Microwave oven including antenna for radiating microwave

Details Microwave oven including antenna for radiating microwave Microwave oven including antenna for radiating microwave

H - Electricity

05

B

H05B 6/72 (2006.01) F24C 7/02 (2006.01)

Patent

CA 2123654

A microwave oven includes a cavity in which food is accommodated, a magnetron for generating microwaves, and a waveguide to supply microwaves generated from the magnetron into the cavity. The waveguide has substantially a truncated cone configuration in which the cross sectional area at the cavity side is greater than the cross sectional area at the magnetron side, and an output antenna of the magnetron is disposed to project from the bottom of the waveguide at the magnetron side into the inner space of the waveguide. The microwave oven further includes a flat radiation antenna fixed in the inner space of the waveguide around the output antenna of the magnetron while maintaining distances from the waveguide and the output antenna of the magnetron in which no spark is generated. Therefore, the radiation area for emitting the microwaves is increased significantly to improve heating nonuniformity within the cavity.

Four à micro-ondes comportant une cavité pour recevoir les aliments, un magnétron assurant la production des micro-ondes, et un guide d'ondes pour acheminer les micro-ondes vers la cavité contenant les aliments. La configuration du guide d'ondes est essentiellement celle d'un cône tronqué, dont la surface de section droite du côté de la cavité est plus grande que la surface de section droite du côté du magnétron; une antenne de sortie du magnétron est en projection depuis le fond du guide d'ondes du côté magnétron et vers l'espace intérieur du guide d'ondes. Le four à micro-ondes comporte en outre une antenne de rayonnement plate fixée dans l'espace intérieur du guide d'ondes, autour de l'antenne de sortie du magnétron, mais à une certaine distance du guide-d'ondes et de l'antenne de sortie du magnétron, entre lesquels il n'y a aucune production d'étincelles. Par conséquent, l'aire de rayonnement pour l'émission des micro-ondes est significativement augmentée, de même que l'uniformité du chauffage à l'intérieur de la cavité destinée à recevoir les aliments.

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