NFC Antenna Matching Network with Separated Resonators
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Solution Overview
Problem
Existing NFC antenna matching networks face performance issues due to impedance interference between serial and parallel resonators, leading to reduced transfer efficiency and recognition distance in NFC communication.
Innovation Solution
A smart NFC antenna matching network system is designed with physically separated serial and parallel resonators, where the source coil forms a magnetic field for transmission and the resonant coil is supplied with power for reception, minimizing impedance interference and enhancing current strength and recognition distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If serial and parallel resonators are integrated in a conventional NFC antenna matching network, then the device structure is compact, but impedance interference occurs between resonators leading to reduced transfer efficiency and recognition distance
Solution Approach 1:
The patent divides the NFC antenna matching network into two physically separated resonators: a serial resonator (including source coil Ls and capacitors Cs1, Cs2) and a parallel resonator (including resonant coil Lr and capacitor Cr). This segmentation eliminates impedance interference between the resonators while maintaining compact overall structure, thereby improving transfer efficiency and recognition distance.
2Productivity
If serial and parallel resonators are physically separated, then impedance interference is minimized and current strength increases, but the device structure becomes more complex
Solution Approach 1:
The patent resolves the structural complexity issue by arranging the serial and parallel resonators in different spatial dimensions or planes. The source coil and resonant coil are positioned at different locations and orientations, utilizing three-dimensional space efficiently. This dimensional arrangement achieves physical separation to minimize impedance interference while maintaining a compact overall device footprint.
3Reliability
If the resonant coil is supplied with power for reception, then reception voltage increases, but energy consumption increases
Solution Approach 1:
The patent combines the serial resonator and parallel resonator into a unified NFC antenna matching network system that shares common capacitors (Cs1, Cs2) and operates at the same NFC frequency. The resonant coil Lr is supplied with power through magnetic coupling from the source coil Ls, allowing the system to achieve high reception voltage while efficiently managing power consumption through the integrated resonant structure.
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 reduces impedance, increases current and magnetic field strength, and enhances NFC signal recognition distance and reception voltage, improving overall NFC communication performance.
Implementation Method 1
a source coil (Ls) connected between a first terminal (202) and a second terminal (203) of the NFC transceiver (200)
Implementation Method 2
a resonant coil (Lr) physically separated from the source coil
Data Source
AI summary
A Near Field Communication (NFC) antenna matching network system is provided for connection with an NFC. The NFC antenna matching network system includes a source coil connected between a first terminal and a second terminal of the NFC transceiver; and a resonant coil physically separated from the source coil.