Dual-Polarization Wideband Sub-6 GHz Suspended Patch Antenna for 5G Base Station

Ciydem M., Miran E. A.

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, vol.19, no.7, pp.1142-1146, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 7
  • Publication Date: 2020
  • Doi Number: 10.1109/lawp.2020.2991967
  • Journal Name: IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.1142-1146
  • Keywords: Metals, Probes, Feeds, Antenna measurements, Patch antennas, 5G mobile communication, 5G, base station, dual polarization, isolation, modified L-probe, suspended patch antenna (SPA), wideband
  • Middle East Technical University Affiliated: Yes

Abstract

This letter presents a simple, compact, low-cost, low-profile, dual-polarization, suspended patch antenna design to operate in 3.3-3.8 GHz band for 5G base stations. The proposed antenna comprises a main radiating patch, a secondary parasitic patch, modified L-probe feeds, and a vertical metal wall. The main patch is capacitively driven by two feeds for dual (+/- 45 degrees slant) polarization. The vertical metal wall is used to increase the port isolation. The parasitic patch also helps further improvement of input impedance matching (|S-11|, |S-22|) and port isolation (|S-21|). The prototyped antenna has |S-11|, |S-22| < -10 dB and |S-11|, |S-22| < -15 dB impedance bandwidth of 45% and 36%, respectively. Port isolation is |S-21| < -30 dB in the desired operating band. Stable and symmetric radiation patterns with half-power beamwidths of 56 degrees-65 degrees are obtained in E-/-H-planes. The gain of the antenna is 8.95 +/- 0.25 dBi. Numerical calculations and experimental results are reported and discussed.