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This work presents a new approach to design a multiband 5G based microstrip antenna array using EBG structure. A 5*2 matrix array has been realized on Rogers 5880 dielectric substrate. To improve the return loss characteristics of the radiating patch and having multiband operation, defected ground structure is analyzed. Further improvement in performance metrics like directivity, a suitable EBG structure is used in the radiating structure. Various parameters like radiation pattern and VSWR are studied in detail. The overall return loss of the antenna array is found to be -15 dB and -16 dB at 28 GHz, 37.51 GHz respectively. Also with the introduction of EBG layer the directivity is observed to improve to 8.4dBi and 12dBi at 28GHz and 37.5GHz respectively.

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