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Broadband absorber with dispersive metamaterials
- Source :
- Nanophotonics, Vol 12, Iss 13, Pp 2443-2449 (2023)
- Publication Year :
- 2023
- Publisher :
- De Gruyter, 2023.
-
Abstract
- A broadband absorber that utilizes a dispersive metamaterial and covers the entire microwave X-band (8–12 GHz) is proposed in the present study. An ideal absorber attached to the surface of a perfect electric conductor requires the permittivity of the absorbing layer to be anomalously dispersive in the targeted broad frequency band. We show that anomalous dispersion of the permittivity for the X-band can be fitted to a two-pole Lorentz oscillator model and realized with the use of a double-layered, square-loop metamaterial. We explain the connection between the two-pole oscillator model and the double-layered, square-loop metamaterial using an equivalent circuit model and present explicit design rules for the metamaterial. We fabricate a 4-mm-thick metamaterial absorber with flexible silicon rubber, a resistor element, and conductive wire using carbon and silver conductive ink. Our metamaterial absorber achieves a reflectance of less than −20 dB over the entire X-band region.
Details
- Language :
- English
- ISSN :
- 21928614
- Volume :
- 12
- Issue :
- 13
- Database :
- Directory of Open Access Journals
- Journal :
- Nanophotonics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.0fbef859f4b845f5b81362f43fba1f54
- Document Type :
- article
- Full Text :
- https://doi.org/10.1515/nanoph-2022-0777