Rahayu, Y., and M. Andika. “Dualband Microstrip Elliptic Patch 1x4 MIMO Antenna Design for 5G System Device ”. International Journal of Electrical, Energy and Power System Engineering, Vol. 4, no. 2, June 2021, pp. 154-8, doi:10.31258/ijeepse.4.2.154-158.