A Dual Layered Loop Array Antenna for Base Stations with Enhanced Cross-Polarization Discrimination

Can Ding, Hai Han Sun, Richard W. Ziolkowski, Y. Jay Guo

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


This paper presents a novel dual-loop array antenna targeted at current and future base station applications. The antenna has four rectangular loops and four trapezoidal loops printed on the front and back sides, respectively, of a substrate placed above a flat square reflector. All eight loop radiators are excited simultaneously with properly designed feed networks to achieve its ±45° polarization states. The trapezoidal loops act like folded (electric) dipoles; the rectangular loops act primarily as magnetic dipoles. The combination of these two loop arrays leads to a type of magnetoelectric loop antenna that has stable directivity patterns with high cross-polarization discrimination (XPD) values across a 45.5% operational fractional bandwidth from 1.7 to 2.7 GHz. A fabricated and measured prototype confirms the simulation results and demonstrates that the half-power beamwidths in the horizontal plane vary between 63° and 70°, the XPD values are >20 dB in the boresight direction, and are >10 dB within the entire cellular coverage angular range:-60 θ 60°.

Original languageEnglish (US)
Article number8457319
Pages (from-to)6975-6985
Number of pages11
JournalIEEE Transactions on Antennas and Propagation
Issue number12
StatePublished - Dec 2018


  • Antenna array
  • ME array
  • base station antenna
  • cross-polarization discrimination (XPD)
  • dual-polarization
  • loop antenna
  • magnetoelectric (ME) antenna

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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