四叶草形超宽带漫散射编码超表面

YASIRSaifullah; 杨国敏; 徐丰

doi:10.12000/JR21061

A Four-leaf Clover-shaped Coding Metasurface For Ultra-wideband Diffusion-like Scattering

DOI: 10.12000/JR21061

Key Laboratory for Information Science of Electromagnetic Waves, Fudan University, Shanghai 200433, China

Funds: The National Key Research and Development Program of China (2017YFA0100203)

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Author Bio:
YASIR Saifullah (1989–) is currently pursuing his Ph.D. degree with the School of Information Science and Technology, Fudan University. His research interests include microwave, metamaterial, coding, dielectric and programmable metasurfaces

YANG Guomin (1979–) received the B.S. degree (Hons.) in communication engineering from the Xi’an University of Technology, Xi’an, China, in 2002, the M.S. degree in electronic engineering from Shanghai Jiao Tong University, Shanghai, China, in 2006, and the Ph.D. degree in electrical and computer engineering from Northeastern University, Boston, MA, USA, in 2010. In 2010, he joined the Faculty of the School of Information and Technology, Fudan University, Shanghai, China, where he is currently Professor. He has authored 58 journal publications and 58 conference papers. His research interests include antenna miniaturization, magnetodielectric materials, intelligent metamaterials, frequency-selective surfaces, microwave wireless power transfer, RF energy harvesting, and inverse scattering problems in electromagnetics

XU Feng (1982–) received the B.E. degree (Hons.) in information engineering from Southeast University, Nanjing, China, in 2003, and the Ph.D. degree (Hons.) in electronic engineering from Fudan University, Shanghai, China, in 2008. From 2008 to 2010, he was a Post-Doctoral Fellow with the National Oceanic and Atmospheric Administration (NOAA) Center for Satellite Applications and Research, Camp Springs, MD, USA. From 2010 to 2013, he worked with Intelligent Automation Inc., Rockville, MD, USA, and NASA Goddard Space Flight Center, Greenbelt, MD, USA, as a Research Scientist. In 2012, he was selected for China’s Global Experts Recruitment Program and subsequently returned to Fudan University, in 2013, where he is a Professor. His research interests include electromagnetic scattering modeling, SAR information retrieval, and radar system development. Dr. Xu was a recipient of the second-class National Nature Science Award of China in 2011, the 2014 Early Career Award of the IEEE Geoscience and Remote Sensing Society, and the 2007 SUMMA Graduate Fellowship in the advanced electromagnetics area

Corresponding author: YANG Guomin. E-mail: guominyang@fudan.edu.cn

摘要

摘要: 该文提出了一种结构新颖的四叶草形编码超表面，并利用该超表面实现了超宽带漫散射。所提出的编码超表面具有旋转对称性，它对x极化和y极化波产生相似的反射特性。为了实现1比特编码超表面，该文设计了在15.5～40.5 GHz的频率范围内且相位差为180°±37°的两个超表面单元。采用优化算法得到阵列中单元的最佳排列，从而实现了宽带RCS的缩减。四叶草形编码超表面可以在15.5～26.5 GHz和30.5～40.5 GHz这两个频带内实现10 dB的RCS缩减。该文加工了该编码超表面并与仿真结果进行了比较，从而有效验证了所设计的四叶草形编码超表面可以在宽频带内实现RCS的缩减。
- 编码超表面 /
- 水循环算法 /
- 雷达散射截面 /
- 漫散射 /
- 四叶草形
Abstract: In this paper, a novel four-leaf clover-shaped coding metasurface is proposed and applied to achieve an ultra-wideband diffusion-like scattering. The proposed metasurface element has rotational symmetry; hence, it produces similar reflection characteristics for both x- and y-polarized waves. To realize a 1-bit coding metasurface, two elements are chosen that have a phase difference of 180°±37° from 15.5 to 40.5 GHz. An optimization algorithm is applied to get the best arrangement of unit cells in the array to attain the wideband RCS reduction. The four-leaf clover-shaped metasurface can attain more than 10 dB RCS reduction from 15.5 to 26.5 GHz and 30.5 to 40.5 GHz. A prototype of the proposed design is fabricated, and an experiment is carried out to validate the performance of the metasurface. The proposed concept of four-leaf clover-shaped coding metasurface is an effective solution for wideband RCS reduction applications.
- Coding metasurface /
- Water cycle algorithm /
- Radar Cross-Section (RCS) /
- Diffusion-like scattering /
- Four-leaf clover

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Figure 1. The schematic of proposed unit cell

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Figure 2. Simulation results of reflection phase and magnitude

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Figure 3. Flow chart of water cycle algorithm

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Figure 4. Simulation results of the four-leaf clover-based coding metasurface

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Figure 5. Convergence characteristics of proposed WCA algorithm

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Figure 6. Optimized arrangement of element ‘0’ and element ‘1’ obtained from MATLAB to form the coding matrix

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Figure 7. The 3D scattering patterns of the four-leaf clover-shaped coding metasurface (left column) and the PEC (right column)

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Figure 8. The RCS of proposed coding metasurface and PEC

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Figure 9. The fabricated sample of four-leaf clover-shaped coding metasurface

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Figure 10. Experimental setup in an anechoic chamber

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Figure 11. Comparison of simulation and measurement results

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Table 1. Comparison of our work with earlier works

Ref.	Freq. band (GHz)	σ_R (dB)	Metasurface arrangement	Thickness	FBW (%)
[22]	11.60～18.65	10	Random	0.15λ₀	46
[23]	9.9～19.8	10	Random	0.15λ₀	66
[24]	8～18	10	Random	0.13λ₀	77
[25]	7.2～15.6	10	Random	0.12λ₀	73
[26]	12.2～23.4	10	Spiral coding	0.12λ₀	62
[27]	5.57～7.37	10	Ergodic	0.06λ₀	28
[28]	5.8～12.2	10	GA	0.14λ₀	77
[29]	6.94～9.23	10	GA	0.05λ₀	28
[20]	12～24	10	GA	0.12λ₀	66
[30]	8～15	10	Random	0.10λ₀	0.47
This work	15.5～26.5, 30.5～40.5	10	WCA	0.13λ₀	80
λ₀ is the free-space wavelength corresponding to the center frequency of the operation bandwidth. FBW: The fractional bandwidth FBW= (f_H – f_L)/f_c, f_c = (f_H + f_L) /2 σ_R: RCS reduction

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