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Abstract

Structural radar absorber has important application in stealth field for its ability to effectively absorb incoming radar wave and to bear the load at the same time. Metasurface absorbers can achieve nearly-perfect absorption of radar wave, and have characteristics of light weight and thin structure, but their bandwidth are usually narrow. To solve this problem, a new method of broadening the bandwidth of metasurface absorber is proposed in this work. With varactor and PIN diode integrated in a hybrid manner, the continuous tunning and discrete switching are combined together to broaden the effective absorption bandwidth of the absorber. Using this method, an ultra-wideband tunable metasurface absorber is designed and the absorbing mechanism is analyzed in depth. By changing the bias voltages of PIN diodes and varactors, the absorbing frequency can be continuously tuned within a wide band from 4.57 GHz to 8.51 GHz. Measured results verify the low radar cross section characteristics of the absorber and the effectiveness of the design method. The proposed method is simple and feasible, and can be extended to other broadband structure design.

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Authors and contacts

Corresponding author:Li Tong,tongli8811@sina.com

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 61701523, 61801508), the Natural Science Basic Research Program of Shaanxi Province, China (Grant Nos. 2020JM-350, 20210110, 20200108, 2020022), the Postdoctoral Innovative Talents Support Program of China (Grant Nos. BX20180375, 2019M653960), and the College Students’ Innovation and Entrepreneurship Training Program, China (Grant Nos. 202113468002, S202113468012)

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Cited By

DownLoad: Full-Size Img PowerPoint

偏置电压/V		C/ pF	吸波峰值频率/GHz	RCS减缩峰值频率/GHz
V_d	V_c	C/ pF	仿真	仿真	实测
0.95	0.5	17.41	4.57	4.50	4.48
	9.0	1.45	5.45	5.47	5.52
	30.0	0.71	6.05	6.03	6.16
0	0.5	10.23	5.85	5.90	5.82
	9.0	1.45	7.31	7.26	7.10
	30.0	0.71	8.51	8.46	8.34

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Vol. 71, Issue 3 - 2022-02-05

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