Active Superconductive Devices for Microwave Applications

Domenico Andreone, L. Brunetti, V. Lacquaniti +3 more

Colin M. Pegrum

Superconductors have proven potential for microwave applications, both for passive structures like cavities, filters and transmission lines, and for active devices, such as mixers, detectors, amplifiers and signal sources. The author examines the present status and prospects of such active devices based on high transition temperature (high-T/sub c/) superconducting tunnel junctions.

J. Martens, VINCENT M. HIETALA, T. E. Zipperian +3 more

Microwave two-port S-parameter measurements and modeling of superconducting flux flow transistors are presented. The transistors, based on the magnetic control of flux flow in any array of high temperature superconducting weak links, exhibit significant available power gain at microwave frequencies (over 20 dB at 7-10 GHz in some devices). The input impedance is largely inductive while the output impedance is both resistive and inductive. It is shown that the characteristics of these devices are useful in numerous applications including matched amplifiers, phase shifters and active impedance convertors.>

Pierre HARTEMANN

Robert Adde

Jia Du

The CSIRO Applied Superconductivity Group has a long-term effort in research and development of superconducting electronic devices and systems for various practical applications. In this talk, I will give an overview of CSIRO research activities in developing high-Tcsuperconducting (HTS) Josephson junction devices for various applications. I will firstly describe the CSIRO-developed HTS step-edge Josephson junction technology and its basic application in Superconducting Quantum Interference Devices (SQUIDs). I will then describe in more detail our recent research progress on developing high-Tcsuperconducting (HTS) Josephson devices for microwave and terahertz (THz) applications.