Metal Biometric Payment Card Layout for EMI Isolation

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Solution Overview

Problem

Existing biometric security systems on premium transaction cards, such as those made of metal or ceramic, face challenges in integrating biometric sensors and payment interfaces effectively due to electrical and magnetic interference from the metal components.

Innovation Solution

A metal transaction card design incorporating a biometric sensor and payment interface components, with non-metal layers for isolation and a logic component for matching detected biometric information, allowing secure financial transactions only upon a match, and using contactless communication technologies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If metal layers are used in transaction cards, then premium appearance and durability are improved, but electrical and magnetic interference with biometric sensors and payment interfaces increases

Engineering Contradiction:

Improvecard durabilityVSAvoidelectrical and magnetic interference

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The card is divided into distinct layers: metal layers for durability and appearance, non-conductive layers for isolation, and functional layers for biometric and payment components. This segmentation allows each layer to perform its specific function without interfering with others.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Non-conductive layers are introduced as intermediary elements between the metal layers and the functional components (biometric sensor, payment interface). These intermediary layers block electrical and magnetic interference from the metal while allowing the functional components to operate correctly.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If biometric sensors and payment interfaces are integrated into metal cards, then transaction security and functionality are improved, but manufacturing complexity increases

Engineering Contradiction:

Improvetransaction securityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The card structure is segmented into separate functional layers (metal layers, non-conductive layers, functional layers) that can be manufactured independently and then assembled. This reduces the complexity of manufacturing each individual layer while maintaining the overall functionality and security.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The biometric sensor and payment interface components are embedded within the layered card structure, with functional layers positioned between metal layers. This nesting approach integrates multiple functions into a single compact unit without requiring complex external assemblies.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Object-affected harmful factors

If non-metal layers are added for isolation, then electrical and magnetic interference is reduced, but card thickness and manufacturing steps increase

Engineering Contradiction:

Improveelectrical and magnetic interferenceVSAvoidcard thickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

Non-conductive layers are applied selectively only in areas where electrical and magnetic isolation is needed (between metal layers and functional components), rather than covering the entire card. This localized approach provides necessary isolation while minimizing the increase in overall card thickness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The card uses composite material construction combining metal layers with non-conductive layers in a multi-layer structure. This composite approach allows the thin non-conductive layers to effectively block interference while maintaining the card's overall thin profile through optimized layer arrangements.

Inventive Principle:

Principle #40Composite materials

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

Enables secure and efficient financial transactions by isolating biometric sensors and payment interfaces from metal interference, ensuring accurate biometric verification and reliable contactless communication.

Implementation Method 1

configured to detect a change in reflected radiation corresponding to biometric user information

Methodology Applied

Scientific EffectReflected radiation detection: Reflection

Implementation Method 2

one or more antennae configured for contactless communication with a card reader, such as via short-range wireless interconnection

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS12554958B2Metal card with biometric features

Publication Date: 2026.02.17 COMPOSECURE LLC

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.