Title :
Adaptive high temperature superconducting filters for interference rejection
Author :
Raihn, Kurt F. ; Fenzi, Neal O. ; Hey-Shipton, Gregory L. ; Saito, Elna R. ; Loung, P. Vince ; Aidnik, David L.
Author_Institution :
Superconductor Technol. Inc., Santa Barbara, CA, USA
fDate :
7/1/1996 12:00:00 AM
Abstract :
An optically switched high temperature superconducting (HTS) band-reject filter bank is presented. Fast low loss switching of high quality (Q) factor HTS filter elements enables digital selection of arbitrary pass-bands and stop-bands. Patterned pieces of GaAs and silicon are used in the manufacture of the photosensitive switches. Fiber optic cabling is used to transfer the optical energy from an LED to the switch. The fiber optic cable minimizes the thermal loading of the filter package and DC-couples the switch´s power source from the RF circuit. This paper will discuss the development of a computer-controlled HTS bank of optically switchable, narrow band, high Q bandstop filters which incorporates a cryocooler to maintain the 77 K operating temperature of the HTS microwave circuit
Keywords :
Q-factor; adaptive filters; band-stop filters; high-temperature superconductors; interference suppression; low-temperature techniques; microwave filters; packaging; passive filters; photoconducting switches; resonator filters; strip line filters; superconducting microwave devices; superconducting resonators; 77 K; GaAs; HTS microwave circuit; LED; Si; adaptive HTSC filters; band-reject filter bank; computer-controlled HTS bank; cryocooler; digital selection; fast low loss switching; fiber optic cabling; high Q-factor HTS filter elements; high temperature superconducting filters; interference rejection; narrowband high Q bandstop filters; optically switched filters; pass-bands; photosensitive switches; stop-bands; Band pass filters; Filter bank; High temperature superconductors; Interference; Optical fiber filters; Optical fibers; Optical filters; Optical switches; Superconducting cables; Superconducting filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
