Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials

Millimeter-Wave Broadband Tunable Band-Pass Filter Based on Liquid Crystal Materials
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基于液晶材料的毫米波宽带可调谐带通滤波器

DOI:
10.1109/access.2019.2954984
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发表时间:
2020
期刊:
影响因子:
3.9
通讯作者:
Wang Wen-Qin
Wang Wen-Qin
中科院分区:
计算机科学3区
文献类型:
--
作者:
Jiang Di;Li Xiaoyu;Fu Zihao;Wang Guofu;Zheng Zhi;Zhang Tianliang;Wang Wen-Qin

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本文提出了一种基于液晶的毫米波宽带带通可调谐滤波器,它通过引入四个传输零点来实现带通特性。主要的滤波结构是环形谐振器,加载两个四分之一波长的开路短截线,采用倒置微带结构。环形谐振器直接与液晶层接触,控制偏置电压,调整液晶材料的介电常数。实验结果表明,中心频率重构范围为27.7 GHz~24.6 GHz,相对带宽为48.17%~49.82%。滤波器重构前后通带内的群延时小于0.45 ns,表明了其在K带滤波器中的适用性。
In this paper, a wideband band-pass frequency tunable filter using liquid crystal is proposed for millimeter-wave applications, which achieves the band-pass characteristics by introducing four transmission zeros. The main filter structure is the ring resonator loaded with two quarter-wavelength open stubs using inverted microstrip structure. The ring resonator contacts directly with the liquid crystal layer to control the bias voltage to adjust the dielectric constant of the liquid crystal material. Experimental results show that the central frequency reconstruction range varies from 27.7GHz to 24.6GHz, and the corresponding relative bandwidth changes from 48.17% to 49.82%. The group delay within the pass-band is less than 0.45ns before and after the filter reconstruction, which indicates its applicability in K-band filter.
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