ABSTRACT
The article proposed the 5G millimeter antenna for mobile devices in the smart city. The method of calculating the antenna parameters is described and explained using empirical formulas. Then, using CST Microwave Studio, the antenna can be modeled. The proposed antenna with 4.0×7.0×0.07mm3 and the impendence matching bandwidth 1.3GHz (4.8%) can operate from 26.4GHz to 27.7GHz within the 5G NR FR2 and the total efficiency is -2.4dB (55.0%). The final performance of the patch antenna is stated in this paper. As a result of the low directivity, it is suitable for mobile devices required to receive and send signals in broad directions, such as mobile phones. In addition, the effect of different patch widths, patch lengths and slot lengths are analyzed, and it can be observed that adjusting the length slots can get the minimum ∣S11∣ through a significant variation. Furthermore, changing the patch dimension would significantly influence the cross-polarization, which can be further developed in the future to have a higher energy efficiency of the proposed antenna.
