RFID Tag Reader Antenna Movement Synchronization
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Solution Overview
Problem
RFID tag reading devices face challenges in ensuring complete reading range coverage due to transmission time limits for radio waves, leading to potential missed tags when the antenna position changes during or after transmission.
Innovation Solution
An RFID tag reading device with a movable antenna mechanism that only moves during transmission periods and stops moving when radio waves are not being transmitted, ensuring continuous coverage by synchronizing antenna movement with radio wave emission and compliance with transmission time regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the antenna moves continuously during tag reading, then the reading coverage area is improved, but tags may be missed due to transmission time limits
Solution Approach 1:
The antenna performs periodic movement cycles consisting of a movement period followed by a stationary period. During the stationary period, radio waves are transmitted to ensure complete tag reading within the transmission time limit. This periodic alternation between movement and stationarity allows the system to maintain both wide coverage and reliable reading completeness.
Solution Approach 2:
The antenna completes its movement to the next position before the radio wave transmission begins. This preliminary positioning ensures that when transmission starts, the antenna is already in the optimal position for that transmission cycle, preventing any gap in coverage while ensuring tags are read completely during the subsequent stationary transmission period.
2Area of stationary object
If the antenna moves during radio wave transmission, then coverage area is expanded, but transmission time limit regulations are violated
Solution Approach 1:
The system implements periodic transmission cycles where the antenna remains stationary during each transmission period to comply with transmission time limit regulations. Between these regulated transmission periods, the antenna moves to new positions, thereby expanding overall coverage while maintaining regulatory compliance through the stationary-transmission pattern.
3Productivity
If the antenna moves faster, then reading efficiency is improved, but reading completeness deteriorates due to transmission time limits
Solution Approach 1:
The antenna operates in periodic cycles of rapid movement followed by stationary transmission periods. The fast movement phase improves reading efficiency by quickly covering multiple positions, while the subsequent stationary phase ensures complete tag reading at each position within transmission time limits. This periodic alternation balances speed and completeness.
Solution Approach 2:
The antenna performs rapid preliminary movement to positioning points before transmission begins. This preliminary fast movement establishes the reading efficiency, while the subsequent stationary transmission phase ensures reading completeness, allowing the system to achieve both high speed and reliability.
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 solution ensures comprehensive reading range coverage, preventing missed tags by coordinating antenna movement with radio wave transmission, thus adhering to regulatory time limits and enhancing reading efficiency.
Implementation Method 1
an antenna 22 for transmitting radio waves to an electronic tag T
Data Source
AI summary
An electronic tag reading device includes an antenna for transmitting wireless signals to an electronic tag for reading information stored in the electronic tag, an electronic tag reader electrically coupled to the antenna, the electronic tag reader supplying signals to the antenna and receiving signals from the antenna for reading information stored in the electronic tag, and a movable stage connected to the antenna and configured to move the antenna when the antenna is transmitting wireless signals during a tag reading process of the electronic tag reader and stop moving the antenna when the antenna is not transmitting wireless signals during the tag reading process.