Microwave heating applicator

H - Electricity – 05 – B

Patent

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Details

H05B 6/74 (2006.01) F24C 7/02 (2006.01)

Patent

CA 2633939

A new, comparatively small type of microwave system based on open-ended applicators is disclosed. The applicator according to the invention uses a main evanescent and a propagating mode in combination, where the combination results in a cancellation of the horizontal magnetic fields at the ends of at least two opposing walls. The effect of this is that the fields propagating out of the applicator become concentrated to the applicator centreline (axis) region, provides an efficient heating of a load or assembly of loads, as well as a stable impedance matching of the system under variable loading conditions due to the mode evanescence, while not leaking energy between adjacent applicators. The applicator can also be used for direct feeding of an underlying small closed metal cavity, for providing (the same favourable) mode conditions to a load in this cavity.

Cette invention concerne un nouveau type de système micro-ondes comparativement petit constitué d'applicateurs à extrémités libres. L'applicateur décrit dans cette invention utilise un mode évanescent principal et un mode de propagation combinés. La combinaison permet de supprimer les champs magnétiques horizontaux aux extrémités d'au moins deux parois opposées. Ce mode de réalisation permet aux champs qui se propagent en dehors de l'applicateur de se concentrer sur la zone de ligne médiane (axe) de l'applicateur. Ce mode de réalisation permet également d'obtenir un chauffage efficace d'une charge ou d'un ensemble de charges ainsi qu'une adaptation d'impédance stable du système dans des conditions de charges variables engendrées par l'évanescence du mode, tout en empêchant la fuite d'énergie entre des applicateurs adjacents. L'applicateur peut également être utilisé pour l'alimentation directe d'une cavité métallique fermée de petite taille sous-jacente, afin d'obtenir des conditions de mode (identiques favorables) pour une charge dans cette cavité.

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