volume | PIER Journals

Abstract

This paper presents the design and implementation of a compact 4-port antenna element with high isolation for 5G sub-6 GHz applications. Four V-shaped patch elements are arranged orthogonally on a 1.58 mm thick FR4 substrate to mitigate mutual coupling in the proposed structure. A defected ground plane method is utilized to further enhance and optimize the characteristics of the antenna at the operating frequency. The antenna operates in the 3.15-4.1 GHz frequency range, providing a 950 MHz impedance bandwidth at -10 dB, making it suitable for mobile terminals within the 5G sub-6 GHz band. The orthogonal polarization results in isolation levels below -18.1 dB, making the antenna ideal for 5G handset communications. This high isolation is reflected in an envelope correlation coefficient (ECC) of less than 0.04, while the diversity performance is verified by a total active reflection coefficient (TARC) of less than -10 dB. The channel capacity loss (CCL) of the four-port antenna element is calculated to be below 0.1 bps/Hz at 3.5 GHz. The MIMO antenna was fabricated, and its measured performance closely matches the simulated results, confirming that the proposed MIMO antenna is well-suited for future sub-6 GHz cellular communications.

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Dr. Aziz Dkiouak

Dr. Alia Zakriti

Dr. Mostafa Hefnawi

Dr. Saad Chakkor

Dr. Khalid El Khadiri