Smart Card Printed Circuit With Tunable Antenna Path Length
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Solution Overview
Problem
The fabrication of dual interface (DIF) smart cards is complex due to the need for separate integration of wire antennas and smart card modules, and this process is challenging with non-plastic materials, limiting material variety and increasing production complexity.
Innovation Solution
A printed circuit with integrated contact and contactless features is designed, allowing a single layout to match resonance frequency with chip capacitance, compatible with various materials, and simplifying the manufacturing process by eliminating the need for a separate wire antenna inlay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wire antenna inlay and smart card module are integrated separately in different factories, then manufacturing flexibility is maintained, but fabrication complexity increases and production efficiency decreases
Solution Approach 1:
The patent combines the wire antenna inlay and smart card module into a single integrated printed circuit that can be manufactured in one factory using one set of tools, eliminating the need for separate integration processes at multiple factories and reducing overall fabrication complexity
Solution Approach 2:
The integrated printed circuit serves multiple functions simultaneously - it provides both the antenna functionality and the smart card module functionality, allowing a single component to replace what previously required separate components and processes
2Adaptability or versatility
If conventional DIF smart card uses separate wire antenna inlay and module integration, then contactless and contact communication are both provided, but manufacturing process becomes multi-factory and time-consuming
Solution Approach 1:
The patent merges the antenna and smart card module functions into a single integrated printed circuit, enabling both contactless and contact communication capabilities to be achieved through one component rather than requiring separate wire antenna inlay and module integration processes
3Adaptability or versatility
If single printed circuit layout is designed to match resonance frequency with chip capacitance, then compatibility with various chips is improved, but design flexibility is reduced
Solution Approach 1:
The patent uses parameter changes in the antenna path portion design to adjust the resonance frequency of the printed circuit, allowing the same basic layout to be adapted to match different chip capacitances by modifying the antenna path length and geometry rather than creating entirely different layouts for each chip type
Data Source
AI summary
The invention relates in various aspects to a printed circuit for integration into a smart card, a smart card with such a printed circuit and to a reel-to-reel tape for use in a fabrication process of a smart card, wherein the reel-to-reel tape comprises a plurality of such printed circuit. In some illustrative embodiments of an aspect, a printed circuit is provided, the printed circuit comprising a printed circuit support, an antenna wiring pattern of at least one winding continuously extending between a first terminal and a second terminal, and at least one antenna path portion continuously extending between a third terminal and a fourth terminal. Herein, each of the at least one antenna path portion extending between the third and fourth terminal can increase a path length of the antenna wiring pattern if connected to the antenna wiring pattern, adding a path length of the at least one added antenna path portion to the initial path length of the antenna wiring pattern.