Fingerprint Sensor Antenna Integration for Chip Card Reliability
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Solution Overview
Problem
Existing chip cards with biometric sensors, such as fingerprint sensors, face challenges in being both cost-effective and mechanically reliable due to complex electrical connections and large antenna sizes that increase production costs and reduce mechanical reliability.
Innovation Solution
A sensor device with an integrated fingerprint sensor and antenna using coil-on-module technology for inductive coupling with a booster antenna, eliminating the need for external conductive connections and optimizing size and production costs by integrating a standard booster antenna within the chip card.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical-electrical connections (soldering, adhesive, wire bonds) are used to connect sensor device, RFID antenna and chip card module circuit, then electrical connectivity is achieved, but device complexity and production cost increase while mechanical reliability decreases
Solution Approach 1:
The patent merges the sensor device, RFID antenna, and chip card module circuit into a single integrated substrate structure. The antenna is printed directly on the substrate, and the sensor device is mounted on the same substrate, eliminating the need for separate mechanical-electrical connections between these components. This integration reduces the number of connection points from multiple solder joints and wire bonds to a unified structure, thereby improving mechanical reliability while reducing complexity.
2Reliability
If a large RFID antenna is used to meet contactless data transmission requirements, then data transmission functionality is ensured, but production cost increases and mechanical reliability decreases
Solution Approach 1:
The RFID antenna is merged with the substrate structure itself, being printed directly on the same substrate that supports the sensor device and circuitry. This integration allows the antenna to be formed as a thin, planar trace pattern rather than requiring a large separate component, reducing the overall area occupied while maintaining the necessary electrical characteristics for contactless data transmission.
Solution Approach 2:
The antenna is implemented as a thin film or printed trace on the flexible substrate, replacing what would traditionally be a larger, rigid antenna structure. This thin-film approach allows the antenna to be conformally integrated into the card body, reducing its effective area and improving mechanical reliability by eliminating the need for large, protruding components that would be susceptible to mechanical failure.
3Ease of manufacture
If multiple connection technologies (soldering, anisotropic conductive adhesive, wire bonds) are employed, then electrical connectivity is achieved, but production cost and assembly complexity increase
Solution Approach 1:
The patent combines multiple connection functions into a single integrated substrate structure. The substrate simultaneously provides mechanical support, electrical connectivity through printed traces, and mounting for the sensor device. This eliminates the need for separate soldering, adhesive bonding, and wire bonding operations, reducing both the number of manufacturing steps and the associated costs while simplifying the overall connection architecture.
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 mechanically reliable, inexpensive, and scalable biometric sensor system that meets relevant standards for data transmission and energy supply, enhancing functionality and reducing complexity in assembly and production.
Implementation Method 1
an antenna (106) coupled with the fingerprint sensor (109) for inductive coupling of the fingerprint sensor (109) with a booster antenna
Data Source
AI summary
A sensor device is provided that includes a fingerprint sensor and an antenna coupled with the fingerprint sensor for inductive coupling of the fingerprint sensor with a booster antenna.