Plasma antenna is an antenna using ionized gas instead of metal as its conducting element. Plasma can be formed by energizing glass tubes which are filled with neutral gases. The main objective of this study is to investigate the effect of different gases, pressures and materials of coupling sleeve on antenna parameters of plasma antenna. Previous studies concentrate on using commercial fluorescent tube with unknown pressure as plasma antenna, and plasma ionization method using electroded

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... rge. This study investigates the parameters of plasma antenna with 4 different gases (neon, argon, argon-nitrogen and argon-mercury (fluorescent lamp)), 3 different pressures (1, 5, 10 Torr) and 2 different materials (copper and aluminium) for coupling sleeve. In this research, the simulation approach was conducted. The plasma tubes with constant length and diameter but different gas, pressures and coupling sleeve were designed. Actual tubes were used and energized using Dielectric Barrier Discharge (DBD) method in order to calculate plasma parameters. DBD was used as it can improve discharge lifetime. Antenna parameters were simulated using Computer Simulation Technology (CST) software with the resonance frequency is design in a ranged from 1 GHz to 10 GHz. Simulation results show that Ar (5 Torr) with aluminium coupling sleeve has the best performance in term of return loss by having the best value at-43.69894 dB. In terms of directivity and parameters, fluorescent tube with copper coupling sleeve has the highest value compared to others, which is 3.376 dBi and 3.3 dB, respectively. The variation type of gas, pressure and coupling sleeve material gives different performance of plasma antenna.