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A new method to measure permittivity and permeability in nanopowder materials in microwave range

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Abstract

A new method for measuring the electromagnetic properties (permittivity and permeability) of nanopowder materials in a wide microwave region is presented. Unlike previously developed systems, our experimental setup is based on reflection measurements over a short-circuited transmission line combined with the application of a uniform magnetostatic field. When this field is sufficiently high to saturate the material, the effective permeability of the sample equals the permeability of free space, without modifying its electrical properties. Hence, for each frequency, the permittivity can be obtained through the measurement of a single scattering parameter, such as the reflection coefficient. After this first measurement, and once the external field is removed, the reflection coefficient can be used again to obtain the permeability by means of the permittivity value obtained before. As the major advantage, this procedure allows the recording of the experimental data in just one sweep, using one-port measurements, and without modifying the geometrical characteristics of the sample holder. Hence, the measurement process can be easily automated.

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Acknowledgements

The authors want to acknowledge their support by Junta de Castilla y León, under project VA230A11-2, and Ministerio de Ciencia e Innovación of the Spanish Government, under project AIB2010PT-00265.

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Authors and Affiliations

  1. Department of Física Teórica Atómica y Óptica, University of Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain

    Diego González-Herrero

  2. Department of Electricidad y Electrónica, University of Valladolid, Paseo de Belén 7, 47011, Valladolid, Spain

    Jose María Muñoz, Carlos Torres, Pablo Hernández-Gómez & Óscar Alejos

Authors
  1. Diego González-Herrero
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  2. Jose María Muñoz
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  3. Carlos Torres
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  4. Pablo Hernández-Gómez
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  5. Óscar Alejos
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  6. Carlos de Francisco
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Corresponding author

Correspondence to Diego González-Herrero.

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Carlos de Francisco: In memoriam.

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González-Herrero, D., Muñoz, J.M., Torres, C. et al. A new method to measure permittivity and permeability in nanopowder materials in microwave range. Appl. Phys. A 112, 719–725 (2013). https://doi.org/10.1007/s00339-013-7765-5

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  • DOI: https://doi.org/10.1007/s00339-013-7765-5

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