Dual-square-ring-shaped slot antenna for wideband circularly polarized radiation

Nasimuddin*, Xianming Qing, Zhi Ning Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


A compact dual-square-ring-shaped slot antenna using a microstrip feed line is proposed for wideband circularly polarized (CP) radiation. The antenna consists of a combined dual-square-ring-shaped slot along the diagonal direction and a microstrip feed-line along with stub in the orthogonal direction. The slot and feeding structures are fabricated on the opposite planes of a low cost FR4 substrate. The stub width and a dual-square-ring-shaped slot are optimized for wideband CP radiation with good impedance matching. The measured 3-dB axial ratio and 10-dB return loss bandwidths of the proposed antenna are 47% (2.1-3.4 GHz) and 75% (1.92-4.25 GHz), respectively. The measured gain is more than 2.0 dBic over the 3-dB axial ratio bandwidth.

Original languageEnglish
Pages (from-to)2645-2649
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number11
Publication statusPublished - Nov 2014
Externally publishedYes


  • circular polarization
  • circularly polarized antenna
  • microstrip feed-line
  • slot
  • slot antenna
  • wideband


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