A Microstrip Patch Antenna with High Gain Dual Bands for secure 5G communication is presented in this research. The major goal is to utilize a wide bandwidth antenna operating in the 28/38GHz millimetre-wave band to obtain a high data throughput. An L-shaped, high-gain microstrip patch antenna is the subject of this research. Rogers RT Duroid 5880 has a relative permittivity constant of 2.2, an angular loss of 0.0009, and a 0.508mm thickness. The substrate for the format isAnsysHFSS software serves as the simulation basis. At 27.84GHz and 39.5GHz, respectively, the concept produced a gain of up to 8.33dB and 7.9dB. At the corresponding resonant frequencies below the parameters'-10dB line, the impedance bandwidth responses of 1.5 and 4.37GHz are attained. It is recommended to use a small antenna with the following dimensions: 3.2 4.9 0.508; this antenna offers High Gain and Bandwidth at both bands. Some of the crucial design factors Voltage Standing Wave Ratio (VSWR), gain, and return loss are also properly examined. The suggested antenna has a strong operating band performance, which qualifies it for secure 5G communication. © 2023 Elsevier B.V., All rights reserved.