Title :
Superconducting quasi-lumped element filter on R-plane sapphire
Author :
Kwok, Raymond S. ; Zhang, Dawei ; Huang, Qiang ; Kaplan, Todd S. ; Lu, Jihong ; Liang, Guo-Chun
Author_Institution :
Space Syst./LORAL, Palo Alto, CA, USA
fDate :
5/1/1999 12:00:00 AM
Abstract :
Recent advancement in superconducting microwave technology has led to commercial deployment of high-temperature superconducting (HTS) subsystems for wireless communication applications. Commercialization of the HTS thin-film devices lies within, among other factors, the quality and consistency of the HTS film, as well as the overall cost and performance of the subsystem. In this paper, we present the design and performance of a quasi-lumped element filter on sapphire substrate. Centered at 1857 MHz with 0.8% fractional bandwidth, the six-pole Chebyshev filter has an insertion loss of less than 0.2 dB at 60 K, which translated into a realized unload Q of 35000. This is an important step toward the commercialization of superconducting devices using industrial standard wafers. With the continuous improvement of the HTS film quality, YBCO film on sapphire could be an answer to the future
Keywords :
Chebyshev filters; Q-factor; high-temperature superconductors; microwave filters; sapphire; superconducting filters; superconducting microwave devices; superconducting thin films; 0.2 dB; 1857 MHz; 60 K; Al2O3; Chebyshev filter; HTS thin film device; Q-factor; R-plane sapphire substrate; YBCO film; YBaCuO; high temperature superconducting subsystem; insertion loss; superconducting microwave technology; superconducting quasi-lumped element filter; wireless communication; Commercialization; High temperature superconductors; Microwave filters; Microwave technology; Superconducting filaments and wires; Superconducting films; Superconducting filters; Superconducting microwave devices; Superconducting thin films; Wireless communication;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
