Phased Array Antennas (PAAs) and Reconfigurable Intelligent Surfaces (RISs) have garnered substantial attention for their capacity to astutely manipulate the wireless propagation environment, establishing them as a pivotal technology for enhancing capacity and coverage in 6G communication networks. High-performance phase control unit is the key element for PAA/RIS. This talk presents the design and measurement results of a reflective liquid-crystal (LC) phase shifter in microwave range.
The response time of the vertically aligned in-plane-switching (VA-IPS) mode with respect to different driving voltages is studied. It is found that the rising time, Ton, is highly related to the square of the electric field between the inter-digit electrodes. Since the dielectric torque exerted on the liquid crystal molecules is proportional to the square of the electric field, one can say that it basically dominates the Ton of the VA-IPS mode. However, there’s evidence showing that the total torque perceived by the LC molecules is not simply caused by the voltage applied to the inter-digit electrodes, but also by the flexoelectricity originating from the splay deformation between the electrodes. This leads to the phenomenon that Ton doesn’t monotonically decrease with the increasing dielectric torque.
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