Octa-Port MIMO Antenna System for 5G Smartphone Applications

This paper presents an octa-port MIMO antenna system for applications of the smartphone. A single element consists of an L-shaped patch and a partially defected ground system (DGS). The operating frequency of the proposed compact antenna is 28 GHz, offering a 10-dB impedance bandwidth of almost 4 GHz without using any decoupling structures and maintaining a compact size of $37.7 \times 90.3\text{mm}^{2}$. The MIMO parameters of the stated system fall within the required range, certifying that the device is a suitable candidate for 5G applications.