Miniaturized 3D Antenna for Memory Card Magnetic Field Coupling
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Solution Overview
Problem
Existing contactless devices, such as memory cards with loop antennas parallel to the substrate, face challenges in capturing magnetic fields when inserted into mobile devices due to absorption by metal regions within the device, leading to ineffective communication with card readers.
Innovation Solution
A miniaturized 3D inductive coil antenna is placed at the outer edge of the memory card, oriented to maximize coupling with the magnetic field from the reader, using a transformer design with optimized geometry and materials to enhance coupling efficiency, allowing the card to function even when inserted perpendicular to the reader.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a loop antenna is placed parallel to the substrate in a memory card, then the antenna can be integrated into the card structure, but the magnetic field is absorbed by metal regions within the mobile device, preventing effective communication with the card reader
Solution Approach 1:
The patent transitions from a 2D planar antenna layout parallel to the substrate to a 3D立体 coil structure that extends in multiple dimensions. The coil is positioned at the edge of the memory card and oriented perpendicular to the substrate, creating a three-dimensional magnetic field coupling path that bypasses the metal absorption regions within the mobile device housing.
Solution Approach 2:
Instead of placing the antenna parallel to the substrate as in conventional designs, the patent inverts the orientation by positioning the coil perpendicular to the substrate with its plane facing the outer edge of the memory card. This inverted configuration allows the magnetic field to couple through the edge of the card where metal absorption is minimal.
2Ease of operation
If the memory card is inserted perpendicular to the reader, then the card can be held in a convenient position, but the metal regions within the device obstruct the magnetic field from reaching the antenna
Solution Approach 1:
The patent creates a three-dimensional magnetic field path by positioning the coil perpendicular to the substrate. This 3D field distribution allows effective coupling whether the card is held parallel or perpendicular to the reader, as the magnetic field can penetrate through the edge of the card in multiple orientations.
Solution Approach 2:
The antenna is pre-positioned at the outer edge of the memory card in a specific orientation before insertion. This preliminary positioning ensures that when the card is inserted in any orientation, the antenna is already in an optimal position to receive magnetic field signals without requiring adjustment during use.
3Device complexity
If a conventional loop antenna is used, then the design is simple, but the antenna cannot effectively capture magnetic fields when the card is inserted into a mobile device
Solution Approach 1:
The patent employs a 3D立体 coil structure instead of a conventional 2D planar loop antenna. This three-dimensional configuration increases the effective area for magnetic field coupling and allows the antenna to capture fields from multiple directions, significantly improving field capture capability while maintaining integration within the memory card.
Solution Approach 2:
The patent concentrates the antenna structure at the outer edge of the memory card rather than distributing it across the substrate. This localized positioning at the edge creates a region of high magnetic field sensitivity where metal absorption is minimal, optimizing field capture capability in the most effective location.
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 miniaturized antenna effectively captures the magnetic field, enabling reliable communication between the memory card and the reader, even when the mobile device is held in a position that would otherwise obstruct the field, by positioning the antenna to align with the field's direction and using a transformer design that maximizes coupling efficiency.
Implementation Method 1
A miniaturized 3D inductive coil antenna is placed at the outer edge of the memory card, oriented to maximize coupling with the magnetic field from the reader
Implementation Method 2
using a transformer design with optimized geometry and materials to enhance coupling efficiency
Data Source
AI summary
A contactless device includes a miniaturized antenna. The antenna includes an inductive coupling element that presents a field coupling surface area to couple to a magnetic field. The inductive element may be made of layers where conductive loops are formed parallel to the layers or perpendicular to the layers. When conductive loops are formed perpendicular to the layers, the effective field coupling surface area is increased. The inductive element is positioned on an outside edge of a memory card compatible device with the field coupling surface area perpendicular to the card.