Dual-Polarized Reflectarray Layout for 5G Blind Zone Coverage
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Solution Overview
Problem
Millimeter-wave 5G communications face challenges with signal propagation due to larger path loss and sensitivity to physical barriers, resulting in blind zones, which hinder widespread adoption of 5G communications protocols in wireless networks.
Innovation Solution
A passive shaped-beam reflectarray designed for dual-linear polarization, capable of producing a broadened and deflected beam, is deployed in antenna systems to enhance coverage in millimeter-wave spectrum, particularly at frequencies like 28 GHz, 39 GHz, and 60 GHz, with a robust performance under large angles of incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If millimeter-wave frequencies (28 GHz, 39 GHz, 60 GHz) are used for 5G communications, then high-speed wireless access is provided, but signal propagation suffers from larger path loss and higher sensitivity to physical barriers
Solution Approach 1:
A passive reflectarray antenna is introduced as an intermediary device between the base station and the end device. This reflectarray receives millimeter-wave signals from the base station, reflects and redirects them toward the end device, thereby providing signal coverage in blind zones and non-line-of-sight areas without requiring active electronic components
Solution Approach 2:
The reflectarray antenna utilizes variable path lengths for different reflecting elements to introduce specific phase shifts. By adjusting the physical path length parameters of the reflecting elements, the antenna achieves beamforming capability, directing signals toward specific spatial locations to overcome path loss and improve signal reliability
2Area of stationary object
If base station antenna coverage is provided, then wireless access is enabled, but coverage is disrupted by buildings, walls, or other structures creating blind zones
Solution Approach 1:
The reflectarray serves as a passive intermediary that captures signals from the base station and redirects them around or over physical barriers. By positioning the reflectarray strategically, it creates alternative signal paths that bypass buildings, walls, and other obstructing structures, extending coverage into previously unreachable blind zones
Solution Approach 2:
The reflectarray introduces a new spatial dimension for signal propagation by utilizing reflected paths that differ from the direct line-of-sight path. This creates additional coverage areas in three-dimensional space, allowing signals to reach areas blocked in the original propagation plane
3Area of stationary object
If a passive reflectarray is used to improve coverage, then beam broadening and deflection are achieved, but the system must maintain robust performance under large angles of incidence
Solution Approach 1:
Each reflecting element in the reflectarray is designed with specific local characteristics, including varied path lengths and orientations. This local customization allows each element to handle specific incident angles independently, collectively providing robust performance across a wide range of large angles of incidence while maintaining beamforming capability
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 reflectarray significantly improves coverage by broadening and deflecting beams, effectively addressing blind zones and achieving polarization diversity, ensuring stable performance within the 5G frequency band, thereby enhancing wireless access in challenging scenarios.
Implementation Method 1
The RA can be deployed in an antenna system for wireless communications... capable of producing a broadened and deflected beam... The RA is able to generate a broadened and deflected beam in dual-linear polarization
Data Source
AI summary
A reflectarray for an antenna system for use in wireless communications is described. The reflectarray includes a substrate and a plurality of cells configured in an array on the substrate. Each cell in the plurality of cells includes three dipoles arranged in a parallel configuration with a length of a center dipole is longer than a length of a lateral dipole. The length of the lateral dipole is 65% of the length of the center dipole. The plurality of cells can include a first set of three parallel dipoles arranged in a first direction and a second set of three parallel dipoles in a second direction that is orthogonal to the first direction. The first set of three parallel dipoles and the second set of three parallel dipoles are shifted half a period along both the first direction and the second direction in the array.