HIGH TEMPERATURE SUPERCONDUCTING PHASE SHIFTER

A 90 DEGREE PHASE SHIFTER CAPABLE OF CONTINUOUS OPERATION AT 4-8 GHZ, 80K AND POWER LEVELS OF 1-5 WATTS WILL BE DOMONSTRATED IN PHASE I. WEPROPOSE TO DEVELOP THE PHASE SHIFTER USING HIGH TEMPERATURE SUPERCONDUCTING THALLIUM THIN FILMS AND DEMOSTRATE THE POWER HANDLING CAPABILITY OF THE DEVICE. THE REDUCED SIZE AND POWER DISSIPATION OF THESE DEVICES HAVE ADVANTAGES FOR SYSTEMS APPLICATIONS WHERE VOLUME, WEIGHT AND POWER CONSUPTION ARE KEY CONSIDERATION. TWO PROTOTYPE PHASE SHIFTER DESIGNS WILL BE FABRICATED FROM LOW LOSS TL-CA-BA-CU OXIDE FILMS AND TESTED AS A FUNCTION OF INPUT POWER, TEMPERATURE AND FREQUENCY. IN PHASE II WE WILL DEVELOP A BANK OF LOW-LOSS, SWITCHED DELAY LINES.