A Low-Profile Hybrid-Fed Dual-Polarized Antenna with High Isolation and High Cross-Polar Discrimination


ÇİYDEM M., Miran E. A.

APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL, vol.36, no.9, pp.1164-1172, 2021 (Peer-Reviewed Journal) identifier

  • Publication Type: Article / Article
  • Volume: 36 Issue: 9
  • Publication Date: 2021
  • Doi Number: 10.47037/2021.aces.j.360907
  • Journal Name: APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, Compendex, DIALNET
  • Page Numbers: pp.1164-1172
  • Keywords: 5G base station, cross-polar discrimination, dual-polarization, hybrid feeds, isolation, low-profile, massive MIMO, sub-6 GHz, wideband patch antenna, FED PATCH ANTENNA, WIDE-BAND, FEED

Abstract

This work presents a wideband hybrid-fed +/- 45 degrees linear dual-polarized patch antenna design for sub-6 GHz 5G base stations. Two polarizations are created by a slot-coupling with rectangular H-slot (+45 degrees) and a capacitive coupling with modified L-probe (-45 degrees). Antenna exhibits wideband-10 dB impedance bandwidths of 40.7% and 35.6% for slot-fed and probe-fed ports, respectively. Due to the special design of suspended stacked patches with hybrid-fed excitations, high port isolation (< -47 dB) and high cross-polar discrimination (> 38 dB) are achieved. Symmetric and directional radiation patterns with stable gain are obtained in E and H planes for each polarization. Compared to its bandwidth, antenna is low-profile (10.6 mm) with front-to-back ratio greater than 22 dB. Simulations and experimental results are reported and discussed.