Dual-Antenna NFC Extension for Reading Through Obstacles
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Solution Overview
Problem
NFC card reader devices require close proximity to contactless cards for reading, leading to a small reading area and operational inconvenience, especially when obstacles like thick wooden boards or metal interfere with signal transmission.
Innovation Solution
An NFC extension device with dual antenna structures and a transmission line to extend the reading range, utilizing impedance resonant circuits and coils for signal transmission and reception, allowing the device to couple with both the card reader and contactless cards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the card reader device is placed closer to the contactless card to complete reading, then the reading reliability is improved, but the reading area becomes very small and operational convenience deteriorates
Solution Approach 1:
The NFC extension device divides the antenna system into two separate antenna structures: a first antenna structure that couples with the card reader device and a second antenna structure that couples with the contactless card. This segmentation allows each antenna to be optimized for its specific coupling requirement while extending the overall reading area, resolving the contradiction between reading reliability and operational convenience.
Solution Approach 2:
The transmission line acts as an intermediary component connecting the first antenna structure and the second antenna structure. This intermediary enables signal transmission between the two antenna structures, allowing the card reader device to communicate with contactless cards at extended distances while maintaining reading reliability through the coordinated action of both antenna structures.
2Adaptability or versatility
If the card reader device is installed in areas with thick wooden boards, glass, or metal blocks, then the adaptability is improved, but the signal transmission is blocked and reading reliability deteriorates
Solution Approach 1:
The patent introduces a spatial dimension solution by placing the second antenna structure on the opposite side of the obstacle from the card reader device. This dimensional arrangement allows the NFC extension device to bypass obstacles like thick wooden boards, glass, or metal blocks by routing signals through a different spatial path, thereby maintaining reading reliability while improving installation flexibility.
Solution Approach 2:
The transmission line serves as an intermediary that bridges the gap between the first antenna structure (near the card reader device) and the second antenna structure (near the contactless card). This intermediary component enables signal transmission through or around obstacles, allowing the system to adapt to various installation environments while maintaining reliable card reading.
3Device complexity
If a single antenna structure is used for both coupling with card reader and contactless card, then the device complexity is reduced, but the reading area extension capability is limited
Solution Approach 1:
The antenna system is segmented into two distinct antenna structures with specialized functions: the first antenna structure optimizes coupling with the card reader device, while the second antenna structure optimizes coupling with contactless cards. This segmentation enables each antenna to be designed for its specific function, thereby extending the reading area while keeping the overall device complexity manageable through modular design.
Solution Approach 2:
The NFC extension device achieves multi-functionality by integrating both a first antenna structure for card reader coupling and a second antenna structure for contactless card coupling within a single device. This universal design allows the device to perform multiple functions (extending reading area, adapting to obstacles) while maintaining reasonable complexity through unified integration.
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
Enhances the reading range and user experience by facilitating card reading through obstacles, reducing operational strain and improving flexibility in using NFC devices.
Implementation Method 1
the first antenna structure is configured to couple with a card reading device to receive a card reading command signal and to transmit the card reading command signal to the second antenna structure through the transmission line
Implementation Method 2
the second antenna structure is configured to couple with a contactless card for transmitting the card reading command signal into the contactless card
Implementation Method 3
the first antenna structure comprises a first impedance resonant circuit and a second impedance resonant circuit, the second antenna structure comprises a third impedance resonant circuit and a fourth impedance resonant circuit
Data Source
AI summary
A near field communication extension device and a system are disclosed in the present application. The near field communication extension device includes a first antenna structure, a second antenna structure and a transmission line, the first antenna structure includes a first impedance resonant circuit and a second impedance resonant circuit, the second antenna structure includes a third impedance resonant circuit and a fourth impedance resonant circuit, two ends of the first impedance resonant circuit are respectively connected to two ends of the third impedance resonant circuit through the first cable and the second cable, and a first end of the second cable is connected to a first connection point between the first impedance resonant circuit and the second impedance resonant circuit, and a second end of the second cable is connected to a second connection point between the third impedance resonant circuit and the fourth impedance resonant circuit.