RFID Reader Casing Reflectors for Obstacle-Blocked Tag Reading
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Solution Overview
Problem
Existing RFID tag reading apparatuses face challenges in efficiently reading information when obstacles, such as metal, are present between the reader/writer antenna and the RFID tag, as electromagnetic waves may not reach the tag effectively.
Innovation Solution
A reading apparatus with a casing featuring reflective surfaces having normal lines at different angles, allowing electromagnetic waves to be radiated in directions not parallel to these lines, ensuring that waves can reach the RFID tag even behind obstacles by reflecting off these surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic waves are radiated directly from the antenna, then the reading speed is fast, but the waves cannot reach the RFID tag when obstacles are present
Solution Approach 1:
The patent introduces reflective surfaces positioned at specific angles to redirect electromagnetic waves along alternative paths. When direct wave propagation is blocked by obstacles, the waves reflect off these surfaces and reach the RFID tag from different directions, effectively adding spatial dimensions to the wave propagation paths and ensuring reliable communication without sacrificing reading speed.
2Productivity
If the antenna is positioned to read tags frequently, then reading efficiency improves, but repositioning is required when obstacles block the signal
Solution Approach 1:
The reflective surfaces act as intermediaries between the antenna and the RFID tag. Instead of repositioning the antenna when obstacles are detected, the system uses these fixed reflective surfaces to mediate the electromagnetic wave transmission, redirecting waves around obstacles and maintaining reading efficiency without requiring any movement or complex repositioning operations.
3Object-affected harmful factors
If electromagnetic wave shielding plates are used to shield harmful waves, then electromagnetic interference is reduced, but the waves cannot reach tags behind metal obstacles
Solution Approach 1:
The patent applies different functional properties to different parts of the antenna structure. Electromagnetic wave shielding plates are installed in certain areas to block harmful interference, while reflective surfaces are positioned in specific locations and at particular angles to redirect useful waves toward obstacles. This localized differentiation of functional qualities allows the system to simultaneously shield against interference and maintain reliable tag reading through strategic wave reflection.
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 configuration enables efficient reading of RFID tag information without the need to frequently reposition the tag, increasing the electric power supplied to the tag and reducing erroneous readings by ensuring electromagnetic waves reach the tag from multiple directions.
Implementation Method 1
a casing (110) having a reflective surface (114) in at least a part of an inner side; and an antenna (120) provided in the casing (110) and used to read information from an RFID tag (14)
Data Source
AI summary
Provided is a reading apparatus capable of efficiently reading information from an RFID tag. A reading apparatus (1) includes at least one antenna (2) and a casing (10). The casing (10) has reflective surfaces (12) in at least a part of the inner side. The antenna (2) is provided in the casing (10), and is used to read information from an RFID tag. The antenna (2) is disposed in the vicinity of reflective surfaces (12A) and (12B) having two or more normal lines (N1) and (N2) at different angles, and radiates electromagnetic waves toward at least a direction that is not parallel to the directions of the normal lines (N1) and (N2).