Passive RFID Protocol Selection for Field-Gap Timing Calibration
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Solution Overview
Problem
Existing passive RFID systems with inductive coupling face challenges in ensuring error-free data transmission due to parameter-dependent timing variations, which can lead to corrupted character sequences when transponders do not support specific transmission protocols.
Innovation Solution
A method for wireless data transmission between a base station and a passive transponder using inductive coupling, allowing selection between data transmission protocol types by writing a configuration register, either remotely or during manufacturing, with or without transmitting a reference duration for calibration, enabling flexible protocol adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the quality of the parallel resonant circuit is increased to enable power supply at greater distances, then the transmission range is improved, but the timing precision of detected field gaps deteriorates
Solution Approach 1:
The patent applies preliminary action by sending a reference duration (calibration signal) before the actual data transmission. This reference duration allows the transponder to pre-calibrate its timing measurements and compensate for the timing shifts caused by high-quality resonant circuits, thereby maintaining measurement precision while operating at extended transmission ranges.
2Adaptability or versatility
If a reference duration is transmitted for calibration, then compatibility with different transponder types is improved, but the data transmission protocol complexity increases
Solution Approach 1:
The patent applies dynamics by making the protocol structure adaptable rather than fixed. The system dynamically adjusts its operation based on transponder capabilities - it can send reference durations when needed for calibration while omitting them when not required, allowing the same base station to work with both simple and complex transponder types without requiring a completely different protocol for each.
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 approach ensures flexible and interference-free data transmission across different protocol types, compensating for timing variations and allowing compatible communication between base stations and transponders with varying capabilities.
Implementation Method 1
data transmission between a base station and a passive transponder by inductive coupling
Implementation Method 2
quality of a parallel resonant circuit, formed by the antenna coil and a capacitor connected parallel thereto, is increased
Data Source
AI summary
A method for wireless data transmission, in, for example, RFID systems, between a base station and a passive transponder, as well as a passive transponder is provided by inductive coupling, as well as a passive transponder. It is possible to transmit data from the base station to the transponder by a first data transmission protocol type and by at least one second data transmission protocol type, whereby the first or the at least second data transmission protocol type is selected by writing a configuration register in the transponder.