RFID Loop Antenna With T-Shaped Opening for Liquid-Filled Tubes
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Solution Overview
Problem
RFID tags applied to liquid containers, such as blood collection tubes, experience a shortened communication distance due to changes in antenna impedance when the container holds liquid.
Innovation Solution
An RFID tag with a loop-shaped conductor antenna featuring a T-shaped opening where no conductor is formed, allowing for impedance matching and maintaining effective communication regardless of the presence or absence of liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional loop antenna is used in an RFID tag applied to a liquid container, then the antenna structure is simple, but the communication distance is shortened due to impedance change when liquid is present
Solution Approach 1:
The loop antenna is segmented by introducing a T-shaped opening that divides the continuous conductor into distinct sections. This segmentation allows the antenna to maintain its electrical characteristics despite the presence of liquid, as the opening prevents liquid-induced impedance changes from affecting the entire loop uniformly.
Solution Approach 2:
The T-shaped opening creates a specific local region within the antenna loop where the conductor is intentionally interrupted. This local modification at the opening region allows the rest of the antenna to maintain its radiation properties while the opening region specifically addresses the impedance stability issue when liquid is present.
2Reliability
If the antenna conductor is made continuous to maintain signal integrity, then the electrical connection is good, but the impedance characteristics change when liquid is held in the container
Solution Approach 1:
The continuous conductor is segmented by the T-shaped opening, creating distinct conductor sections that are electrically connected through the opening geometry. This segmentation prevents liquid from creating a continuous conductive path through the antenna, thereby maintaining impedance stability.
Solution Approach 2:
The T-shaped opening acts as an intermediary structure that mediates between the need for electrical connectivity and the need for impedance stability. The opening geometry provides a controlled interaction point that prevents liquid-induced impedance changes while maintaining the antenna's electrical function.
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 achieves a consistent communication distance and impedance matching, ensuring reliable operation with and without liquid in the container.
Implementation Method 1
making a capacitance component inside an IC chip and an inductance component of a bypass conducting path provided in an antenna resonate
Data Source
AI summary
The present invention provides an RFID tag to be applied to a container for holding liquid. To achieve a good communication distance regardless of the presence or absence of liquid, the RFID is applied to a container for holding liquid, and includes an IC chip on which identification information is recorded, and an antenna made of a loop-shaped conductor connected to the IC chip, and the antenna has a T-shaped opening in which the conductor is not formed.