Abstract: In this study, a printed dual band antenna for WLAN applications is presented. The proposed and developed antenna consists of microstrip line fed triangular patch with partial Koch fractals. Introduction of partial Koch fractals in designed triangular patch results in the antenna with improved return loss (34.43 dB at 5.18 GHz and 38.90 dB at 5.78 GHz) and high gain (5.12 dB at 5.18 GHz and 5.85 dB at 5.78 GHz). The dual band frequency operation is achieved by loading one pairs of narrow slots on one side of an equilateral triangle. The overall dimension of the antenna is 25.6×18.1×1.6 mm3. The measured result shows that the proposed antenna would cover two different-10-dB impedance bandwidths of 160 MHz (5.08-5.24 GHz) and 220 MHz (5.68-5.9 GHz), necessary for dual band IEEE 802.11a WLAN applications.