Compact circularly polarized asymmetric-slotted microstrip patch antennas

Nasimuddin*, Zhi Ning Chen, Xianming Qing

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


A technique is demonstrated to generate circularly polarized (CP) radiation of the compact diagonally asymmetric-slotted microstrip patch antennas. Design rules for the single-feed, compact, circularly polarized microstrip antennas (CPMA) with any arbitrary-shaped slots along the diagonal directions are first summarized. Four, compact, CPMA with circular-, square-, cross-, and square-ring-shaped slots along the diagonal directions are proposed and compared based on a fixed overall antenna size. A compact, CP, cross-shaped slotted, microstrip antenna is fabricated and measured to verify the proposed technique experimentally. The measured 3-dB axial-ratio bandwidth of about 6.0 MHz is achieved with 10-dB return loss bandwidth of 19.0 MHz while measured gain of the antenna is 4.0 dBic at 930 MHz.

Original languageEnglish
Pages (from-to)1920-1927
Number of pages8
JournalMicrowave and Optical Technology Letters
Issue number8
Publication statusPublished - Aug 2012
Externally publishedYes


  • asymmetric-structure
  • circularly polarized
  • compact microstrip antenna
  • RFID
  • slotted microstrip patch


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