研究目的
To demonstrate how a conductive feed can excite a standing surface wave on a metallic object to power a passive UHF RFID sensor tag, compare read rates with free space, and show its application in structural health monitoring.
研究成果
The standing surface wave method significantly enhances read rates and sample rates for passive UHF RFID sensor tags on metallic structures, enabling effective structural health monitoring with potential cost savings compared to traditional systems.
研究不足
The method may be limited on wider metallic objects due to faster field decay, and performance decreases as the tag is moved vertically away from the surface, transitioning to far-field behavior beyond 13 cm.
1：Experimental Design and Method Selection:
The experiment involved comparing read rates of a passive UHF RFID sensor tag (WISP
2：0) in free space and along a metallic bar structure excited by a conductive feed. Simulations using FEKO were conducted to model field distributions. Sample Selection and Data Sources:
A metallic bar (
3：02m long, 5cm wide, 5mm thick) was used. The WISP 0 tag was moved in 5 cm increments for measurements. List of Experimental Equipment and Materials:
Equipment included a Laird circular polarized antenna (6 dBi gain), Impinj Speedway R420 reader, WISP
4：0 sensor tag, and cables. Experimental Procedures and Operational Workflow:
For free space, the tag was moved from the antenna, and read rates were recorded over 60 seconds with constant reader power. For the bar setup, the feed was conductively connected, and the tag was moved along the bar with adjusted power to maintain EIRP. The accelerometer on the WISP was activated, and data was collected.
5：Data Analysis Methods:
Read rates were measured and compared. Sensor data from the accelerometer was processed from hexadecimal to decimal units of ms-2.
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