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Design of Thin RC Absorbers Using a Silver Nanowire Resistive Screen

Lee, Junho;Lee, Bomson

  • Received : 2015.11.10
  • Accepted : 2016.03.11
  • Published : 2016.04.30

Abstract

A resistive and capacitive (RC) microwave absorber with a layer thickness less than a quarter of a wavelength is investigated based on closed-form design equations, which are derived from the equivalent circuit of the RC absorber. The RC absorber is shown to have a theoretical 90% absorption bandwidth of 93% when the electrical layer thickness is $57^{\circ}$ (about ${\lambda}_0/6$). The trade-offs between the layer thickness and the absorption bandwidth are also elucidated. The presented formulation is validated by a design example at 3 GHz. The RC absorber is realized using a silver nanowire resistive rectangular structure with surrounding gaps. The measured 90% absorption bandwidth with a layer thickness of ${\lambda}_0/8$ is 76% from 2.3 GHz to 5.1 GHz in accordance with the theory and EM simulations. The presented design methodology is scalable to other frequencies.

Keywords

Absorption Bandwidth;Capacitive Screen;Design Equations;Resistive Sheet;Thin Absorber

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Acknowledgement

Supported by : National Research Foundation of Korea