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    Design of multiple-layer microwave absorbing structure based on rice husk and carbon nanotubes

    Authors and affiliations
    Lee Yeng Seng
    F. H. Wee
    H. A. Rahim
    Mohamed Fareq Abdul Malek
    Y. K. You
    Z. Liyana
    A. A. M. Ezanuddin

    1.Department of Electronic Engineering Technology, Faculty of Engineering Technology Universiti Malaysia Perlis (UniMAP)Ara uMalaysia
    2.School of Computer and Communication Engineering Univerisiti Malaysia Perlis (UniMAP)Arau Malaysia
    3.Faculty of Engineering and Information Sciences University of Wollongong in Dubai (UOW)Dubai United Arab Emirates
    4.Radio Communication Engineering Department (RaCED), Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Malaysia

    Abstract
    This paper presents a multiple-layered microwave absorber using rice husk and carbon nanotube composite. The dielectric properties of each layer composite were measured and analysed. The different layer of microwave absorber enables to control the microwave absorption performance. The microwave absorption performances are demonstrated through measurements of reflectivity over the frequency range 2–18 GHz. An improvement of microwave absorption <−20 dB is observed with respect to a high lossy composite placed at bottom layer of multiple layers. Reflectivity evaluations indicate that the composites display a great potential application as wideband electromagnetic wave absorbers. References 1. Y.S.Y. Lee, M.M.F.B.A. Malek, E.M.E.E.M. Cheng, W.W. Liu, K.Y. You, M.N. Iqbal, F.H. Wee, S.F. Khor, L. Zahid, M.F.B. Haji Abd Malek, Experimental determination of the performance of rice husk-carbon nanotube composites for absorbing microwave signals in the frequency range of 12.4–18 GHz. 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