Meta-Structure Reflectarrays for 5G Wireless Coverage
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Solution Overview
Problem
The challenge in providing reliable and efficient millimeter wave wireless communications for 5G networks is exacerbated by high atmospheric attenuation, geographical obstructions, and environmental conditions, which limit the ability to maintain desired beam forms and avoid interference, particularly in dense-scattering areas and remote locations.
Innovation Solution
The deployment of meta-structure (MTS) based reflectarrays, which are arrays of cells with meta-structure reflector elements that reflect incident RF signals in specific directions, enhancing wireless coverage by acting as relays between base stations and user equipment, even in Non-Line-of-Sight (NLOS) areas, and are designed to operate at high frequencies and short distances with geometrical and link budget considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large array antennas are deployed to extend millimeter wave coverage, then wireless coverage area is improved, but the system becomes vulnerable to environmental conditions such as strong winds and storms
Solution Approach 1:
The patent divides the large array antenna system into multiple smaller reflectarray units distributed across the coverage area. Each unit independently provides localized coverage, eliminating the vulnerability of large structures to environmental conditions while maintaining extended coverage through coordinated operation of multiple segments.
Solution Approach 2:
The patent introduces passive reflectarray structures as intermediary elements that redirect millimeter wave signals from base stations to extend coverage without requiring large active antenna structures. These reflectarrays act as signal mediators that achieve coverage extension while being environmentally resilient.
2Reliability
If traditional antenna structures are used in dense-scattering areas, then direct signal transmission is attempted, but blind spots exist due to multipath, shadowing and geographical obstructions
Solution Approach 1:
The patent applies different reflectarray configurations and orientations at different locations within the coverage area to address local propagation conditions. Each reflectarray is optimized for its specific position and environmental context, enabling reliable signal transmission in dense-scattering areas by adapting to local multipath and shadowing characteristics.
Solution Approach 2:
The patent utilizes three-dimensional spatial distribution of multiple reflectarray units to overcome line-of-sight limitations in dense-scattering environments. By deploying reflectarrays at various heights, angles, and positions, the system creates multiple signal paths through space, eliminating blind spots caused by geographical obstructions and enabling coverage in previously unreachable 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
This solution significantly improves wireless coverage and performance by providing up to ten times the current 5G data rates, is cost-effective, easy to manufacture, and requires minimal manual adjustment, enabling reliable connectivity in various environments.
Implementation Method 1
arrays of cells with meta-structure reflector elements that reflect incident RF signals in specific directions
Data Source
AI summary
Examples disclosed herein relate to a meta-structure based reflectarray for beamforming wireless applications and a method of operation of passive reflectarrays in an indoor environment. The method includes receiving, by a plurality of passive reflectarrays, a Radio Frequency (RF) signal from a source. The method also includes reflecting, by the plurality of passive reflectarrays, the RF signal to generate a plurality of RF beams to a respective target coverage area, in which each of the plurality of RF beams increases a multipath gain along a signal path between a corresponding passive reflectarray to the respective target coverage area.