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吴天龙、李维等撰写的研究论文被Results in Physics接收并正式发表

发布时间:2020-12-30

       吴天龙、李维等撰写的研究论文“Wideband frequency tunable metamaterial absorber by splicing multiple tuning ranges”被Elsevier旗下期刊Results in Physics接收并正式发表,DOI:10.1016/j.rinp.2020.103753针对当前可调超材料的工作带宽窄的问题,本工作提出了一种多可调波段拼接策略,以实现具有持续强吸收的宽带频率调谐超材料吸波体。该策略是将常见的圆形开口环结构利用缝隙分成多段,并且将PIN二极管桥接在缝隙处。通过改变变容二极管的电容值,每段超结构的吸收频率都能在预设的频率范围内连续可调,更重要的是通过控制PIN二极管的开和关,这些预设的可调波段可以首尾相连从而拓展可调带宽。根据等效电路模型优化了PIN二极管和变容二极管的参数,据此制备了一种多可调波段拼接的超材料吸波体,测试结果显示当PIN二极管开的时候,吸波体的吸收频率可以在2.8-3.9GHz之间连续可调,而当PIN二极管处于关的状态下,吸收频率的可调范围为3.9-4.95GHz。可以很明显的看到,我们只需要控制PIN二极管的开关状态该吸波体即可以在2.8-4.95GHz的宽频范围内实现吸收频率的连续可调,。相比于只有变容二极管的超材料吸波体,其可调谐带宽拓展了一倍。为了进一步展示该策略的可拓展性,我们也设计模拟了另外一种可调超材料吸波体,其结构相比于之前的结构又增加了一组PIN二极管。模拟结果显示该吸波体的可调带宽拓展到了2.9-8.12GHz。因此,这项工作提供了一种实现宽带可调谐的通用方法,并在宽带吸收探测器、可切换吸收器件、无线通信系统和传感器等应用中具有潜在的优越性。

    原文详细摘要如下:A band-splicing strategy is proposed to greatly extend the tunable bandwidth of metamaterial absorbers (MMAs) based on circular split-rings (CSRs) containing varactors. In this strategy, the CSRs are split into multiple segments with the absorption frequency continuously tunable in a pre-set frequency range by adjusting varactors that are bridged by PIN diodes, enabling the splicing of the separately tunable frequency bands with the PIN diodes On/Off. By optimizing the parameters of the PIN diodes and varactors following a circuit model, the designed MMAs experimentally demonstrated a significantly extended tunable frequency band of 2.8-4.95 GHz, which is spliced by the two tuning bands of 2.8-3.9 GHz (at PIN On) and 3.9-4.95 GHz (at PIN Off). To further show the expandability of this strategy, we also present another tunable MMA which in simulation performs a much wider bandwidth of 2.9-8.12 GHz. 


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