RFID Tag Loop Conductor Stabilizes Coupling
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Solution Overview
Problem
Existing RFID tags with RFIC modules and antennas experience significant variations in electromagnetic field coupling due to positional and postural variations, affecting communication characteristics, especially under repetitive deformation conditions.
Innovation Solution
The RFID tag design includes an RFIC module with a substrate, an RFIC chip, and a loop conductor connected to the chip, paired with an antenna base material featuring a radiating portion and a coupling portion for electromagnetic field coupling, utilizing a first and second loop pattern on opposing substrate surfaces connected via an interlayer conductor, which stabilizes the coupling and protects the coupling portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the spiral coil is formed on one surface of the silicon substrate, then the device complexity is reduced, but the communication characteristics vary greatly when the RFIC module is mounted upside down
Solution Approach 1:
The invention transitions from a single-surface coil to a three-dimensional dual-surface coil structure. The loop conductor extends through the substrate thickness direction, forming first and second loop patterns on opposite surfaces connected by an interlayer conductor, creating a volumetric electromagnetic field that is insensitive to mounting orientation.
Solution Approach 2:
The loop conductor is nested within the substrate structure, with the interlayer connection conductor extending through the substrate to connect the two loop patterns. This integrated nested design maintains structural compactness while achieving three-dimensional electromagnetic coupling.
2Reliability
If the RFIC module is mounted without variations at a certain position and posture, then the communication characteristics are stable, but the ease of operation is reduced
Solution Approach 1:
By creating a three-dimensional loop conductor structure that penetrates the substrate, the invention achieves omnidirectional electromagnetic field distribution. This allows stable communication characteristics regardless of the RFIC module's mounting position or orientation on the antenna base material.
Solution Approach 2:
The dual-surface loop conductor structure serves multiple functions: it maintains stable electromagnetic coupling from any mounting orientation, provides mechanical support for the RFIC chip, and enables flexible placement on the antenna base material without strict positional requirements.
3Duration of action of stationary object
If the RFID tag is used under severe conditions causing repetitive deformations, then the durability is improved, but the connection between RFIC module and antenna may be compromised
Solution Approach 1:
The invention uses a flexible substrate that can withstand repetitive deformations such as washing. The loop conductor and interlayer connection conductor are integrated into this flexible substrate, allowing the entire structure to bend and deform without compromising the electrical connections between the RFIC module and antenna.
Solution Approach 2:
The interlayer connection conductor is embedded within the substrate structure, nesting the electrical connection path within the substrate's volume. This protected nested configuration shields the connections from external mechanical stress and deformation, maintaining reliability under severe usage conditions.
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 configuration ensures consistent electromagnetic field coupling between the RFIC module and antenna, maintaining stable communication characteristics even under repetitive deformations, such as those encountered during washing or impact.
Implementation Method 1
the loop conductor (26) and the antenna conductor (54) are electromagnetic field coupled together
Data Source
AI summary
An RFID tag with an RFIC module including a substrate, an RFIC chip disposed on the substrate, and a loop conductor disposed on the substrate and connected to the RFIC chip; and an antenna base material mounted with the RFIC module and including an antenna conductor with a radiating portion radiating radio waves and a coupling portion connected to the radiating portion, for electromagnetic field coupling with the loop conductor. Moreover, the loop conductor includes a first loop pattern formed on a first main surface of the substrate, a second loop pattern formed on a second main surface confronting the first main surface, and an interlayer connection conductor extending through the substrate, for connecting the first and the second loop patterns in series.