An Ultra-Thin Low-Frequency Tunable Metamaterial Absorber Based on Lumped Element

In this paper, an ultra-thin metamaterial absorber with a stretching transformation (ST) pattern is proposed and fabricated in the low-frequency range. The absorber is composed of dielectric layer, metal patch loading resistor and variable capacitor which produce its tunability. In order to expand t...

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Bibliographic Details
Published inRadioengineering Vol. 27; no. 3; pp. 579 - 584
Main Authors Zhang, G. W., Gao, J., Cao, X. Y., Yang, H. H., Jidi, L. R.
Format Journal Article
LanguageEnglish
Published Spolecnost pro radioelektronicke inzenyrstvi 01.09.2019
Subjects
low-frequency
ST coefficients
tunability
ultra-thin
wideband
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Summary:In this paper, an ultra-thin metamaterial absorber with a stretching transformation (ST) pattern is proposed and fabricated in the low-frequency range. The absorber is composed of dielectric layer, metal patch loading resistor and variable capacitor which produce its tunability. In order to expand the tunable bandwidth, we applied the ST with various coefficients x and y to the unit cell pattern. Measurement and simulated results show that the structure can be tuned to provide a continuously variable reflectivity level of less than -10 dB from 0.68 to 2.13 GHz at bias voltages of 10–40 V. The total thickness of this absorber was only λ/31 of the center frequency. Both measurements and simulated results indicate that this absorber can be thin and achieve a tunable absorption simultaneously.
ISSN:1210-2512
DOI:10.13164/re.2019.0579