Road Magnetic Marker With RFID Antenna for Buried Communication
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Solution Overview
Problem
Conventional magnetic markers in roads provide limited information and reliability for vehicle navigation and control systems.
Innovation Solution
Incorporating a wireless tag with a circuit and a conductive layer on the outer peripheral surface of a magnetic marker, which functions as an external antenna, and setting different frequency specifications for buried and surface-laid markers to account for wave shifts due to varying permittivity materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a wireless tag is added to the magnetic marker to provide more information, then the quantity of information increases, but the device complexity increases
Solution Approach 1:
The patent combines the magnetic marker function with a wireless tag (RFID) into a single integrated structure. The wireless tag is embedded within or attached to the magnetic marker body, allowing both magnetic detection and wireless communication functions to coexist in one device. This merging approach increases information quantity while minimizing the increase in overall device complexity.
Solution Approach 2:
The magnetic marker is designed to serve multiple functions: it provides magnetic field detection for vehicle positioning and simultaneously functions as a wireless communication node for data exchange. The wireless tag enables the magnetic marker to provide additional information such as identification data, lane information, and communication capabilities, making the device universal and multi-functional.
2Reliability
If a conductive layer is added as an external antenna to improve wireless communication reliability, then the reliability of wireless communication improves, but the device complexity increases
Solution Approach 1:
The magnetic marker structure itself serves dual purposes: the main body provides magnetic field generation/detection functionality, and the outer peripheral surface serves as a conductive layer that functions as an external antenna for wireless communication. By making the structural components serve multiple functions, the patent improves wireless communication reliability without significantly increasing device complexity.
Solution Approach 2:
The conductive layer is integrated with the magnetic marker's outer peripheral surface, merging the structural boundary of the marker with the antenna function. This integration allows the same physical structure to serve both as the marker body boundary and as the radiating element for wireless communication, improving reliability while avoiding additional complex antenna structures.
3Reliability
If different frequency specifications are used for buried and surface-laid magnetic markers to account for wave shifts, then the reliability of transmission improves, but the device complexity increases
Solution Approach 1:
The patent applies different frequency specifications to magnetic markers based on their specific installation environment - buried markers use one frequency range while surface-laid markers use another. This local quality approach tailors the operational parameters to the specific conditions of each deployment scenario, compensating for the effects of burying materials on electromagnetic wave propagation and improving transmission reliability.
Solution Approach 2:
The system changes the frequency parameter of the wireless tag based on the installation method (buried vs. surface-laid). By adjusting this key operational parameter according to the environmental conditions, the patent compensates for the permittivity differences of surrounding materials, ensuring reliable communication in both deployment scenarios without requiring fundamentally different hardware designs.
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
Enhances information transmission reliability and communication distance for vehicle systems, maintaining effective communication even when buried in road materials.
Implementation Method 1
a conductive layer provided on at least part of an outer peripheral surface of a main body forming a magnetism generation source, the conductive layer being not electrically continuous with the main body
Implementation Method 2
If the burying material is present in the route of electric waves, a shift phenomenon, in which the frequency of passing electric waves is shifted can occur due to a difference between the permittivity of the burying material and the permittivity of air
Data Source
AI summary
In a columnar-shaped magnetic marker including a magnet formed by dispersing a magnetic powder of iron oxide in a polymer material and to be laid in a road without being accommodated in a metal container, one end face of an outer peripheral surface and an entire outer peripheral side surface of magnet are covered with metal foil forming a conductive layer, and an RFID tag which performs wireless communication with a tag reader mounted on a vehicle side is arranged on the end face of magnetic marker provided with metal foil as being in a state of being electrically insulated from metal foil.