Liquid Crystal RIS Unit Cell Layout for Low-Power Beam Steering
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Solution Overview
Problem
Mobile communication systems face challenges with reduced reliability and information transmission rates due to signal obstruction by obstacles, and existing solutions like installing additional base stations and repeaters are inefficient due to high costs and power consumption.
Innovation Solution
A reconfigurable intelligent surface (RIS) device using liquid crystal technology, comprising a matrix of unit cells with reflective elements and electrode layers, allows for phase shifting and beam steering of electromagnetic signals to overcome obstructions and enhance communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional base stations and repeaters are installed to improve signal strength, then communication reliability is improved, but installation cost and power consumption increase
Solution Approach 1:
The patent introduces a reconfigurable intelligent surface as an intermediary component between the transmitter and receiver. This surface reflects and redirects electromagnetic signals around obstacles, enabling communication without requiring additional active base stations or repeaters that consume high power. The RIS passively manipulates signal propagation, significantly reducing energy consumption while maintaining communication reliability.
Solution Approach 2:
The patent utilizes liquid crystal materials that can change their electromagnetic properties (permittivity, permeability) in response to applied voltage. By dynamically adjusting these material parameters, the system can control signal reflection and phase without requiring high power consumption, as the liquid crystal state changes are achieved with minimal energy input compared to traditional active amplification methods.
2Reliability
If additional base stations and repeaters are installed to improve signal strength, then communication reliability is improved, but installation cost increases
Solution Approach 1:
The reconfigurable intelligent surface serves as a cost-effective intermediary solution compared to deploying multiple active base stations or repeaters. The RIS structure is passive and can be integrated into existing infrastructure (such as building facades or ceilings), eliminating the need for expensive active equipment installation while still achieving reliable signal transmission through intelligent reflection and beam steering.
Solution Approach 2:
The patent designs a universal unit cell structure that can be repeatedly tiled to create large-scale RIS surfaces. Each unit cell contains reflective elements and liquid crystal layers that work together to provide signal reflection and phase control. This modular, multi-functional design allows the same structure to serve multiple purposes (signal reflection, beam steering, phase control) across different deployment scenarios, reducing overall system cost.
3Measurement precision
If liquid crystal layers with electrode patterns are used to control signal phase, then beam steering precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the RIS surface into discrete unit cells, each containing its own reflective elements and liquid crystal layer with electrode patterns. This segmentation allows independent control of phase and amplitude at each unit cell, enabling precise beam steering through digital control. The modular nature of unit cells simplifies manufacturing and control compared to continuous analog systems, as each cell can be addressed independently through digital signals.
Solution Approach 2:
The patent implements local quality control by varying the electrode patterns and liquid crystal configurations within individual unit cells to achieve specific phase shifts and reflection characteristics for each location. This local customization of electromagnetic properties allows precise beamforming and steering, as each unit cell can be optimized for its specific position in the array, contributing to overall beam precision without requiring complex global control mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The RIS device improves wireless communication performance by enabling efficient signal redirection and phase control, enhancing reliability and data rates while being energy-efficient and cost-effective.
Implementation Method 1
a liquid crystal layer disposed on the first substrate
Implementation Method 2
a liquid crystal layer between the first substrate and the second substrate
Implementation Method 3
Each of the unit cells includes a reflective element
Data Source
AI summary
The present disclosure provides a communication device including a plurality of unit cells arranged in a matrix along a row direction and a column direction. Each of the unit cells includes a reflective element, a first substrate disposed on the reflective element; a liquid crystal layer disposed over the first substrate; a second substrate disposed over the liquid crystal layer; a first electrode layer between the first substrate and the liquid crystal layer; and a second electrode layer disposed between the second substrate and the liquid crystal layer. The second electrode layer includes a plurality of trenches overlapping a boundary of the first electrode layer from a top-view perspective.