For liquid crystal reconfigurable surfaces, the optimal phase-shifter length, which trades insertion loss against phase-shift range, depends on the user's position: specular users want a short shifter, off-axis users need a longer one.
Phase dependent loss analysis for RIS systems,
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Liquid Crystal-Based RIS Loss-Trade-Off Analysis
For liquid crystal reconfigurable surfaces, the optimal phase-shifter length, which trades insertion loss against phase-shift range, depends on the user's position: specular users want a short shifter, off-axis users need a longer one.