Electronically Tunable Liquid-Crystal-Based F-Band Phase Shifter

IEEE Access

Xuan Yu¹  Guangsheng Deng¹  Chao-Fan Wan¹  Hong-Bo Lu¹  Shuang-Yuan Sun¹  Zhiping Yin¹  Peng-Jun Wang¹  Jun Yang¹ 

[1] Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-electric Technology, Hefei University of Technology, Hefei, China;

关键词: Electrical control;    F-band;    liquid crystal;    phase shifter;   

DOI  :  10.1109/ACCESS.2020.3017165

来源: DOAJ

【 摘 要 】

We propose an F-band phase shifter based on the nematic liquid crystals (NLCs). The proposed phase shifter is formed by a voltage-controlled cavity through introducing an NLC layer between a dipole structure array and a metal floor. Under the action of electric field, the orientation of the NLC molecules will be deflected. We adjust the resonant frequency and phase of the reflected electromagnetic (EM) wave by tuning the permittivity. The transmission characteristics and the LC parameters are calculated and analyzed for EM waves within the frequency range from 85 to 115 GHz. The LC-based device with a $30\times 30$ array of two parallel unequal dipoles is printed on a quartz substrate, with 4 cm $\times {4}$ cm area and $490~\mu \text{m}$ thickness. The experimental results show that phase shift of zero to 350.7° is achieved at 104.2 GHz by changing the applied bias voltage on the LC layer from 0 to 20 V. Considering the anisotropy and inhomogeneity of the LC, an improved electrification model is established and compared with the test results. The proposed phase shifter is expected to find several applications in millimeter wave and terahertz reconfigurable antenna systems.

【 授权许可】

Unknown