High isolated compact 6-Port MIMO antenna with wideband coverage for 5G NR (n7, n38, n41, n53, n90) applications

Abstract This study presents a novel and compact (1.25 λ r × 1 λ r × 0.02 λ r mm 3 ) 6-port MIMO antenna which comprises three elements (two rectangular concave patches and one elliptical patch) in the radiating plane and an effective isolator made up of an annular ring and rectangular strips in the ground plane. The proposed work has been meticulously investigated in six distinct steps (STEPS (1-6)), ensuring optimal performance across various parameters, and an optimal design STEP-6 is chosen among all six different designs. This work exhibits a fractional bandwidth of 17% (simulated) and 16. 7% (measured) at a resonating frequency of 2.4 GHz in the first frequency band (2.1–2.6 GHz) and 38. 4% (simulated) and 36. 1% (measured) at the center frequency of 2.8 GHz in the second frequency band (2.2–3.3 GHz). A maximum isolation of 40 dB, a peak realized gain of 3.1 dB and a total efficiency of 92%–95% have been obtained. The SAR value of the proposed antenna is also investigated with human body interaction, and SAR values of 0.8, 1.3, and 1.5 W kg −1 have been achieved at 2.4, 2.6, and 3 GHz, respectively. In addition, the MIMO characteristics in terms of ECC and CCL have also been studied, and values of less than 0.04 and 0.5 of ECC and CCL have been obtained. The proposed antenna is suitable for Sub-6 GHz band such as WiFi, Bluetooth, WLAN, RFID, ISM band and wireless applications. The simulated results based on a finite element method are experimentally verified and found in close proximity.