The design, construction, and testing of a broadband superconducting transformer based on a Dolph-Chebyshev distribution are described. The transformer is completely compatible with thin-film circuit topologies and allows access to 50- Omega coaxial launchers. The transformer is a taper that utilizes only one side of the substrate and features a coplanar waveguide to microstrip transition without the use of via holes. The taper provides a characteristic impedance transformation from 50 Omega to 2 Omega over a frequency range from 5 to 15 GHz. The taper provides a much larger bandwidth than a linear taper with the same length and impedance transformation. >
[1]
D. McGinnis,et al.
Distributed amplifier using Josephson vortex flow transistors
,
1986
.
[2]
B. Zeghbroeck.
Superconducting current injection transistor
,
1983
.
[3]
T. Rajeevakumar.
A Josephson vortex‐flow device
,
1981
.
[4]
V. Semenov,et al.
Josephson junction with lateral injection as a vortex transistor
,
1979
.
[5]
Giovanni Ghione,et al.
Coplanar Waveguides for MMIC Applications: Effect of Upper Shielding, Conductor Backing, Finite-Extent Ground Planes, and Line-to-Line Coupling
,
1987
.