Bio-inspired circular polarized UHF RFID tag design using characteristic mode analysis

Abubakar Sharif, Rajesh Kumar, Turke Althobaiti, Abdullah Alhumaidi Alotaibi, Lubna, Naeem Ramzan, Muhammad Ali Imran, Qammer H. Abbasi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
13 Downloads (Pure)

Abstract

This article presents a bio-inspired circularly polarized ultrahigh-frequency (UHF) radio frequency identification (RFID) tag antenna for metallic and low-permittivity substances. This tag design is based on a leaf-shaped radiator, two shorting stubs, and slots etched on F4B substrate. Initially, the tag antenna is designed using a characteristics mode analysis (CMA) by analyzing the first six characteristic modes (CM) and characteristic angles. The width of orthogonal slots is varied to get the resonance of CM modes in the required US RFID band. Moreover, the edges are blended to get orthogonal current distribution, which is necessary for circular polarization. In addition, the proposed tag design is optimized further using CST Microwave studio and an RFID chip is exploited as a capacitive coupling element (CCE) to run CM modes with the orthogonal current pattern. This tag can also be tunable to European RFID (EU) band (866-868 MHz) by changing the length of shorter diagonal slot. The tag design offers a read range of 7-4.5 m on 100×100 mm2 metals plate and low-permittivity substrates (for the 902-928-MHz band). In the EU band, the corresponding read ranges are 5.7 and 3.5 m above metal and low-permittivity objects, respectively. This circularly polarized tag antenna is advantageous in terms of cost, circular polarization feature, and ease of fabrication due to the absence of vias, shorting pins, and matching circuits. Therefore, this tag design is suitable for labeling various low-permittivity objects, industrial conveyer belt applications, baggage handling systems, and Internet of Things (IoT) applications.

Original languageEnglish
Pages (from-to)10847-10855
Number of pages9
JournalIEEE Sensors Journal
Volume23
Issue number10
Early online date3 Apr 2023
DOIs
Publication statusPublished - 15 May 2023

Keywords

  • circular polarized (CP)
  • RFID
  • tag antenna
  • IoT systems
  • conveyer belt applications

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