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.
Bibliographical noteCopyright: 1981 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE
Sørensen, O. H., Pedersen, N. F., Mygind, J., Dueholm, B., Finnegan, T., Hansen, J., & Lindelof, P. (1981). Microstrip coupling techniques applied to thin-film Josephson junctions at microwave frequencies. I E E E Transactions on Magnetics, 17(1), 107-110. https://doi.org/10.1109/TMAG.1981.1060965