Dual-polarized elliptic-H slot-coupled patch antenna for 5G applications

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Miran E. A., ÇİYDEM M.

TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES, vol.30, no.4, pp.1204-1218, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 30 Issue: 4
  • Publication Date: 2022
  • Doi Number: 10.55730/1300-0632.3844
  • Journal Name: TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Applied Science & Technology Source, Compendex, Computer & Applied Sciences, INSPEC, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.1204-1218
  • Keywords: Dual-polarization, slot coupling, isolation, low profile, broadband patch antenna, sub-6 GHz, 5G, base station antenna, WIDE-BAND, MAGNETOELECTRIC DIPOLE, MICROSTRIP ANTENNA
  • Middle East Technical University Affiliated: Yes

Abstract

A dual-polarized, slot-coupled dielectric patch antenna design is presented in sub-6 GHz for 5G base stations. Proposed antenna is implemented using two dielectric patch layers (main patch and parasitic patch) above a feeding line layer. Excitation is realized by crossed elliptic-H slots in order to create orthogonal +/- 45 degrees polarizations. Through the use of patches at proper heights together with elliptic-H slots, significant improvement in impedance bandwidth, matching level, isolation and front-to-back ratio is acquired. Prototype antenna has an impedance bandwidth of 18.5% (3.23-3.85 GHz) for vertical bar S-11 vertical bar, vertical bar S-22 < - 15 dB, covering the 5G spectra of 3.30-3.80 GHz. The isolation between ports (vertical bar S-21 vertical bar) is obtained as < - 25 dB in desired operating band. Antenna exhibits stable, broadside radiation patterns with half power beam-widths of 59 degrees-64 degrees and 69 degrees-72 degrees. in E/H-planes, respectively. Gain of the antenna varies within the range of 7.9-8.4 dBi. Proposed antenna is also low profile (9.8 mm). It needs no reflector or cavity-backed structure and meets all the requirements of 5G base stations as an antenna element. Design details, numerical studies, and experimental results are presented.