A highly linear active mixer is introduced for IEEE 802.11 applications. It uses a new technique to remove the common mode currents in all frequencies. In zero-IF receivers, IIP2 is the most important parameter which shows the output's IM2 nonlinearity. In this paper, IIP2 improves more than 17 dBm by removing its common mode current. Also, the new technique, improves IIP3 more than 5dBm in comparison with a simple Gilbert-Cell mixer at equal conversion gain. These are achieved at the cost of 0.8 dB increase in NF and 0.6 mA more current dissipation. Simulations are performed in a 90 nm RF-CMOS technology by HSPICE-RF.