The distributed Josephson inductance phase shifter
Abstract
The authors report on a novel microwave phase shifter featuring rapid electronic adjustment, continuous phase control, true time delay operation, high device fault tolerance, and very broadband operation. By coupling a large number of superconducting quantum interference devices (SQUIDs) to a superconducting microstrip transmission line, a variable magnetic medium in which the wave velocity is controlled electronically is created. The authors have measured 60 deg phase shift at 10 GHz, and wideband operation from 5 to 15 GHz for an 8-cm-long Nb transmission line coupled to 1600 SQUIDs, each containing a single Nb/AlO(x)/Nb tunnel junction. The observed phase shift corresponds to a change in wave velocity of about 1 part in 60.
- Publication:
-
IEEE Transactions on Applied Superconductivity
- Pub Date:
- March 1992
- DOI:
- 10.1109/77.124932
- Bibcode:
- 1992ITAS....2...33D
- Keywords:
-
- Fault Tolerance;
- Josephson Junctions;
- Microwave Circuits;
- Phase Shift Circuits;
- Aluminum Oxides;
- Electron Tunneling;
- Microstrip Transmission Lines;
- Niobium;
- Squid (Detectors);
- Electronics and Electrical Engineering