LOW-PROFILE, DUAL-BAND, UNIDIRECTIONAL RFID TAG ANTENNA USING METASURFACE

In this paper, a low-profile, dual-band, unidirectional, tag antenna is proposed for ultrahigh frequency band (UHF) radio frequency identification (RFID) applications. The antenna consists of a compact printed dipole, a metasurface of 4 × 4 periodic metallic plates, and a metallic reflector. The dipole antenna is fed by a modified T-matching network for a conjugate impedance matching with the UCODE G2XM chip. The metasurface is designed to work as an artificial magnetic conductor surface, which allows low-profile configuration and unidirectional radiation. More interestingly, the finite-sized metasurface generates extra resonance for the antenna system, which is combined with dipole resonance for the dual-band operation. For an easy realization and low cost, the dipole and metasurface are built on the top and bottom sides of a thin FR-4 substrate, respectively. The final design with overall size of 190mm× 190mm × 15.8 mm (0.532λ × 0.532λ × 0.044λ at 840 MHz) yields a simulated |S11| < −10 dB bandwidth of 840–855 MHz and 916–932 MHz and a unidirectional radiation with a directivity of 7.0 dB and 5.8 dB at 925 MHz and 845 MHz, respectively. The antenna has been fabricated and tested. The measured readable range agrees rather closely with the predicted values. The measurements result in the maximum readable range of 6-m and 4.4-m at standard frequency bands of FCC (902–928 MHz) for North America and IN (840–845 MHz) for India, respectively.

• Publication year

  2019

• Venue

  Progress In Electromagnetics Research C

• Publication date

  Unknown publication date

• Fields of study

  Mathematics, Engineering

• Identifiers
  DOI 10.2528/pierc19041505
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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