NFC Antenna Module With Overlapping Radiation Sheet
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Solution Overview
Problem
Conventional NFC antenna modules in portable terminals suffer from weak signal reception and reduced recognition distance due to their differential antenna design, which limits their performance in reader mode.
Innovation Solution
An NFC antenna module is designed with an electromagnetic shielding sheet and a radiation sheet stacked on an antenna sheet, where the radiation sheet overlaps the antenna pattern, forming protrusions and slots to enhance radiation and reduce the area of the radiation sheet, thereby increasing antenna performance and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a differential antenna type-NFC antenna module is used, then the device complexity is reduced, but the signal reception strength deteriorates and recognition distance is shortened
Solution Approach 1:
The patent introduces a radiation sheet stacked on the antenna sheet, creating a multi-layer structure that extends the radiation capability into a new dimensional space. This allows the radiation pattern to be enhanced without complicating the basic differential antenna structure, thereby improving signal reception strength while maintaining device complexity at an acceptable level.
Solution Approach 2:
The patent combines the antenna sheet with a radiation sheet to form a composite antenna structure. This composite structure integrates the signal transmission function of the antenna sheet with the radiation enhancement function of the radiation sheet, achieving improved reception performance without significantly increasing device complexity.
2Reliability
If the radiation sheet area is increased to overlap more of the radiation pattern, then antenna performance is maximized, but the manufacturing cost increases
Solution Approach 1:
The radiation sheet features a depression at its center, creating local variations in the sheet's structure. This allows the radiation sheet to overlap with critical portions of the radiation pattern (the left, right, and lower patterns) while reducing material usage in the central area where overlap is less critical, thereby maintaining antenna performance while reducing manufacturing cost.
Solution Approach 2:
The radiation sheet is segmented into different regions: protrusions that overlap with side patterns and a depressed central area. This segmentation allows optimized overlap placement to enhance antenna performance while reducing the total area of the radiation sheet, thus lowering manufacturing costs.
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 maximizes antenna performance by increasing the radiation area and reduces the unit cost through strategic design features like slots and protrusions on the radiation sheet, improving signal reception and recognition distance.
Implementation Method 1
an electromagnetic shielding sheet; an antenna sheet in which a radiation pattern is formed along a peripheral surface of a central part, the antenna sheet being stacked on the electromagnetic shielding sheet
Implementation Method 2
a radiation sheet stacked on the antenna sheet to form an area that overlaps the radiation pattern, the radiation sheet having a depression formed to expose the central part
Data Source
AI summary
Disclosed are a NFC antenna module which maximizes antenna performance by mounting a radiation sheet in such a manner as to partially overlap with an antenna sheet and a portable terminal comprising the same. The disclosed NFC antenna module comprises: an electromagnetic wave shielding sheet; an antenna sheet laminated on the electromagnetic wave shielding sheet and having a radiation pattern formed along the outer periphery of a central portion thereof; and a radiation sheet laminated on the antenna sheet so as to form an overlapping area with the radiation pattern and having a recess formed therein, through which the central portion is exposed.