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- Title
Single-fed broadband circularly polarized unidirectional antenna using folded plate with parasitic patch for universal UHF RFID readers.
- Authors
Dentri, Sitthichai; Phongcharoenpanich, Chuwong; Kaemarungsi, Kamol
- Abstract
ABSTRACT This research proposes a simple economical broadband circularly polarized antenna for universal ultra-high frequency (UHF) RF identification (RFID) readers. The antenna utilizes a folded plate, a two-corner truncated parasitic patch, and a ground plane. The folded plate, which is fabricated from one single plate, consists of a two-corner truncated main patch, a wall patch, and a feed line, where the main patch is perpendicular to the wall patch, which is in turn perpendicular to the feed line. The folded plate enables currents to flow with a phase difference. The simulation results achieved an | S11| < −15 dB of 805-966 MHz (18% bandwidth), a 3-dB axial ratio (AR) bandwidth of 834-962 MHz (14% AR bandwidth), and a gain higher than 8.6 dBic. The measured results obtained an | S11| < −15 dB of 806-970 MHz (18%), a 3-dB AR bandwidth of 816-963 MHz (16%), and a gain greater than 7.8 dBic. The proposed antenna is applicable for universal UHF RFID readers as it covers the entire operating UHF RFID frequency range of 840-960 MHz. The parametric study and evolution of the proposed antenna are detailed in this research paper as well. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:575-587, 2016.
- Subjects
RADIO frequency identification systems; UHF antennas; CIRCULAR polarization; BROADBAND antennas; STRUCTURAL plates
- Publication
International Journal of RF & Microwave Computer-Aided Engineering, 2016, Vol 26, Issue 7, p575
- ISSN
1096-4290
- Publication type
Article
- DOI
10.1002/mmce.21004