Title :
The distributed Josephson inductance phase shifter
Author :
Durand, D.J. ; Carpenter, J. ; Ladizinsky, E. ; Lee, L. ; Jackson, C.M. ; Silver, A. ; Smith, A.D.
Author_Institution :
TRW Space & Technol. Group, Redondo Beach, CA, USA
fDate :
3/1/1992 12:00:00 AM
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 degrees 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/sub x//Nb tunnel junction. The observed phase shift corresponds to a change in wave velocity of about 1 part in 60.<>
Keywords :
SQUIDs; microwave integrated circuits; phase shifters; strip line components; superconducting integrated circuits; 5 to 15 GHz; Nb-AlO/sub x/-Nb tunnel junction; SQUIDs; broadband operation; continuous phase control; distributed Josephson inductance phase shifter; high device fault tolerance; microwave phase shifter; rapid electronic adjustment; superconducting microstrip transmission line; time delay operation; variable magnetic medium; Couplings; Delay effects; Fault tolerance; Inductance; Niobium; Phase control; Phase shifters; SQUIDs; Superconducting microwave devices; Superconducting transmission lines;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
