High Isolation Low Profile MIMO Antenna for 5G Applications

This article focuses on the multi-input multi-output (MIMO) antenna with smaller dimensions and improved isolation between the ports which results in good performance and is suitable for modern wireless communication systems, especially USB dongle and 5G mobile applications. Two main problems with the conventional antennas are (i) Large height between the top to ground plate and (ii) Smaller isolation between the ports. These two problems are carefully addressed in the proposed design. The height in the proposed antenna is minimized up to 4mm between the top and to ground plate. Further achieved isolation is more than -18dB by introducing a novel type of periodic slots in the ground plate of the antenna. The antenna structure consists of a ground plate and two top plates, each with defined dimensions. The parameters are optimized using software for the best performance of the antenna to ensure efficient signal transmission and reception. The proposed antenna aims to explore the impact of dimension parameters like impedance matching and fractional bandwidth and isolation between the ports. The antenna resonates for 4.5GHz to 5.75GHz frequency bandwidth. The return loss for impedance bandwidth is below -20dB. The antenna is simulated on software and fabricated on substrate FR4. The simulated and measured results are compared which indicates that this antenna with high isolation and good impedance bandwidth is a more suitable candidate for 5G mobile applications. Compared to the conventional same-class antenna, the proposed antenna has good performance with minimized dimensions.