Biometric Metal Card Structure for Signal Isolation and Contactless Use

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Solution Overview

Problem

Existing biometric security systems in metal or premium transaction cards face challenges in integrating biometric sensors effectively due to interference from metal layers, which affect signal transmission and require additional considerations for isolation and insulation.

Innovation Solution

The integration of biometric sensors in metal transaction cards involves embedding the sensors and payment interface components on a substrate with non-conductive layers to isolate them from the metal, using non-conductive adhesives and plugs, and employing booster antennas to enhance signal transmission, while ensuring secure and contactless communication with card readers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional plastic cards with magnetic strips are used, then card production is simple and成本低, but the cards are susceptible to demagnetization, data corruption, and have limited security

Engineering Contradiction:

Improvedata securityVSAvoidcard structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the fundamental parameters of the card by replacing plastic with metal materials (stainless steel, aluminum alloy, copper alloy) and replacing magnetic strips with biometric features (laser-fingerprints, UV fingerprints, micro-engravings). This transformation fundamentally improves data security while maintaining card functionality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material structures including metal cards with embedded RFID chips, metal layers with biometric features, and multi-layer metal constructions. These composite structures provide both enhanced security and durability while managing the complexity through integrated design.

Inventive Principle:

Principle #40Composite materials

2Reliability

If metal cards with biometric features are implemented, then security and durability are improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecard durabilityVSAvoidmanufacturing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent incorporates biometric features (fingerprints, micro-engravings) directly into the metal card during the manufacturing process itself, rather than adding them later. This preliminary integration simplifies the overall manufacturing by combining multiple steps into the base production process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces traditional mechanical magnetic strip reading systems with optical and electromagnetic detection methods for biometric verification. This substitution enables more secure verification while streamlining the reading mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If RFID chips are embedded in metal cards, then contactless functionality and data storage are enhanced, but the cards become more vulnerable to electromagnetic interference and signal blocking

Engineering Contradiction:

Improvecontactless functionalityVSAvoidelectromagnetic interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies different material properties to different regions of the card. Specific areas are designed with electromagnetic shielding properties while other areas maintain RFID signal transparency. This localized quality optimization allows the card to simultaneously support contactless functionality and resist electromagnetic interference.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the potentially harmful effect of metal's electromagnetic interference into a beneficial security feature. The metal card's natural electromagnetic properties are utilized to block unauthorized scanning and cloning attempts, while controlled regions allow legitimate RFID communication.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentEP4049179B1Metal card with biometric features

Publication Date: 2026.05.06 COMPOSECURE LLC

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AI summary

Metal transaction cards and methods of making metal transaction cards are disclosed. One metal transaction card includes at least one metal layer and an inlay layer comprising a biometric sensor and one or more payment interface components configured to interface with a card reader, a secure element configured to exchange information with the card reader pursuant to processing a financial transaction, and at least one logic component connected to the biometric sensor. The logic component is configured to compare information detected by the biometric sensor to stored information and to enable processing of the financial transaction only upon a detected match between the detected and stored information.