Dual-Interface Smart Card Antenna Inlay for Metal Shielding
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Solution Overview
Problem
Contactless chip cards with metal plates suffer from electromagnetic interference, leading to degraded contactless communication performance and asymmetric operation.
Innovation Solution
The dual interface smart card design incorporates metal plates on both sides of the card, using a metal sheet with antennae inlays and adhesive layers to ensure symmetric communication capabilities, while maintaining standard dimensions and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a metal plate is added to a contactless chip card to increase weight and premium feel, then the card's perceived quality and weight improve, but electromagnetic interference occurs leading to degraded contactless communication performance
Solution Approach 1:
The card is divided into distinct functional layers: a plastic card body, a metal plate layer for weight and premium feel, and antenna elements positioned in specific zones. This segmentation allows the metal plate to be included without completely blocking electromagnetic signals, as the antenna elements are positioned in zones where signal transmission is not obstructed by the metal.
Solution Approach 2:
The antenna elements are positioned in specific local zones of the card where electromagnetic signal transmission is optimized. The metal plate is strategically placed in areas that do not interfere with these critical signal zones, allowing different parts of the card to have different functional qualities - weight provision in non-critical areas and signal transmission in critical antenna zones.
2Adaptability or versatility
If a metal plate is added to a contactless chip card, then the card provides symmetric communication capabilities on both sides, but electromagnetic interference causes asymmetric operation and degraded performance
Solution Approach 1:
The patent intentionally introduces asymmetric elements to compensate for the symmetry problem caused by the metal plate. Different antenna designs or configurations are used on each side of the card to counterbalance the asymmetric interference patterns created by the metal plate, thereby achieving overall symmetric communication performance despite the asymmetric interference environment.
Solution Approach 2:
The solution moves from a two-dimensional planar antenna design to a three-dimensional configuration by positioning antenna elements at different depths and orientations within the card structure. This dimensional change allows the antennas to operate in electromagnetic zones that are less affected by the metal plate interference, enabling symmetric communication from both sides of the card.
3Ease of manufacture
If the card uses plastic material to meet ISO standards for flexibility and cost, then manufacturing cost and flexibility improve, but the card lacks the premium feel and weight associated with metal cards
Solution Approach 1:
The patent merges two previously separate card concepts into a single hybrid structure: the plastic card body maintains flexibility, durability, and cost-effectiveness while meeting ISO standards, while the integrated metal plate layer provides the premium feel, weight, and aesthetic qualities of metal cards. This combination allows the card to simultaneously achieve properties that were previously mutually exclusive.
Solution Approach 2:
The card employs a composite structure combining plastic and metal materials in a single integrated design. The plastic substrate provides flexibility and compliance with ISO standards, while the metal plate overlay provides weight, premium appearance, and structural rigidity. This composite approach allows the card to exhibit properties of both materials without the drawbacks of using either material alone.
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 dual interface smart card maintains effective contactless communication on both sides, adhering to ISO standards and providing a premium feel, while ensuring durability and compliance with regulatory requirements.
Implementation Method 1
an antenna configured to transmit and receive signals
Implementation Method 2
a metal plate positioned between the front and back surfaces of the card body... the metal plate creates a shielding effect that prevents the booster antennae from being coupled to each other
Implementation Method 3
one or more adhesive layers, wherein the one or more adhesive layers are used to affix and position the antenna segment inlay in the metal sheet
Data Source
AI summary
The present invention relates to a smart card and/or a payment card that has a dual interface, which optionally comprises one or more of a first antenna, a second antenna, a wire loop, various inlays, one or more metal layers, one or more printed PVC layers, and one or more contact, contactless, and/or integrated circuit chips. The first antenna and second antenna are part of a antenna segment inlay that is designed to fit snuggly into the contours of the one or ore metal layers.