2007•Unpublished venueRequires access

A quantum-limited submillimeter mixer with an inhomogeneous distributed SIS junction array

Wenlei Shan, Sheng‐Cai Shi, Yutaro Sekímoto, Takashi Noguchi

Abstract

Heterodyne mixing performance of a waveguide SIS mixer with inhomogeneous distributed junction (DJ) array composed of 3 SIS junctions is experimentally investigated at 375-500 GHz. Quantum-limited noise temperature of 3-DJ mixer is demonstrated. Besides its low noise temperature, the mixer conversion gain of 3-DJ mixer is found to be more uniform over RF band than that of a PCTJ (parallel-connected twin junctions) mixer. The FTS (Fourier transform spectrum) response indicates a broad RF bandwidth of the 3-DJ mixer that is limited by the bandwidth of waveguide probe instead of mixer's tuning circuit.

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Available abstract

Key concepts: Frequency mixer, Electronic mixer, Harmonic mixer, Bandwidth (computing), Millimeter, Optoelectronics, Intermediate frequency, Heterodyne detection