A Wideband Series-Fed Circularly Polarized Differential Antenna by Using Crossed Open Slot-Pairs

L. Wen, S. Gao, Q. Luo, Q. Yang, W. Hu, Y. Yin, J. Wu, X. Ren

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A novel method of designing a wideband series-fed circularly polarized (CP) differential antenna by using crossed open slot pairs is presented in this article. The near-field distributions and input impedance analyses show that the closely spaced open slot-pairs can radiate as the crossed dipoles and have stable radiating resistance with a compact radiator size. Besides, a wideband half-power phase shifter using open slot is proposed and utilized to realize CP radiation. The proposed CP antenna is composed of a wide slot-pair and a narrow slot-pair. In the antenna design, the narrow slot-pair is not only excited as a radiator, but also elaborately loaded to provide wideband half-power output and quadrature phase excitation to the wide slot-pair. Both the proposed half-power phase shifter and CP antenna are illustrated by the corresponding equivalent circuits. Based on these analyses, the proposed antenna is designed, fabricated, and measured. Compared with the simulated traditionally designed counterpart, 2.1 times wider axial ratio (AR) bandwidth is achieved for the proposed antenna. The measured overlapped bandwidth for AR < 3 dB and return loss >10 dB is 1.95-3.45 GHz (55.6%). Also, the antenna gain and radiation patterns are measured, which agree well with the simulated results.

Original languageEnglish
Article number8936548
Pages (from-to)2565-2574
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Issue number4
Publication statusPublished - Apr 2020


  • Circularly polarized (CP) antenna
  • differential antenna
  • series-fed
  • wideband antenna


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