3D Core-Coil NFC Antenna for High Efficiency in Tight Mounting Space
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Solution Overview
Problem
Conventional NFC antennas require increased area to enhance radiation efficiency, which limits space for mounting in portable devices, making it difficult to accommodate both the antenna and other components within the device's constraints.
Innovation Solution
The design features a core member with protrusion portions of varying lengths and shapes, allowing the coil to be wound around these structures, forming an 'H' shape and utilizing pad parts for mounting on a substrate, thereby increasing magnetic flux efficiency and reducing the overall size of the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the loop pattern area is increased to enhance radiation efficiency, then the radiation efficiency is improved, but the available mounting space is reduced
Solution Approach 1:
The patent transitions from a planar loop antenna to a three-dimensional coil structure wound around a magnetic core. This dimensional change allows the magnetic flux to be concentrated within the core volume, achieving high radiation efficiency without requiring a large planar area. The coil is wound around the core in multiple turns, creating a compact volumetric structure that maintains efficient magnetic coupling while occupying minimal footprint space on the substrate.
Solution Approach 2:
The patent employs a composite structure combining a magnetic core material with a coil winding. The magnetic core (which may be ferrite or other magnetic material) provides high permeability to concentrate and guide magnetic flux, while the coil provides the electromagnetic coupling. This composite approach enables the antenna to achieve high radiation efficiency through enhanced magnetic flux density within the core, eliminating the need for large loop areas while maintaining or improving performance.
2Ease of manufacture
If a planar loop antenna is used, then the manufacturing is simple, but the radiation efficiency is insufficient without increasing area
Solution Approach 1:
The patent segments the antenna structure into distinct functional components: a magnetic core and a coil winding. The core can be separately manufactured using standard magnetic material fabrication processes, while the coil is wound around it. This segmentation allows each component to be optimized independently - the core for magnetic properties and the coil for electrical connectivity - while maintaining manufacturing simplicity through modular assembly on the substrate.
Solution Approach 2:
The magnetic core acts as an intermediary between the coil and the external magnetic field. It mediates the magnetic flux by concentrating and directing it through its high-permeability material, thereby enhancing the coupling between the coil and the surrounding electromagnetic environment. This intermediary function allows the antenna to achieve high radiation efficiency without requiring a large planar loop structure, resolving the contradiction between manufacturing simplicity and radiation performance.
3Reliability
If additional mounting structures are used, then the mounting reliability is improved, but the overall device size increases
Solution Approach 1:
The patent merges the antenna structure with the substrate mounting surface. The magnetic core and coil assembly is directly mounted on the substrate without requiring separate mounting brackets, fasteners, or additional support structures. The base of the magnetic core serves as the mounting interface, integrating the antenna function with the mounting function into a single compact unit. This merging eliminates redundant components and reduces overall device volume while maintaining secure mounting through direct attachment to the substrate.
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 configuration enhances magnetic flux efficiency, reduces eddy current loss, and allows for miniaturization of the NFC antenna, enabling it to be directly mounted on a substrate without additional mounting structures, thus saving space and improving reliability.
Implementation Method 1
a coil portion (200) wound around the core member (100)
Implementation Method 2
core member (100) having a support part (110), a plurality of first protrusion portions (120) disposed on one surface of the support part (110), and a plurality of second protrusion portions (130) disposed on the other surface of the support part (110), opposite to one surface of the support part (110)
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An antenna apparatus including a core member having a support part and first protrusion portions disposed on one surface of the support part, and a coil portion wound around the core member, wherein the core member further includes second protrusion portions disposed on the other surface of the support part, opposite to one surface of the support part, and the second protrusion portions have end surfaces provided as mounting surfaces, respectively.