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Construction of a Side-Band-Separating Heterodyne Mixer for Band 9 of ALMA

Authors:
F.P. Mena, J. Kooi, A.M. Baryshev, C.F.J. Lodewijk, T.M. Klapwijk, R. Hesper, W. Wild
Abstract:
In this article we present the design, modeling and construction of a side-band-separating (2SB) heterodyne receiver for the frequency range from 600 to 720 GHz that corresponds to band 9 band of ALMA. The characteristics of this receiver present a significant improvement over the current double-sideband (DSB) configuration currently under development. The core of the mixer consists of a quadrature hybrid, two LO injectors, two superconductor-insulator-superconductor (SIS) junctions, three signal-termination loads, and two IF filtering systems. All these parts were modeled and optimized prior construction. Our 2 mixer exploits waveguide technology and has been constructed in the split-block technique. We used state-of-the-art CNC micromachining which permitted us to obtain the small dimensions required for this frequency range. The constructed receiver presents a good performance but we suggest various ideas for further improvement.
Categories:
SIS Mixers
Year:
2007
Session:
2
Full-text:
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Page Number(s):
39-43