Abstract: There is constant demand for wide band, large capacity and high speed communication systems along with the rapid development of wireless communication technology. With the advantage of large transmission capacity, the millimeter wave has attracted more and more research attentions. For 42GHz point to point high data rate wireless communication application, a Q band receiver frontend module is designed and measured in this paper, which utilizes 3stage low noise amplifier (LNA), a mixer and a substrate integrated waveguides (SIW) band pass filter (BPF) for image rejection. Measured results show that the conversion gain of receiver module is more than 15dB with the RF ranging from 40. 8GHz to 42. 8GHz,and the IF of 3. 5GHz. The input power at 1dB compression is no less than -30dBm. And the NF of the receiver frontend is less than 6dB when the IF works between 3GHz and 4GHz.