Realization of HTS trisection band pass filter

Author

Jhon, Hee-Sauk ; Jeon, Chang Hoon ; Han, Kyoung Bo ; Myoung, Seong Sik ; Yook, Jong Gwan ; Jia, Q.X. ; Lee, Sang Yeol

Author_Institution

Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

294

Lastpage

296

Abstract

We report characteristics of a high-temperature superconductor (HTS) bandpass filter with the designed center frequency of 11.8 GHz. An epitaxial YBa₂Cu₃O_7-x (YBCO) superconducting thin films were grown on a MgO substrate using the pulsed laser deposition (PLD) technique. Use of HTS films for microwave applications provides a realization of high performance planar filters with narrow passband and low insertion loss. We have designed and fabricated trisection bandpass filters with the center frequency of 11.8 GHz. In order to reduce the filter size, the filter was designed to have modified hairpin-type coupled lines. The film thicknesses were about 500 nm. Superconducting transition temperatures have shown to be about 89 K. The fractional bandwidth of the HTS filter was about 1.1% and the band rejection ratio was about 296 dB/GHz. Also the performance of superconducting bandpass filter is compared with a copper filter.

Keywords

band-pass filters; barium compounds; high-temperature superconductors; microstrip filters; pulsed laser deposition; superconducting epitaxial layers; superconducting filters; superconducting microwave devices; yttrium compounds; 11.8 GHz; MgO; MgO substrate; YBCO epitaxial thin film; YBa₂Cu₃O₇; hairpin coupled lines; high temperature superconductor; insertion loss; microwave planar filter; pulsed laser deposition; superconducting transition temperature; trisection microstrip band pass filter; Band pass filters; Frequency; High temperature superconductors; Microwave filters; Pulsed laser deposition; Superconducting films; Superconducting filters; Superconducting thin films; Superconducting transition temperature; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.813713

Filename

1211600