Novel Broadband Monopole Antennas With Dual-Band Circular Polarization

Christina Jou, Jin-Wei Wu, Chien-Jen Wang

Research output: Contribution to journalArticlepeer-review

113 Scopus citations


Novel broadband monopole antenna designs with dual-band circular polarization (CP) are presented. The proposed antenna comprised of a ground plane embedded with an inverted-L slit, which is capable of generating a resonant mode for broadband impedance-bandwidth, and excites two orthogonal E vectors with equal amplitude and 90 degrees phase difference (PD) for radiating left-hand circular polarization (LHCP) at 2.5 GHz and right-hand circular polarization (RHCP) at 3.4 GHz. A bevel is cut in the rectangular radiator to increase the impedance-bandwidth. The measured result of the impedance-bandwidth is about 4.46 GHz from 2.12 to 6.58 GHz; the 3-dB axial ratio (AR) bandwidths are about 150 MHz at the lower band (2.5 GHz) and 230 MHz at the upper band (3.4 GHz). Furthermore, embedding an I-shaped slit in the rectangular radiator and adding an I-shaped stub in the ground plane, the impedance-bandwidth can be further increased to 6.30 GHz (2.17-8.47 GHz), and the 3-dB AR-bandwidth at the upper band is greatly enhanced from 230 to 900 MHz.
Original languageEnglish
Pages (from-to)1027-1034
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Issue number4
StatePublished - Apr 2009


  • Axial ratio (AR)
  • broadband antennas
  • monopole antennas
  • circular polarization (CP)

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