3D Bent NFC Antenna for Flexible Positioning
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Solution Overview
Problem
Existing NFC devices face challenges in reliably coupling their antennas due to limited space, particularly in vehicles where co-planar placement is not feasible, hindering efficient NFC communication.
Innovation Solution
The NFC device antenna features a wire loop shaped in a three-dimensional form, allowing the magnetic field to penetrate from different orientations, enabling reliable coupling with multiple NFC devices regardless of their positioning, and is integrated into various forms such as storage containers or bracelets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two NFC devices are placed in close proximity with co-planar antennas for reliable coupling, then NFC communication reliability is improved, but the required space and positioning flexibility deteriorate
Solution Approach 1:
The patent transitions from a two-dimensional co-planar antenna arrangement to a three-dimensional configuration where the first antenna is bent along a longitudinal axis to form a U-shape. This dimensional change allows the antennas to couple effectively without requiring co-planar placement, thereby improving positioning flexibility while maintaining coupling reliability.
Solution Approach 2:
The first antenna is bent into a curved U-shape configuration along the longitudinal axis, creating a three-dimensional loop structure. This curvature enables the antenna to generate a magnetic field that effectively penetrates the second antenna regardless of the exact positioning, resolving the contradiction between reliability and positioning flexibility.
2Ease of manufacture
If a flat wire loop antenna is used for NFC communication, then manufacturing simplicity is improved, but coupling reliability in limited space deteriorates
Solution Approach 1:
The patent bends the flat wire loop into a three-dimensional U-shape configuration, transforming it from a two-dimensional planar structure to a 3D spatial structure. This maintains the simplicity of using a continuous wire while improving coupling reliability in limited spaces by enabling the antenna to adapt to different positioning scenarios.
3Adaptability or versatility
If the wire loop is bent into a three-dimensional U-shape, then positioning flexibility and coupling reliability are improved, but manufacturing complexity increases
Solution Approach 1:
The antenna is bent into a simple U-shape configuration with a single longitudinal axis of curvature, rather than complex multi-axial bending. This maintains positioning flexibility while minimizing manufacturing complexity by using a straightforward bend geometry that can be easily formed during PCB trace fabrication or wire wrapping.
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 design provides a multidimensional operating volume, allowing flexible positioning of NFC devices and maintaining effective coupling, enabling simultaneous communication with multiple devices without the need for co-planar alignment.
Implementation Method 1
The wire loop functions as a reader antenna that may generate an antenna near field such that the wire loop is electro-magnetically coupled to another wire loop of the antenna of a second NFC device. By coupling the wire loop of the NFC reader with the wire loop of the second NFC device the near field generates an electric voltage in the wire loop of the second NFC device according to the principle of the transformer.
Implementation Method 2
by providing an electric current in the wire, a magnetic near field may be provided, that is a magnetic field that is generated by the current flowing through the wire. On the other hand, by changing the magnetic flux that penetrates the loop area, an electric voltage is induced in the wire according to the law of induction.
Data Source
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AI summary
The invention is concerned with an antenna (11) for an NFC device (10), the antenna (11) comprising at least one wire loop (15) of a wire (14), wherein each wire loop (15) delimits a loop area (16) such that an electric current (13) and/or an electric voltage in the wire (14) is coupled to a magnetic flux (26) that penetrates the loop area (16). The invention is characterized in that the respective loop area (16) of the at least one wire loop (15) is bent or folded around a volume (17).