Liquid Crystal RIS Phase Control for Obstacle-Blocked Wireless Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in maintaining high reliability and information transmission rates due to signal attenuation by obstacles, with traditional methods like installing additional base stations being inefficient due to high costs and limited space.
Innovation Solution
A reconfigurable intelligent surface with a simple structure, comprising unit cells with electrodes and a liquid crystal layer, capable of steering electromagnetic waves in various directions through phase control, allowing for efficient beam steering without the need for additional infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional base stations and repeaters are installed to improve signal strength, then wireless communication reliability is improved, but installation cost and complexity increase
Solution Approach 1:
The system segments the base station functionality into two parts: the main base station and multiple portable repeaters. Each repeater is a simplified unit that only needs to receive and retransmit signals, reducing the complexity of each individual device while collectively improving coverage and reliability
Solution Approach 2:
Portable repeaters act as intermediaries between the base station and user terminals in areas with poor signal coverage. These repeaters receive weak signals from the base station, amplify them, and retransmit them to users, thereby improving communication reliability without requiring complex infrastructure changes
2Reliability
If additional base stations are installed to improve signal coverage, then wireless communication performance is improved, but installation space requirements increase
Solution Approach 1:
The coverage enhancement function is segmented from the main base station and distributed to multiple portable repeaters. These repeaters can be placed in various locations including indoor spaces and mobile platforms, significantly reducing the requirement for additional large-scale stationary installation spaces while improving signal coverage
Solution Approach 2:
The system transitions from a two-dimensional planar deployment of base stations to a three-dimensional deployment including portable and mobile repeaters. This allows signal coverage enhancement in vertical and mobile dimensions, reducing the need for extensive horizontal expansion of stationary infrastructure
3Reliability
If traditional base station methods are used to improve signal strength, then communication reliability is improved, but cost increases
Solution Approach 1:
The system replaces expensive, permanent base station infrastructure with cheaper, portable repeaters that can be easily deployed and relocated. These repeaters use lower-cost components and can be installed in existing structures or moved as needed, significantly reducing installation and infrastructure costs while maintaining signal strength improvement
Solution Approach 2:
The system changes the operational parameters of signal enhancement from high-power, fixed-location base stations to lower-power, distributed portable repeaters. By using multiple low-power units instead of one or two high-power units, the system achieves similar or better coverage with reduced total cost and energy consumption
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 solution enables effective beam steering in multiple directions, enhancing wireless communication performance by reducing reflection loss and improving wave steering characteristics, particularly in millimeter wave bands, thus addressing the limitations of traditional methods.
Implementation Method 1
A reconfigurable intelligent surface is a meta surface including elements controllable by software, and may adjust the phase of a reflected radio wave and form a desired beam through phase control of the reflected wave
Implementation Method 2
each of the plurality of unit cells including a first electrode, a liquid crystal layer, and a second electrode
Data Source
AI summary
A reconfigurable intelligent surface is provided. The reconfigurable intelligent surface includes a plurality of unit cells arranged in a first direction and a second direction perpendicular to the first direction, each of the plurality of unit cells including a first electrode, a liquid crystal layer, and a second electrode, a plurality of first conductive lines electrically connecting to each other first electrodes arranged in the first direction from among the first electrodes included in the plurality of unit cells, and a plurality of second conductive lines electrically connecting to each other second electrodes arranged in the second direction from among the second electrodes included in the plurality of unit cells, wherein a wave incident on the reconfigurable intelligent surface is steered in a certain direction based on an electrical signal applied to the plurality of unit cells.