Abstract
This paper presents detailed experimental and analytical results for a 500-GHz tuneless waveguide SIS mixer, which is incorporated with parallel-connected twin junctions. The 500-GHz SIS mixer exhibits as low an overall receiver noise temperature as 176 K at 482 GHz, despite relatively poor quality of the SIS junction. The effect of the junction subgap leakage is therefore investigated. The experimental results are finally compared to those simulated by the quantum theory of mixing.
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