NFC Antenna Design Reducing Production Cost
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Solution Overview
Problem
The production cost of Near Field Communication (NFC) devices is high due to the design of NFC antennas, which affects the overall cost and performance of NFC devices and mobile devices that incorporate them.
Innovation Solution
A near field communication (NFC) antenna design featuring a loop coil with multiple turns on a substrate, where the first antenna electrode is inside each turn and the second antenna electrode is outside, along with a resonance coil and capacitor configuration, optimized for a self-resonance frequency of 13.56 MHz, to reduce production costs while maintaining high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional NFC antenna design is used, then the NFC device can perform near field communication, but the production cost increases
Solution Approach 1:
The patent combines the NFC antenna structure with the existing mobile device housing or battery cover, integrating the antenna into components that already exist in the device. This eliminates the need for separate antenna components and reduces production costs while maintaining NFC communication functionality.
Solution Approach 2:
The antenna design uses the mobile device's existing metal components (such as the battery cover or housing) to serve dual purposes: both as structural elements of the device and as the NFC antenna itself. This multi-functionality reduces the number of separate components needed and lowers production costs.
2Reliability
If a conventional NFC antenna design is used, then the NFC device can emit electromagnetic waves, but the production cost and device thickness increase
Solution Approach 1:
The patent extracts the antenna function from a separate, thick antenna component and integrates it into the thin metal housing or battery cover of the mobile device. This eliminates the need for additional thickness while maintaining electromagnetic wave emission capability.
Solution Approach 2:
The design utilizes thin metal films or shells that form part of the device structure (such as the battery cover) to serve as the NFC antenna. These thin components maintain electromagnetic functionality without adding significant thickness to the device.
3Reliability
If a conventional NFC antenna design is used, then the NFC device can communicate, but the production yield decreases
Solution Approach 1:
By merging the antenna function with existing structural components like the battery cover or housing, the patent eliminates separate antenna assembly steps and reduces the number of components that need to be manufactured and assembled. This integration simplifies the production process and increases manufacturing yield.
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 design reduces the production cost and thickness of NFC antennas, increases yield, and enhances communication range by efficiently emitting electromagnetic waves, thereby addressing the high production cost issue of NFC devices.
Implementation Method 1
a loop coil formed on the first surface of the substrate, the loop coil being directly coupled between the first antenna electrode and the second antenna electrode and including a first plurality of turns
Implementation Method 2
optimized for a self-resonance frequency of 13.56 MHz
Data Source
AI summary
A near field communication (NFC) antenna includes a first antenna electrode and a second antenna electrode, and a loop coil. The first and second antenna electrodes are formed on a first surface of a substrate. The loop coil is formed on the first surface of the substrate, is directly coupled between the first antenna electrode and the second antenna electrode, and includes a first plurality of turns. The first antenna electrode is located inside each of the plurality of turns of the loop coil, and the second antenna electrode is located outside each of the plurality of turns of the loop coil. An imaginary line passing through the first antenna electrode and the second antenna electrode is parallel to one of edges of the substrate. Each of the first plurality of turns of the loop coil does not overlap each other.