Title :
Planar superconducting YBCO microwave mixer employing an engineered grain boundary weak link junction
Author :
Seed, R.G. ; Dorsey, P.C. ; How, H. ; Widom, A. ; Vittoria, C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
Abstract :
A microstrip transmission line was patterned from a superconducting YBa/sub 2/Cu/sub 3/O/sub 7-x/ film which was laser deposited on a SrTiO/sub 3/ bicrystal substrate. A microbridge in the microstrip was then patterned at the bicrystal interface to fabricate a superconducting grain boundary junction. Microwave mixing was observed with an input local oscillator frequency of 9.000 GHz, and an input signal frequency of 9.941 GHz. The output signal at 941 MHz was detected as a transmitted signal. The junction was current biased slightly above the critical current I/sub c/. The measured conversion loss was compared to the calculated value based upon a numerical solution of the equation for a superconducting weak link junction.<>
Keywords :
barium compounds; bicrystals; grain boundaries; high-temperature superconductors; microstrip lines; mixers (circuits); superconducting devices; superconducting junction devices; superconducting microwave devices; superconducting thin films; yttrium compounds; 9.000 GHz; 9.941 GHz; 941 MHz; SrTiO/sub 3/; SrTiO/sub 3/ bicrystal substrate; YBa/sub 2/Cu/sub 3/O/sub 7/; bicrystal interface; conversion loss; engineered grain boundary weak link junction; laser deposited film; microbridge; microstrip transmission line; patterned film; planar superconducting YBCO microwave mixer; Frequency; Josephson junctions; Masers; Microstrip; Planar transmission lines; Substrates; Superconducting films; Superconducting microwave devices; Superconducting transmission lines; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
