Abstract
A W-band MMIC mixer using 0.15-㎛ T-gate GaAs pHEMT technology is presented. The proposed mixer is designed as a single balanced diode mixer type with schottky barrier diode and implemented with finline transition for 77-㎓ intelligent traffic system(ITS) transceiver(TRx) module. The mixer also includes an IF amplifier to increase a conversion gain, and the waveguide-to-microstrip antipodal finline transition is designed with cosine-squared taper function curve and fabricated with duroid 5880 substrate. The optimized finline transition shows the measured insertion loss of less than 1㏈ and the return loss of higher than 20㏈ for 77㎓. The measured conversion gain of the proposed W-band mixer is 0.3㏈ at LO power of 11㏈m, which satisfies the mixer specification for ITS automotive collision avoidance radar receiver module.
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