Electric heating – Microwave heating – Waveguide applicator
Patent
1992-09-25
1994-11-29
Leung, Philip H.
Electric heating
Microwave heating
Waveguide applicator
219693, 219696, 219748, 219750, 426243, 99451, 422 21, H05B 672, H05B 678
Patent
active
053692500
ABSTRACT:
In the heat treatment of food particularly pre-packed food it is important to control the temperature and to provide uniform heat distribution within the article, By using a number of microwave emission slots in a waveguide which are brought to resonance in the presence of pre-packed articles carried over the slots by a conveyor the rate of rise of temperature within the article is controlled without unnecessary energy loss between articles carried seriatim on the conveyor The slots may be set obliquely to the direction of passage of the article Alternatively the slots may be formed by a series of smaller slots staggered obliquely across the waveguide so that the presence of the article tunes each of the slots in turn as it passes over the waveguide. The slots may be covered with low-loss dielectric material to prevent extraneous matter falling into the slots and to space the article from the slots so as to control power dissipated.
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Risman, A Commercial Microwave Oven Using A Near Field Applicator, 1974, pp. 163-167.
APV Corporation Limited
Leung Philip H.
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