Capacitive Microchip Metallization for Banknote Authentication
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Solution Overview
Problem
Current methods for securing banknotes against forgery, particularly through electronic security features, are hindered by high integration costs and the inability to efficiently read serial numbers within the short time frames encountered in counting devices, due to the complexity and cost of integrating RFID chips with contact pads on flexible documents like banknotes.
Innovation Solution
A microchip with integrated metallization layers on both sides, functioning as electrodes for capacitive readout, is embedded into or attached to banknotes, allowing for contactless authentication using capacitive coupling with counterelectrodes, eliminating the need for external antennas and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional RFID chips with external antennas are integrated into banknotes, then contactless readout capability is achieved, but manufacturing costs increase significantly due to complex antenna-chip connection processes
Solution Approach 1:
The patent merges the antenna function directly into the chip structure by using metallization layers that are already present on the chip substrate. This eliminates the need for separate external antennas and their complex connection processes, thereby reducing manufacturing costs while maintaining contactless readout capability through capacitive coupling.
Solution Approach 2:
The metallization layers on the chip serve multiple functions: they act as both electrical connection traces and as the antenna structure for capacitive coupling. This multi-functionality eliminates the need for additional antenna components and simplifies the manufacturing process.
2Adaptability or versatility
If conventional RFID chips with contact pads are used in flexible documents, then electronic security features are enabled, but the contacts delaminate and tear open due to high mobility and bending
Solution Approach 1:
The patent combines the electrical connection function and the antenna function into a single integrated structure using metallization layers that are part of the chip substrate. This eliminates the need for separate contact pads that would be susceptible to delamination and tearing during bending and mobility.
Solution Approach 2:
The patent uses thin metallization layers integrated into the chip substrate that can flex with the document without delaminating. These metallization layers are designed to accommodate the flexibility and bending of the document while maintaining electrical connectivity and antenna functionality.
3Ease of operation
If chip-external antennas are connected to contact pads on the chip, then electromagnetic communication is enabled, but complex and expensive process steps are required during production
Solution Approach 1:
The patent merges the antenna structure with the chip's existing metallization layers, eliminating the need for separate antenna components and their complex assembly processes. This integration significantly simplifies the production process while maintaining electromagnetic communication capability through capacitive coupling.
4Manufacturing precision
If exact placement of the chip relative to the antenna is performed, then proper electrical connection is achieved, but manufacturing costs increase due to high placement effort
Solution Approach 1:
The patent merges the antenna function into the chip structure itself, eliminating the need for separate antenna components that would require precise placement relative to the chip. This integration removes the alignment step entirely from the manufacturing process, reducing both complexity and cost.
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 solution enables reliable, cost-effective, and efficient authentication of banknotes and other documents, even under conditions of high mobility and bending, by simplifying the integration process and ensuring robustness without the need for complex antenna connections.
Implementation Method 1
the first and second metallization layers are each electrically coupled to the integrated circuit and function as electrodes for a capacitive readout of the integrated circuit
Data Source
AI summary
Among other things, the invention concerns an apparatus for securing a product against forgery, the apparatus including a microchip with an integrated circuit that may be read out in a contactless manner, a first metallization layer arranged on a first chip side of the microchip, and a second metallization layer arranged on a second chip side opposite to the first chip side. The first and second metallization layers are each electrically coupled to the integrated circuit and function as electrodes for a capacitive readout of the integrated circuit. The microchip is fixable to the product or integrable into the product. The invention further concerns the use of a microchip as a security feature in a product as well as a method for securing a product against forgery.