Antenna Coil with Conductor Opening for Magnetic Coupling
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Solution Overview
Problem
Conventional antenna modules in portable electronic devices face challenges in securing high communication performance due to structural limitations that can shield parts of the antenna coil, leading to inadequate magnetic field coupling with external devices.
Innovation Solution
The antenna device incorporates an antenna coil wound around a conducting wire with opposing sides and a sheet-like conductor having a conductor side opening and slit, allowing for adjustment of the operation point to peak coupling coefficient by overlapping the conductor side opening with the antenna coil and connecting it to the outer edge of the sheet-like conductor, enhancing magnetic flux collection and communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna coil is arranged at an end of a metal plate to improve communication efficiency, then magnetic field coupling is improved, but the operation point cannot be adjusted to peak coupling coefficient due to structural limitations
Solution Approach 1:
The antenna coil is divided into two parts: one side part where conducting wire is wound in one direction and other side part where conducting wire is wound in other direction, separated by a center line. This segmentation allows selective overlap with the conductor side opening to optimize coupling coefficient while maintaining structural integrity
Solution Approach 2:
The sheet-like conductor is provided with a conductor side opening that overlaps only with the other side part of the antenna coil, and a slit is formed between the conductor side opening and outer edge. This local modification creates optimal magnetic flux distribution at the peak coupling coefficient position without affecting other areas
2Ease of manufacture
If a sheet-like conductor is provided to bridge substrate and antenna coil when layout limitations prevent close arrangement, then structural flexibility is improved, but communication performance may be insufficient without proper positioning
Solution Approach 1:
A sheet-like conductor acts as an intermediary element between the substrate and antenna coil, providing a bridge that enables proper magnetic flux coupling even when direct close arrangement is not possible due to layout constraints. The conductor side opening and slit configuration optimizes this intermediary function
Solution Approach 2:
The solution moves from two-dimensional planar arrangement constraints to three-dimensional spatial configuration by using a sheet-like conductor with vertical extension, allowing the antenna coil to be positioned away from the substrate while maintaining effective coupling through the conductor opening
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 ensures higher communication performance by optimizing the magnetic field coupling between the antenna device and external devices, improving communication efficiency and overcoming structural limitations that previously hindered performance.
Implementation Method 1
an antenna coil inductively coupled to the external device... magnetic field from the reader/writer is received by an antenna coil and thereby converted into electric power
Implementation Method 2
the sheet-like conductor is configured to be provided with a conductor side opening overlapped only with the other side part of the antenna coil, and a slit formed between the conductor side opening and any outer edge of the sheet-like conductor
Implementation Method 3
magnetic flux from the reader/writer are caused to bounce back by eddy current occurring because a metal plate such as a battery pack or a substrate inside the apparatus receives a magnetic field from the reader/writer
Data Source
AI summary
An antenna device incorporated in an electronic apparatus and communicating with an external device via an electromagnetic field signal, including: an antenna coil inductively coupled to the external device and provided by winding around a conducting wire so conducting wires opposing in width direction via an opening will be close together; and a sheet-like conductor at a surface of the antenna coil opposite a surface of the antenna coil opposing the external device, wherein the coil is divided into two parts, i.e. one side part wherein the conducting wire is wound around in one direction and other side part wound in other direction, via a center line longitudinally traversing the opening, and the conductor is configured with a conductor side opening overlapped only with the other side part of the antenna coil, and a slit formed between the conductor side opening and any outer edge of the sheet-like conductor.