Tunable and reconfigurable bandstop filters enabled by optically controlled switching elements
Tunable and reconfigurable bandstop filters enabled by optically controlled switching elements
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由光控开关元件实现的可调谐和可重构带阻滤波器
DOI：
10.1049/ell2.12654
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发表时间：
2022
影响因子：
1.1
通讯作者：
Liu, Lei
中科院分区：
文献类型：
--
作者：
Li, Peizhao;Shi, Yu;Deng, Yijing;Fay, Patrick;Liu, Lei
报道了一种利用无偏压光控光导射频开关元件设计可调可重构带阻滤波器的新方法。为了验证该方法的有效性，利用开环耦合微带传输线在RO3010衬底上设计了一个具有4.05和4.75 GHz两个阻带的带阻滤波器。为了实现可重构性，在每个谐振器的缝隙中嵌入了厚度为∼73μm的微加工硅片。滤光片的调谐和重新配置是通过使用波长为808 nm的光纤耦合激光二极管选择性地照射硅片来完成的。通过打开和关闭每个激光二极管，可以动态重新配置滤光片阻挡带。此外，通过将光强从0改变到20W/cm2，可以连续独立地调节每个阻带的抑制。利用几何尺度，这种方法有望实现从微波到毫米波-太赫兹的一类新型紧凑和高性能的可调和/或可重构电路。
The authors report a novel approach for designing tunable and reconfigurable bandstop filters by employing bias‐free optically‐controlled photoconductive radio frequency (RF) switching elements. To verify the effectiveness of the approach, a bandstop filter with two stopbands centred at 4.05 and 4.75 GHz was designed using a split‐ring‐coupled microstrip transmission line on RO3010 substrates. To enable reconfigurability, a micromachined Si chip with a thickness of ∼73 μm was embedded in the gap of each resonator. The tuning and reconfiguring of the filter are accomplished by selectively illuminating the Si chips using fibre‐coupled laser diodes with a wavelength of 808 nm. By turning on and off each laser diode, the filter stop bands can be dynamically reconfigured. In addition, the suppression of each stop band can be continuously and independently tuned by changing the light intensity from 0 to 20 W/cm2. With geometric scaling, this approach is promising for realizing a novel class of compact and high‐performance tunable and/or reconfigurable circuits from the microwave to mmW‐THz region.