of the microwave, and
• the choke sections are configured to generate a low impedance region in the flange relative to other region of the flange, the low impedance region surrounding side-wall surfaces.