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Abstract

In view of the fact that high-frequency electromagnetic waves mainly enter buildings through windows and glass doors, switchable optically-transparent shielding with broad stopband is increasingly needed. Herein, a novel design for a switchable and optically transparent frequency selective surface (FSS) with ultrawide-stopband is presented in this study. The structure consists of a polymethyl methacrylate (PMMA) layer sandwiched between polydimethylsiloxane (PDMS) layers which contain liquid metal microchannels arranged in an orthogonal Ω-shaped configuration. The mobility of the liquid metal can switch the FSS response from an all-pass to an ultrawide bandstop behavior. The proposed FSS achieves a rejection bandwidth of 18.1 GHz, covering P, L, S, C, X and Ku bands, while maintaining a transparency of 81% and high angular stability up to 80°, regardless of polarization. Furthermore, the mechanism behind the ultrawide stopband and high angular stability is explored through an analysis of reflection and absorption for both TE polarization and TM polarization. Experimental validation under both normal and oblique incidence demonstrates the ultrawide-stopband performance of the fabricated FSS.

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Authors and contacts

Corresponding author:Zhou Yan-Ping,ypzhou11@scu.edu.cn; Yan Li-Ping,liping_yan@scu.edu.cn

Funds:Project supported by the Regional Innovation and Development Joint Funds of the National Natural Science Foundation of China (Grant No. U22A2015), the International Cooperation Project of the Science and Technology Department of Sichuan Province, China (Grant No. 2024YFHZ0282), and the Sichuan University Yibin School-City Cooperation Program, China (Grant No. 2020CDYB-31).

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电磁特性参数	材料名	值
相对介电常数	PDMS	3 – j0.195
	PMMA	2.55 – j0.0051
	EGaIn	1
相对磁导率	PDMS	1
	PMMA	1
	EGaIn	1
电导率/(S·m^–1)	EGaIn	3.4 × 10⁶

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参量	d	s	w	h	h_PDMS	h_PMMA	p
值/mm	4	2	0.5	2	2.7	1.5	10

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入射角 /(°)	频率/GHz	S₁₁/dB	S₂₁/dB	Z_in/Ω		Z₀/Ω
入射角 /(°)	频率/GHz	S₁₁/dB	S₂₁/dB	Re	Im	Z₀/Ω
80	10.5	–15.51	–18.23	2848.8	–565.8	2171.1
80	11.7	–20.79	–18.95	1844.8	–119.0	2171.1
60	12	–14.9	–17.01	765.1	–290.3	754

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文献	透明度/%	可开关或可调谐性能	10 dB 屏蔽带宽/GHz	角度稳定性/(°)
[21]	N	N	3.0—12.0	60
[22]	N	N	7.34—15.0	45
[15]	81.6	N	0.71—1.25 1.73—2.16	60
[16]	84.5	N	8.0—12.0	NM
[27]	N	汞和油的体积调谐	4.08—16.96	NM
[28]	N	变容二极管调谐	0.54—2.5	60
[25]	N	EGaIn注入不同层调谐	<4.5 (底层结构) < 12.2 (顶层结构)	NM
[32]	N	EGaIn注入控制全通到带阻	1.9—3.1 (TM 极化) 3.2—4.2 (TE极化)	45 60
本文设计	81	EGaIn注入控制全通到阻带	< 18.1	80
注: N表示不支持该功能; NM表示未提及

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Vol. 73, Issue 12 - 2024-06-20

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