NFC Coil Module with Segmented Pattern for Flux Offset Reduction
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Solution Overview
Problem
Existing NFC coil designs face challenges in recognizing NFC tags with varying magnitudes due to offset magnetic flux between central and outer coils, leading to reduced recognition rates.
Innovation Solution
A coil module design featuring a first pattern portion connected to the input/output terminal unit, a second pattern portion traversing the internal area of the first pattern portion to divide it into two or more portions, and a third pattern portion connected to the second pattern portion, with a semicircular pattern in the central portion, and an inclined pattern to manage magnetic flux effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional circular patterns are connected to a central portion of the NFC patterns to improve recognition rate of NFC tags having various magnitudes, then the recognition rate is improved, but magnetic flux of a central coil and magnetic flux of an outer coil offset each other in a space between the central coil and the outer coil, such that recognition rate of NFC tags may be significantly reduced
Solution Approach 1:
The coil pattern is divided into multiple distinct portions (first pattern portion, second pattern portion, third pattern portion) with specific geometric configurations. The first pattern portion forms an outer coil, the second pattern portion forms a central coil, and the third pattern portion connects them, creating segmented magnetic flux paths that prevent complete offsetting and improve overall recognition performance.
2Productivity
If patterns occupying a wide area are used to improve card mode performance, then card mode performance is improved, but the problem in terms of recognizing NFC tags having various magnitudes occurs
Solution Approach 1:
Different portions of the coil pattern are designed with distinct geometric characteristics optimized for specific functions. The first pattern portion (outer coil) is optimized for card mode performance with wide area coverage, while the second pattern portion (central coil) is optimized for recognizing NFC tags of various magnitudes. The third pattern portion connects these regions, creating a structure that simultaneously achieves both performance goals through local optimization.
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 design enhances the recognition rate of NFC tags by optimizing magnetic flux distribution, reducing offset magnetic flux, and providing a wider recognition range.
Implementation Method 1
a coil for near field communications (NFC) formed on a surface of the board and connected to the input/output terminal unit
Data Source
AI summary
A coil module may include: a board; an input/output terminal unit formed on the board; and a coil for near field communications (NFC) disposed on one, or a plurality of, surface(s) of the board and connected to the input/output terminal unit, wherein the coil for NFC includes a first pattern portion having one end connected to the input/output terminal unit and disposed on the board to rotate or turn in one direction, a second pattern portion connected to the first pattern portion and traversing an internal area of the first pattern portion to divide the internal area of the first pattern portion into at least two portions, and a third pattern portion having one end connected to the second pattern portion and the other end connected to the input/output terminal unit.