FDTD Simulations of Modulated Metasurfaces with Arbitrarily Shaped Meta-atoms by Surface Impedance Boundary Condition

Authors

  • Yanmeng Hu Department of Communication Engineering Nanjing University of Science and Technology, Nanjing, 210094, China
  • Quanen Zhou Department of Communication Engineering Nanjing University of Science and Technology, Nanjing, 210094, China limengmeng@njust.edu.cn
  • Xinyu Fang Department of Communication Engineering Nanjing University of Science and Technology, Nanjing, 210094, China limengmeng@njust.edu.cn
  • Mengmeng Li Department of Communication Engineering Nanjing University of Science and Technology, Nanjing, 210094, China

DOI:

https://doi.org/10.13052/2021.ACES.J.361201

Keywords:

Thin-layer model, metasurface, FDTD, impedance boundary condition

Abstract

In this paper, we propose a reduced-complexity finite difference time domain (FDTD) simulations of modulated metasurfaces with arbitrary unit cells.  The three dimensional (3D) physical structure of the metasurface is substituted by a spatially varying surface impedance boundary condition (IBC) in the simulation; as the mesh size is not dictated by sub-wavelength details, considerable advantage in space- and time-step is achieved. The local parameters of the IBC are obtained by numerical simulation of the individual unit cells of the physical structure, in a periodic environment approximation, in the frequency domain. As the FDTD requires an appropriate time domain impulse-response, the latter is obtained by broad-band frequency simulations, and vector fitting to an analytic realizable time response. The approach is tested on metasurface structures with complex unit cells and extending over 10 ××10 wavelengths, using a standard PC with 64GB RAM.

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Author Biographies

Yanmeng Hu, Department of Communication Engineering Nanjing University of Science and Technology, Nanjing, 210094, China

Yanmeng Hu received the B.S. degree in Electronic Information Science and Technology from the Henan University Minshen College, Kaifeng China, in 2017. She is pursuing the master’s degree in integrated circuit engineering in the Nanjing University of Science and Technology, Nanjing, China. Ms. Hu’s current research interest is electromagnetic analysis of multiscale problems.

Mengmeng Li, Department of Communication Engineering Nanjing University of Science and Technology, Nanjing, 210094, China

Mengmeng Li received the B.S. degree (Hons.) in physics from Huaiyin Normal College, Huai’an, China, in 2007, and the Ph.D. degree in electromagnetic field and microwave technology from the Nanjing University of Science and Technology, Nanjing, China, in 2014. From 2012 to 2014, he was a Visiting Student

with the Electronics Department, Politecnico di Torino, Turin, Italy, and also with the Antenna and EMC Laboratory (LACE), Istituto Superiore Mario Boella, Turin, where he carried out fast solver for multiscale simulations. Since 2014, he has been with the Department of Communication Engineering, Nanjing University of Science and Technology, where he has been an Assistant Professor, Associate Professor, and Professor since 2020. In 2017, he was a Visiting Scholar with Pennsylvania State University, Pennsylvania, PA, USA. His current research interests include fast solver algorithms, computational electromagnetic solvers for circuits, signal integrity analysis, and multiscale simulations.

Dr. Li was a recipient of the Doctoral Dissertation Award of Jiangsu Province in 2016, the Young Scientist Award at the ACES-China Conference in 2019, and five student paper/contest awards at the international conferences with the students. He is an active reviewer for many IEEE journals and conferences. He is an Associate Editor of the IEEE Antennas and Propagation Magazine, IEEE Open Journal of Antennas and Propagation (OJAP), and IEEE Access, and a Guest Editor of OJAP.

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Published

2021-12-01

How to Cite

[1]
Y. . Hu, Q. . Zhou, X. Fang, and M. Li, “FDTD Simulations of Modulated Metasurfaces with Arbitrarily Shaped Meta-atoms by Surface Impedance Boundary Condition”, ACES Journal, vol. 36, no. 12, pp. 1509–1517, Dec. 2021.

Issue

2021: Vol 36 Iss 12

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