Overlapping NFC Coil Layout for Compact Long-Range Antennas
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Solution Overview
Problem
Existing NFC antenna configurations require significant space and numerous components due to the placement of a booster antenna, which increases the size and complexity of the system.
Innovation Solution
An antenna device with a substrate featuring a first coil pattern and a second coil pattern, where the first coil pattern is smaller in area and overlaps the second coil pattern, connected to a capacitor to form a closed circuit, reducing space requirements and component count, while optimizing the coupling coefficient and resonant frequencies to extend communication distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a booster antenna is disposed spaced by about 6 mm from the RFIC reader/writer, then wireless communication distance is extended, but the space requirement increases significantly
Solution Approach 1:
The patent merges the booster antenna and capacitor into a single integrated component structure. The coil pattern of the booster antenna is formed in direct contact with the capacitor, eliminating the need for separate mounting and connection structures. This integration reduces the overall space occupation while maintaining the extended communication distance functionality.
Solution Approach 2:
The capacitor is positioned within the opening region of the coil pattern, creating a nested configuration where one component is placed inside the spatial envelope of the other. This nesting arrangement minimizes the total area occupied by the antenna assembly while preserving the electromagnetic coupling necessary for extended communication range.
2Reliability
If a coil pattern is connected with a capacitor using separate components, then the circuit functionality is achieved, but the number of constituent components increases
Solution Approach 1:
The booster antenna and capacitor are merged into a single integrated component where the coil pattern is formed in direct contact with the capacitor terminals. This eliminates the need for separate mounting brackets, connection wires, and assembly steps, reducing the component count from multiple discrete parts to a single integrated unit while maintaining complete circuit functionality.
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 solution achieves a reduced space requirement and component count, enabling a larger communication distance with optimized coupling and resonant frequency settings, resulting in a compact and efficient NFC antenna module.
Implementation Method 1
a first coil pattern, a second coil pattern, and a first capacitor which are provided on a surface of the substrate... One of the first and second coil patterns is connected to the first capacitor to constitute a closed circuit
Implementation Method 2
One of the first and second coil patterns is connected to the first capacitor to constitute a closed circuit
Data Source
AI summary
Disclosed herein is an antenna device that includes a substrate; and a first coil pattern, a second coil pattern, and a first capacitor which are provided on a surface of the substrate. An opening region of the first coil pattern is smaller in area than an opening region of the second coil pattern. The first coil pattern is disposed so as to overlap the opening region of the second coil pattern. One of the first and second coil patterns is connected to the first capacitor to constitute a closed circuit.