基于聚合物分散液晶的频率可重构贴片天线  

Patch antenna adjustable in frequency based on polymer dispersed liquid crystal

作　　者：储怡冰 项颖[1] 张文慧[1] 郝禄国[1] 江博韬 陈凯 高延子 胡湧川 Michal KOHOUT CHU Yibing;XIANG Ying;ZHANG Wenhui;HAO Luguo;JIANG Botao;CHEN Kai;GAO Yanzi;HU Yongchuan;Michal KOHOUT(School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China;Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Department of Organic Chemistry,University of Chemistry and Technology Prague,CZ-16628 Prague,Czech Republic)

机构地区：[1]广东工业大学信息工程学院,广东广州510006 [2]北京科技大学新材料技术研究院,北京100083 [3]Department of Organic Chemistry,University of Chemistry and Technology Prague,CZ-16628 Prague,Czech Republic

出　　处：《液晶与显示》2024年第1期17-24,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.52303220);广东省自然科学基金(No.2022A1515010777);广东省科技计划(No.2022A0505050072)。

摘　　要：本文设计了一种以液晶聚合物为介质基板的频率可重构天线,通过调节贴片的位置及尺寸实现天线的阻抗匹配。制备聚合物分散液晶薄膜作为天线的介质,并根据液晶与聚合物的比例分别为7∶3、6∶4、5∶5这3种不同配比以及50μm和100μm两种不同膜的厚度来考察其效果。在电场作用下,液晶微滴会沿着电场方向重新取向排列,通过改变驱动电压的大小,实现天线的频率可重构。经过对比分析得出,液晶含量(质量分数)为70%的聚合物分散液晶薄膜具有最佳的效果,在48 V的驱动电压下实现了62 MHz的频率连续调节,天线的最大增益为3.5 dBi。该基于液晶聚合物的频率可重构贴片天线结构简单、体积小、质量轻,易于集成在各种移动设备中,发展前景广阔。A frequency reconfigurable antenna with a liquid crystal polymer as the dielectric substrate is designed to realize the impedance matching of the antenna by adjusting the position and size of the patch.A polymer-dispersed liquid crystal film is prepared as the medium of the antenna,and its effect is examined on the basis of various liquid crystal to polymer ratios and film thicknesses.Under the action of an electric field,the formed liquid crystal microdroplets are reoriented and arranged along the direction of the electric field.The frequency reconfigurable antenna is then realized by changing the magnitude of driving voltage.After comparative analysis,it is concluded that the polymer-dispersed liquid crystal film with a liquid crystal content 70%(mass fraction)has the best effect,achieving continuous frequency adjustment of 62 MHz under a driving voltage of 48 V,and the maximum gain of the antenna is 3.5 dBi.This frequency reconfigurable patch antenna based on liquid crystal polymer is simple in structure,small in size,light in weight,and is easy to be integrated into a variety of mobile devices,which has a promising future for development.

关 键 词：液晶聚合物 频率可重构 贴片天线 

分 类 号：O753.2[理学—晶体学]