Flexible Antenna Module With Inserted Magnetic Sheet
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Solution Overview
Problem
Miniaturization and thinning of portable terminals lead to challenges in manufacturing MST antenna modules due to coil short occurrences, irregular windings, and distortion, while simultaneously mounting multiple antennas becomes insufficient, necessitating an integrated solution for NFC and MST antennas.
Innovation Solution
An antenna module is developed with a magnetic sheet inserted into a flexible printed circuit board, forming radiation patterns for near field communication and electronic payment, which simplifies the manufacturing process, reduces resistance, and minimizes interference with geomagnetic sensors, allowing for enhanced performance and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If MST antenna module is miniaturized and thinned, then the size and thickness of portable terminal are reduced, but the inferiority rate is increased due to coil short occurrence, irregular windings, and distortion
Solution Approach 1:
The patent replaces the traditional mechanical coil winding system with a printed circuit board-based radiation pattern system. The MST antenna is formed by printing conductive patterns on a flexible printed circuit board, eliminating the need for manual or automated coil winding processes. This substitution removes the sources of manufacturing defects (coil shorts, irregular windings, distortion) while enabling miniaturization and thinning of the antenna module.
2Adaptability or versatility
If multiple antennas are mounted simultaneously, then the functions of NFC and electronic payment are provided, but the mounting space becomes insufficient
Solution Approach 1:
The patent merges the NFC antenna and MST antenna into a single integrated structure. Both antenna types are formed on the same flexible printed circuit board, sharing the same substrate and mounting space. The radiation patterns for NFC and MST functions are printed on overlapping or adjacent areas of the FPCB, allowing dual functionality to be achieved within a compact footprint.
Solution Approach 2:
The flexible printed circuit board serves multiple functions simultaneously: it acts as the substrate for both NFC and MST antennas, provides electrical connections for both antenna types, and enables both near field communication and magnetic secure transmission functions. This multi-functionality reduces the overall mounting space required compared to separate antenna modules.
3Ease of manufacture
If magnetic sheet is inserted into FPCB, then the manufacturing process is simplified and performance is enhanced, but the influence on geomagnetic sensor must be minimized
Solution Approach 1:
The patent applies local quality by selectively positioning the magnetic sheet only in specific regions where it is needed for MST antenna performance enhancement. The magnetic sheet is inserted into the FPCB at locations corresponding to the MST radiation pattern areas, while avoiding regions near geomagnetic sensors. This localized placement maintains manufacturing simplicity and performance benefits while minimizing interference with sensor operations.
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 secures mounting space, simplifies the manufacturing process, enhances antenna performance, and maintains or exceeds the performance of existing modules while reducing the influence on geomagnetic sensors, enabling efficient electronic payment and near field communication.
Implementation Method 1
a magnetic sheet configured to be inserted into and to penetrate the slit, wherein a part of the magnetic sheet is disposed on a front side of the antenna sheet to overlap the radiation pattern, and a remaining part of the magnetic sheet is disposed on a rear side of the antenna sheet to overlap the radiation pattern
Data Source
AI summary
Provided is an antenna module which can minimize the resistance of a radiation pattern by forming the radiation pattern on both surfaces or on a single surface in accordance with a relative position to an insertion hole in which a magnetic sheet is inserted and whether to overlap the magnetic sheet. The provided antenna module includes a radiation pattern is formed on both surfaces of the flexible sheet at a part of regions and is formed on a single surface of the flexible sheet at a remaining part.