Cross-coupled dual-spiral high-temperature superconducting filter

Author

Tan, C.Y. ; Chen, Linfeng ; Lu, Jian ; Rao, X.S. ; Ong, C.K.

Author_Institution

Dept. of Phys., Nat. Univ. of Singapore, Kent Ridge, Singapore

Volume

13

Issue

6

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

247

Lastpage

249

Abstract

A microstrip bandpass filter implemented with dual-spiral resonators is described in this letter. The dual-spiral resonators make the filter compact and allow implementation of positive and negative inter-resonator couplings. Implementation of the positive and negative couplings is used to introduce a pair of finite frequency transmission-zeros in the filter response. The two zeros are designed to be close to the passband, thus improving the selectivity of the filter. As an example, a four-stage cross-coupled dual-spiral filter is designed and fabricated using superconducting YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// thin films deposited on LaAlO/sub 3/ substrate.

Keywords

band-pass filters; barium compounds; high-temperature superconductors; microstrip filters; poles and zeros; resonator filters; superconducting filters; superconducting microwave devices; superconducting resonators; superconducting thin films; ytterbium compounds; LaAlO/sub 3/; LaAlO/sub 3/ substrate; YBa/sub 2/Cu/sub 3/O/sub 7-d/ thin film; YBa/sub 2/Cu/sub 3/O/sub 7/; cross-coupled dual-spiral high-temperature superconducting filter; dual-spiral resonator; microstrip bandpass filter; transmission zero; Band pass filters; Couplings; Filtering theory; Frequency; High temperature superconductors; Microstrip filters; Microstrip resonators; Passband; Resonator filters; Superconducting filters;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2003.814603

Filename

1208422