RFID Reader with Contactless Coupled Antenna Positioning
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Solution Overview
Problem
Existing RFID readers face limitations in flexible positioning and rotation of the antenna relative to the housing, with connectors often being inflexible and prone to disconnection, which is undesirable for certain applications.
Innovation Solution
A RFID reader design featuring a coupling loop that is electromagnetically coupled to a passive loop antenna, allowing for displacement and rotation within a defined plane, with a constrained movement area to maintain consistent magnetic coupling, and incorporating a guidance mechanism to ensure proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a connector with cable is used for RFID reader, then flexibility in positioning is improved, but reliability deteriorates due to easy disconnection
Solution Approach 1:
The system is divided into a fixed antenna housing and a movable connector housing that can be independently positioned. The connector housing can be adjusted to different positions and angles relative to the antenna, allowing flexible positioning while maintaining a permanent, reliable connection between the connector and cable assembly.
Solution Approach 2:
The connector housing is designed to be movable relative to the antenna housing, allowing dynamic adjustment of the connector position. This enables the connector to be positioned optimally for different cable routing configurations while maintaining a secure, permanent connection that prevents disconnection.
2Device complexity
If connector position is fixed relative to housing, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The connector housing is designed with movable elements that allow it to be positioned at different locations and orientations relative to the antenna housing. This dynamic positioning capability provides adaptability for various cable routing scenarios while maintaining relatively simple construction through the use of basic mechanical adjustment features.
3Ease of operation
If coupling loop is displaced outside passive loop antenna area, then ease of operation is improved, but magnetic coupling deteriorates
Solution Approach 1:
The system provides freedom of movement in three-dimensional space for the connector housing, allowing it to be positioned in locations that are easily accessible for cable connection. The magnetic coupling is maintained through proper design of the coupling loop and passive loop antenna geometry, ensuring that even when the connector is positioned away from the center of the passive loop antenna, adequate signal coupling is achieved.
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 flexible and reliable positioning of the connector relative to the housing, maintaining consistent signal coupling and reducing the risk of disconnection, while being cost-effective.
Implementation Method 1
The passive loop antenna is in close proximity to the coupling loop such that the passive loop antenna is coupled electromagnetically to the coupling loop
Implementation Method 2
The passive loop antenna is configured to inductively couple with a RFID device e.g., a RFID transponder
Data Source
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AI summary
A RFID Reader includes a coupler housing and an antenna housing. The coupler housing further comprises a RFID transceiver and a coupling loop coupled to the RFID transceiver. The antenna housing comprises a passive loop antenna. The passive loop antenna is in close proximity to the coupling loop such that the passive loop antenna is coupled electromagnetically to the coupling loop and therefore the RFID transceiver can use the passive loop antenna for communication to a RFID device.