Antenna Coil Segmentation for Magnetic Shielding in Mobile Devices
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Solution Overview
Problem
In mobile electronic devices, the positioning of antenna coils relative to metal plates is challenging due to multiple layers, which affects the magnetic shielding effect and communication efficiency, especially when the metal plates are at a distant position relative to the opposing antenna, leading to reduced antenna performance and larger device casings.
Innovation Solution
The antenna device incorporates an antenna coil bisected into one and another side section along an edge of a magnetic sheet attached to an inner wall surface of a metal body at a distant position, with additional magnetic sheets positioned to enhance magnetic shielding and communication efficiency by optimizing the positional relationship between the antenna coil and metal plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the antenna coil is positioned near the edge of a metal plate to utilize magnetic shielding effect, then communication efficiency is improved, but the device casing size increases
Solution Approach 1:
The antenna coil is divided into two distinct sections: a first section positioned near the edge of the metal plate to utilize magnetic shielding effect, and a second section positioned away from the edge to maintain compact device size. This segmentation allows each section to serve different functional purposes, resolving the contradiction between communication efficiency and compact size.
Solution Approach 2:
Different portions of the antenna coil are assigned different spatial positions relative to the metal plate. The first section is strategically placed near the metal plate edge where magnetic shielding effect is strongest, while the second section is positioned in a different location. This local differentiation optimizes communication efficiency in critical areas without requiring the entire antenna to occupy large space.
2Strength
If multiple layers of metal plates are used in the device structure, then structural integrity is improved, but the magnetic shielding effect is reduced due to distant layer influence
Solution Approach 1:
The antenna coil is segmented into sections that differentially interact with multiple metal plate layers. The first section is positioned to primarily interact with the first metal plate, while the second section interacts with the second metal plate at a different position. This segmentation allows the system to maintain structural integrity through multiple layers while preserving antenna performance by establishing effective magnetic coupling with at least one layer.
Solution Approach 2:
The divided antenna coil sections act as intermediaries between the reader/writer and the multiple metal plate layers. By positioning different sections at different depths or locations relative to the metal layers, the antenna system can effectively penetrate or interact with the metal structure, maintaining communication capability despite the presence of multiple shielding layers.
3Stability of the object's composition
If the loop antenna is positioned in the central portion of the device, then structural symmetry is maintained, but magnetic field reception efficiency is poor
Solution Approach 1:
The antenna coil is deliberately positioned asymmetrically relative to the metal plate, with the first section located near the metal plate edge and the second section at a different position. This asymmetric arrangement breaks the structural symmetry but significantly improves magnetic field reception efficiency by placing the antenna in regions where magnetic flux density is higher, particularly near the edges of metal plates where eddy current effects create favorable magnetic field distributions.
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 configuration maintains antenna performance and enables more stable communication while allowing for a smaller device casing, effectively utilizing the magnetic shielding effect of metal plates regardless of their positional relationship with the opposing antenna.
Implementation Method 1
This antenna module communicates by making use of inductive coupling to an antenna coil incorporated into a transmitter, such as a reader/writer
Implementation Method 2
metal such as a substrate in the apparatus, a battery pack, or the like receives the magnetic field from a reader/writer, thereby generating eddy current that repels the magnetic flux from the reader/writer
Implementation Method 3
an antenna device that uses a magnetic sheet to increase magnetic flux and enhance performance
Data Source
AI summary
An antenna device and an electronic apparatus are provided that enable a smaller casing and more stable communication by effectively using a magnetic shielding effect of a metal plate, regardless of internal structure or relationship of other components in a mobile apparatus. Included therein is an antenna coil (12) bisected into one side section and another side section of a loop antenna (11) along an edge of a magnetic sheet (110) attached to an inner wall surface of a metal body (111) disposed at a distant position relative to an antenna (121) of an opposing external device. The one side section of the loop antenna (11) opposes the magnetic sheet (110) and the other side section of the loop antenna (11) opposes the metal body (111) disposed at the distant position.