Card Data Storage Medium with Ferrite Shielding for Antenna Communication
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Solution Overview
Problem
Metal layers in data carriers interfere with antenna communication, causing shielding and preventing effective data transmission, despite measures like slits or ferrite layers.
Innovation Solution
A data carrier design with a flexible inlay and a continuous metal layer, shielded by a ferrite layer, allowing for enlarged antennas and improved contactless and contact-based data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal layer is introduced to improve wear resistance and quality, then the durability and perceived quality of the data carrier are improved, but the metal layer interferes with or prevents antenna communication and data transmission
Solution Approach 1:
A ferrite layer is introduced as an intermediary between the metal layer and the antenna. This ferrite layer acts as a magnetic shield that blocks electromagnetic interference from the metal layer while allowing the antenna to function properly. The ferrite material absorbs or redirects electromagnetic waves, preventing them from reaching the antenna and causing interference, thus resolving the contradiction between having a continuous metal layer for durability and maintaining reliable antenna communication.
2Object-affected harmful factors
If a slit is introduced to interrupt ring closures in the metal layer, then capacitive influences are reduced, but the metal layer still provides shielding and prevents effective communication
Solution Approach 1:
The ferrite layer serves as a superior intermediary compared to using slits in the metal layer. While slits attempt to reduce capacitive influences by breaking the continuity of the metal layer, the ferrite layer provides a more effective solution by actively shielding the antenna from electromagnetic interference through its magnetic properties, thereby ensuring reliable data transmission without compromising the continuous metal layer structure.
3Power
If the antenna is enlarged to increase transmission power and energy input, then communication effectiveness is improved, but the antenna requires more space that may conflict with other components
Solution Approach 1:
The patent utilizes the third dimension (depth/thickness) of the card structure to accommodate a larger antenna. By positioning the antenna in a recess or cavity within the card body, the design allows for an enlarged antenna configuration without increasing the planar surface area of the card. This vertical spatial arrangement enables greater transmission power and energy input while maintaining compact card dimensions.
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
Enhances transmission power and energy input by using an enlarged antenna, ensuring effective communication and increased metal content without interference.
Implementation Method 1
The upper layer comprises a continuous metal layer and a ferrite layer, the ferrite layer being arranged between the metal layer and the flexible inlay
Implementation Method 2
ferrite layer
Implementation Method 3
at least one antenna
Data Source
AI summary
A data storage medium in the form of a card, includes: a flexible inlay with a contact structure located on an upper face of the inlay. The inlay has an integrated circuit spaced apart from the contact structure and has at least one antenna; an upper layer, which is located above the inlay, wherein the upper layer has an opening, in which the contact structure is located; and a lower layer, which is located below the inlay. The upper layer includes a continuous metal layer and a ferrite layer, the ferrite layer being located between the metal layer and the flexible inlay. A method is provided for producing a data storage medium in the form of a card.