NFC Antenna Module With Segmented Guide Patterns
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Solution Overview
Problem
Existing NFC antenna patterns face challenges in achieving desired frequency specifications due to narrow frequency bandwidth and inadequate ferrite distribution, which affects the antenna's performance and characteristics.
Innovation Solution
The design incorporates a loop pattern with guide patterns that form holes, allowing for improved ferrite distribution and adjustment of the LCR value by strategically placing and sizing these holes to optimize frequency bandwidth, with the holes being punched in a non-overlapping manner on a ferrite sheet to prevent radio wave interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional NFC antenna pattern is used, then the antenna structure is simple, but the frequency bandwidth is narrow and ferrite distribution is inadequate
Solution Approach 1:
The antenna pattern is divided into multiple guide patterns (first guide pattern, second guide pattern, third guide pattern, etc.) arranged in sequence. Each guide pattern contains holes that segment the ferrite sheet into distinct regions, improving ferrite distribution across the antenna structure while maintaining a manageable overall design
Solution Approach 2:
Different regions of the antenna pattern are assigned different functions: the guide patterns are specifically designed to control ferrite distribution in certain areas, while other regions maintain conventional structures. The holes in the guide patterns create localized ferrite regions that optimize frequency bandwidth without requiring complete redesign of the entire antenna
2Manufacturing precision
If the antenna pattern is modified to improve ferrite distribution, then frequency specifications are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The guide patterns with holes are designed and positioned in advance during the pattern formation process. The holes are strategically placed in the guide patterns before the antenna is assembled, allowing ferrite to be distributed correctly from the beginning. This preliminary arrangement of ferrite-containing structures simplifies subsequent manufacturing steps compared to attempting to adjust ferrite distribution after assembly
Solution Approach 2:
The design incorporates multiple layers and dimensions: the antenna pattern exists in a planar dimension, while the holes in the guide patterns create vertical dimensionality by allowing ferrite sheet to protrude or be positioned at different heights. This multi-dimensional approach enables precise ferrite distribution control without requiring complex three-dimensional manufacturing processes
3Adaptability or versatility
If holes are formed in guide patterns to optimize ferrite distribution, then frequency bandwidth is improved, but the risk of hole overlap increases
Solution Approach 1:
The guide patterns are designed with asymmetric hole arrangements rather than uniform symmetric patterns. Each guide pattern contains holes at specific asymmetric positions that are calculated to prevent overlap while optimizing ferrite distribution. The asymmetry allows greater flexibility in positioning holes to achieve desired frequency characteristics without the constraints of symmetric repetition
Solution Approach 2:
Rather than forming holes in all guide patterns uniformly, the design selectively forms holes in specific guide patterns (first, second, third, etc.) based on their positions and the desired ferrite distribution. This partial action approach ensures that holes are placed only where they will effectively improve frequency bandwidth without creating overlaps, rather than applying a blanket hole-forming rule to all patterns
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 approach enhances ferrite distribution, adjusts the LCR value, and improves the yield of the antenna manufacturing process, enabling better frequency specifications and performance in NFC applications.
Implementation Method 1
the ferrite sheet (not shown) blocks radio wave interference between the radiation pattern 10 and a printed circuit board (not shown) of a terminal device
Data Source
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AI summary
Disclosed are an antenna module for a terminal device and a method for manufacturing the same. The antenna module for the terminal device includes a radiation pattern configured to include a loop pattern. In the antenna module, a plurality of guide patterns for forming one or more holes on the loop pattern are formed in the loop pattern. As one or more holes are formed in one or more among the plurality of guide patterns, the one or more holes are formed on the loop pattern. Accordingly, it is possible to improve ferrite distribution as a factor having influence on a frequency bandwidth and to adjust an LCR value in a pattern process. Further, it is possible to improve the yield of an antenna manufacturing process.