Title :
Narrowband Y-Ba-Cu-O filter with quasi-elliptic characteristic
Author :
Vendik, I.B. ; Deleniv, A.N. ; Sherman, V.O. ; Svishchev, A.A. ; Kondratiev, V.V. ; Kholodniak, D.V. ; Lapshin, A.V. ; Yudin, P.N. ; Min, B.C. ; Choi, Y.H. ; Oh, B.
Author_Institution :
Dept. of Microelectron. & Radio Eng., St. Petersburg Electrotech. Univ., Russia
fDate :
3/1/2001 12:00:00 AM
Abstract :
The compact meander-shape configuration of planar resonators is suggested for applications in narrowband filters with quasi-elliptic characteristic. The quasi-elliptic frequency response with two transmission zeroes at the edges of the passband is provided by the specific symmetry of the coupled resonators and is controlled by an appropriate choice of the resonator dimensions and the couplings between the resonators. The 12-pole quasi-elliptic filter with 0.5% fractional bandwidth at 1.775 GHz has been designed using meander-line microstrip resonators and manufactured on a double-sided YBCO film on a LaAlO3 substrate. The filter exhibited the in-band insertion loss less than 0.5 dB at T=60 K, the return loss of 20 dB, the out-of-band rejection better than 75 dB, and 40 dB/MHz slope of the characteristic
Keywords :
band-pass filters; barium compounds; elliptic filters; high-temperature superconductors; microstrip filters; microstrip resonators; microwave filters; resonator filters; superconducting filters; superconducting microwave devices; superconducting resonators; superconducting thin films; yttrium compounds; 0.5 dB; 1.775 GHz; 20 dB; 60 K; LaAlO3 substrate; Y-Ba-Cu-O; YBCO film; bandpass filter; insertion loss; meander line microstrip resonator; planar transmission line; quasi-elliptic frequency response; return loss; Band pass filters; Bandwidth; Couplings; Frequency response; Microstrip filters; Microstrip resonators; Narrowband; Passband; Resonator filters; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
