Pneumatic Tire Sidewall Antenna Layout for Stable Communication
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Solution Overview
Problem
The communication performance of a flat antenna in a pneumatic tire varies depending on its positional orientation.
Innovation Solution
The flat antenna is disposed in the tire body so that its antenna in-plane direction is perpendicular to the thickness direction, with the antenna facing the outer surface of the tire body, and the communication device is embedded in the sidewall portion along the tire radial direction, ensuring the antenna tip does not face the turn-up end of the carcass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flat antenna is embedded in the tire body without specific orientation constraints, then the device complexity is reduced, but the communication performance varies depending on positional orientation
Solution Approach 1:
The patent applies preliminary action by pre-defining the orientation of the flat antenna during the embedding process. The antenna is positioned with its plane parallel to the tire's radial cross-section before the tire undergoes usage, ensuring optimal communication performance is established in advance rather than requiring adjustment during operation.
Solution Approach 2:
The patent applies asymmetry by specifying a particular orientation for the flat antenna that is not symmetric with respect to all possible positions. The antenna plane is oriented parallel to the radial cross-section, creating an asymmetric configuration that optimizes electromagnetic coupling with external readers while maintaining simplicity in the embedding process.
2Reliability
If the flat antenna is positioned without considering stress factors, then the ease of manufacture is improved, but the durability of the communication device deteriorates
Solution Approach 1:
The patent applies local quality by identifying specific regions within the tire body that are subject to different stress conditions. The flat antenna is positioned in a location and orientation that avoids high-stress areas such as the turn-up end of the carcass, where radial stresses concentrate during tire deformation. This localized positioning ensures the antenna remains in a low-stress environment while simplifying the manufacturing process.
3Reliability
If the antenna tip is positioned facing the turn-up end of the carcass, then the area coverage is maximized, but the stress on the antenna increases reducing durability
Solution Approach 1:
The patent applies parameter changes by modifying the orientation parameter of the flat antenna. Instead of allowing the antenna to extend in any direction to maximize coverage area, the antenna plane is oriented parallel to the radial cross-section, which changes the spatial parameters of antenna placement to avoid high-stress regions while maintaining effective communication coverage.
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 improves communication performance and durability of the communication device by maintaining consistent electromagnetic coupling and reducing stress on the antenna, enhancing overall tire durability.
Implementation Method 1
communication performance of the flat antenna may vary depending on the positional orientation of the communication device
Data Source
AI summary
A pneumatic tire including: a tire body; and a communication device embedded in the tire body or attached to an inner surface of the tire body. The communication device includes a flat antenna, and the communication device is disposed so that an antenna in-plane direction that is perpendicular to the thickness direction of the flat antenna is along an outer surface of the tire body.