Title :
A 10 GHz thin film lumped element high temperature superconductor filter
Author :
Swanson, D.G., Jr. ; Forse, R. ; Nilsson, B.J.L.
Author_Institution :
Watkins-Johnson Co., Palo Alto, CA, USA
Abstract :
A narrowband thin-film lumped-element filter centered at 10 GHz has been fabricated using thalium-based high-temperature superconductor (HTS) technology. This filter does not suffer from the undesired spurious responses seen in thin-film distributed filters using HTS technology. The measured filter has 2.5-dB insertion loss at band center and 3% bandwidth and is within 50 MHz of the desired center frequency. Measurements were made to confirm the broad spurious free stopbands from 1 GHz to 21 GHz. Because this filter does not generate spurious modes in the substrate, it may be possible to put several filters on the same substrate in microwave systems applications.<>
Keywords :
band-pass filters; high-temperature superconductors; lumped parameter networks; microwave filters; passive filters; superconducting devices; superconducting thin films; thin film circuits; 1 to 21 GHz; 10 GHz; 2.5 dB; SHF; Tl/sub 2/CaBa/sub 2/Cu/sub 2/O/sub 8/; high temperature superconductor; high-T/sub c/ superconductor film; lumped element; microwave systems; narrowband filter; thin film; Bandwidth; Frequency measurement; High temperature superconductors; Insertion loss; Loss measurement; Microwave filters; Narrowband; Substrates; Superconducting filters; Superconducting thin films;
Conference_Titel :
Microwave Symposium Digest, 1992., IEEE MTT-S International
Conference_Location :
Albuquerque, NM, USA
Print_ISBN :
0-7803-0611-2
DOI :
10.1109/MWSYM.1992.188211
