Abstract: An improved low cost multi-band shorted planar monopole antenna with a bevel is presented for wireless local area network(WLAN).Two parasitic elements at the top of the antenna can not increase the height of antenna and can widen bandwidth.Compared with conventional monopole antenna,this antenna can produce wider frequency bandwidth by adding L-type slot in vertical radiation element. The simulated bandwidths for the lower and upper bands are able to cover the whole WLAN.In addition,good omnodirectional radiation characteristic over the operating bands are obtained.The measurement and simulation results are in good agreement,which validates the proposed design.