Resonant Transponder Pair for Compact NFC Range Extension
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Solution Overview
Problem
Existing transponders with small antennas face limitations in achieving adequate communication distance while maintaining reduced dimensions, and are typically limited to single functions, requiring multiple devices for multiple functions.
Innovation Solution
A pair of transponders with interconnected spiral antennas, where one transponder forms a resonator circuit for the other, enhancing communication distance by 10-20% and enabling dual functions in a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna dimensions are reduced to minimize terminal footprint, then the terminal size is reduced, but the communication range is insufficient
Solution Approach 1:
The patent combines a spiral antenna and a linear antenna into a single integrated antenna structure. The spiral antenna provides compact size while the linear antenna extends the effective electrical length, achieving both small physical footprint and adequate communication range within the same terminal device.
Solution Approach 2:
The integrated antenna structure serves multiple functions: the spiral portion provides inductance and compact geometry, while the linear portion acts as a resonator to extend communication range. This multi-functional design eliminates the need for separate antennas for different functions.
2Length of stationary object
If a second antenna is added in parallel to increase communication range, then the communication range is improved, but the device volume increases
Solution Approach 1:
Instead of adding a separate second antenna that would increase device volume, the patent integrates the resonator function directly into the antenna structure by extending the spiral antenna into a linear configuration. This unified structure achieves enhanced communication range without requiring additional antenna components.
3Adaptability or versatility
If multiple transponders are combined to achieve multiple functions, then the functionality is expanded, but the device complexity increases
Solution Approach 1:
The patent implements a single transponder equipped with an integrated antenna structure that can perform multiple functions (NFC payments, access control, etc.). This universal design allows one transponder to replace multiple specialized transponders, reducing device complexity while maintaining versatile functionality.
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 allows for improved communication range and the integration of multiple functions in a compact form factor, such as a watch, enabling efficient NFC-type data transfer and dual functionality like payment and access control.
Implementation Method 1
the second antenna is arranged and configured so that the second transponder forms a resonator circuit of the first antenna
Data Source
Figure 1~2
AI summary
The invention relates to a pair of transponders (1) comprising a first transponder (10) equipped with a first electronic system (3) for managing data transmission and reception and a first antenna, the first electronic system (3) being connected to the first antenna; the pair of transponders (1) comprising a second transponder (12) equipped with a second electronic system (9) for managing data transmission and reception and a second antenna, the second electronic system (9) being connected to the second antenna, characterized in that the second antenna is configured and arranged so that the second transponder (12) forms a resonator circuit of the first antenna. The invention also relates to an electronic device, in particular a timepiece comprising such a pair of transponders (20).