RFID Antenna Lamination for Humidity Resistance
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Solution Overview
Problem
Contactless RFID devices integrated into security documents like passports are not resistant to humid environments, leading to antenna fractures and electrical connection ruptures, especially when exposed to washing machines, and existing plastic inlays have suboptimal bonding with paper materials.
Innovation Solution
A radio frequency identification device with an antenna screen-printed on a fibrous support, laminated with a thermoplastic layer and a paper layer, trapping the antenna and chip to provide water resistance and humidity protection, using a manufacturing method that includes screen printing, adhesive dielectric material application, and hot press moulding to ensure secure electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna is screen-printed on paper support, then the device can be integrated into passport, but the antenna absorbs water and swells causing fractures and electrical connection ruptures
Solution Approach 1:
The antenna and chip are embedded within a thermoplastic layer that is itself embedded within paper layers, creating a nested structure where each layer protects the components inside. This nesting approach allows the RFID device to maintain both paper compatibility for passport integration and water resistance through the thermoplastic encapsulation.
Solution Approach 2:
The invention combines paper support material with thermoplastic encapsulation material to create a composite structure. The paper provides compatibility with passport integration while the thermoplastic provides water resistance and structural stability, resolving the contradiction between adaptability to passport and reliability of electrical connections.
2Reliability
If a plastic inlay is used for the RFID device, then water resistance is improved, but bonding with paper passport materials is suboptimal
Solution Approach 1:
The invention applies different material properties to different parts of the RFID device: the outer layers are paper to match the passport material and provide optimal bonding, while the inner encapsulation is thermoplastic to provide water resistance. This local differentiation of material quality resolves the contradiction between bonding strength and water resistance.
3Device complexity
If the antenna is exposed to humid environment, then the device can remain simple in structure, but the antenna swells and causes fractures
Solution Approach 1:
The thermoplastic layer acts as a flexible shell that encapsulates the antenna and chip, protecting them from humid environments while maintaining the overall simplicity of the device structure. This thin film approach provides protection without significantly increasing structural complexity.
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 provides a waterproof RFID device that can withstand accidental washing machine passages and maintains electrical integrity in humid conditions, with enhanced bonding and resistance to delamination, ensuring continued functionality and security.
Implementation Method 1
a thermoplastic layer and a layer of paper are laminated onto the antenna support so that the antenna and the chip are trapped in the thermoplastic
Implementation Method 2
The chip is usually not powered and receives its energy by an electromagnetic coupling between the antenna of the reader and the antenna of the RFID
Data Source
AI summary
The invention concerns a radio frequency identification device (RFID) featuring an antenna (12) screen-printed on a fibrous support and a chip (10) connected to the connection terminals (17 and 19) of the antenna. According to the main characteristic of the invention, a thermoplastic layer (22) and a layer of paper (24) are laminated on the antenna support (20) so that the antenna and the chip are trapped in the thermoplastic and so that the device is resistant to water and humid environments.