Abstract
Terahertz (THz) high-resolution observations for astronomy can only be accomplished with the heterodyne receivers, in which the important local oscillator (LO) is necessary. Found in various THz instruments, GaAs Schottky diodes based frequency multipliers continue to be one of the most useful LOs. This paper briefly reviews two 300 GHz wideband doublers based on the LERMA-C2N Schottky process, as a single chip doubler with high efficiency and a power-combined dual-chip doubler with high power handling capacity. The single chip doubler featuring six diodes will be used as the LO for the 600 GHz sub-harmonic Schottky mixer, and the other dual-chip one would be served to pump a 600 GHz doubler of Submillimeter Wave Instrument on JUpiter ICy Moons Explorer (JUICE-SWI), which is planning to explore the Jupiter and its icy moon atmospheres.
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