Title :
High-Tc superconductive microwave filters
Author :
Lyons, W.G. ; Bonetti, R.R. ; Williams, A.E. ; Mankiewich, P.M. ; O´Malley, M.L. ; Hamm, J.M. ; Anderson, Alfredo C. ; Withers, R.S. ; Meulenberg, A. ; Howard, R.E.
Author_Institution :
MIT Lincoln Lab., Lexington, MA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
Four-pole microstrip bandpass filters have been fabricated using both postannealed and in-situ-grown thin films of Y-Ba-Cu-O. The 4-GHz, 3% bandwidth filters exhibit, at 77 K, a passband insertion loss as low as 0.3 dB, compared with the 2.8-dB loss of similar gold metallic filters at the same temperature. These results demonstrate that complex passive microwave devices can be designed and implemented using high-temperature superconducting (HTS) material. More aggressive filter designs utilizing many more poles will result in much greater performance advantages for an HTS filter technology over a normal metal technology. Ultimately, ultrasharp-skirt filters can be produced, which would allow for more closely spaced communication channels and more efficient use of microwave communication bands than is currently possible with conventional filters
Keywords :
band-pass filters; barium compounds; high-temperature superconductors; microwave filters; passive filters; solid-state microwave circuits; superconducting junction devices; yttrium compounds; 3% bandwidth filters; 4 GHz; 77 K; YBaCuO; communication channels; filter designs; high-temperature superconducting; in-situ-grown thin films; microstrip bandpass filters; microwave communication bands; passband insertion loss; passive microwave devices; postannealed films; ultrasharp-skirt filters; Band pass filters; High temperature superconductors; Microstrip filters; Microwave filters; Space technology; Superconducting filters; Superconducting materials; Superconducting microwave devices; Transistors; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
