Title :
Adjustable multilayer HTS filters
Author :
Chen, Kouth ; Chen, Ming-Jye ; Chen, Jau-Han ; Yang, Hong-Chang ; Wang, Li-Min ; Huang, Chao-Yuan ; Wang, Bert
Author_Institution :
Adv. Technol. Co. Ltd., Taipei, Taiwan
fDate :
6/1/2001 12:00:00 AM
Abstract :
An adjustable multilayer high-temperature superconductor (HTS) bandpass filter has been fabricated. Taped comb-line filters with multilayer structures were designed, YBa2Cu3O7-δ (YBCO) thin films deposited on LaAlO3 were used to construct the packaged multilayer HTS filter. The electrical length of the resonators in the filter was smaller than a quarter-wave length. The frequency responses of the filter were measured at liquid nitrogen temperature 77 K. The insertion loss of the packaged filter was determined to be less than 0.5 dB. By mechanically adjusting the multilayer structure, the center frequencies of the filter changed from 1.78 to 1.92 GHz, and the variations of the bandwidth from 60 to 150 MHz were also obtained
Keywords :
UHF filters; band-pass filters; barium compounds; comb filters; frequency response; high-temperature superconductors; losses; superconducting filters; superconducting thin films; yttrium compounds; 1.78 to 1.92 GHz; 60 to 150 MHz; 77 K; LaAlO3; YBa2Cu3O7-δ; YBa2Cu3O7-LaAlO3; bandpass filter; bandwidth variations; center frequencies; frequency responses; insertion loss; multilayer HTS filters; resonator electrical length; taped comb-line filters; Band pass filters; Frequency; High temperature superconductors; Nonhomogeneous media; Packaging; Resonator filters; Sputtering; Superconducting filters; Superconducting thin films; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
