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Microwave Firing At 915 MHz - Efficiency and Implications

  • N. G. Evans (a1) and M. G. Hamlyn (a1)

The conversion efficiency of electrical to microwave power by magnetrons operating at 896 / 915 MHz is significantly greater than that of magnetrons operating at 2.45 GHz. The increased efficiency at this frequency improves the prospects of microwave firing being adopted as a commercially viable process but the change in frequency alters the microwave-material interactions that take place.

This paper discusses the influence and implications of using 896 / 915 MHz for firing ceramics and compares dielectric property data at both frequencies. The results suggest that using the lower frequency will result in more efficient heating.

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1. Bratt, M.J., Process Technology for Firing Ceramic Products with Microwave Energy, PhD thesis, April 1995, Staffordshire University.
2. Dielectric Heating for Industrial Processes, p24. Dielectric Heating Working Group, Hulls, Chairman P., Secretary De HoeJ-M. Published by U.I.E. 1992
3. Metaxas, A.C., Meredith, R., Industrial Microwave Heating. IEE Power Engineering Series 4. Peter Peregrinus Ltd 1988.
4. Hutcheon, R., de Jong, M., Adams, F.., J. icrowave Power and Electromagnetic Energy vol 27(2) pp 93102, 1992.
5. Evans, N.G., The Dielectric Properties of Ceramics at 2.45 GHz and their Influence on Microwave Firing, PhD thesis, April 1995, Staffordshire University.
6. Arai, M., Binner, J.G.P., Bowden, A.L., Cross, T.E., Evans, N.G., Hamlyn, M.G., Hutcheon, R., Morin, G., Smith, B., Ceramic Transactions Volume 36. Proc of the Symp ‘Microwaves: Theory and Application in Materials Processing II' 1993 pp539546
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  • EISSN: 1946-4274
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