| Design of Thin RC Absorbers Using a Silver Nanowire Resistive Screen |
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Junho Lee, Bomson Lee |
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Department of Electronics and Radio Engineering, Kyung Hee University |
Correspondence:
Bomson Lee,Email: bomson@khu.ac.kr
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| Abstract |
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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. |
| Key words:
Absorption Bandwidth, Capacitive Screen, Design Equations, Resistive Sheet, Thin Absorber |
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