IC Card Antenna Coil Layout for Stronger Magnetic Coupling
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Solution Overview
Problem
The existing antenna device configurations, such as those described in U.S. Patent Publication No. 2015/0235122, fail to provide sufficient magnetic coupling between the coupler coil and the module antenna of a chip module.
Innovation Solution
The antenna device includes a magnetic body with a through hole and a coil pattern comprising a first winding part wound along the outer edge of the magnetic body and a second winding part connected to the first winding part, wound in a direction opposite to the first winding part, and overlapping the through hole of the magnetic body. The second winding part has an inner peripheral side part wound along the inner peripheral edges of the through hole and an outer peripheral side part wound along the second, third, and fourth inner peripheral edges without being along the first inner peripheral edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupler coil is wound in a plurality of turns in a direction opposite to the booster antenna, then magnetic coupling between the coupler coil and module antenna is improved, but magnetic field cancellation occurs reducing inductance
Solution Approach 1:
The coil pattern is divided into two distinct winding parts: a first winding part wound along the outer edge of the magnetic body, and a second winding part wound in the opposite direction overlapping the through hole. This segmentation allows each part to serve different functions - the first part provides inductance while the second part enhances magnetic coupling without causing complete field cancellation.
Solution Approach 2:
Different regions of the coil pattern have different winding directions and positions. The first winding part is positioned at the outer edge with one winding direction, while the second winding part is positioned over the through hole with the opposite winding direction. This local differentiation optimizes both inductance generation and magnetic coupling simultaneously.
2Reliability
If the second winding part is wound along all inner peripheral edges of the through hole, then magnetic coupling is maximized, but magnetic field cancellation increases reducing inductance
Solution Approach 1:
The second winding part is extracted from winding along the first inner peripheral edge, which is the edge closest to the first winding part. By excluding this specific edge, the design prevents direct opposition between windings that would cause field cancellation, while still maintaining effective magnetic coupling through the through hole via the other edges.
Solution Approach 2:
Instead of winding the second part in the same direction as the first part (which would maintain inductance but reduce coupling), the invention winds it in the opposite direction. However, by strategically excluding the first inner peripheral edge, it inverts the approach to prevent harmful cancellation while preserving beneficial coupling effects.
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 enhances magnetic coupling between the second winding part and the IC module, improving communication characteristics by preventing magnetic field cancellation and increasing inductance.
Implementation Method 1
The coil pattern includes a first winding part wound in a plurality of turns along the outer edge of the magnetic body and a second winding part connected to respective turns of the first winding part and wound in a plurality of turns in a direction opposite to the winding direction of the first winding part
Data Source
AI summary
Disclosed herein is an antenna device that includes a magnetic body having a through hole, and a coil pattern including a first winding part and a second winding part overlapping the through hole of the magnetic body. The through hole of the magnetic body includes first and third inner peripheral edges each including a section extending in a first direction and positioned opposite to each other and second and fourth inner peripheral edges each including a section extending in a second direction perpendicular to the first direction and positioned opposite to each other. The second winding part includes an inner peripheral side part wound along the first to fourth inner peripheral edges and an outer peripheral side part positioned outside the inner peripheral side part and wound along the second to fourth inner peripheral edges without being along the first inner peripheral edge.