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Abslroct -A compact 5 x 6 x 1.4 mm3 2.4 GHz Wireless LAN (WLAN) front-end module (FEM) is presented. The FEM features low power consumpiion of 145 mA for 18 dBm output with 3% EVM at 54Mbps transmissions, < -170 dBm/Hz noise emission up to 2 GHz, and high out-of-band interference suppressions, able to support a multi-radio handset with simultaneous operations. The FEM has a 30 dB in-band gain, >24 dB transmitheceive (TIR) isolation under 1O:l mismatch, an integrated regulator, and a temperature compensated power detector. All these unique features provide an easiest integration of a WLAN radio into a multiradio handset.Index Terms -WLAN in cell phones, WLAN front-end module, WLAN power amplifier, WLAN T/R switch design,