Dual Interface Metal Card Void Antenna Design

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Solution Overview

Problem

Existing dual interface metal transaction cards face challenges in maintaining structural rigidity and the desired 'metallic' sound while incorporating both contact and contactless payment functionalities.

Innovation Solution

A dual interface transaction card design featuring a metal card body with a contact-only transaction module and a contactless transaction module disposed in a void within the card body, allowing for independent personalization of the transaction circuits and integration of an antenna without the need for a booster antenna or gap in the card edge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a booster antenna or gap in the card body edge is used to facilitate contactless signals, then contactless functionality is improved, but the structural rigidity and metallic sound of the card deteriorate

Engineering Contradiction:

Improvecontactless functionalityVSAvoidstructural rigidity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The contactless transaction module is extracted and disposed in a void within the card body, separate from the metal card body structure. This allows the antenna to be isolated from the metal, preventing degradation of the metallic sound and structural rigidity while maintaining contactless functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The contactless transaction module is nested within a void in the card body, with the void being open to one or both surfaces of the card. This nested configuration allows the antenna to be housed within the card structure without compromising the external metal card body's integrity and acoustic properties.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If a booster antenna or gap in the card body edge is used to facilitate contactless signals, then contactless functionality is improved, but the metallic sound of the card deteriorates

Engineering Contradiction:

Improvecontactless functionalityVSAvoidmetallic sound

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A non-conductive substrate is used as an intermediary between the antenna and the metal card body. This intermediary material allows the antenna to function while preventing direct interaction with the metal that would degrade the metallic sound, effectively mediating between the conflicting requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design enables dual interface functionality without compromising the card's structural rigidity or metallic sound, providing a seamless contactless payment experience while maintaining the card's metallic characteristics.

Implementation Method 1

The contactless transaction module comprises a second transaction circuit and an antenna

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Implementation Method 2

a ferrite layer

Methodology Applied

Scientific EffectFerromagnetism: Ferromagnetism

Data Source

PatentUS12333364B2Metal dual interface card

Publication Date: 2025.06.17 COMPOSECURE LLC

AI summary

A dual interface transaction card includes a metal card body having first and second surfaces. A contact-only transaction module is secured in the card body, the contact-only transaction module including contact pads disposed on the first surface of the card body and including a first transaction circuit. A contactless transaction module is secured in a void in the metal card body. The contactless transaction module includes a second transaction circuit and an antenna. Also disclosed is a process for manufacturing the dual interface transaction card. The process includes the steps of constructing a metal card body having the first and second surfaces, securing the contact-only transaction module in the metal card body, forming the void in the metal card body, and securing the contactless transaction module in the void.