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为解决传统移相器设计中存在电路结构复杂、直流功耗大、插损随频率的增高而变大等缺陷，利用液晶材料的双折射原理，提出了一种基于向列相液晶材料的微波波段小型移相器设计方案。利用液晶各向异性的特性，液晶分子的轴向通过薄膜定向层进行初始化锚定，分子的长轴取向通过改变外置偏压形成的电场进行调节，从而改变液晶作为器件衬底材料的介电常数。本文设计并制作了移相器样品，通过改变外加偏压值，成功地控制了液晶分子团簇的局部轴向取向，完成射频调制功能。设计样品中采用的液晶材料的介电各向异性为0.45。器件可工作于三个频段，在高频段中移相范围最大，当工作频率为20 GHz时移相范围可达到33°。测量结果验证了设计和制作工艺的有效性。采用相同的制备工艺，可进一步优化设计以扩大差分相移的范围和设计制作基于向列型液晶的毫米波可调器件。
Abstract：In order to address the limitations of traditional phase shifter designs， such as sophisticated circuit structures， high direct current power consumption， especially at high frequency band， the birefringence principle of liquid crystal materials was utilized and a miniaturized phase shifter design based on Nematic Liquid Crystal (NLC) material was proposed for operation at microwave frequency band. With the property of anisotropy， the axial orientation of liquid crystal molecules is initialized by using a thin film directional layer， and the long axial orientation of molecules is further modulated by applying bias voltages， hence tuning the permittivity of the material working as substrate. The local axial orientation of liquid crystal molecular clusters was successfully manipulated by varying external bias. We propose a novel transmission-line-based design framework employing liquid crystal materials exhibiting a dielectric anisotropy of Δε = 0.45. Three operational frequency band was observed with a maximum differential phase shift at the high frequency. When the operating frequency is 20 GHz， the phase shift range of the prototype reaches 33°. Results from measurement revealed the performance of the proposed design. Further optimization can be performed to expand range of the differential phase shift using the same manufacturing techniques.
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基本信息:
中图分类号:TN623
引用信息:
[1]吕先洋,段金圆,谢慧琳,等.基于向列型液晶的小型化微波移相器设计[J].南通大学学报(自然科学版)().
基金信息:
国家级大学生创新创业训练计划项目（202410304057Z）
2025-05-15
2025-05-15
2025-05-15