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Bidirectional radiated circularly polarised square-ring antenna for portable RFID reader

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4 Author(s)
Lin, Y.-F. ; Inst. of Photonics & Commun., Nat. Kaohsiung Univ. of Appl. Sci., Kaohsiung ; Chen, H.-M. ; Chu, F.-H. ; Pan, S.-C.

A novel single-layer, dual-fed technique for a bidirectional radiated circularly polarised square-ring antenna operated in the UHF band is presented. The two feed ports of the square-ring radiating element are placed in orthogonal directions and connected to a feeding network with a Wilkinson power divider in the same plane. Properly adjusting the size of the capacitive coupling groundplane results in good impedance matching and circularly polarised radiation, and a broad impedance bandwidth (S 11 les -10 dB) of about 45.2% and a 3 dB axial-ratio bandwidth of about 8.7% were obtained.

Published in:

Electronics Letters  (Volume:44 ,  Issue: 24 )