Title :
Superconducting nonreciprocal devices for microwave systems
Author :
Denlinger, Edgar ; Paglione, Robert ; Kalokitis, David ; Belohoubek, Erwin ; Piqué, Alberto ; Wu, X.D. ; Venkatesan, T. ; Fathy, Aly ; Pendrick, Valerie ; Green, Steve ; Mathews, S.
Author_Institution :
David Sarnoff Res. Center, Princton, NJ, USA
Abstract :
The feasibility of applying high-temperature superconductor (HTS) technology to nonreciprocal microwave devices has been demonstrated for the first time. Such devices in the form of isolators and circulators are used widely to achieve stability, reliability, and reproducibility in microwave circuit performance. The experimental X-band device, a three-port stripline circulator consisting of a thin sapphire substrate coated with a YBCO film and sandwiched between two ferrite disks, showed low insertion loss (0.25 dB) and very high isolation (>30 dB) at an operating temperature of 77 K. This technology permits the integration of many HTS microwave components together with nonreciprocal devices on a common substrate.<>
Keywords :
barium compounds; circulators (microwave); high-temperature superconductors; strip line components; superconducting microwave devices; superconducting thin films; yttrium compounds; 0.25 dB; 77 K; Al/sub 2/O/sub 3/ substrate; SHF; X-band device; YBaCuO-Al/sub 2/O/sub 3/; circulators; ferrite disks; high-temperature superconductor; isolators; nonreciprocal microwave devices; sapphire substrate; three-port stripline circulator; Circuit stability; Circulators; High temperature superconductors; Isolation technology; Isolators; Microwave technology; Reproducibility of results; Substrates; Superconducting devices; Superconducting microwave devices;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
