A Two-Element Microstrip Antenna 28/38 GHz for 5G Mobile Applications

A two-element antenna system is introduced with good isolation in this manuscript. The offered °G antenna gets two resonance frequencies at 28/38 GHz. The offered antenna is designed and simulated using industry-standard software CST MWS program. The elementary antenna is conventional microstrip antennas placed at the end of the mobile handset. The obtained reflection coefficient is -27.908 dB from (26.961 - 29.266) GHz with impedance bandwidth of 8.19 % and -20.58 dB from (36.646 - 40.297) GHz with impedance bandwidth of 6.09%. The two ports are coupled with less than -30 dB. The achieved directivity, far-field gain, and efficiency are 7.581 dB_i, 7.182 dB_i and 91.24 % at 28 GHz and 9.716 dB_i, 9.24 dB_i and 89.63 % at 38 GHz, respectively. The size of the Rogers 5880 substrate is 55 × 115 mm² with h = 0.508 mm and E r =2.2 which is a low-cost substrate and small size patches best suited for miniaturized devices.