Progress towards an integrated 380 GHz planar Schottky diode heterodyne receiver on single substrate

: We report on the design, build and characterisation of an integrated submillimetre wave receiver featuring a 380 GHz sub-harmonic mixer and a 190 GHz frequency doubler on a single quartz based microstrip circuit. The integrated circuit uses two separate planar Schottky diode components to perform the doubling and 2 harmonic mixing. Measurement results give best double sideband mixer noise temperatures of 1625 K at 372 GHz, and a corresponding mixer conversion loss of 8 dB. The measured instantaneous RF bandwidth extends from 368 GHz to 392 GHz, in good agreement with simulations. This work represents the first demonstration of a single substrate integrated mixer/multiplier at submillimetre wavelengths.