Narrowband high temperature superconducting filter for mobile communication systems

Author

Hong, J.S. ; McErlean, E.P. ; Karyamapudi, B.

Author_Institution

Dept. of Electr., Heriot-Watt Univ., Edinburgh, UK

Volume

151

Issue

6

fYear

2004

Firstpage

491

Lastpage

496

Abstract

The paper reports a recent development of a narrowband high temperature superconducting (HTS) bandpass filter for future mobile communication systems. The filter is designed to have a 5 MHz passband in the UMTS base station´s receive band. The filter exhibits an 8-pole quasi-elliptic function response implemented with a cascaded quadruplet coupling structure. The filter was fabricated on a 0.43 mm-thick sapphire wafer with double-sided YBCO films. The measured filter showed a midband insertion loss of 0.5 dB at 1973 MHz and a return loss better than -15 dB over the passband. It also exhibited an excellent rejection over the entire UMTS base station transmission band.

Keywords

3G mobile communication; UHF filters; band-pass filters; barium compounds; high-temperature superconductors; microstrip filters; superconducting filters; superconducting microwave devices; yttrium compounds; 0.43 mm; 0.5 dB; 1973 MHz; Al₂O₃; UMTS; YBa₂Cu₃O₇; bandpass filter; base station transmission band; double-sided YBCO films; filter fabrication; insertion loss; mobile communication systems; narrowband high temperature superconducting filter; quadruplet coupling structure; quasielliptic function response; sapphire wafer; universal mobile telecommunication system;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:20040972

Filename

1387749