Broadband absorber with dispersive metamaterials
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...
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| Format: | Article |
| Language: | English |
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De Gruyter
2023-03-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2022-0777 |
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| author | Han WonHeum Park Q-Han |
| author_facet | Han WonHeum Park Q-Han |
| author_sort | Han WonHeum |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-0fbef859f4b845f5b81362f43fba1f54 |
| institution | Kabale University |
| issn | 2192-8614 |
| language | English |
| publishDate | 2023-03-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-0fbef859f4b845f5b81362f43fba1f542025-02-02T15:46:12ZengDe GruyterNanophotonics2192-86142023-03-0112132443244910.1515/nanoph-2022-0777Broadband absorber with dispersive metamaterialsHan WonHeum0Park Q-Han1Physics, Korea University, Seoul, KoreaPhysics, Korea University, Seoul, KoreaA 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.https://doi.org/10.1515/nanoph-2022-0777broadband absorberelectromagnetic wave absorbersequivalent circuit modellorentz modelmetamaterialperfect electric conductor |
| spellingShingle | Han WonHeum Park Q-Han Broadband absorber with dispersive metamaterials Nanophotonics broadband absorber electromagnetic wave absorbers equivalent circuit model lorentz model metamaterial perfect electric conductor |
| title | Broadband absorber with dispersive metamaterials |
| title_full | Broadband absorber with dispersive metamaterials |
| title_fullStr | Broadband absorber with dispersive metamaterials |
| title_full_unstemmed | Broadband absorber with dispersive metamaterials |
| title_short | Broadband absorber with dispersive metamaterials |
| title_sort | broadband absorber with dispersive metamaterials |
| topic | broadband absorber electromagnetic wave absorbers equivalent circuit model lorentz model metamaterial perfect electric conductor |
| url | https://doi.org/10.1515/nanoph-2022-0777 |
| work_keys_str_mv | AT hanwonheum broadbandabsorberwithdispersivemetamaterials AT parkqhan broadbandabsorberwithdispersivemetamaterials |