In this research, a microstrip patch antenna resonating in the 5G mm-wave is designed and compared with the performance of array antennas. This study presents a microstrip patch antenna with a reflection coefficient of -67dB and a gain of 7.6 dB in the resonant frequency of 28 GHz. Rogers RT 5880, which has a dielectric constant of 2.2, has been applied as the substrate in all the simulated designs. Two slots on the antenna’s patch with two circular parasitic elements situated on both sides of the feedline, have burgeoned the overall performance of the antenna. CST Studio Suite has been used to design and simulate the antennas. With the same dimension as the proposed microstrip patch antenna, a 2×2 and a 4×4 antenna array had been designed and evaluated for the comparative study. Furthermore, in contrast with the proposed microstrip antenna, the gain of the array antennas is 13.4 dBi and 15.5 dBi respectively. The array antenna's performance can be enhanced further by extending the number of array elements.