A Wideband circularly polarized MIMO Antenna for 5G Millimeter Wave Applications

Document Type : Original Research Papers

Authors

1 Electrical engineering, benha faculty of engineering, benha university

2 Benha Faculty of Engineering, Electrical Engineering Department, Benha, Egypt.

Abstract

This study presents a broadband, circularly polarized millimeter-wave four-port multiple-input–multiple-output (MIMO) antenna design featuring enhanced performance attributes. The MIMO antenna structure comprises four monopole elements with a common ground. Simulated on a Rogers RT5880 substrate with dimensions 25 mm × 31 mm and a thickness of 1.575 mm, the antenna demonstrates excellent characteristics. The MIMO achieves a high impedance bandwidth of 21.5 to 45 GHz, a wide 3-dB axial ratio bandwidth (ARBW) of 23.5 to 30.7 GHz, covering critical frequencies such as 28 GHz, and exhibits high isolation with S21 < -20 dBi. The axial ratio bandwidth (ARBW) and peak gain (8.5 dBi) are enhanced, and the MIMO performance is greatly improved by adding parasitic elements in between the MIMO elements. Massive MIMO can be constructed using an eight-port from the same monopole antenna. The compact size and simplified fabrication process make this antenna design a promising solution for demanding ultra-wideband communication scenarios and 5G millimeter-wave applications.

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Benha Journal of Applied Sciences
Volume 10, Issue 4 - Serial Number 4
Engineering Sciences
April 2025
Pages 161-173

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