RFID Device Protective Cap for Non-Planar Stress
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Solution Overview
Problem
RFID devices face structural stress and functionality compromise when attached to non-planar surfaces, leading to potential fracturing and detachment of antennas and IC chips due to bending and misalignment issues.
Innovation Solution
The implementation of a protective cap structure over the chip and antenna, combined with a flexible housing that allows the RFID inlay to be positioned within a cavity, providing a dynamic and stress-reduced environment, using materials like polyethylene and polyurethane for the cap and suitable flexible materials for the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RFID label is attached to a non-planar surface or bent, then the label can be applied to curved or flexible objects, but the die/antenna juncture is subject to stress and prone to fracturing and breaking
Solution Approach 1:
The protective cap is divided into multiple functional layers: a flexible substrate layer, a cushioning layer (such as foam or gel), and a protective top layer. This segmentation allows each layer to perform its specific function - the substrate provides structural support, the cushioning layer absorbs stress, and the top layer provides environmental protection, collectively preventing damage to the die/antenna juncture during bending.
Solution Approach 2:
The protective cap incorporates a cushioning layer made of stress-absorbing materials positioned between the die/antenna juncture and external forces. This beforehand cushioning prevents stress concentration at the fragile junction points before bending occurs, thereby preventing fracturing and breaking while allowing the label to be applied to non-planar surfaces.
2Adaptability or versatility
If the antenna is subject to bending, then the label can conform to curved surfaces, but the antenna functionality is compromised and it may become detached from the substrate
Solution Approach 1:
The protective cap is constructed with a flexible substrate that can bend and conform to curved surfaces while maintaining structural integrity. This flexible shell protects the antenna during bending operations, preventing detachment from the substrate and maintaining antenna functionality by preserving electrical continuity and physical attachment.
3Manufacturing precision
If intermediate connection leads are used to interconnect IC chips with antennas, then alignment precision is improved, but the device complexity increases
Solution Approach 1:
The protective cap integrates multiple functions into a single unified structure: it protects the chip, shields the antenna, provides structural support, and maintains alignment between components. By merging these functions into one element rather than using separate intermediate connection leads, the design achieves improved alignment precision while avoiding the increased device complexity that would result from multiple discrete components.
Data Source
AI summary
The present invention relates to a dynamic RFID device assembly which is able to withstand the additional stresses of using RFID devices in a non-planar arrangement. The invention includes the provision of a protective cap to prevent the fracturing or breakage of chip and antenna connection. The RFID device of the present invention can be included in a housing which may also be flexible thereby adding additional stability to the device.