NFC Antenna Coil Pattern Series Loop Design
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Solution Overview
Problem
Existing NFC antenna devices for mobile wireless devices have limited communication distance and increased planar size due to their configuration, where only one loop antenna is formed by the radiation conductor and ground pattern, and the radiation conductor is positioned differently from the ground pattern.
Innovation Solution
The antenna device incorporates a coil pattern connected in series with the loop antenna, using a solenoid or meander coil configuration, with wiring patterns and metal layers to form a larger loop antenna, allowing for extended communication distance and reduced planar size, and includes a circuit substrate and inductance elements to separate signal components and enhance antenna characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one loop antenna is constituted by the radiation conductor and ground pattern, then the antenna device can be simple in structure, but the communication distance becomes insufficient
Solution Approach 1:
The patent combines the radiation conductor and ground pattern to form a loop antenna structure, merging two separate components into a unified antenna system that extends communication distance while maintaining structural integration
Solution Approach 2:
The patent positions the radiation conductor and ground pattern on different plane positions, utilizing three-dimensional spatial arrangement to create an effective loop antenna that achieves extended communication distance without increasing planar footprint
2Reliability
If the radiation conductor is provided on a plane position different from that of the ground pattern, then the loop antenna can be formed, but the antenna device becomes large in planar size
Solution Approach 1:
The patent utilizes vertical spatial separation by positioning the radiation conductor and ground pattern on different plane positions, transforming a two-dimensional planar layout into a three-dimensional structure that achieves effective antenna function without increasing planar area
Solution Approach 2:
The patent integrates the loop antenna structure within the mobile wireless device housing, nesting the antenna components within available three-dimensional space to minimize planar footprint while maintaining functional integrity
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
The solution extends communication distance and reduces the planar size of the antenna device while maintaining effective antenna performance, even with electromagnetic shielding, by forming a larger loop antenna through the coil pattern and metal layers, and separating signal components effectively.
Implementation Method 1
a coil pattern having first and second terminals... connected in series with the loop antenna... solenoid coil obtained by winding a conductor around a plate-like magnetic member
Data Source
AI summary
Disclosed herein is an antenna device including a first metal layer having first and second areas, a coil pattern having first and second terminals, a first wiring pattern connected between the first area of the first metal layer and the first terminal of the coil pattern, and a second wiring pattern connected between the second area of the first metal layer and the second terminal of the coil pattern. The first metal layer, the first wiring pattern, and the second wiring pattern constitute at least a part of a loop antenna.