Portable Data Carrier Active Contactless Interface
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Solution Overview
Problem
Conventional RFID systems with passive transponders have limited communication ranges due to their reliance on magnetic or electromagnetic fields for energy and data transmission, while active transponders with their own energy supply face signal weakening at increased distances.
Innovation Solution
A portable data carrier, such as a mass storage card, generates and sends its own modulated field to a reading device, allowing it to simulate modulation of the reader's field without load or backscatter modulation, thereby extending the communication range beyond that of the reading device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If passive transponders use magnetic or electromagnetic fields for energy and data transmission, then the system is simple and energy-efficient, but the communication range is limited to around 10 cm to 1 m
Solution Approach 1:
The patent introduces a terminal device with a powerful transmitter as an intermediary between the passive transponder and the reading device. The terminal generates a strong magnetic field that extends the energy range beyond what the reading device alone can provide, enabling communication at distances greater than 1 m while the passive transponder still draws power from the field without its own energy supply
Solution Approach 2:
The system is divided into three functional components: the passive transponder (data carrier), the terminal device with extended range capability, and the reading device. This segmentation allows the terminal to handle the energy extension function while the transponder remains simple and passive, resolving the contradiction between energy efficiency and range
2Length of stationary object
If active transponders with their own energy supply are used, then the communication range is extended beyond the reading device's energy range, but the signal becomes weaker as distance increases and the system complexity increases
Solution Approach 1:
Instead of having the transponder actively transmit signals (which weakens with distance), the invention inverts the approach by using the terminal's powerful transmitter to generate the field, and the passive transponder merely modulates this field to convey data. This reversal maintains strong signal strength while achieving extended range
3Device complexity
If load modulation is used for data transmission from transponder to reader, then the system is simple, but the communication range is limited to 1 to 2 m even with active transponders
Solution Approach 1:
The terminal device acts as a mediator that provides the extended magnetic field necessary for load modulation to work at distances greater than 1 to 2 m. The terminal's powerful transmitter creates a field that spans the extended range, allowing the simple load modulation technique to achieve long-distance communication without increasing device complexity
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 enables communication over longer distances without the limitations of conventional systems, allowing for active or passive operating modes based on power supply or external commands, and switches between internal and terminal antennas for optimal performance.
Implementation Method 1
The portable data carrier, such as a mass storage card, sends a self-generated field as a signal to a reading device
Implementation Method 2
with which transponders can communicate by modulating the reading device field
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The method involves generating a field for transmission of data to a reading device in an active operating mode by a portable data processing medium that is designed as a mass memory card (120). A signal is selected for the reading device while modulating reading device fields by a transponder. The signal is selected by a change between an internal antenna (123) of the data processing medium and an antenna of an end device. The data processing medium is inserted in the end device for contactless data transmission. An independent claim is also included for a system for transferring data, comprising a portable data processing medium.