IC Card Antenna Coil Layout for Stronger Module Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna devices face insufficient coupling to IC modules due to positioning of the coupling portion at the end of the coil pattern's line length, which is exacerbated by increasing the number of turns to reduce self-resonance frequency.
Innovation Solution
The antenna device features a first coil pattern with a second winding part positioned closer to the center of the line length, incorporating a second partial winding part that serves as a coupling coil, allowing for increased current density and improved coupling even when the self-resonance frequency is reduced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of turns of the coil pattern is increased to reduce the self-resonance frequency, then the self-resonance frequency is reduced, but the coupling portion between the IC module and the coil pattern is positioned closer to the end of the line length, thus further reducing the coupling
Solution Approach 1:
The coil pattern is divided into multiple winding parts (first, second, and third winding parts) with different functions. The second winding part is specifically designed as a coupling portion with a unique structure including first and second partial winding parts, separating the coupling function from the general antenna function to improve coupling without increasing total turns
Solution Approach 2:
The second winding part is positioned at a specific location (not at the end of line length) and given a special structure where the second partial winding part protrudes radially outward. This local optimization ensures strong coupling to the IC module without requiring increased overall complexity
2Device complexity
If the coupling portion is positioned at the end of the line length of the coil pattern, then the structure is simplified, but the coupling to the IC module is insufficient
Solution Approach 1:
Instead of positioning the coupling portion at the end of line length, the second winding part is positioned at an intermediate location with a specific structure. The second partial winding part protrudes radially outward to enhance coupling, optimizing local coupling quality without compromising overall structural simplicity
Solution Approach 2:
The second partial winding part protrudes radially outward from the first partial winding part, adding a dimensional aspect to the coupling structure. This radial protrusion creates better spatial overlap with the IC module, enhancing coupling without increasing planar complexity
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 sufficient coupling to IC modules while reducing self-resonance frequency, maintaining high coupling performance and transparency in the IC card design.
Implementation Method 1
the second partial winding part of the second winding part is used as a coupling coil
Implementation Method 2
an antenna device includes a substrate and a first coil pattern provided on one surface of the substrate
Data Source
AI summary
Disclosed herein is an antenna device that includes a coil pattern having first to third winding parts each having a plurality of turns. The first winding part has an outer peripheral end being opened and an inner peripheral end connected to an outer peripheral end of the second winding part. The second winding part has an inner peripheral end connected to an outer peripheral end of the third winding part. The third winding part has an inner peripheral end being opened. Each turn of the second winding part has a first partial winding part wound concentrically with the third winding part and a second partial winding part protruding radially outward from the first partial winding part and wound about a center axis positioned between the first partial winding part and the first winding part.