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J Electromagn Eng Sci > Volume 16(2); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(2):106-111.
DOI: https://doi.org/10.5515/JKIEES.2016.16.2.106   
Design of Thin RC Absorbers Using a Silver Nanowire Resistive Screen
Junho Lee, Bomson Lee
Department of Electronics and Radio Engineering, Kyung Hee University
Correspondence:  Bomson Lee,Email: bomson@khu.ac.kr
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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