Metal Back Cover with Patterned Portions for Antenna Eddy Current Reduction
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Solution Overview
Problem
Metal back covers in portable terminals induce eddy currents due to their conductivity, interfering with antenna functions, particularly during wireless power transmission charging.
Innovation Solution
A metal back cover with patterned portions that reduce eddy currents, including linear shapes, through holes, and a mesh body with insulated threads, allowing antennas to operate effectively without increasing the device's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal back cover is used for aesthetics and durability, then rigidity and durability are improved, but eddy current is induced by the magnetic field from the antenna, causing the antenna to malfunction
Solution Approach 1:
The back cover is segmented by forming pattern portions (through holes or recesses) that divide the continuous metal surface into separate regions. This segmentation interrupts the eddy current paths while preserving the overall structural integrity and rigidity of the metal back cover, allowing the antenna to function properly without compromising durability.
2Length of stationary object
If the antenna module is integrated into the back cover, then the overall thickness is reduced, but the eddy current problem persists
Solution Approach 1:
The back cover is segmented by forming pattern portions (through holes or recesses) that divide the continuous metal surface into separate regions. This segmentation interrupts the eddy current paths while preserving the overall structural integrity and rigidity of the metal back cover, allowing the antenna to function properly without compromising durability.
Solution Approach 2:
The antenna module is nested within the back cover structure through integration, where the back cover serves dual functions as both a protective shell and an antenna support structure. This nesting approach reduces overall device thickness while the pattern portions ensure antenna functionality is maintained.
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
Enables the successful operation of antennas even with a metal back cover, enhancing wireless charging efficiency and implementing thinning by integrating the antenna module without thickness increase.
Implementation Method 1
since the metal has conductivity due to a characteristic thereof and thus an eddy current is induced by a magnetic field generated from an antenna
Implementation Method 2
by transmitting the power using a magnetic field generated by a transmission coil and a reception coil
Data Source
AI summary
Provided are a back cover for a portable terminal and a back cover-integrated antenna module including the same. A back cover for a portable terminal according to an embodiment of the present invention is disposed on the back surface of a portable terminal body, and includes a pattern portion, which is formed to pass through the back cover formed of a metal material at a region corresponding to at least one antenna and configured to reduce generation of an eddy current.