Design of a 440GHz Sub-harmonic GaAs Schottky diode mixer

This paper present the design and optimization of a 440GHz sub-harmonic mixer based on an anti-parallel pair of planar GaAs Schottky diodes which is flip-chipped onto the 100 um thick quartz substrate. Simulation of the sub-harmonic mixer exhibits that the double side band (DSB) conversion loss is below 8.3 dB over the range of 420–460GHz. The optimized conversion loss of the 440GHz mixer is 7.6 dB at 441GHz under the LO level of 5 mW at room temperature.