Microstrip patch antenna arrays are proposed for wireless communication applications. In this paper, a three element antenna array with high performance characteristics is presented for the application of Wireless Local Area Network (WLAN). The antenna array is designed on FR-4 substrate. Maximum gain of antenna array is obtained by adjusting the thickness of dielectric substrate and the geometry of array structure. Greater the number of radiating elements, better the gain of antenna array would be realized. The array design is operated at the frequency of 3.4GHz.