Microstrip coupling techniques applied to thin-film Josephson junctions at microwave frequencies

O H Sørensen, Niels Falsig Pedersen, Jesper Mygind, Benny Dueholm, T Finnegan, J Hansen, P. Lindelof

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Three different schemes for coupling to low impedance Josephson devices have been investigated. They all employ superconducting thin-film microstrip circuit techniques. The schemes are: (i) a quarterwave stepped impedance transformer, (ii) a microstrip resonator, (iii) an adjustable impedance transformer in inverted microstrip. Using single microbridges to probe the performance we found that the most primising scheme in terms of coupling efficiency and useful bandwidth was the adjustable inverted microstrip transformer.
Original languageEnglish
JournalI E E E Transactions on Magnetics
Issue number1
Pages (from-to)107-110
Publication statusPublished - 1981

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