System design development for microwave and millimeter-wave materials processing

Lambert Feher; Manfred Thumm

doi:10.1117/12.469832

10 June 2002 System design development for microwave and millimeter-wave materials processing

Lambert Feher, Manfred Thumm

Proceedings Volume 4720, Intense Microwave Pulses IX; (2002) https://doi.org/10.1117/12.469832
Event: AeroSense 2002, 2002, Orlando, FL, United States

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.

Citation Download Citation

Lambert Feher and Manfred Thumm "System design development for microwave and millimeter-wave materials processing", Proc. SPIE 4720, Intense Microwave Pulses IX, (10 June 2002); https://doi.org/10.1117/12.469832

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