Rotatable Linearly Polarized Antenna for RFID Orientation Adaptability
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Solution Overview
Problem
Existing RFID tag reading devices face inefficiencies and failures when attempting to read multiple tags simultaneously, particularly due to orientation issues and limited reading areas, which hampers merchandise and inventory management processes.
Innovation Solution
A reading device equipped with a rotatable linearly polarized antenna that moves along a surface and rotates around an axis normal to the antenna surface, allowing for efficient communication with RFID tags regardless of their orientation by adjusting the polarization direction and expanding the reading area with higher electric field intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed linearly polarized antenna is used for RFID tag reading, then the device structure is simple, but the reading fails when tags are in certain orientations
Solution Approach 1:
The patent employs a rotatable antenna mechanism that can dynamically change its polarization direction to match the orientation of RFID tags. The antenna rotates around an axis normal to its radiating surface, enabling it to adapt to tags placed in various orientations, thereby resolving the contradiction between reading reliability and structural simplicity.
Solution Approach 2:
The patent changes the polarization parameter of the antenna by rotating it to different angles. This parameter change allows the antenna to communicate effectively with RFID tags regardless of their orientation, improving reading reliability without requiring multiple fixed antennas.
2Reliability
If multiple fixed antennas are used to cover all orientations, then all tag orientations can be read, but the device structure and cost become complex
Solution Approach 1:
Instead of using multiple fixed antennas simultaneously, the patent uses a single antenna that rotates dynamically to cover all necessary orientations. This dynamic approach achieves comprehensive tag reading coverage while maintaining simpler device structure and lower cost compared to a multi-antenna array.
Solution Approach 2:
The antenna performs periodic rotation to sequentially cover different polarization directions. This periodic action allows a single antenna to achieve the same effect as multiple fixed antennas would provide, reducing system complexity while maintaining comprehensive reading coverage.
3Adaptability or versatility
If the antenna rotates continuously, then all tag orientations can be read, but the reading time increases
Solution Approach 1:
The antenna rotates periodically through discrete angular positions rather than continuously scanning. This periodic rotation at specific angles allows the system to cover all necessary orientations while minimizing the total rotation time, thus reducing the loss of reading time while maintaining full orientation adaptability.
Solution Approach 2:
The system performs preliminary rotation to predetermined angular positions before attempting to read tags. This preliminary positioning ensures that the antenna is already oriented correctly for reading, reducing the time needed during the actual reading process and improving overall efficiency.
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 enhances reading accuracy and efficiency by enabling the reading of RFID tags in various orientations without failure, combining the advantages of linearly and circularly polarized wave antennas, thus improving information communication efficiency and preventing tag reading drops.
Implementation Method 1
an antenna 22 having a signal radiating surface and configured to output a linearly polarized wave from the radiating surface
Implementation Method 2
a movable and rotatable stage supporting the antenna 22 and configured to move the antenna 22 along a first direction parallel to the radiating surface of the antenna 22
Implementation Method 3
rotate the antenna 22 on an axis that is normal to the radiating surface of the antenna 22
Implementation Method 4
a tag reader connected to the antenna 22 and configured to supply signals to the antenna 22 for reading information from a wireless tag and to receive signals from the antenna 22 including information read from the wireless tag
Data Source
AI summary
A reading device includes an antenna having a signal radiating surface and configured to output a linearly polarized wave from the radiating surface, a movable and rotatable stage supporting the antenna and configured to move the antenna along a first direction parallel to the radiating surface of the antenna and rotate the antenna on an axis that is normal to the radiating surface of the antenna, and a tag reader connected to the antenna and configured to supply signals to the antenna for reading information from a wireless tag and to receive signals from the antenna including information read from the wireless tag.