Metal Chip Card Capacitor Structure for Contactless Coupling
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Solution Overview
Problem
Producing a contactless metal chip card is challenging due to difficulties in constructing finely slotted structures in the metal card body, which are required for the booster antenna and capacitor components.
Innovation Solution
A method involving a metal plate with slots forming a booster antenna, where a dielectric layer and an electrically conductive layer are applied to create a capacitor, with the conductive layer connected to the metal plate via vias or conductive glue, allowing for inductive coupling with a chip module without additional booster antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If finely slotted structures are constructed in the metal card body for booster antenna and capacitor components, then contactless functionality is achieved, but manufacturing complexity and difficulty increase significantly
Solution Approach 1:
The patent divides the capacitor structure into separate components: a first electrically conductive structure and a second electrically conductive structure, with at least one being discontinuous (slotted). This segmentation allows the complex slotted pattern to be achieved through simpler manufacturing processes like screen printing or applying discontinuous conductive layers, rather than requiring precise slot cutting in solid metal plates.
Solution Approach 2:
The patent transitions from planar slot patterns to three-dimensional layered structures. By stacking multiple conductive layers with dielectric materials between them, the capacitor is formed in vertical space rather than requiring extensive horizontal slotting. This dimensional approach simplifies manufacturing while achieving the required electrical characteristics.
2Reliability
If additional booster antennas are integrated into the chip module, then inductive coupling is improved, but device complexity increases
Solution Approach 1:
The patent combines the booster antenna function with the capacitor structure. The discontinuous second electrically conductive structure serves dual purposes: forming part of the capacitor and acting as the booster antenna. This merging eliminates the need for separate booster antenna components, reducing device complexity while maintaining inductive coupling efficiency.
Solution Approach 2:
The second electrically conductive structure is designed to perform multiple functions simultaneously: it forms a capacitor with the first conductive structure and also serves as the booster antenna for inductive coupling. This multi-functional design reduces the total component count and simplifies the chip module structure.
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 method simplifies the production of metal chip cards by integrating the capacitor and booster antenna components, ensuring electrical compliance with specifications like EMV Contactless, while minimizing eddy currents and allowing for flexible design and arrangement of the capacitor.
Implementation Method 1
the coupling region (104) is configured for inductively coupling the metal plate (106) to an antenna of the chip
Implementation Method 2
minimizing eddy currents
Data Source
AI summary
A chip card body including a metal plate having at least one slot which defines a current flow path on the metal plate, and having a coupling region to accommodate a chip with an antenna, wherein the coupling region is configured to inductively couple the metal plate to the antenna of the chip, a dielectric layer applied to the metal plate, an electrically conductive layer applied to a side of the dielectric layer opposite the metal plate, and at least one electrically conductive coupling between the metal plate and the electrically conductive layer, wherein the metal plate, the dielectric layer and the electrically conductive layer form a capacitor.