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Frequenz

Journal of RF-Engineering and Telecommunications

Editor-in-Chief: Jakoby, Rolf

Editorial Board Member: Bangert, Axel / Böck, Georg / Bose, Ranjan / Djordjevic, Ivan B. / Ferrari, Philippe / Follmann, Rüdiger / Gaspard, Ingo / Gevorgian, Spartak / Hartnagel, Hans / Hofmann, Klaus / Jondral, Friedrich / Kasper, Erich / Kastell, Kira / Klein, Anja / Knöchel, Reinhard / Kraemer, Rolf / Kuchenbecker, Hans-Peter / Küppers, Franko / Kürner, Thomas / Menzel, Wolfgang / Mönich, Gerhard / Pouhe, David / Rembold, Bernhard / Rohling, Hermann / Schmidt, Lorenz-Peter / Thomä, Reiner / Vossiek, Martin / Weigel, Robert / Weiland, Thomas / Zoubir, Abdelhak

12 Issues per year


IMPACT FACTOR 2015: 0.379

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2191-6349
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Determination of Effective Constitutive Properties of Metal Powders at 2.45 GHz for Microwave Processing Applications

M. Jaleel Akhtar
  • Corresponding author
  • Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
  • Email:
/ Nilesh K. Tiwari
  • Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
/ Jutika Devi
  • Department of Electrical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
/ Morsi Mahmoud
  • Karlsruhe Institute of Technology, IHM, Karlsruhe 76131, Germany
/ Guido Link
  • Karlsruhe Institute of Technology, IHM, Karlsruhe 76131, Germany
/ Manfred Thumm
  • Karlsruhe Institute of Technology, IHM, Karlsruhe 76131, Germany
Published Online: 2014-01-07 | DOI: https://doi.org/10.1515/freq-2013-0083

Abstract

A reflection-transmission based rectangular waveguide approach for measuring the effective constitutive properties of metal powders at 2.45 GHz is presented. The measured effective dielectric properties of these metal powders are quite important for sintering of metal powders using microwaves, which is a new area of research. The proposed method is based on placing the metal powders of varying density into a standard glass tube, which is then positioned inside a specially designed waveguide holder for measuring the scattering coefficients at 2.45 GHz using a vector network analyser. The effective constitutive properties of the metal powders are obtained in terms of the measured scattering coefficients using the proposed two step approach. In order to validate the accuracy of the measured material properties, an electromagnetic core-shell model of the metal powders is developed. Finally, the effective dielectric properties of Cu and stainless steel powders are measured and compared with the values obtained using the electromagnetic model.

Keywords: artificial dielectrics; effective constitutive properties; dielectric measurements; metal powders; microwave sintering; microwave non-destructive testing

About the article

Received: 2013-06-25

Published Online: 2014-01-07

Published in Print: 2014-01-31


Citation Information: Frequenz, ISSN (Online) 2191-6349, ISSN (Print) 0016-1136, DOI: https://doi.org/10.1515/freq-2013-0083. Export Citation

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