Efficient Conformal Retrodirective Metagrating Operating Simultaneously at Multiple Azimuthal Angles

The Viet HOANG; Jeong-Hae LEE

doi:10.1587/transcom.2020EBP3037

Efficient Conformal Retrodirective Metagrating Operating Simultaneously at Multiple Azimuthal Angles

The Viet HOANG, Jeong-Hae LEE

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This paper presents a conformal retrodirective metagrating with multi-azimuthal-angle operating ability. First, a flat metagrating composed of a periodic array of single rectangular patch elements, two-layer stacked substrates, and a ground plane is implemented to achieve one-directional retroreflection at a specific angle. The elevation angle of the retroreflection is manipulated by precisely tuning the value of the period. To control the energy coupling to the retrodirective mode, the dimensions of the length and width of the rectangular patch are investigated under the effect of changing the substrate thickness. Three values of the length, width, and thickness are then chosen to obtain a high retroreflection power efficiency. Next, to create a conformal design operating simultaneously at multiple azimuthal angles, the rectangular patch array using a flexible ultra-thin guiding layer is conformed to a dielectric cylindrical substrate backed by a perfect electric conductor ground plane. Furthermore, to further optimize the retroreflection efficiency, two circular metallic plates are added at the two ends of the cylindrical substrate to eliminate the specular reflection inside the space of the cylinder. The measured radar cross-section shows a power efficiency of the retrodirective metagrating of approximately 91% and 93% for 30° retrodirected elevation angle at the azimuthal angles of 0° and 90°, respectively, at 5.8GHz.

Publication: IEICE TRANSACTIONS on Communications Vol.E104-B No.1 pp.73-79

Publication Date: 2021/01/01

Publicized: 2020/07/14

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2020EBP3037

Type of Manuscript: PAPER

Category: Electromagnetic Compatibility(EMC)

Authors

The Viet HOANG
Hongik University
Jeong-Hae LEE
Hongik University

Keyword

metagrating, periodic structure, retrodirectivity, conformal surface

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The Viet HOANG, Jeong-Hae LEE, "Efficient Conformal Retrodirective Metagrating Operating Simultaneously at Multiple Azimuthal Angles" in IEICE TRANSACTIONS on Communications, vol. E104-B, no. 1, pp. 73-79, January 2021, doi: 10.1587/transcom.2020EBP3037.
Abstract: This paper presents a conformal retrodirective metagrating with multi-azimuthal-angle operating ability. First, a flat metagrating composed of a periodic array of single rectangular patch elements, two-layer stacked substrates, and a ground plane is implemented to achieve one-directional retroreflection at a specific angle. The elevation angle of the retroreflection is manipulated by precisely tuning the value of the period. To control the energy coupling to the retrodirective mode, the dimensions of the length and width of the rectangular patch are investigated under the effect of changing the substrate thickness. Three values of the length, width, and thickness are then chosen to obtain a high retroreflection power efficiency. Next, to create a conformal design operating simultaneously at multiple azimuthal angles, the rectangular patch array using a flexible ultra-thin guiding layer is conformed to a dielectric cylindrical substrate backed by a perfect electric conductor ground plane. Furthermore, to further optimize the retroreflection efficiency, two circular metallic plates are added at the two ends of the cylindrical substrate to eliminate the specular reflection inside the space of the cylinder. The measured radar cross-section shows a power efficiency of the retrodirective metagrating of approximately 91% and 93% for 30° retrodirected elevation angle at the azimuthal angles of 0° and 90°, respectively, at 5.8GHz.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2020EBP3037/_p

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@ARTICLE{e104-b_1_73,
author={The Viet HOANG, Jeong-Hae LEE, },
journal={IEICE TRANSACTIONS on Communications},
title={Efficient Conformal Retrodirective Metagrating Operating Simultaneously at Multiple Azimuthal Angles},
year={2021},
volume={E104-B},
number={1},
pages={73-79},
abstract={This paper presents a conformal retrodirective metagrating with multi-azimuthal-angle operating ability. First, a flat metagrating composed of a periodic array of single rectangular patch elements, two-layer stacked substrates, and a ground plane is implemented to achieve one-directional retroreflection at a specific angle. The elevation angle of the retroreflection is manipulated by precisely tuning the value of the period. To control the energy coupling to the retrodirective mode, the dimensions of the length and width of the rectangular patch are investigated under the effect of changing the substrate thickness. Three values of the length, width, and thickness are then chosen to obtain a high retroreflection power efficiency. Next, to create a conformal design operating simultaneously at multiple azimuthal angles, the rectangular patch array using a flexible ultra-thin guiding layer is conformed to a dielectric cylindrical substrate backed by a perfect electric conductor ground plane. Furthermore, to further optimize the retroreflection efficiency, two circular metallic plates are added at the two ends of the cylindrical substrate to eliminate the specular reflection inside the space of the cylinder. The measured radar cross-section shows a power efficiency of the retrodirective metagrating of approximately 91% and 93% for 30° retrodirected elevation angle at the azimuthal angles of 0° and 90°, respectively, at 5.8GHz.},
keywords={},
doi={10.1587/transcom.2020EBP3037},
ISSN={1745-1345},
month={January},}

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TY - JOUR
TI - Efficient Conformal Retrodirective Metagrating Operating Simultaneously at Multiple Azimuthal Angles
T2 - IEICE TRANSACTIONS on Communications
SP - 73
EP - 79
AU - The Viet HOANG
AU - Jeong-Hae LEE
PY - 2021
DO - 10.1587/transcom.2020EBP3037
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E104-B
IS - 1
JA - IEICE TRANSACTIONS on Communications
Y1 - January 2021
AB - This paper presents a conformal retrodirective metagrating with multi-azimuthal-angle operating ability. First, a flat metagrating composed of a periodic array of single rectangular patch elements, two-layer stacked substrates, and a ground plane is implemented to achieve one-directional retroreflection at a specific angle. The elevation angle of the retroreflection is manipulated by precisely tuning the value of the period. To control the energy coupling to the retrodirective mode, the dimensions of the length and width of the rectangular patch are investigated under the effect of changing the substrate thickness. Three values of the length, width, and thickness are then chosen to obtain a high retroreflection power efficiency. Next, to create a conformal design operating simultaneously at multiple azimuthal angles, the rectangular patch array using a flexible ultra-thin guiding layer is conformed to a dielectric cylindrical substrate backed by a perfect electric conductor ground plane. Furthermore, to further optimize the retroreflection efficiency, two circular metallic plates are added at the two ends of the cylindrical substrate to eliminate the specular reflection inside the space of the cylinder. The measured radar cross-section shows a power efficiency of the retrodirective metagrating of approximately 91% and 93% for 30° retrodirected elevation angle at the azimuthal angles of 0° and 90°, respectively, at 5.8GHz.
ER -