Ku-band EMI Shielding Effectiveness and Dielectric Properties
of PolyanilineY₂O₃ Composites¹

Muhammad Faisal^a and Syed Khasim^a,b,*

^a Department of Physics, PES Institute of Technology-Bangalore South Campus, 560100, India

^b Department of Physics, University of Tabuk, 71491, Saudi Arabia

*e-mail: syed.pes@gmail.com

Received March 2, 2013;
Revised Manuscript Received June 3, 2013

Abstract—Electromagnetic interference (EMI) shielding has become a phenomenon of great concern and
there is growing demand towards the synthesis of materials with better EMI shielding effectiveness (EMI SE).
This work highlights the preparation of Polyaniline-Yttrium Oxide (PANI–Y₂O₃) composites for EMI shielding
applications in the frequency range from 12.4 to 18 GHz (Ku-band). The structure and morphology of the com-
posites were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scan-
ning electron microscopy (SEM), and transmission electron microscopy (TEM). EMI SE, microwave absorp-
tion and reflection, dielectric properties of the composites are discussed in detail. All the computations were
based on microwave scattering parameters measured by transmission line waveguide technique. The observed
results show absorption dominant EMI shielding in these composites with EMI SE of @@19 to –20 dB,
which mainly depends on the dielectric loss of the composites. Through the results of our observations, we pro-
pose these composites to be potential materials for microwave absorption and EMI shielding applications.

DOI: 10.1134/S0965545X14030055

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