A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium
Spatial Kramers–Kronig (KK) medium provides a new platform to achieve omnidirectionally reflectionless absorption without using any gain elements. However, impedance-matched spatial KK media realized in previous experiments generally have flat geometries with large transverse dimensions. Realizing f...
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sg-ntu-dr.10356-1623892023-04-28T15:46:27Z A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium Li, Quanping Luo, Yu Liu, Dongjue Gao, Yuan Zhang, Jingjing Ran, Lixin Ye, Dexin School of Electrical and Electronic Engineering CNRS International NTU THALES Research Alliances Engineering::Electrical and electronic engineering Anechoic Chamber Gradient Mesoscopic Structure Spatial Kramers–Kronig (KK) medium provides a new platform to achieve omnidirectionally reflectionless absorption without using any gain elements. However, impedance-matched spatial KK media realized in previous experiments generally have flat geometries with large transverse dimensions. Realizing finite spatial KK absorbers in free space background is important for many practical applications but has not been demonstrated experimentally thus far. Here, the concept of spatial KK relation to cylindrical coordinates is extended and a double-resonance space-frequency KK permittivity profile is implemented in a circular geometry. Omnidirectional impedance matching to free space is achieved by truncating the spatial KK absorber at the boundary where the relative permittivity is unity. For the experimental verification, a two-dimensional 6.6-wavelength-diameter doughnut-shaped anechoic chamber is implemented using the designed spatial KK medium. The measured electric field distributions and experimental imaging confirm the omnidirectionally reflectionless property, demonstrating that this miniaturized anechoic chamber is suitable for electrically small scatterer measurements and imaging. The proposed finite spatial KK absorber and fabricated miniaturized anechoic chamber show great promises for electromagnetic shielding and compatibility. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) Submitted/Accepted version This work is supported by the National Natural Science Foundation of China under grants 62071420, 62071417, 62122068, 61871127. Y.L. acknowledges funding support from Singapore Ministry of Education (MOE2018-T2-2-189(S)), A*Star AME IRG Grant (A20E5c0095) and Programmatic Funds (A18A7b0058), National Research Foundation Singapore Competitive Research Program (NRF-RP22-2019-0006 and NRF-CRP23-2019-0007). 2022-10-17T08:04:13Z 2022-10-17T08:04:13Z 2022 Journal Article Li, Q., Luo, Y., Liu, D., Gao, Y., Zhang, J., Ran, L. & Ye, D. (2022). A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium. Advanced Optical Materials, 10(12), 2200381-. https://dx.doi.org/10.1002/adom.202200381 2195-1071 https://hdl.handle.net/10356/162389 10.1002/adom.202200381 2-s2.0-85127716040 12 10 2200381 en MOE2018-T2-2-189(S) A20E5c0095 A18A7b0058 NRF-CRP22-2019-0006 NRF-CRP23-2019-0007 Advanced Optical Materials © 2022 Wiley-VCH GmbH. All rights reserved. This is the peer reviewed version of the following article: Li, Q., Luo, Y., Liu, D., Gao, Y., Zhang, J., Ran, L. & Ye, D. (2022). A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium. Advanced Optical Materials, 10(12), 2200381-, which has been published in final form at https://dx.doi.org/10.1002/adom.202200381. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf |
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Engineering::Electrical and electronic engineering Anechoic Chamber Gradient Mesoscopic Structure Li, Quanping Luo, Yu Liu, Dongjue Gao, Yuan Zhang, Jingjing Ran, Lixin Ye, Dexin A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium |
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Spatial Kramers–Kronig (KK) medium provides a new platform to achieve omnidirectionally reflectionless absorption without using any gain elements. However, impedance-matched spatial KK media realized in previous experiments generally have flat geometries with large transverse dimensions. Realizing finite spatial KK absorbers in free space background is important for many practical applications but has not been demonstrated experimentally thus far. Here, the concept of spatial KK relation to cylindrical coordinates is extended and a double-resonance space-frequency KK permittivity profile is implemented in a circular geometry. Omnidirectional impedance matching to free space is achieved by truncating the spatial KK absorber at the boundary where the relative permittivity is unity. For the experimental verification, a two-dimensional 6.6-wavelength-diameter doughnut-shaped anechoic chamber is implemented using the designed spatial KK medium. The measured electric field distributions and experimental imaging confirm the omnidirectionally reflectionless property, demonstrating that this miniaturized anechoic chamber is suitable for electrically small scatterer measurements and imaging. The proposed finite spatial KK absorber and fabricated miniaturized anechoic chamber show great promises for electromagnetic shielding and compatibility. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Li, Quanping Luo, Yu Liu, Dongjue Gao, Yuan Zhang, Jingjing Ran, Lixin Ye, Dexin |
format |
Article |
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Li, Quanping Luo, Yu Liu, Dongjue Gao, Yuan Zhang, Jingjing Ran, Lixin Ye, Dexin |
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Li, Quanping |
title |
A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium |
title_short |
A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium |
title_full |
A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium |
title_fullStr |
A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium |
title_full_unstemmed |
A miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial Kramers–Kronig medium |
title_sort |
miniaturized anechoic chamber: omnidirectional impedance matching based on truncated spatial kramers–kronig medium |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/162389 |
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1765213872665395200 |