Dual-Ferrite Coil Antenna Layout for Narrow NFC Openings
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Solution Overview
Problem
Conventional antenna systems for near-field communication (NFC) and wireless power transfer face limitations due to the need for identical antenna structures and stringent housing conditions, which restrict interoperability and magnetic flux, especially in devices with narrow antenna openings.
Innovation Solution
An antenna system comprising a first and second ferrite element with coils wrapped around them, connected by a conductor network, allowing for the emission of RF fields in various configurations to achieve a high coupling factor and sufficient magnetic flux, enabling efficient NFC-based communications and wireless charging across different devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antenna systems use identical antenna structures and stringent housing conditions, then NFC-based communications and wireless charging can be enabled, but interoperability is limited and magnetic flux is restricted
Solution Approach 1:
The antenna system is divided into two separate coils (first coil and second coil) with different structures, each wrapped around its own ferrite element. This segmentation allows each coil to be optimized for different antenna types while working together to achieve the desired magnetic flux and coupling factor for NFC communications
Solution Approach 2:
The patent creates a universal antenna system that can interface with multiple types of receiving antennas (loop antennas, single coil-ferrite rod antennas, multiple coil-ferrite rod antennas, 8-shaped coil antennas, and triple loop-shaped coil antennas) through the dual-coil configuration, enabling broad interoperability across different device types
2Reliability
If conventional antenna systems use identical antenna structures, then NFC-based communications can be enabled, but magnetic flux is insufficient in devices with narrow antenna openings
Solution Approach 1:
The patent merges the functionality of two different coil structures into a single antenna system. The first and second coils are electrically connected through a conductor network, combining their magnetic field generation capabilities to produce sufficient magnetic flux even in devices with narrow antenna openings where single-coil designs would fail
3Reliability
If conventional antenna systems use stringent housing conditions, then NFC-based communications can be enabled, but device complexity increases
Solution Approach 1:
The patent applies local quality by giving each coil different structural characteristics optimized for its specific function. The first coil and second coil have different configurations, and each is paired with its own ferrite element, allowing localized optimization without requiring complex housing conditions throughout the entire device
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 proposed antenna system enhances interoperability and expands application to a broader range of devices by achieving a high coupling factor and sufficient magnetic flux, overcoming structural constraints and enabling efficient NFC-based communications and wireless charging.
Implementation Method 1
a first radio frequency (RF) field is produced by a first current provided to the first coil, and a second RF field is produced by a second current provided to the second coil
Implementation Method 2
a first ferrite element, a second ferrite element, a first coil wrapped around the first ferrite element, a second coil wrapped around the second ferrite element
Data Source
Figure 1A~1B
Figure 1C
Figure 2A~2B
AI summary
Embodiments of an antenna system and a method for operating an antenna are disclosed. In an embodiment, an antenna system includes a first ferrite element, a second ferrite element, a first coil wrapped around the first ferrite element, a second coil wrapped around the second ferrite element, a first antenna interface electrically coupled to the first coil, a second antenna interface electrically coupled to the second coil, and a conductor network connected between the first coil, the second coil, the first antenna interface, and the second antenna interface.