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Design Accuracy of the Resonance Frequency for the PCTJ SIS Mixer

Authors:
Yasunori Fujii, Ken'ichi Kikuchi, Junji Inatani
Abstract:
We are developing a 640 GHz SIS mixer for JENI/SMILES. To tune out the junction capacitance, we use a resonance circuit designed by the parallel connected twin junction(PCTJ) approach. For a certain resonance frequency, the length between two junctions (Lj) depends on the junction capacitance. Since the junction has to be large enough for its reliable fabrication, Lj becomes short for the resonance at 640 GHz. In that case, the resonance frequency is not accurately calculated from a simple assumption that Lj represents the effective inductance, because the junction size and the microstrip width are no longer negligibly small compared to Lj. We investigated the relation between Lj and the actual resonance frequency by means of a simple circuit model of the PCTJ for our 640 GHz mixer.
Categories:
SIS Mixers
Year:
2003
Session:
2
Full-text:
Download a PDF of this paper.
Page Number(s):
52-53