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A 4 : 1 Transmission-Line Impedance Transformer for Broadband Superconducting Circuits

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4 Author(s)
Ranzani, L. ; Dept. of Electr. & Comput. Eng., Univ. of Colorado, Boulder, CO, USA ; Spietz, L. ; Popovic, Z. ; Aumentado, J.

We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 Ω in the coplanar waveguide to 6.25 Ω in the microstrip and is designed to operate at 20 mK. Calibrated measurements in a dilution refrigerator demonstrate a -3 dB bandwidth from 1.6 to 13 GHz. In a modified Ruthroff design, a small capacitor is integrated at the input as a direct-current block, making it suitable for biasing and matching to low-impedance active circuits, such as superconducting quantum interference device (SQUID) amplifiers.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 5 )