Abstract: An analysis of a compact patch antenna with a shorted wall is proposed for dual band operation in this study. The proposed antenna covers 2.45 GHz bands with two resonances that are caused by the L slot and the dimension of the shorting wall. In the 2.4 GHz band, the antenna achieves a bandwidth of 150 MHz (2.37-2.52 GHz) or about 6.1% for the center frequency of 2.45 GHz and in the 5 GHz band, antenna shows a bandwidth of 1100 MHz (4.97-6.07 GHz) or about 19.9% for the center frequency of 5.52GHz. The gains across the frequency bands are found to be considerable high in the operating bands. The antenna is prescribed for the multi-band application of Wireless Local Area Network (WLAN) in IEEE 802.11a/b/g.