Integrated NFC Module with Internal Impedance Matching
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Solution Overview
Problem
Implementing near field communication (NFC) functionality in devices with a small form factor is challenging due to interference from metal surroundings, requiring specialized knowledge and test systems, and often results in limited communication range and performance.
Innovation Solution
A communication module with a loop antenna, modulation circuit, and impedance matching circuit integrated inside a carrier, which eliminates the need for external front-ends and interfaces, allowing for efficient NFC implementation without requiring specialized knowledge of contactless communication from module manufacturers and enabling optimized antenna directivity and reduced component space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If NFC functionality is implemented using external front-end circuits and separate antenna modules, then communication performance can be maintained, but device form factor increases and integration complexity increases
Solution Approach 1:
The patent combines the antenna, impedance matching circuit, and modulation/demodulation circuit into a single integrated NFC module. The loop antenna is formed directly on the carrier board with integrated circuits mounted within the antenna perimeter, eliminating the need for separate external front-end circuits and reducing overall device form factor while maintaining NFC functionality.
Solution Approach 2:
The carrier board serves multiple functions simultaneously: it acts as the substrate for the loop antenna, provides impedance matching through integrated circuits, and houses the modulation/demodulation functionality. This multi-functional integration reduces the number of separate components needed and simplifies the overall system architecture.
2Ease of manufacture
If NFC components are integrated inside the loop antenna on the carrier, then component space is reduced and manufacturing is simplified, but impedance matching and signal quality become more challenging
Solution Approach 1:
The impedance matching circuit is specifically designed and positioned within the antenna structure at locations optimized for signal coupling. The integration is performed with attention to local electromagnetic field distribution, ensuring that the matching circuit operates effectively within the constrained space inside the loop antenna while maintaining signal quality.
3Reliability
If specialized knowledge and test systems are required for NFC implementation, then communication performance can be optimized, but development time and cost increase
Solution Approach 1:
The integrated NFC module is designed as a self-contained unit where the antenna, impedance matching, and modulation circuits work together as a pre-optimized system. This self-service design allows the module to function reliably without requiring external specialized test systems or deep NFC expertise for basic implementation, reducing development time while maintaining communication performance.
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 solution enables efficient NFC functionality in small form factor devices with improved communication performance and reduced interference, eliminating the need for specialized knowledge and test systems, and allowing for direct integration in communication devices without additional NFC expertise.
Implementation Method 1
a loop antenna (202) and a modulation circuit (203) which is coupled to the loop antenna and is configured to modulate or demodulate signals which are received or transmitted using the loop antenna
Implementation Method 2
an impedance matching circuit (204) for matching the impedance of the loop antenna (202) to the input impedance of the modulation circuit (203)
Data Source
AI summary
Various embodiments provide a communication module having a carrier, a loop antenna, a modulation circuit which is coupled to the loop antenna and is configured to modulate or demodulate signals which are received or transmitted using the loop antenna, and an impedance matching circuit for matching the impedance of the loop antenna to the input impedance of the modulation circuit. The modulation circuit and the impedance matching circuit are arranged inside the loop antenna on or in the carrier.