A high-temperature superconducting filter for future mobile telecommunication systems

Jia-Sheng Hong, E. P. McErlean, B. M. Karyamapudi

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


This paper presents a narrow-band high-temperature superconducting bandpass filter on a sapphire substrate applicable to future mobile communications systems. The design and simulation of a ten-pole quasi-elliptic function filter implemented using a cascaded quadruplet trisection coupling topology is discussed. The filter is designed to have a 10-MHz passband in the Universal Mobile Telecommunications System base-station receive band. The filter substrate was a sapphire wafer measuring 47 mm /spl times/17 mm /spl times/43 mm, which had a double-sided thin-film coating of Yba/sub 2/Cu/sub 3/O/sub 7/. The filter displayed a minimum insertion loss of 0.2 dB in the passband and a return loss better than (-12dB preliminary) over the passband. A high performance out-of-band rejection associated with a quasi-elliptic filter function was also recorded.
Original languageEnglish
Pages (from-to)1976-1981
Number of pages6
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
Publication statusPublished - Jun 2005


  • Bandpass filters
  • Microstrip filters
  • Microwave filters
  • Superconducting filters


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