Complex permeability and permittivity variation of carbonyl iron rubber in the frequency range of 2 to 18 GHz

Gama, Adriana Medeiros; Rezende, Mirabel Cerqueira

doi:10.5028/jatm.2010.02015962

Abstract:

The complex dielectric permittivity (e) and magnetic permeability (m) of Radar Absorbing Materials (RAM) based on metallic magnetic particles (carbonyl iron particles) embedded in a dielectric matrix (silicon rubber) have been studied in the frequency range of 2 to 18 GHz. The relative permeability and permittivity of carbonyl iron-silicon composites for various mass fractions are measured by the transmission/reflection method using a vector network analyzer. The concentration dependence of permittivity and permeability on the frequency is analyzed. In a general way, the results show that e´ parameter shows a more significant variation among the evaluated parameters (e", m", m'). The comparison of dielectric and magnetic loss tangents (e"/e" and m"/m', respectively) shows more clearly the variation of both parameters (e and m) according to the frequency. It is also observed that higher carbonyl iron content fractions favor both dielectric and magnetic loss tangents.

Keywords:
Carbonyl iron; Silicon; Permeability; Permittivity; Radar Absorbing Materials (RAM)

Full text is available only in PDF.

REFERENCES

Bartley, P.; Begley, S., 2006, "Materials measurement", Available at: <http://www.die.uniroma1.it/personale/frezza/biblioteca/dispense/MisureMateriali.pdf>.
» http://www.die.uniroma1.it/personale/frezza/biblioteca/dispense/MisureMateriali.pdf
Deng, L.J., et al., 1999, "The development and application of magnetic materials in the field of RAM", J Funct Mater, Vol. 30, N. 2, pp. 118-121.
Feng, Y.B., et al., 2006, "Electromagnetic and absorption properties of carbonyl iron/rubber radar absorbing materials", IEEE Transactions on Magnetics, Vol. 42, N.3, pp. 363-368.
Feng, Y.B.; Qiu, T.; Shen, C.Y., 2007, "Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite", Journal of Magnetism and Magnetic Materials, Vol. 318, N. 1-2, pp. 8-13.
Gama, A.M., 2009, "Comportamento da permissividade e permeabilidade complexas, de 2 a 18 GHz, de absorvedores de micro-ondas à base de ferro carbonila e ferrita de MnZn", Tese de doutorado, ITA.
Giannakopouou, T.; Kontogeorgakos, A.; Kordas, G., 2003, "Single-layer Microwave absorbers: influence of dielectric and magnetic losses on the layer thickness", J Magn Mater, Vol. 263, pp. 173.
Liu, A.X., et al., 2003, "Preparation and microwave absorbing property of nanosize PSZFe magnetic particles", Acta Poly Sin. N. 5, pp. 757-760.
Nelson, S.O., 2005, "Density-permittivity relationships for powdered and granular materials", IEEE Trans Instrum Meas., Vol. 54, N. 5, pp. 2033-2040.
Park, M.J.; Choi, J.; Kim, S.S., 2000, "Wide bandwidth pyramidal absorbers of granular ferrite and carbonyl iron powders". IEEE Transactions on Magnetics, Vol. 36, N. 5, pp. 3272-3274.
Yong, W.; Afsat, M.N.; Grignon, R., 2003, "Complex permittivity and permeability of carbonyl iron powders at microwave frequencies", IEEE Antennas and Propagation Society Int Symp, Vol. 4, pp. 619-622.
Yusoff, A.N., et al., 2002, "Electromagnetic and absorption properties of some microwave absorbers", Journal of Applied Physics, Vol. 92, N. 2, pp. 876-882.

Publication Dates

Publication in this collection
Jan-Apr 2010

History

Received
29 Sept 2009
Accepted
13 Nov 2009

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] Bartley, P.; Begley, S., 2006, "Materials measurement", Available at: <http://www.die.uniroma1.it/personale/frezza/biblioteca/dispense/MisureMateriali.pdf>.
» http://www.die.uniroma1.it/personale/frezza/biblioteca/dispense/MisureMateriali.pdf

[2] Deng, L.J., et al., 1999, "The development and application of magnetic materials in the field of RAM", J Funct Mater, Vol. 30, N. 2, pp. 118-121.

[3] Feng, Y.B., et al., 2006, "Electromagnetic and absorption properties of carbonyl iron/rubber radar absorbing materials", IEEE Transactions on Magnetics, Vol. 42, N.3, pp. 363-368.

[4] Feng, Y.B.; Qiu, T.; Shen, C.Y., 2007, "Absorbing properties and structural design of microwave absorbers based on carbonyl iron and barium ferrite", Journal of Magnetism and Magnetic Materials, Vol. 318, N. 1-2, pp. 8-13.

[5] Gama, A.M., 2009, "Comportamento da permissividade e permeabilidade complexas, de 2 a 18 GHz, de absorvedores de micro-ondas à base de ferro carbonila e ferrita de MnZn", Tese de doutorado, ITA.

[6] Giannakopouou, T.; Kontogeorgakos, A.; Kordas, G., 2003, "Single-layer Microwave absorbers: influence of dielectric and magnetic losses on the layer thickness", J Magn Mater, Vol. 263, pp. 173.

[7] Liu, A.X., et al., 2003, "Preparation and microwave absorbing property of nanosize PSZFe magnetic particles", Acta Poly Sin. N. 5, pp. 757-760.

[8] Nelson, S.O., 2005, "Density-permittivity relationships for powdered and granular materials", IEEE Trans Instrum Meas., Vol. 54, N. 5, pp. 2033-2040.

[9] Park, M.J.; Choi, J.; Kim, S.S., 2000, "Wide bandwidth pyramidal absorbers of granular ferrite and carbonyl iron powders". IEEE Transactions on Magnetics, Vol. 36, N. 5, pp. 3272-3274.

[10] Yong, W.; Afsat, M.N.; Grignon, R., 2003, "Complex permittivity and permeability of carbonyl iron powders at microwave frequencies", IEEE Antennas and Propagation Society Int Symp, Vol. 4, pp. 619-622.

[11] Yusoff, A.N., et al., 2002, "Electromagnetic and absorption properties of some microwave absorbers", Journal of Applied Physics, Vol. 92, N. 2, pp. 876-882.

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