Broadband Electrically Small Circularly Polarized Directive Antenna

Son Xuat Ta, Ikmo Park, Richard W. Ziolkowski

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


A broadband electrically small antenna with directive circularly polarized radiation is presented. It is composed of a compact single-feed crossed dipole driver, which is backed by a near-field resonant parasitic (NFRP) reflector to achieve the directive radiation pattern. The NFRP reflector is designed to generate extra resonances and minimum axial ratio (AR) points in the antenna system. These features are combined with those resulting from the driver to broaden the operational bandwidth. The proposed antenna was fabricated and measured. The antenna prototype, with a low profile (0.066 λo at 1.45 GHz) and an electrically small size (ka = 0.71 at 1.45 GHz), has a measured S11<-10 dB bandwidth of 25.66% (1.362-1.763 GHz) and a 3-dB AR bandwidth of 10.56% (1.390-1.545 GHz). Additionally, the measurements resulted in a broadside gain of 2.31 ± 0.4 dBic and an average radiation efficiency of 80% within the operational bandwidth.

Original languageEnglish (US)
Article number7987698
Pages (from-to)14657-14663
Number of pages7
JournalIEEE Access
StatePublished - Jul 21 2017


  • Broadband
  • circular polarization
  • crossed dipole
  • directive radiation
  • near-field resonant parasitic reflector
  • small antenna

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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