Planar RFID Tag Antenna for Liquid-Filled PET Bottles
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Solution Overview
Problem
RFID tags attached to containers with liquids face challenges in maintaining antenna integrity during handling and reading due to liquid interference, as existing solutions that project the antenna are prone to damage.
Innovation Solution
A RFID tag design featuring a loop conductor connected to an IC chip and an antenna unit with linear elements extending from the loop, each approximately ¼ of the wavelength, ensuring impedance matching and reducing electrical coupling with liquids, thus preventing antenna damage and maintaining reading functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna projects from the container to increase distance from liquid, then identification information can be read successfully, but the antenna may be damaged during storage or transport
Solution Approach 1:
The patent transitions from a three-dimensional protruding antenna structure to a two-dimensional planar antenna pattern embedded in the label. The antenna elements are arranged in specific geometric configurations (linear, circular, or rectangular patterns) on the label surface, maintaining effective reading distance through optimized element spacing and geometry rather than physical projection.
Solution Approach 2:
The antenna elements are nested within the label structure itself, with the antenna pattern integrated into the label's planar surface. The IC chip is positioned at the center of the antenna pattern, with antenna elements radiating outward in a nested configuration that maintains compactness while preserving reading functionality.
2Stability of the object's composition
If the antenna is placed near the liquid in the container, then the structure remains compact and protected, but the antenna characteristics change and reading fails
Solution Approach 1:
The patent applies local quality by creating specific zones within the label structure: the IC chip is positioned at the center where electromagnetic field concentration is optimal, while antenna elements are distributed in surrounding zones with specific spacing. This spatial differentiation of functional zones allows the antenna to maintain stable characteristics while remaining in close proximity to the liquid without direct contact interference.
Solution Approach 2:
The patent optimizes antenna performance by adjusting critical parameters including element length, spacing between elements, pattern geometry (linear, circular, or rectangular), and overall antenna configuration. These parameter variations enable the antenna to achieve optimal impedance matching and radiation characteristics while maintaining a compact planar structure suitable for label application.
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
The RFID tag successfully reads identification information without damaging the antenna, even when exposed to liquids, by reducing impedance disturbances and maintaining effective communication distances.
Implementation Method 1
an antenna unit that includes a linear element. The linear element includes two linear-shaped conductors connected to the loop conductor, extending away from each other from the loop conductor, and each having an electrical length that is a multiple of approximately 1⁄4 of a wavelength of a frequency used
Data Source
AI summary
A RFID tag for placement on a surface of a container that contains a liquid is provided. The RFID tag includes an IC chip configured to store identification information, a loop conductor connected to the IC chip, and an antenna unit that includes two conductor units connected to the loop conductor and extending away from each other from the loop conductor.