RIS Multi-Beam Steering for Simultaneous Wireless Power Transfer
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Solution Overview
Problem
Existing wireless power transmission systems using reconfigurable intelligent reflecting surfaces (RIS) face challenges in simultaneously charging multiple devices efficiently and ensuring long-distance field assumptions, particularly in adapting electromagnetic beams for mobile devices.
Innovation Solution
A method and system utilizing reconfigurable intelligent reflecting surfaces (RIS) to determine and control the reflection coefficient of each unit cell or tile, enabling adaptive multi-beam steering to focus electromagnetic waves on multiple receivers, supporting far-field communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single beam is used for wireless power transmission, then the system complexity is low, but only one device can be charged at a time reducing productivity
Solution Approach 1:
The patent segments the wireless power transmission into multiple independent beams, each targeting a different device. The RIS surface is divided into multiple unit cells that can be independently controlled to form separate beam paths, allowing simultaneous charging of multiple devices while maintaining manageable system complexity through modular beam management
Solution Approach 2:
The patent transitions from single-beam transmission to multi-beam transmission by utilizing the spatial dimension of the RIS surface. Each unit cell on the RIS can be configured to reflect signals in different directions, creating multiple beams in different spatial dimensions simultaneously, thereby enabling parallel power transmission to multiple devices
2Length of stationary object
If electromagnetic waves are transmitted over long distances, then the coverage area is expanded, but the field assumption for far-field communication cannot be guaranteed
Solution Approach 1:
The patent introduces the RIS surface as an intermediary between the transmitter and receivers. The RIS actively reflects and focuses electromagnetic waves, creating a controlled transmission path that extends the effective communication distance while maintaining the far-field assumption by using the RIS as a virtual antenna that establishes reliable signal propagation over extended ranges
3Productivity
If power is reflected uniformly in the RIS, then the distribution is simple, but multiple devices cannot be charged simultaneously with adaptive power distribution
Solution Approach 1:
The patent applies local quality by enabling each unit cell on the RIS to independently control the reflection characteristics for different spatial directions. This allows the system to create non-uniform power distribution patterns where different regions of the RIS surface direct power to different devices with different power levels, enabling simultaneous adaptive charging of multiple devices with customized power allocation
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
Enables simultaneous charging of multiple devices based on reception power by efficiently distributing energy using adaptive multi-beam steering with RIS, ensuring effective power distribution and long-distance communication.
Implementation Method 1
A reconfigurable intelligence surface (RIS) is implemented in numerous unit cells, and each unit cell of these RIS can change the characteristics of the phase, power, and polarization of electromagnetic waves that pass or reflect through this
Implementation Method 2
the power can be concentrated on the receiver by adjusting the phase of each antenna using an antenna array consisting of a plurality of antenna in the transmitter
Data Source
AI summary
Provided is a method for transmitting power in wireless communication using reconfigurable intelligent reflecting surfaces (RIS) of an electronic device, which includes: determining a value of a reflection coefficient of each unit cell or tile by scanning each tile of a reconfigurable intelligent reflecting surface (RIS) by a signal radiated through a transmitter; sending a beam to the reconfigurable intelligent reflecting surface (RIS) by controlling the transmitter; and multi-focusing an electromagnetic wave signal incident on the reconfigurable intelligent reflecting surface (RIS) on a plurality of receivers by setting an on/off state in each unit cell of the reconfigurable intelligent reflecting surface (RIS) based on the determined control parameter value, in which the tile is a partial array of the RIS having the same size, and supports far-field communication for the plurality of receivers.