Multi-Polarized Antenna Array for Accurate RF Angle-of-Arrival
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Solution Overview
Problem
Current RF transceivers face challenges in accurately determining the location of RF transmitters using angle of arrival methods, as existing antenna arrays are limited in their ability to effectively detect and differentiate between multiple polarizations of RF signals, leading to inefficiencies in localization techniques for indoor positioning systems and location-based services.
Innovation Solution
A multi-polarized antenna array is designed with multiple metal patches, each having four feed-points, a multiplexer to switchably couple these feed-points to a controller, allowing the array to preferentially detect signals of different polarizations, thereby enhancing the determination of location information by processing RF signals from each feed-point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional antenna array is used for angle of arrival determination, then the device structure is simple, but the ability to detect and differentiate multiple polarizations of RF signals is limited
Solution Approach 1:
Each metal patch is divided into four separate feed-points, allowing the antenna to detect signals with different polarizations independently. This segmentation enables the system to handle multiple polarization states simultaneously, improving adaptability without requiring multiple separate antenna elements.
Solution Approach 2:
The antenna array is designed to perform multiple functions: it can detect RF signals with various polarizations (horizontal, vertical, circular, elliptical) using the same physical structure. The four feed-points on each metal patch enable the antenna to function as four different polarization-sensitive elements, achieving multi-functionality within a single antenna structure.
2Measurement precision
If multiple separate antennas are used to detect different polarizations, then the polarization detection capability is improved, but the device complexity and size increase
Solution Approach 1:
Multiple polarization-detection functions are merged into a single metal patch structure with four feed-points. Instead of using four separate antenna elements, the invention combines them into one integrated patch, thereby maintaining high polarization detection accuracy while significantly reducing the required space and simplifying the overall array structure.
Solution Approach 2:
The invention transitions from using multiple separate antenna elements in space to using multiple feed-points on a two-dimensional metal patch. This dimensional transformation allows the system to achieve the same polarization detection capability with a more compact footprint, effectively moving the complexity from spatial arrangement to planar structure design.
3Measurement precision
If a single feed-point per metal patch is used, then the device complexity is reduced, but the localization precision and angle of arrival determination are insufficient
Solution Approach 1:
The single feed-point is segmented into four distinct feed-points on each metal patch, each capable of receiving signals with different polarization states. This segmentation provides the system with multiple measurement dimensions (different polarizations) that can be processed to improve localization precision and angle of arrival determination without requiring multiple separate antenna elements.
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 configuration enables more accurate and efficient localization by allowing the antenna array to detect and process signals of various polarizations, improving the determination of angle of arrival and received signal strength indication, thus enhancing the precision of location-based services.
Implementation Method 1
when the first feed-point of each metal patch is selected, the antenna array is configured to preferentially detect a signal having a first polarization; when the second feed-point is selected the antenna array is configured to preferentially detect a signal having a second polarization
Data Source
Figure 1~2
Figure 3A~3C
Figure 3D~3E
AI summary
An apparatus and method for determining location information using a multi-polarized antenna array is disclosed. The multi-polarized antenna array includes a plurality of metal patches and a multiplexer. Each metal patch has at least two feed-points. The multiplexer is coupled to an RF terminal and to each of the at least two feed-points of each of the plurality of metal patches. The antenna array is configurable to couple each feed-point one at a time to the RF terminal. Location information may be determined by a controller coupled to the RF terminal from RF signals received via each feed-point.