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      Experimental verification of metamaterial based subwavelength microwave absorbers

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      Author
      Alici, K. B.
      Bilotti, F.
      Vegni, L.
      Özbay, Ekmel
      Date
      2010-10-29
      Source Title
      Journal of Applied Physics
      Print ISSN
      0021-8979
      Publisher
      American Institute of Physics
      Volume
      108
      Issue
      8
      Pages
      083113-1 - 083113-6
      Language
      English
      Type
      Article
      Item Usage Stats
      135
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      146
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      Abstract
      We designed, implemented, and experimentally characterized electrically thin microwave absorbers by using the metamaterial concept. The absorbers consist of (i) a metal back plate and an artificial magnetic material layer; (ii) metamaterial back plate and a resistive sheet layer. We investigated absorber performance in terms of absorbance, fractional bandwidth, and electrical thickness, all of which depend on the dimensions of the metamaterial unit cell and the distance between the back plate and metamaterial layer. As a proof of concept, we demonstrated a λ/4.7 thick absorber of type I, with a 99.8% absorption peak along with a 8% fractional bandwidth. We have shown that as the electrical size of the metamaterial unit cell decreases, the absorber electrical thickness can further be reduced. We investigated this concept by using two different magnetic metamaterial inclusions: the split-ring resonator (SRR) and multiple SSR (MSRR). We have also demonstrated experimentally a λ/4.7 and a λ/4.2 thick absorbers of type II, based on SRR and MSRR magnetic metamaterial back plates, respectively. The absorption peak of the SRR layout is 97.4%, while for the MSRR one the absorption peak is 98.4%. The 10 dB bandwidths were 9.9% and 9.6% for the SRR and MSRR cases, respectively.
      Keywords
      Absorbances
      Absorption peaks
      Artificial magnetic materials
      Electrical thickness
      Experimental verification
      Fractional bandwidths
      Magnetic metamaterials
      Microwave absorbers
      Proof of concept
      Resistive sheets
      Splitring resonators
      Sub-wavelength
      Type II
      Unit cells
      Bandwidth
      Magnetic materials
      Metamaterials
      Plate metal
      Ring gages
      Sheet metal
      Absorption
      Permalink
      http://hdl.handle.net/11693/22174
      Published Version (Please cite this version)
      http://dx.doi.org/10.1063/1.3493736
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Nanotechnology Research Center (NANOTAM) 1006
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