Tire Antenna Orientation Reduces Radio Wave Attenuation
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Solution Overview
Problem
The attenuation of radio waves emitted by tire information acquisition devices is significant due to the presence of metal components like steel carcasses in larger tires, which hinders effective wireless communication of tire pressure data.
Innovation Solution
The information acquisition device is positioned within the tire with a coil-shaped antenna oriented at an angle between 0° to 40° relative to the tire's axis of rotation, allowing the emitted electric field to be maximally orthogonal to the steel carcass, thereby reducing wave blocking and attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the information acquisition device is provided to the interior space of a larger tire, then the tire can effectively monitor air pressure in larger tires, but the radio waves are blocked by the steel carcass embedded in the tire, causing dramatic attenuation of transmitted radio waves
Solution Approach 1:
The patent changes the orientation parameter of the antenna by positioning it at a specific angle (0° to 40°) relative to the tire's rotational axis. This parameter change allows the antenna's electric field to be orthogonal to the steel carcass, reducing radio wave blocking and attenuation while maintaining reliable tire pressure monitoring in larger tires.
2Strength
If a steel carcass is embedded in the tire to increase tire strength, then the tire structural strength is improved, but the steel carcass blocks radio waves and causes dramatic attenuation of transmitted signals
Solution Approach 1:
The patent applies local quality by creating a specific spatial relationship between the antenna and the steel carcass. The antenna is positioned at a specific angle (0° to 40°) relative to the tire's rotational axis, creating a localized orientation where the electric field is orthogonal to the steel carcass. This local orientation optimization reduces radio wave blocking at the antenna-carcass interface while maintaining the overall structural integrity provided by the steel carcass.
3Loss of energy
If the antenna is positioned at an angle of 0° to 40° relative to the tire axis, then radio wave emission efficiency is improved and attenuation is reduced, but the installation precision requirement increases
Solution Approach 1:
The patent applies partial action by defining an angular range (0° to 40°) rather than requiring a single precise angle. This range provides a tolerance zone that maintains effective radio wave emission while accommodating manufacturing and installation variations. The upper limit of 40° ensures the electric field remains sufficiently orthogonal to the steel carcass to minimize blocking, while the lower limit of 0° allows flexibility in installation.
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 enhances the emission efficiency of radio waves outside the tire, reducing attenuation and extending the transmission distance of tire pressure data.
Implementation Method 1
a coil-shaped antenna connected to a transmission circuit and configured to emit a signal including the physical information as a radio wave of a predetermined frequency
Implementation Method 2
disposing the antenna such that the direction of emitted electric field from the antenna is maximally orthogonal to the direction of the steel carcass extending in the tire radial direction lowers the blocking of the radio waves
Data Source
AI summary
An information acquisition device is provided within a virtual plane including a coil axis of a coil-shaped antenna and having a perpendicular line orthogonal to an axis of rotation of a tire, such that the angle formed by the coil axis of the antenna relative to the tire rotational axis is within a range of 0° to 40°. The amount of attenuation of radio waves emitted from the antenna to the exterior of the tire is thereby reduced.