Micro-strip antenna (MPA) arrays are explored to achieve higher gain and improved bandwidth (BW), which is preferred for WLAN applications. In this paper, multi slot 2x2 single port micro strip patch antenna array are designed and simulated. The target frequency range is at S-band with frequencies that range from 2 to 4 GHz. This paper investigates 2x2 single port antenna arrays within multi slot techniques for improved BW. It proposes a new single port 2x2 micro-strip patch antenna array with double square T slots having significant improvement of BW. The result shows that the proposed antenna array has fractional bandwidth of 30% and antenna gain is 7.34 dBi at the resonance frequency of 2.41 GHz. The design and simulation of this antenna has been performed with the help of CST Studio 2011.Keywords: Directivity, Radiation pattern, Array, S-parameter, WLAN, Linear array, Square array
