Radio IC Device 3D Wiring for RFID Directionality
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Solution Overview
Problem
RFID tags with loop-shaped radiation patterns suffer from directional variability, leading to reduced radiation directionality when viewed from different angles, which affects their performance in managing articles using non-contact electromagnetic communication.
Innovation Solution
A radio IC device with a radio IC element, a substrate, and planar and wiring electrodes arranged in orthogonal directions, forming loops that enhance coupling and radiation directionality in three dimensions, ensuring consistent performance across various orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If loop-shaped radiation patterns are used to couple conductor with radio IC element, then impedance matching is facilitated, but radiation directionality lowers in the direction where the loop shape appears
Solution Approach 1:
The patent transitions from two-dimensional loop-shaped radiation patterns to three-dimensional wiring electrode configurations. By arranging first and second wiring electrodes on opposite surfaces of the substrate with connections that form loops when viewed from X-, Y-, and Z-directions, the invention creates spatial complexity that maintains radiation directionality in multiple dimensions while preserving impedance matching capabilities.
2Ease of manufacture
If radiation patterns have loop shape only when viewed from one direction, then coupling between conductor and radio IC element is achieved, but radiation directionality changes depending on directions
Solution Approach 1:
The patent employs asymmetric three-dimensional arrangement of wiring electrodes where the configuration differs when viewed from different directions (X-, Y-, and Z-directions). This asymmetric spatial arrangement ensures that loop shapes are formed in multiple viewing directions rather than one, creating consistent radiation directionality across different orientations while maintaining effective coupling between the conductor and radio IC element.
3Device complexity
If dedicated antenna is not used and impedance matching is facilitated through radiation patterns, then device complexity is reduced, but radiation directionality becomes direction-dependent
Solution Approach 1:
The patent makes the wiring electrodes serve multiple functions: they provide electrical connections between the radio IC element and planar conductor, establish impedance matching through their loop configurations, and generate consistent radiation directionality in three dimensions. This multi-functional design eliminates the need for separate dedicated antennas while ensuring reliable and consistent radiation performance across different directions.
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 solution achieves good radiation directionality in all three dimensions, improving the RFID tag's ability to transmit and receive high-frequency signals effectively, regardless of the orientation, thereby enhancing communication efficiency.
Implementation Method 1
a planar conductor arranged on a first surface of the substrate, and a first wiring electrode and a second wiring electrode including respective first ends connected to a pair of input/output electrodes of the radio IC element
Implementation Method 2
an RFID tag includes a radio IC element for storing predetermined information and processing a predetermined radio signal, and an antenna (a 'radiator') for transmitting and receiving a high-frequency signal
Data Source
AI summary
A radio IC device includes a radio IC element arranged to process a high-frequency signal, a substrate on which the radio IC element is mounted, a planar conductor arranged on a first surface of the substrate, and a first wiring electrode and a second wiring electrode including respective first ends connected to a pair of input/output electrodes of the radio IC element. The first wiring electrode and the second wiring electrode are arranged on a second surface of the substrate, the second surface being parallel or substantially parallel to the first surface and including respective second ends electrically connected to the planar conductor, and defining loops when looking at the substrate from X-, Y- and Z-directions orthogonal to one another.