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Proceedings Paper

System design development for microwave and millimeter-wave materials processing
Author(s): Lambert Feher; Manfred Thumm
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Paper Abstract

The most notable effect in processing dielectrics with micro- and millimeter-waves is volumetric heating of these materials, offering the opportunity of very high heating rates for the samples. In comparison to conventional heating where the heat transfer is diffusive and depends on the thermal conductivity of the material, the microwave field penetrates the sample and acts as an instantaneous heat source at each point of the sample. By this unique property, microwave heating at 2.45 GHz and 915 MHz ISM (Industrial, Medical, Scientific) frequencies is established as an important industrial technology since more than 50 years ago. Successful application of microwaves in industries has been reported e.g. by food processing systems, domestic ovens, rubber industry, vacuum drying etc. The present paper shows some outlines of microwave system development at Forschungszentrum Karlsruhe, IHM by transferring properties from the higher frequency regime (millimeter-waves) to lower frequency applications. Anyway, the need for using higher frequencies like 24 GHz (ISM frequency) for industrial applications has to be carefully verified with respect to special physical/engineering advantages or to limits the standard microwave technology meets for the specific problem.

Paper Details

Date Published: 10 June 2002
PDF: 6 pages
Proc. SPIE 4720, Intense Microwave Pulses IX, (10 June 2002); doi: 10.1117/12.469832
Show Author Affiliations
Lambert Feher, Forschungszentrum Karlsruhe GmbH (Germany)
Manfred Thumm, Forschungszentrum Karlsruhe GmbH and Univ. Karlsruhe (Germany)

Published in SPIE Proceedings Vol. 4720:
Intense Microwave Pulses IX
Howard E. Brandt, Editor(s)

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