A Wideband Single-Fed, Circularly-Polarized Patch Antenna with Enhanced Axial Ratio Bandwidth for UHF RFID Reader Applications

Junlong Li, Hui Liu, Shuai Zhang, Miaohui Luo, Yuan Zhang, Sailing He

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)
62 Downloads (Pure)

Abstract

A wideband single-fed, circularly-polarized patch antenna with enhanced axial ratio bandwidth for RFID reader application is proposed. The antenna consists of a modified half E-shaped patch, a near-field resonant parasitic (NFRP) patch, and four rotated vertical metallic plates on the ground plane. The metallic plates surrounding the main radiator of the modified half E-shaped patch antenna are fabricated vertically on the ground plane. The operating frequency of the antenna decreases substantially with the vertical metallic plates, which is important for miniaturization of RFID applications. With an elliptical slot and a cut on the modified half E-shaped patch, antenna impedance bandwidth and CP performance both improve. A truncated corner patch as an NFRP element can generate an additional CP radiation mode and further enhances the axial ratio and impedance bandwidth. The measured results show that the antenna has an impedance bandwidth of 14.2% (833-960MHz), a 3-dB AR bandwidth of 9.0% (846-926MHz), and an average gain of 7.3 dBi over a 3dB AR bandwidth. The proposed antenna has a compact size and a low profile ( 0.45λ×0.45λ×0.074λ).
Original languageEnglish
Article number8478196
JournalIEEE Access
Volume6
Pages (from-to)55883-55892
Number of pages10
ISSN2169-3536
DOIs
Publication statusPublished - Oct 2018

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Antenna feeders
Microstrip antennas
Radio frequency identification (RFID)
Bandwidth
Antennas
Antenna grounds
Radiators
Radiation

Keywords

  • Circular polarization
  • Compact
  • Low profile
  • Modified half E-shaped patch antenna
  • UHF radio frequency identification
  • Vertical rotated metallic plate

Cite this

Li, Junlong ; Liu, Hui ; Zhang, Shuai ; Luo, Miaohui ; Zhang, Yuan ; He, Sailing. / A Wideband Single-Fed, Circularly-Polarized Patch Antenna with Enhanced Axial Ratio Bandwidth for UHF RFID Reader Applications. In: IEEE Access. 2018 ; Vol. 6. pp. 55883-55892.
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abstract = "A wideband single-fed, circularly-polarized patch antenna with enhanced axial ratio bandwidth for RFID reader application is proposed. The antenna consists of a modified half E-shaped patch, a near-field resonant parasitic (NFRP) patch, and four rotated vertical metallic plates on the ground plane. The metallic plates surrounding the main radiator of the modified half E-shaped patch antenna are fabricated vertically on the ground plane. The operating frequency of the antenna decreases substantially with the vertical metallic plates, which is important for miniaturization of RFID applications. With an elliptical slot and a cut on the modified half E-shaped patch, antenna impedance bandwidth and CP performance both improve. A truncated corner patch as an NFRP element can generate an additional CP radiation mode and further enhances the axial ratio and impedance bandwidth. The measured results show that the antenna has an impedance bandwidth of 14.2{\%} (833-960MHz), a 3-dB AR bandwidth of 9.0{\%} (846-926MHz), and an average gain of 7.3 dBi over a 3dB AR bandwidth. The proposed antenna has a compact size and a low profile ( 0.45λ×0.45λ×0.074λ).",
keywords = "Circular polarization, Compact, Low profile, Modified half E-shaped patch antenna, UHF radio frequency identification, Vertical rotated metallic plate",
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A Wideband Single-Fed, Circularly-Polarized Patch Antenna with Enhanced Axial Ratio Bandwidth for UHF RFID Reader Applications. / Li, Junlong; Liu, Hui; Zhang, Shuai; Luo, Miaohui; Zhang, Yuan; He, Sailing.

In: IEEE Access, Vol. 6, 8478196, 10.2018, p. 55883-55892.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Zhang, Yuan

AU - He, Sailing

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