Thin glass-fiber/epoxy-composite sheets filled with multiwalled carbon nanotubes (MWCNTs) are manufactured to make lightweight honeycomb sandwich microwave absorbers. A multilayered sandwich structure of thin nanocomposite sheets and honeycomb spacers have been also proposed and developed to work in a wide frequency range. The nanocomposite sheets are prepared from 0.5, 1.0, 1.5, 2.0, and 2.5 wt. % of MWCNTs. A commercially available simulation software computer simulation technology (CST) microwave studio was used for the designing and development of radar absorbing structure (RAS) composed of MWCNTs/glass-fiber/epoxy-composite sheets and honeycomb cores. The measurements of return loss (RL) from sandwich structures with 5 mm and 20 mm honeycomb cores in the Ku band (11–17 GHz) show that maximum RL is achieved at 11 GHz and 16 GHz, respectively. The stacking of three nanocomposite sheets and three 5 mm-thick honeycomb spacers produced a wide band microwave absorber with −10 dB RL over 9 GHz bandwidth.
Microwave Absorbing Properties of Lightweight Nanocomposite/Honeycomb Sandwich Structures
National Centre for Physics,
Islamabad 45320, Pakistan;
Islamabad 45320, Pakistan
Manuscript received April 21, 2015; final manuscript received August 23, 2015; published online September 29, 2015. Assoc. Editor: Roger Narayan.
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Khurram, A. A., Rakha, S. A., Ali, N., Asim, M. T., Guorui, Z., and Munir, A. (September 29, 2015). "Microwave Absorbing Properties of Lightweight Nanocomposite/Honeycomb Sandwich Structures." ASME. J. Nanotechnol. Eng. Med. February 2015; 6(1): 011006. https://doi.org/10.1115/1.4031472
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