volume | PIER Journals

Abstract

In the present work, a dual-band four-port multiple-input multiple-output (MIMO) antenna based on an FR4 substrate is designed, which can work in the frequency bands of 5G n256/n77/n78/n79 and 6G system. The MIMO antenna is composed of four orthogonally placed monopole antennas. Multiple sets of L-shaped branches and cross-shaped branches are added to improve the isolation among the antenna elements. The measured isolation is below -20 dB, and most of them can reach -30 dB within the operational frequency spectrum. The actual measurement results reveal that the two impedance bandwidths of the antenna are 420 MHz (1.95-2.37 GHz) and 4050 MHz (3.2-7.25 GHz), respectively, which can encompass the n256 band for 5G-6G satellite technologies (1.98-2.01 and 2.17-2.2 GHz), 5G n77/n78/n79 (3.3-4.2/3.3-3.8/4.4-5.0 GHz) and 6G band (6.425-7.125 GHz). At the same time, the antenna features a peak gain of 7.4 dB. The ECC value is below 0.0015, while the DG value exceeds 9.9999, showing good diversity performance. The data reveal that the designed dual-band quaternary MIMO antenna has good applications in the fields of 5G satellite communication and 6G systems.

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Dr. Fanran Zhang

Professor Chengzhu Du

Dr. Xu Wu