Dielectric Properties of Liquid Crystal Polymer Substrates in the Region from 90 to 140 GHz

作者：Mao, Rongxin; Zhang, Guozhen; Xu, Lu; Gao, Haoyu; Yang, Jun^*; Yin, Zhiping; Deng, Guangsheng; Lu, Hongbo

来源：Crystals, 2022, 12(2): 170.

DOI：10.3390/cryst12020170

• nematic liquid crystal
• frequency selective surface
• electrical control
• dielectric constant

In this article, we present a study of the equivalent dielectric constant of two nematic liquid crystals (LCs) with different thicknesses, in the region from 90 to 140 GHz. The equivalent dielectric constant of the LCs was measured using a frequency selective surface (FSS). The LC-based tunable FSS with 22 x 25 unit cells was printed on a quartz substrate with an area of 4 x 4 cm(2) and a thickness of 480 mu m; the LC layer with thicknesses ranging from 30 to 100 mu m acted as a substrate. The FSS featured a maximum frequency-shifting range of 8.15 GHz and 30 mu m-thick LC layers with mutually orthogonal rubbing directions were deposited on it. The results show that the initial equivalent dielectric constant of the LC layer increased with the LC layer thickness, while the saturation-equivalent dielectric constant remained almost constant. This work provides LC parameters that can be useful for the design of LC-based devices in the millimeter and terahertz ranges.

• 单位
  桂林电子科技大学