Square annular-ring antenna with circular polarization for UHF RFID reader

Wang Ik Son, Hyun Sung Tae, Sang Bo Min, Moon Que Lee, Jong Won Yu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


A square annular-ring antenna with circular polarization (CP) for ultra-high-frequency (UHF) radio frequency identification (RFID) reader is presented. The proposed annularring antenna is composed of square-shaped annular-ring radiator, which is fed by four equal amplitude signals with 90° phase difference, and reflector suspended below the radiator. The proposed antenna is matched and optimized using the 4-port antenna matching condition. Experimental results show that the proposed antenna of size 200 × 200 × 11 mm 3 has the peak gain of 7.0 dBic at 915 MHz, front-to-back ratio (F/B) of 30.0 dB, axial ratio under 1.5 dB.

Original languageEnglish
Title of host publicationAsia-Pacific Microwave Conference Proceedings, APMC 2011
Number of pages4
StatePublished - 2011
EventAsia-Pacific Microwave Conference, APMC 2011 - Melbourne, VIC, Australia
Duration: 5 Dec 20118 Dec 2011

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


ConferenceAsia-Pacific Microwave Conference, APMC 2011
CityMelbourne, VIC


  • RFID reader antennas
  • Square annular-ring antenna
  • circular polarization


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