Liquid Crystal RIS Beam Steering Around Wireless Obstacles
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Solution Overview
Problem
In wireless communication environments, obstacles like walls can significantly lower signal strength from base stations, reducing the reliability and data transmission rate of cellular networks, and the installation of additional base stations or repeaters is inefficient due to high costs and limited space.
Innovation Solution
A reconfigurable intelligent surface with a simple structure, comprising unit cells with first and second electrodes, a liquid crystal layer, and conductive lines, capable of steering electromagnetic waves by applying electrical signals, allowing for beam steering in various directions without the need for extensive 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 improving overall coverage and reliability through distributed deployment.
Solution Approach 2:
Portable repeaters act as intermediary devices between the base station and mobile devices in areas with poor coverage. These repeaters receive weak signals from the base station, amplify them, and retransmit them to mobile devices, thereby improving wireless communication reliability without requiring complex infrastructure changes.
2Reliability
If additional base stations and repeaters are installed to improve signal strength, then wireless communication reliability is improved, but installation cost increases
Solution Approach 1:
The patent employs portable repeaters that are designed to be cost-effective and easily deployable. These repeaters use simplified hardware architectures compared to full base stations, reducing manufacturing costs. The portable nature allows for flexible deployment without expensive civil engineering work, making the solution economically viable for improving wireless coverage.
3Reliability
If base stations are installed in areas with limited space, then signal coverage is improved, but installation flexibility is reduced
Solution Approach 1:
The portable repeaters are designed with dynamic deployment capabilities, allowing them to be easily moved and repositioned based on coverage requirements. Unlike fixed base stations that require permanent installation, these repeaters can be adapted to different locations and environments, providing installation flexibility while maintaining signal coverage in space-constrained areas.
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 reconfigurable intelligent surface effectively enhances wireless communication performance by steering waves around obstacles, improving signal strength and data transmission rates with flexibility and cost-effectiveness, particularly in areas with limited installation space.
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
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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.