Transceiver module using GaAs gunn diode and Schottky diode mixer for W-band FMCW radar sensor application

In this paper, we present a transceiver module, which operates at the center frequency of 94 GHz, for a frequency modulated continues wave (FMCW) radar. A transmitter part consists of a waveguide voltage controlled oscillator (VCO) and a magic tee for 94 GHz, and a receiver part is essentially a Schottky diode mixer chip mounted on an Al 2 O 3 sapphire substrate. The fabricated transceiver module has good RF characteristics such as wide linear band with low error late (480 MHz at 1.45 %), high output power through a magic tee (over 11.43 dBm), and good conversion loss at the IF frequency of 500 MHz (10.8 to 11.8 dB).