A Curved Structure for Ultra-Wideband Metamaterial Absorber in UHF Band
2021 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)(2021)
Abstract
An ultra-wideband absorber for UHF band is presented, which is composed of symmetrically incurved metal lines loaded with eight lumped resistors. The structure achieves 106.5% absorption bandwidth between 0.83GHz and 2.72GHz. The absorptance of 99.97% and 99.99% were respectively achieved at 1.0GHz and 2.35GHz. For TE and TM polarizations, when the incident angle is less than 40°, the absorptivity of the absorber is maintained over 80% within 1GHz to 2.75GHz. The structure can be miniaturized at low frequencies with a size of 0.04λ
L
×0.04λ
L
. (λ
L
is the wavelength at 0.83GHz).
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Key words
curved structure,ultra-wideband metamaterial absorber,UHF band,ultra-wideband absorber,symmetrically incurved metal lines,absorption bandwidth,absorptance,frequency 0.83 GHz to 2.75 GHz
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