Circularly polarized dodecagonal patch antenna with polygonal slot for RFID applications

Karavilavadakkethil Chellappan Prakash, Sumitha Mathew, Ramachandran Anitha, Puthiyapurayil Viswanathan Vinesh, Methapettyparambu Jayakrishnan, Pezholil Mohanan, Kesavath Vasudevan

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11 Citations (Scopus)


This paper presents a compact 2.45 GHz single feed directional circularly polarized (CP) microstrip antenna for radio frequency identification (RFID) applications. The proposed antenna comprises a dodecagonal microstrip patch embedded with an irregular polygonal slot, fabricated on an FR4 substrate. Two antennas, one with right-handed circular polarization (RHCP) and the other with left-handed circular polarization (LHCP), both resonating at a frequency of 2.45 GHz are presented. The measurement results show a 3 dB axial ratio bandwidth of 5.5%, a 10 dB impedance bandwidth of 5.7% for both the antennas, a peak gain of 4.82 dBi for RHCP antenna and 4.67 dBi for LHCP antenna. In addition, the antennas provide symmetrical patterns with 88˚ half-power beam width. The overall size of the antenna is 50 mm × 50 mm × 1.6 mm and offers an area reduction of 21.17%.
Original languageEnglish
Pages (from-to)9-15
Number of pages7
JournalProgress in Electromagnetics Research C
Publication statusPublished - 2016


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