Meandering RFID Antenna Bandwidth and Coupling
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Solution Overview
Problem
RFID tags in the UHF band face challenges in bandwidth expansion and frequency adaptability due to varying frequency bands across countries and material dielectric constants, leading to complex manufacturing and limited convenience in usage.
Innovation Solution
The antenna design incorporates meandering and radiating parts with specific width and length configurations to increase bandwidth, adjust path lengths, and reduce electrostatic coupling, allowing for improved radiation efficiency and adaptability across different frequency bands and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna configuration is individually designed for each frequency band, then the frequency adaptability is improved, but the device complexity and manufacturing complexity increase
Solution Approach 1:
The patent applies universality by designing a single antenna structure that can operate across multiple frequency bands (UHF and L-band) without requiring individual configurations for each band. The meandering line and radiating parts are designed to support both frequency ranges, eliminating the need to manufacture different antenna designs for different countries or applications.
Solution Approach 2:
The patent employs dynamics by making the antenna structure adaptable to different operating conditions. The meandering line configuration with adjustable path length and the radiating parts with variable widths allow the antenna to dynamically adjust its electrical characteristics to match different frequency bands and dielectric materials, providing frequency adaptability without increasing manufacturing complexity.
2Manufacturing precision
If the antenna configuration is modified to correspond to different materials, then the frequency band accuracy is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by designing the antenna with adjustable geometric parameters (meandering line path length, radiating part widths) that can be optimized for different dielectric materials and frequency bands. This allows a single manufacturing process to produce antennas that can be configured for different materials without requiring entirely different designs, thus improving frequency band accuracy while maintaining ease of manufacture.
3Ease of operation
If the RFID tag size is reduced, then the ease of operation is improved, but the bandwidth increases
Solution Approach 1:
The patent applies dimensionality change by using a meandering line configuration that extends the electrical path length in a compact physical footprint. The meandering structure allows the antenna to achieve the necessary electrical length for wide bandwidth operation while maintaining a small physical size suitable for label applications, thus resolving the contradiction between small size and bandwidth.
4Area of stationary object
If the meandering parts are placed closer to the radiating parts, then the area is reduced, but electrostatic coupling increases
Solution Approach 1:
The patent applies asymmetry by designing the meandering parts with non-uniform width variations, where the width changes along the meandering path to control the electrical characteristics. This asymmetric design allows the meandering parts to be placed closer to the radiating parts while managing electrostatic coupling effects through the varying width profile, thus reducing area without excessively increasing harmful coupling.
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 antenna's bandwidth, improves radiation efficiency, and simplifies manufacturing by allowing the RFID tag to operate effectively across different frequency bands and materials, increasing convenience and efficiency in usage.
Implementation Method 1
a pair of radiating parts that are formed of conductors and connected to outer ends of the pair of meandering parts, respectively
Implementation Method 2
meandering parts that are formed of conductors shaped as a pair of meandering lines, connected to the power feeding part, and extend from the power feeding part toward both ends of the power feeding part
Implementation Method 3
it is possible to suppress the electrostatic coupling occurring between the ends of the radiating parts facing the meandering parts and the portions of the radiating parts facing the sides closest to the radiating parts among the plurality of sides of the meandering parts
Data Source
AI summary
An antenna for an RFID tag includes each power feeding parts 11 that is formed of a conductor, meandering parts 13a and 13b that are formed of conductors shaped as a pair of meandering lines, connected to the power feeding parts 11, and extend from the power feeding parts 11 toward both ends of the power feeding parts 11, respectively, a pair of radiating parts 14a and 14b that are formed of conductors and connected to outer ends of the pair of meandering parts 13a and 13b, respectively. The meandering parts 13a and 13b include a plurality of sides arranged in a longitudinal direction where the meandering parts 13a and 13b extend. Further, the lengths of portions, where the ends of the radiating parts 14a and 14b facing the meandering parts 13a and 13b face the sides closest to the radiating parts 14a and 14b among the plurality of sides of the meandering parts 13a and 13b in a direction orthogonal to the longitudinal direction, are smaller than the widths of the widest portions of the radiating parts.