Research Papers

Microwave Absorbing Properties of Lightweight Nanocomposite/Honeycomb Sandwich Structures

[+] Author and Article Information
A. A. Khurram

Experimental Physics Labs,
National Centre for Physics,
Islamabad 45320, Pakistan
e-mail: khuram_qau@yahoo.com

Sobia A. Rakha

Experimental Physics Labs,
National Centre for Physics,
Islamabad 45320, Pakistan
e-mail: sobiaqau@gmail.com

Naveed Ali

Experimental Physics Labs,
National Centre for Physics,
Islamabad 45320, Pakistan
e-mail: naveedness@gmail.com

M. T. Asim

Department of Electrical Engineering,
Pakistan Institute of Engineering and
Applied Sciences (PIEAS),
Nilore 45650, Pakistan
e-mail: atouseefpieas@gmail.com

Zhang Guorui

School of Micro-Electronics and
Solid-State Electronics,
University of Electronic Science and
Technology of China,
Chengdu, Sichuan 610054, China
e-mail: zguorui2015@gmail.com

Arshad Munir

Experimental Physics Labs,
National Centre for Physics,
Islamabad 45320, Pakistan;
Centre of Excellence in Science and
Advance Technologies,
Islamabad 45320, Pakistan
e-mail: arshadmunirepd@gmail.com

1Corresponding author.

Manuscript received April 21, 2015; final manuscript received August 23, 2015; published online September 29, 2015. Assoc. Editor: Roger Narayan.

J. Nanotechnol. Eng. Med 6(1), 011006 (Sep 29, 2015) (6 pages) Paper No: NANO-15-1038; doi: 10.1115/1.4031472 History: Received April 21, 2015; Revised August 23, 2015

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.

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Fig. 1

Scanning electron micrographs of one of the nanocomposite sample (M4)

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Fig. 2

Real and imaginary part of permittivity of nanocomposites as a function of MWCNTs filler wt. %

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Fig. 3

Dependence of matching thickness of the dielectric absorber on the frequency and MWCNT content

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Fig. 4

Return loss curves of M1 to M5 nanocomposites backed by a perfect reflector in Ku band

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Fig. 5

Nanocomposite absorber with Nomex honeycomb spacer backed by metal plate

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Fig. 6

(a) Simulation of the RL for M5 composite with 20 mm-thick honeycomb spacer and (b) simulation of the RL for M5 composite with 5 mm-thick honeycomb spacer

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Fig. 7

(a) Return loss curves of M1 to M5 nanocomposites with 5 mm-thick honeycomb spacer and (b) return loss curves of M1 to M5 nanocomposites with 20 mm-thick honeycomb spacer

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Fig. 8

Imaginary part of complex permittivity versus matching frequency

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Fig. 9

Simulated return loss curves as a function of thickness of honeycomb spacer for M5 nanocomposite sheet

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Fig. 10

Multilayered honeycomb sandwich microwave absorber

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Fig. 11

Return loss versus frequency of multilayered sandwich structured absorber in 2–18 GHz (solid and dashed lines are simulated curves)



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