Improved uniformity of microwave heating by control of the depth

Details Improved uniformity of microwave heating by control of the depth Improved uniformity of microwave heating by control of the depth

1989-06-01

1991-02-05

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055F, 219 1055M, 426107, 426234, 426243, 99DIG14, H05B 680

Patent

active

049907352

ABSTRACT:
A product comprises a shallow container and a load located therein for heating by microwave energy. This product is designed either to be used with, or itself to incorporate, a structure for generating or enhancing at least one mode of the microwave energy of an order higher than a fundamental mode that is determined by boundary conditions resulting from the lateral dimensions of either the container of the load or both. The invention resides in controlling the depth of the load in the container in such a manner that, upon irradiation of the product with the microwave energy, the power absorbed by the load from a higher order mode is at or near a maximum value, while preferably the power absorbed by the load from the fundamental mode is at or near a minimum value. Since uneven heating would ordinarily be associated with the predominance of a fundamental mode, the result of this invention is to increase the intensity of a higher order mode relative to the fundamental mode intensity, and thus provide improved microwave heating uniformity.

REFERENCES:
patent: 2714070 (1955-07-01), Welch
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patent: 4703149 (1987-10-01), Sugisawa et al.
patent: 4816634 (1989-03-01), Lentz et al.
patent: 4841112 (1989-06-01), Peleg
"Aluminum Foil Containers for Microwave Oven Use", International Microwave Power Institute, 19th Annual Meeting, pp. 8-12, Sep. 1984.
Roebuck et al., "Dielectric Properties of Carbohydrate-Water Mixtures at Microwave Frequencies", Journal of Food Science, vol. 37 (1972), pp. 199-204.
Keefer--"The Modelling of Foods as Resonators, in Predicting Microwave Heating Performance"--22nd Annual Microwave Symposium of the International Microwave Power Institute in Cincinnati, Ohio-Hyatt Regency Hotel--Aug. 31'Sep. 2, 1987.
Ball et al.--"Factors Relating to the Performance of Thin Metallized (Susceptor) Films in the Microwave Oven"--23rd Annual Microwave Symposium of the International Microwave Power Institute in Ottawa, Ontario, Canada--Skyline Hotel--Aug. 29-Aug. 31, 1988.

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