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Design of a 200GHz sub-harmonic mixer with planar Schottky diodes

This paper presents the design and simulation results of a novel 200 GHz sub-harmonic mixer. The device is based on an anti-parallel pair of GaAs Schottky diodes. The circuits are integrated with the IF filter and fabricated on a suspended quartz-based substrate. A best double sideband mixer conversion loss of 10.5 dB was achieved with 6 mW of LO power. Over an RF band of 183-220 GHz, the double sideband mixer conversion loss is below 15 dB.