This paper presents the design, fabrication, and measurement of triple band metamaterial absorber at 8 GHz, 10 GHz and 12 GHz which are in the X-band frequency range. The unit cell of the metamaterial consists of three concentric copper rings at different radii, printed on 0.8 mm thick FR4 substrate in order to obtain triple resonant frequencies. The highly symmetrical ring structure in nature makes this absorber insensitive to any polarization state of incident electromagnetic (EM) waves for normal incident waves. The proposed structure is capable to operate at wide variations angle of incident wave. The simulated result shows that the triple-band metamaterial absorber achieves high absorbance for normal incident electromagnetic waves of 97.33%, 91.84% and 90.08% at 8 GHz, 10 GHz and 12 GHz respectively, when subjected to normal incident electromagnetic. With metamaterial absorber maintaining 50% of absorbance value, the corresponding full width half maximum (FWHM) are 5.61%, 2.90% and 2.33%. The operating angles in which the metamaterial structure can maintain 50% absorbance at TE mode and TM mode are 670 and 640 respectively. The experimental result verifies that the absorber is well performed at three different resonant frequencies with absorbance greater than 80%.
Mohamad Kamal Abd Rahim,
Noor Asniza Murad,
Noor Asmawati Samsuri,
"Triple Band Circular Ring-Shaped Metamaterial Absorber for X-Band Applications," Progress In Electromagnetics Research M,
Vol. 39, 65-75, 2014. doi:10.2528/PIERM14052402
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