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A wideband single-fed, circularly-polarized patch antenna with enhanced axial ratio bandwidth for UHF RFID reader applications
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2018 (English)In: IEEE Access, Vol. 6, p. 55883-55892, article id 8478196Article in journal (Refereed) Published
Abstract [en]

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% (833-960 MHz), a 3-dB AR bandwidth of 9.0% (846-926 MHz), and an average gain of 7.3 dBic over a 3-dB AR bandwidth. The proposed antenna has a compact size and a low profile (0.45λ 0 × 0.45λ 0 × 0.074λ 0 ). 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc. , 2018. Vol. 6, p. 55883-55892, article id 8478196
Keywords [en]
Circular polarization, Compact, Low profile, Modified half E-shaped patch antenna, UHF radio frequency identification, Vertical rotated metallic plate, Antenna feeders, Antenna grounds, Bandwidth, Electric impedance, Metals, Mobile antennas, Radio frequency identification (RFID), Slot antennas, Half E-shaped patch antennas, Low-profile, Metallic plate, Uhf radio frequency identifications, Microstrip antennas
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246575DOI: 10.1109/ACCESS.2018.2872692ISI: 000448298800001Scopus ID: 2-s2.0-85054410826OAI: oai:DiVA.org:kth-246575DiVA, id: diva2:1318838
Note

QC 20190528

Available from: 2019-05-28 Created: 2019-05-28 Last updated: 2019-05-28Bibliographically approved

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CiteExportLink to record
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  • apa
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