Embedded Coil Antenna Structure for Bidirectional IC Card Communication
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Solution Overview
Problem
Existing antenna devices with embedded coil patterns in magnetic bodies face difficulties in communicating with devices positioned on the opposite side of the coil pattern embedding, limiting their functionality.
Innovation Solution
The antenna device incorporates a magnetic body with a through hole and a coil pattern having a first and second winding part, where the second winding part protrudes towards the through hole and is wound in a direction opposite to the first winding part, allowing communication with devices on both sides by embedding the coil pattern partially within the magnetic body, which includes an insulating film and a resin layer for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil pattern is embedded in the surface of the magnetic body, then the antenna device can communicate with devices on the embedding side, but it has difficulty communicating with devices on the opposite side
Solution Approach 1:
The coil pattern is divided into two distinct winding parts: a first winding part embedded in the magnetic body for communication on one side, and a second winding part protruding from the magnetic body for communication on the opposite side. This segmentation enables bidirectional communication capability while maintaining the benefits of embedded coil structure.
Solution Approach 2:
The coil pattern transitions from a purely two-dimensional embedded structure to a three-dimensional configuration where the second winding part protrudes from the magnetic body surface. This dimensional change allows the antenna to interact with devices on both sides of the magnetic body, solving the unidirectional communication limitation.
2Adaptability or versatility
If the coil pattern is partially embedded in the magnetic body, then communication with devices on both sides is enabled, but the structure becomes more complex
Solution Approach 1:
The first and second winding parts are formed as a single integrated coil pattern structure, combining the embedded and protruding portions into one continuous conductive path. This merging approach reduces manufacturing complexity compared to using separate components, while still achieving bidirectional communication functionality.
3Length of stationary object
If the coil pattern is embedded in the magnetic body, then the thickness is reduced, but resistance and eddy current increase
Solution Approach 1:
Different portions of the coil pattern have different embedding depths: the first winding part is embedded in the magnetic body to reduce thickness and provide magnetic shielding, while the second winding part protrudes from the magnetic body to minimize resistance and eddy current losses. This local quality variation optimizes both thickness reduction and energy efficiency.
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 enables effective communication with devices on both sides of the magnetic body, improving the antenna's operational range and reducing resistance and eddy current, while maintaining a reduced thickness and preventing short-circuits.
Implementation Method 1
an external magnetic body that magnetically confines a magnetic flux generated by an internal coil pattern
Implementation Method 2
an internal coil pattern that is partially embedded in a surface of the magnetic body
Data Source
AI summary
Disclosed herein is an antenna device that includes a magnetic body having a through hole therein, and a coil pattern having upper and bottom surfaces positioned opposite to each other in a thickness direction thereof and a side surface connecting the upper and bottom surfaces. The coil pattern is partially embedded in the magnetic body such that the upper and side surfaces of the coil pattern are at least partially covered with the magnetic body. The coil pattern includes a first winding part and a second winding part protruding from the first winding part toward the through hole formed in the magnetic body in a plan view and wound in a direction opposite to the winding direction of the first winding part. The second winding part is wound along a periphery of the through hole formed in the magnetic body.