Investigations On W-Band Millimeter-Wave Radar Front-End

W-band millimeter-wave radar has the characteristics of good miniaturization,high resolution,all-weather work,etc.It is widely used in vital signs detection,security monitoring,intelligent traffic,especially automotive radar.There is a strong interest in W-band millimeter-wave radar.The W-band millimeter-wave radar RF front-end and devices are investigated.The main contents are as follows:The W-band millimeter-wave radar RF front-end with three transmitters and four receivers is presented.Some key technologies which include frequency synthesizers,intermediate-frequency circuits,microstrip antenna arrays,RF vias,and PCB layout are researched.The measurement results show that the phase noise of 25.6 GHz output signal is-92.70 dBc/Hz@1MHz.Good flat power of the output FMCW signals is achieved.The receiving path can work normally.In the research of millimeter-wave radar devices,a small power amplifier and a low noise amplifier are designed based on GaAs technology.The measurement results of the small power amplifier show a peak gain of 19.2 dB at 99 GHz with a relative 3-dB bandwidth of42%(from 67 GHz to 103 GHz).The saturated output power(Psat)is greater than 14 dBm in the 3-dB bandwidth frequency range with a peak value of 17.1 dBm.For the low noise amplifier,simulation results show that the gain is around 20 dB at 60 GHz to 90 GHz,and the noise figure is better than 3 dB.