RFID Adapter Gesture Recognition via Antenna Voltage Sensing
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Solution Overview
Problem
Current RFID systems for secure documents lack an efficient and secure method for user input, relying on mechanical elements that are prone to wear and vulnerable to environmental conditions, and do not provide adequate security against unauthorized data entry.
Innovation Solution
A document with a contactless interface and integrated antenna for electromagnetic coupling, using signal generating means to recognize gestures for input, allowing secure and wear-free data entry without mechanical elements, and incorporating a battery for power supply to enhance security and usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical input elements (buttons, switches) are used on secure documents, then user input functionality is achieved, but reliability deteriorates due to wear and environmental vulnerability
Solution Approach 1:
The patent replaces mechanical input elements (buttons, switches) with a contactless interface using RFID technology. The user interacts with the document by bringing it close to a reader device, eliminating mechanical components that are prone to wear and environmental damage. This substitution maintains ease of operation while significantly improving reliability.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the user and the document's input system. Instead of direct mechanical contact, the user's input is transmitted wirelessly through electromagnetic coupling between the reader device and the document's antenna, eliminating the need for physical buttons or switches.
2Reliability
If contactless interface with gesture recognition is implemented, then security against unauthorized data entry is improved, but device complexity increases
Solution Approach 1:
The patent makes the antenna serve multiple functions: it acts as both the RFID communication antenna for data transmission and the sensing element for gesture recognition. By detecting changes in electromagnetic coupling when the document is moved relative to the reader, the system recognizes gestures without requiring separate sensing hardware, thereby reducing overall system complexity.
Solution Approach 2:
The patent combines the RFID communication function and the gesture recognition function into a single integrated system. The same antenna and electromagnetic field are used for both data communication and motion sensing, merging two functions into one unified approach that reduces component count and system complexity.
3Ease of operation
If mechanical input elements are used, then ease of operation is maintained, but manufacturing precision requirements increase due to assembly tolerances
Solution Approach 1:
The patent eliminates mechanical input elements entirely, replacing them with a contactless interface. This removes the need for precise mechanical assembly of buttons, switches, or other physical input components, thereby significantly reducing manufacturing precision requirements while maintaining ease of operation.
Solution Approach 2:
The patent extracts and removes mechanical input elements from the document structure. By eliminating these components entirely and replacing them with contactless technology, the patent avoids all associated manufacturing and assembly precision requirements while preserving user input 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
Enables secure and efficient user input on secure documents, such as chip cards, by recognizing gestures within an electromagnetic field, providing high security and comfort without the need for mechanical interfaces, and ensuring robustness against environmental factors.
Implementation Method 1
with at least one antenna (112) for contactless coupling of electrical energy of an electromagnetic field
Implementation Method 2
a reading device (182), which is designed to generate an electromagnetic field for contactless power supply of the document (100) and/or for communication between the reading device (182) and the document (100)
Data Source
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AI summary
The invention relates to an adapter for a reading device (182) with at least two antennas (117.1, 117.2) for electromagnetic coupling with an antenna (112) of a document (100), means (119.1, 119.2) for sensing a temporal profile of one of the antenna voltages of the at least two antennas of the adapter (123), wherein the respective antenna voltages depend on a load exerted due to the coupling factors between the antenna of the document and the antennas of the adapter, signal generating means (101) for generating an input signal depending on the sensed antenna voltages, and a further antenna (125) for electromagnetic coupling with the antenna (117) of a reading device (182) for transmitting the input signal to the reading device.