Method and apparatus for effecting by microwaves a substantially uniform heating of a material in a cavity
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United States of America Patent
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Apr 6, 1982
Issued Date -
N/A
app pub date -
Dec 26, 1979
filing date -
Apr 7, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for accomplishing substantially uniform heating of a dielectric material, e.g., an injection molded plastic, attached to, i.e., filling and engaging the walls of a metal encased cavity using microwave energy supplied simultaneously into the cavity at two different frequencies so that two resonance modes arise within the cavity, the two frequencies being so chosen to differ slightly and so that the resonance modes which arise have no coinciding zero points within the cavity. The apparatus has microwave sources connected by waveguides or coaxial conductors into different locations in the cavity. By avoiding coincidence of zero points of the resonance mode an even uniform heating of the material in the cavity is accomplished.
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