Metamaterials is a lefthanded media which can be applied in antenna application to overcome the traditional design which is bigger in size and untunable. Wireless industry could overcome this problem since metamaterial antenna is design with high permittivity dielectric substrate, using shorting well, shorting pins and some deformation. Furthermore, antenna design not only reduces in the size, but have high directivity, tunable frequency and high performance to solve those aforementioned problems. Metamaterials antenna consists of hundred features which tunable to catch signal coming from any direction. This study proposed different structures of metamaterials using plasma to enhance its capability by using Computer Simulation Technology (CST) simulation software. The aims are to analyze and compare antenna performance of the different type structure in terms of return loss, gain, radiation pattern, and to investigate antenna performance of different plasma in terms of its plasma properties. This study used four different metamaterials structures namely split ring structure, Symmetrical structure, Omega structure and S structure. There are 12-type of plasma conditions labeled with form Plasma A to L, with different plasma frequency and collision frequency. These materials were simulated using CST to calculate their return loss, gain and radiation pattern, in order to identify the best antenna performance condition. Split ring structure has the highest return loss at -74.8 dB (Plasma D) while S structure give the best antenna gain at 7.9 dB (Plasma F). This is thought due to the electromagnetic properties in the split ring structure, and the high collision and plasma frequencies of plasma in S structure. However, considering all of the antenna parameters (return loss, gain radiation pattern) split ring structure with Plasma F type gave the best result.