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A broad-band microwave superconducting thin-film transformer

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2 Author(s)
McGinnis, D.P. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Beyer, J.B.

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-Ω 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 Ω to 2 Ω 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

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:36 ,  Issue: 11 )