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Broadband twin‐junction tuning circuit for submillimeter SIS mixers
Author(s) -
Belitsky V. Yu.,
Jacobsson S. W.,
Filippenko L. V.,
Kollberg E. L.
Publication year - 1995
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.4650100203
Subject(s) - broadband , bandwidth (computing) , capacitance , diffusion capacitance , optoelectronics , lithography , microwave , heterodyne (poetry) , materials science , physics , electrical engineering , optics , telecommunications , engineering , electrode , quantum mechanics , acoustics
A 400–550‐GHz fixed tuned quasioptical Nb/AlO x /Nb SIS heterodyne receiver has been built, and its performance has been evaluated. The receiver, operated at 3.5 K, showed noise temperatures ≤ 300‐K DSB within the tuning range of the available LO source (440–520 GHz). The SIS junction capacitance was tuned out by a novel twin‐junction circuit, which offered 130‐GHz fixed tuned bandwidth at 480 GHz. Large‐area SIS junctions (3.5 μm 2 , ωR n C ≈ 7.5 at 500 GHz), patterned by optical lithography, were used. © 1995 John Wiley & Sons, Inc.
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