Wideband performance analysis of ground-plane cloak designed with polarization-independent randomly patterned metamaterial

Hyunsoo Lee; Il Suek Koh; Yongjune Kim; Yongshik Lee

doi:10.1038/s41598-018-26849-9

Wideband performance analysis of ground-plane cloak designed with polarization-independent randomly patterned metamaterial

Hyunsoo Lee, Il Suek Koh, Yongjune Kim, Yongshik Lee

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A ground-plane cloak is designed based on the quasi-conformal mapping method to hide a perfectly conducting object. It is fabricated with a metamaterial, a mixture of a dielectric and air. Using the dielectric mixing formula, the required volume fraction is calculated for a designed refractive index of the cloak. To guarantee the statistical isotropy of the cloak structure, many small pixels are randomly connected to form the metamaterial. A three-dimensional printing machine is used to implement the whole designed cloak structure. The performance of the cloak is experimentally analyzed over a wide frequency range for both independent polarizations. The measurement is also validated by numerical full-wave simulations. Because the quasi-conformal mapping generates unrealistic refractive indices, less than unity, those are removed. The effect of the truncation is experimentally observed and theoretically analyzed by the ray-tracing method.

Original language	English
Article number	8466
Journal	Scientific reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-26849-9
Publication status	Published - 2018 Dec 1

Bibliographical note

Funding Information:
This work was supported by the Defence Nano Technology Application Center Program of the Defense Acquisition Program Administration and Agency for Defense Development of South Korea. The authors would like to thank Dr. Ilsung Seo for assisting the authors to use the 3D printer.

Publisher Copyright:
© 2018 The Author(s).

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10.1038/s41598-018-26849-9

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abstract = "A ground-plane cloak is designed based on the quasi-conformal mapping method to hide a perfectly conducting object. It is fabricated with a metamaterial, a mixture of a dielectric and air. Using the dielectric mixing formula, the required volume fraction is calculated for a designed refractive index of the cloak. To guarantee the statistical isotropy of the cloak structure, many small pixels are randomly connected to form the metamaterial. A three-dimensional printing machine is used to implement the whole designed cloak structure. The performance of the cloak is experimentally analyzed over a wide frequency range for both independent polarizations. The measurement is also validated by numerical full-wave simulations. Because the quasi-conformal mapping generates unrealistic refractive indices, less than unity, those are removed. The effect of the truncation is experimentally observed and theoretically analyzed by the ray-tracing method.",

author = "Hyunsoo Lee and Koh, {Il Suek} and Yongjune Kim and Yongshik Lee",

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N1 - Funding Information: This work was supported by the Defence Nano Technology Application Center Program of the Defense Acquisition Program Administration and Agency for Defense Development of South Korea. The authors would like to thank Dr. Ilsung Seo for assisting the authors to use the 3D printer. Publisher Copyright: © 2018 The Author(s).

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Wideband performance analysis of ground-plane cloak designed with polarization-independent randomly patterned metamaterial

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