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Abstract-Monopole antenna is one of the famous low-profile antennas because of its features of light in weight and easy to install. However, it can only be operated in lower gain and bandwidth due to the easiness of noise affecting. As other types of antenna, monopole antenna uses perfectly electrical conducting plane (PEC) as its ground plane which are made by a printed circuit board (PCB). PCB is well-known with its disadvantages in terms of bandwidth, loss, and gain. Thus, in order to enhance the performance of a monopole antenna, it is good if the radiation's part is undisturbed in order to maintain the antenna's features, while only at the ground is focused. In this project, a structure with arrays of protrusions instead of flat plate that is commonly used on most ground plane will be developed. This structure is called as High Impedance Surface (HIS) ground plane. It has been proved that a corrugated metal surface (protrusions) where the corrugations are folded up into lumped-circuit elements can have high impedance value on the surface. HIS is believed to eliminate the surface waves which reduce the power radiation as well as the efficiency. Therefore, the bandwidth frequency can be enhanced and antenna's performance can be improved. In this report, some specifications such as length of antenna, width, and others required parameters are shown. These parameters are used to remodel the ground plane of the antenna according to the desired one where it can operate in lower frequency but still can perform well in term of higher bandwidth and efficiency of transmission.

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