Authors: Toni Björninen, Hossein Saghlatoon, Lauri Sydänheimo, Yahya Rahmat-Samii, and Leena Ukkonen
Source: FERMAT, Volume 3, Article 6, May_Jun, 2014
Abstract: We review the performance analysis of RFID tags and the special features in metal mountable tags. The impact of the reader antenna polarization on the attainable read range of the tag is analyzed and included in the conventional link analysis. A new metrics for the reliability of the reader-to-tag link with respect to energy harvesting is investigated. We also propose a new design technique to improve the tolerance of a metal mountable tag toward the variations in the size of the metallic platform. Finally, we present a small slot antenna for metal mountable passive UHF RFID tags. It has an extremely small footprint of only 3×3 cm2 (0.0915λ× 0.0915λ at 915 MHz) and slim structure (thickness 1.5 mm) based on only a single conductor layer. Measurements verified the new design technique and results showed that the tag achieved state-of-the-art performance.
Index Terms: Radio-Frequency Identification, Metal mountable tag, Tag antenna, Slot antenna, Mutual polarization efficiency, Antenna spatial coverage
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Antennas for Small Metal Mountable Passive UHF RFID Tags: Challenges and Advances