Wideband Polarization-Insensitive Metamaterial Absorber with Perfect Dual Resonances
Title:
Wideband polarization-insensitive metamaterial absorber with perfect dual resonances
Author(s):
Osman Ayop, Mohamad Kamal A. Rahim, Noor Asniza Murad, Noor Asmawati Samsuri
Source:
Applied Physics A
Vol./Issue/Date:
Vol 63
Year:
2016
Page(s):
pp 1-7
Abstract:
This paper presents the analysis of wideband
polarization-insensitive metamaterial absorber with perfect
dual resonances. The structure is designed using lossy FR4
substrate with copper layers. The resonating elements are
designed using the combination of circular ring with modified
circle-shaped structure. The resonating elements are printed
on the top surface of FR4 substrate, while the bottom surface
is printed with full copper ground plane. From the simulation,
the proposed design achieves nearly perfect absorbance at
dual resonant frequency with improved bandwidth compared
to the general circular ring design. Two peaks absorbance of
98.66 and 99.84 % are observed at 9.81 and 10.41 GHz
respectively with full width half maximum (FWHM) bandwidth of 1050 MHz or 10.38 % at normal incident EM wave. The structure is also simulated for different polarization angles and it is observed that the structure can maintain the absorbance characteristic for all polarization angles. The experimental work is done to validate the simulated result. It is confirmed that two peaks absorbance are achieved with
magnitudes of 99.88 and 99.67 % at 10.14 and 10.79 GHz,
respectively. The measured FWHM is 1160 MHz.
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