High-Mast MIMO Antenna Layout for Low-Interference Vehicle Wi-Fi
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Solution Overview
Problem
Existing wireless systems struggle to provide continuous, reliable wireless services for ground-based moving clients and high throughput requirements when installed on high mast vertical assets, due to RF interference and reduced RF gain in certain areas.
Innovation Solution
A directional dual-polarity MIMO antenna is oriented directly down towards the earth for high mast mounting, supporting communications with mobile vehicles, and a communications system is designed to operate on high mast lighting systems, providing mesh radio connectivity and power management for continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If omnidirectional antennas are used on high masts, then wide coverage area is achieved, but RF interference from adjacent masts and terrestrial networks increases
Solution Approach 1:
The patent applies directional antennas with specific down-tilt angles (5-15 degrees) to create localized coverage zones rather than omnidirectional coverage. This concentrates RF energy in specific geographic areas, reducing interference to and from adjacent masts while maintaining adequate coverage for the target service area.
Solution Approach 2:
Instead of using omnidirectional antennas that radiate horizontally, the patent inverts the approach by using directional antennas with down-tilt that radiate downward at angles. This reverses the traditional radiation pattern to better suit high-mast installations and reduce horizontal interference.
2Area of stationary object
If antenna gain is increased to solve coverage problems, then coverage area is improved, but RF interference issues worsen
Solution Approach 1:
The patent uses directional antennas with down-tilt to concentrate RF energy in specific downward directions rather than radiating omnidirectionally. This provides adequate coverage area through focused beams while reducing overall interference levels by not radiating equally in all horizontal directions.
3Object-affected harmful factors
If directional antennas with down-tilt are used, then RF interference is reduced, but coverage of large areas requires many antennas increasing device complexity
Solution Approach 1:
The patent employs dual-polarized antennas that can transmit and receive on both vertical and horizontal polarizations simultaneously. This multi-functionality allows a single antenna to handle multiple spatial streams and provide more comprehensive coverage, reducing the total number of antennas needed while maintaining low interference characteristics.
Solution Approach 2:
The patent combines multiple antenna functions into dual-polarized antenna elements that can simultaneously transmit and receive on different polarizations. This merging of functions reduces the overall number of discrete antenna components needed while achieving the desired coverage and interference reduction goals.
4Area of stationary object
If access points are mounted on high masts, then line of sight coverage is improved, but mobile clients experience low gain due to antenna radiation patterns
Solution Approach 1:
The patent inverts the traditional horizontal radiation pattern by using directional antennas with down-tilt that radiate downward at 5-15 degree angles. This reversal of the radiation pattern direction aligns the main lobe with mobile clients on the ground, improving signal strength and connection reliability for moving vehicles while maintaining line-of-sight advantages of high-mast mounting.
Solution Approach 2:
The patent creates localized high-gain coverage zones directed at ground-level mobile clients using down-tilted directional antennas. This concentrates RF energy where it is needed most (at mobile client locations) rather than distributing it uniformly in all directions, improving reliability for mobile connections.
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 solution achieves reliable line-of-sight coverage for mobile stations beneath high masts, reduces interference from nearby networks, and allows dynamic handoff of connections as mobile stations move, ensuring continuous and efficient wireless communication.
Implementation Method 1
A directional dual-polarity MIMO antenna is oriented directly down towards the earth for high mast mounting, supporting communications with mobile vehicles
Implementation Method 2
providing mesh radio connectivity and power management for continuous operation
Data Source
AI summary
A communications apparatus to be installed on high mast lighting systems or other vertical assets with significant above ground projections. The apparatus is designed to mount to existing light ring spokes or other existing mounting structures. The system is powered during nighttime hours by grid power and during daylight hours by internal battery storage. A uniquely-oriented directional dual polarity MIMO antenna adapted for high mast mounting supports communications with mobile vehicles using MIMO emissions in a North/South and East/West polarization. Mobile vehicle clients may then use dual polarized antennas including skyward-looking radiation patterns with major lobes that are oriented directly up towards the sky.