Antenna Module Ferrite Sheet Substrate Elimination
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Solution Overview
Problem
Conventional NFC and wireless charging antenna modules, formed with a flexible printed circuit board and ferrite sheet, result in increased thickness of portable terminals due to the substrate thickness, which is not ideal for compact designs.
Innovation Solution
The solution involves directly forming first and second pattern portions on both surfaces of a ferrite sheet and electrically connecting them via a connection member, eliminating the need for a substrate and allowing for adjustable thickness and width configurations of the plating layers to enhance radiation and charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible printed circuit board (FPCB) and ferrite sheet are bonded to form an antenna module, then the antenna module can be manufactured with standard NFC/wireless charging functionality, but the thickness of the portable terminal increases due to the FPCB substrate thickness
Solution Approach 1:
The invention extracts and removes the FPCB substrate from the antenna module structure. Instead of forming patterns on a separate FPCB substrate and bonding it to the ferrite sheet, the patterns are directly formed on the ferrite sheet surface, eliminating the need for the substrate and thereby reducing the overall thickness of the antenna module and portable terminal.
Solution Approach 2:
The invention merges the pattern formation process directly onto the ferrite sheet surface. The ferrite sheet serves dual purposes: as the magnetic material for NFC/wireless charging functionality and as the substrate for forming the conductive patterns, eliminating the need for a separate FPCB layer and reducing overall module thickness.
2Length of stationary object
If pattern portions are directly formed on the ferrite sheet without a substrate, then the thickness of the antenna module is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The invention changes the manufacturing parameters by directly forming patterns on the ferrite sheet surface using plating processes. Instead of manufacturing patterns on a flexible substrate and then bonding, the process parameters are adjusted to enable direct pattern formation on the rigid ferrite surface, which simplifies the overall structure even if the surface treatment process is more specialized.
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 reduces the overall thickness of the antenna module and portable terminal while increasing radiation and charging efficiency by optimizing the thickness and width of the pattern portions through plating layer adjustments.
Implementation Method 1
a via hole formed to pass through the magnetic body portion and provided therein with a connection member formed to electrically connect the first pattern portion and the second pattern portion
Implementation Method 2
a first pattern portion directly formed on one surface of the magnetic body portion and made by stacking a first pattern and a first plating layer; a second pattern portion directly formed on the other surface of the magnetic body portion and made by stacking a second pattern and a second plating layer
Data Source
AI summary
An antenna module includes a magnetic body portion made of a ferrite sheet, a first pattern portion directly formed on one surface of the magnetic body portion and including a first pattern and a first plating layer stacked thereon, a second pattern portion directly formed on the other surface of the magnetic body portion and including a second pattern and a second plating layer stacked thereon, and a via hole formed through the magnetic body portion and having a connection member for electrically connecting the first pattern portion and the second pattern portion formed therein. The first pattern portion and the second pattern portion are formed directly on the magnetic body portion without a substrate portion. Thus, the thickness is reduced by the amount of the thickness of the substrate portion.