Liquid crystal based reflectarray for reconfigurable intelligent surface applications

Abstract

In this Letter, a reconfigurable reflectarray (RA) based on liquid crystal (LC) electric controlling property at Ka band is presented. The innovation focuses on measuring the phase steering ability of the whole LC RA with a structure of 4-finger under plane wave incidence and application on the actual scene, which can steer scattering wave to blind spots, not just play a role of EM launcher, but also an relay. Results show the LC RA can steer phase continuously to 213º with bias voltages and beam steering to different directions and different areas are achieved. This work introduces a LC RA as RIS that can steer scattered beam to increase receiving power at spot, which can be an application of RIS on wireless communication.

Impact of laser polarization and angle of incidence on phase shifting efficacy of an all-optically addressed liquid crystal delay line at X band

“…The insertion loss dependency on polarizations and incident angles will be investigated and reported in our later papers, based on which we can conclude the overall performance comparison with other stimuli, e.g., applying a magnetic field [8], temperature field [9], as well as the mainstream electrical field biasing [10] [11]. Upscaling techniques from microwave to millimeterwave [12] and terahertz [13] will also be undertaken in future endeavors as inspired by the upcoming 6G [14] and intelligent reflective surfaces [15] that advance at a rapid pace. Meanwhile, future research can examine the behavior of the laser-induced functional threshold (LIFT) and laser-induced damage threshold (LIDT) at sub-LIDT fluences under multi-pulse irradiation settings [16].…”

Electronically Reconfigurable 100-GHz Band Reflectarray for Wireless Communication Based on Microfiber/Liquid Crystal Composite

“…To manipulate the direction of the reflected wave, RAs are often designed with patterns of continuously varying sizes [2] or employ tunable elements such as ferroelectric [3], micro-electromechanical systems (MEMS) [4], and liquid crystal (LC) [5,6,7,8,9,10]. RAs using ferroelectrics and MEMS exhibit exceptionally rapid response times, typically on the order of μs.…”