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A low noise 230 GHz heterodyne receiver employing 0.25-μm2 area Nb-AlOx-Nb tunnel junctions

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5 Author(s)
Kooi, J.W. ; California Inst. of Technol., Pasadena, CA, USA ; Chan, M. ; Phillips, T.G. ; Bumble, B.
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The authors report recent results for a full-height rectangular waveguide mixer with an integrated IF matching network. Two 0.25 μm 2 Nb-AlOx-Nb superconducting-insulating-superconducting (SIS) tunnel junctions with a current density of ≈8500 A/cm2 and ωRC of ≈2.5 at 230 GHz have been tested. One of these quasiparticle tunnel junctions is currently being used at the Caltech Submillimeter Observatory in Hawaii. Detailed measurement of the receiver noise have been made from 200-290 GHz for both junctions at 4.2 K. The lowest receiver noise temperatures were recorded at 239 GHz, measuring 48 K DSB at 4.2 K and 40 K DSB at 2.1 K. The 230-GHz receiver incorporates a one-octave-wide integrated low-pass filter and matching network which transforms the pumped IF junction impedance to 50 Ω over a wide range of impedances

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 5 )