A dual-band WiFi printed dipole antenna is presented in this paper, the PCB size is 7 mm × 45.9 mm × 1 mm. This long and narrow PCB antenna will be applied to the wireless AP and has the omni-directional radiation pattern. This double-sided antenna uses parasitic capacitance and U-shaped microstrip line to match and control the bandwidth to reduce the sensitivity of gate size between the ground and radiator of a dipole antenna. This antenna only has the low frequency bandwidth 2.36 ～ 2.75 GHz (390 MHz, 15.5%) and the high frequency bandwidth 4.90 ～ 5.83 GHz (930 MHz, 17.0%), these bands meets the applications of WiFi communication. The simulation results of the return loss, pattern, pattern and current distribution will be presented in this paper by using the software of Ansoft HFSS.
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