Title :
A 19-pole cellular bandpass filter using 75-mm-diameter high-temperature superconducting thin films
Author :
Zhang, Dawei ; Liang, G.C. ; Shih, C.F. ; Lu, Z.H. ; Johansson, M.E.
Author_Institution :
Conductus Inc., Sunnyvale, CA, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
A 19-pole bandpass filter designed for the 900-MHz cellular communication band with 25-MHz bandwidth is reported using a compact forward-coupled approach in microstrip configuration. The filter was fabricated using 75-mm-diameter, double-side-coated YBa2Cu 3O7 (YBCO) high-temperature superconducting (HTS) thin films grown by a single-source MOCVD technique on a LaAlO3 substrate. Measurement of the filter at 77 K showed a dissipation loss of 0.5 dB, corresponding to an average unloaded Q-factor of 10000 in 75-mm-diameter microstrip resonators. A minimum return loss of 15 dB was obtained from measurements at 77 K
Keywords :
CVD coatings; Q-factor; band-pass filters; barium compounds; cellular radio; high-temperature superconductors; microstrip filters; superconducting microwave devices; superconducting thin films; yttrium compounds; 0.5 dB; 15 dB; 19-pole bandpass filter; 25 MHz; 75 mm; 77 K; 900 MHz; LaAlO3; LaAlO3 substrate; Q-factor; YBa2Cu3O7; cellular communication; compact forward-coupling; dissipation loss; double-side-coated YBCO; high-temperature superconducting thin film; microstrip resonator; return loss; single-source MOCVD; Band pass filters; Bandwidth; High temperature superconductors; Loss measurement; MOCVD; Microstrip filters; Resonator filters; Superconducting filters; Superconducting thin films; Yttrium barium copper oxide;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
