A novel approach is presented to increase the realized gain for millimeter wave applications at 28 GHz using metamaterial (MTM) profile based antennas. The concept of epsilon-negative medium (ENG) and double negative medium (DNG) is analyzed to have metamaterial corrugations instead of sine corrugations. In this paper, the antipodal Fermi based tapered slot antenna (AFTSA) is analyzed using metamaterial corrugations which allow a total gain greater than 14 dB in the H-plane for a frequency range of 24–30 GHz. The extraction of effective parameters of a metamaterial unit cell is also presented depicting its ENG and DNG behavior. The antenna is also analyzed using the practical model of a 2.92 mm connector, thereby showing the effect of end launch connectors on the millimeter wave frequency range.