In this paper, a tunable metamaterial absorber (MA) based on liquid crystal (LC) with wideband absorption is presented. The design and absorption principle of the absorber is introduced, and the simulation analysis is conducted. The results show that the center resonant frequency of the proposed absorber is 130.0 GHz without a bias voltage. When the bias voltage increases to saturation, the center resonant frequency of the absorber is tuned to 119.9 GHz, with a frequency tunability of 7.8%. Moreover, the tunable absorber exhibits wideband absorption characteristics and maintains absorption above 90% in the frequency range of 127.7 GHz to 132.3 GHz with no bias voltage, with a relative absorption bandwidth of 3.5%. While under the saturation voltage, absorption greater than 90% can be achieved from 117.9 to 121.8 GHz, with a relative absorption bandwidth of 3.3%. The wideband absorption effect of the proposed LC-based tunable MA makes it a promising candidate for applications such as electromagnetic shielding and stealth.

中文翻译：

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具有液晶的可调谐太赫兹超材料宽带吸收器

在本文中，提出了一种基于具有宽带吸收的液晶 (LC) 的可调谐超材料吸收器 (MA)。介绍了吸收器的设计和吸收原理，并进行了仿真分析。结果表明，在没有偏置电压的情况下，所提出的吸收器的中心谐振频率为 130.0 GHz。当偏置电压增加到饱和时，吸收器的中心谐振频率调谐到 119.9 GHz，频率可调性为 7.8%。此外，可调吸收器具有宽带吸收特性，在没有偏压的情况下，在127.7 GHz至132.3 GHz的频率范围内保持90%以上的吸收，相对吸收带宽为3.5%。而在饱和电压下，从117.9到121.8 GHz可以实现大于90%的吸收，相对吸收带宽为 3.3%。所提出的基于 LC 的可调 MA 的宽带吸收效应使其成为电磁屏蔽和隐身等应用的有希望的候选者。