Segmented Dipole Antenna for Tire RFID Resonance Tuning
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Solution Overview
Problem
Existing RFID antennas embedded in tires face challenges in precise resonance tuning due to limited tunability and space constraints, leading to potential material defects and functional issues.
Innovation Solution
The RFID antenna is designed with segmented radiators, allowing for fine adjustments of resonance frequency through variations in segment shape, width, and length, which includes linear and helical spring segments, and a matching network to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the antenna length is reduced to tune resonance frequency, then the resonance frequency can be adjusted, but the tunability is limited and frequency steps are large
Solution Approach 1:
The antenna is divided into multiple segments along its length, where each segment can be independently adjusted in terms of length, width, or shape. This segmentation enables fine-grained control over the antenna's resonant frequency, allowing for precise tuning without requiring large changes in overall antenna length. The cumulative effect of small adjustments across multiple segments provides continuous frequency coverage with fine resolution.
Solution Approach 2:
Different segments of the antenna are designed with varying local properties (different lengths, widths, or shapes) to optimize resonance characteristics at specific locations. This local variation allows the antenna to achieve precise resonance tuning by adjusting individual segment properties rather than uniformly changing the entire antenna structure.
2Measurement precision
If the antenna structure is made more complex to improve tuning precision, then resonance tuning precision improves, but the device complexity increases
Solution Approach 1:
The antenna structure is segmented into multiple adjustable sections, where each segment can be independently modified. This approach achieves precise resonance tuning through simple, modular adjustments to individual segments rather than requiring complex overall restructuring of the antenna.
Solution Approach 2:
The antenna incorporates adjustable segments that can be dynamically modified during or after the embedding process. This dynamic adjustability allows for precise resonance tuning without requiring a completely complex fixed structure, as the antenna can be adapted to match target frequencies through simple segment modifications.
3Reliability
If the transponder is embedded in the tire to ensure permanent connection, then the tire identification is permanent, but it creates material defects and air enclosures that may damage the tire
Solution Approach 1:
The transponder and its antenna are designed as segmented, flexible structures that can be embedded in the tire without creating large continuous defects. The segmented design allows the tire material to better accommodate the embedded components, reducing the formation of air enclosures and stress concentration points that could lead to tire damage.
Solution Approach 2:
The antenna structure is designed with flexible, thin conductive elements that can be seamlessly integrated into the tire matrix. This flexible design minimizes disruption to the tire's structural integrity and reduces the creation of harmful air enclosures, while still ensuring permanent electrical and mechanical connection for reliable identification.
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 design enhances the tunability and resilience of RFID antennas, minimizing damage risk and enabling precise resonance tuning without increasing antenna size, thus improving overall performance and reducing production complexity.
Implementation Method 1
Small reflections of the electro-magnetical signal arise at the transitions between the segments and influence the resonance frequency
Implementation Method 2
the resonance frequency can be tuned only by shortening the length of the antenna
Data Source
AI summary
Tuneable linear-antenna transponders and methods of making and using thereof are described herein. In some embodiments, the transponder includes two radiators formed of a conductive material, wherein the radiators may be identical or different. In some embodiments, the radiators are divided into a multitude of segments, wherein each segment is in the form of a linear segment or helical spring segment or cylindrical segment. In some embodiments, two of the consecutive segments are different in either shape and/or winding width of the helical spring. The distinct transmission line segments provide additional degrees of freedom, which enables finer/improved tunability of the antenna resonance.