Antenna Device Segmented Coils Compact Nfc
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Solution Overview
Problem
Existing antenna devices for near-field communication face challenges in reducing size while maintaining effective coupling with communication partners, and achieving a suitable coupling coefficient between feeder coils and coil antennas is difficult, leading to weakened communication performance and limited design flexibility.
Innovation Solution
The design includes a first and second coil antenna with winding axes not perpendicular to each other, a feeder coil with a winding axis perpendicular to the first coil antenna, and strategically positioned apertures to ensure magnetic flux alignment and strong coupling, allowing for efficient communication characteristics and a compact antenna device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single coil antenna of limited size is used, then the size of the antenna device is reduced, but adequate coupling with the communication partner cannot be realized
Solution Approach 1:
The antenna device is segmented into multiple coil antennas (first coil antenna and second coil antenna) with different winding axis directions. This segmentation allows each coil antenna to contribute to coupling in different spatial directions, achieving adequate overall coupling while maintaining a compact device size that would be insufficient for a single large coil antenna.
Solution Approach 2:
The invention introduces dimensional diversity by arranging coil antennas with winding axes in different directions (not perpendicular to each other). This spatial arrangement in multiple dimensions enhances the coupling capability without increasing the planar footprint, effectively utilizing three-dimensional space for improved magnetic field coupling.
2Adaptability or versatility
If the coupling coefficient between feeder coil and coil antenna is not suitably realized, then design flexibility is improved, but coupling between antenna devices is weakened
Solution Approach 1:
The invention optimizes the coupling coefficient by carefully controlling geometric parameters including the distance between the feeder coil and coil antennas, the relative orientations of winding axes, and the dimensions of coil apertures. These parameter adjustments enable suitable coupling coefficients to be achieved while maintaining design flexibility for different application requirements.
Solution Approach 2:
The invention uses multiple coil antennas with similar structures but different spatial orientations. By copying the coil antenna design and arranging them in specific configurations, the system achieves reliable coupling through combined magnetic field contributions while preserving design flexibility for various form factors and applications.
3Reliability
If coil antennas are arranged with perpendicular winding axes, then coupling is maximized, but design freedom is reduced
Solution Approach 1:
The invention adopts a dynamic design approach where the winding axis directions of multiple coil antennas are configured to be non-perpendicular, allowing optimization of coupling coefficients while adapting to different device form factors and application requirements. This flexible angular arrangement provides design freedom unlike fixed perpendicular configurations.
Solution Approach 2:
The invention applies local quality optimization by configuring each coil antenna with specific winding axis directions and aperture positions tailored to its spatial location. This allows each coil antenna to contribute optimally to coupling in its local region while maintaining overall design flexibility for the complete antenna 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
This configuration enhances communication efficiency by ensuring strong coupling between the feeder coil and both coil antennas, enabling a small-size antenna device with improved radiating efficiency and flexibility in design.
Implementation Method 1
a feeder coil with a winding axis that extends in a direction perpendicular or substantially perpendicular to the winding axis of the first coil antenna, including a first coil aperture and a second coil aperture, and being located between the first coil antenna and the second coil antenna
Implementation Method 2
a first coil antenna and a second coil antenna, winding axis directions of which are not perpendicular each other
Data Source
AI summary
An antenna device includes first and second coil antennas with winding axis directions that are not perpendicular to each other, and a feeder coil including a winding axis that extends perpendicular or substantially perpendicular to the winding axis of the first coil antenna. The feeder coil is located between the first and second coil antennas in the winding axis direction thereof. A first coil aperture is closer to a coil aperture of the first coil antenna than a second coil aperture. The second coil aperture is closer to a coil aperture of the second coil antenna than the first coil aperture. The first and second coil antennas are connected to each other in a polarity such that magnetic fluxes thereof with respect to the winding axis direction of the first coil antenna are in phase with each other.