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

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

477

Lastpage

480

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919386

Filename

919386