Title :
Coplanar quarter-wavelength resonator filters fabricated by the superconducting sol-gel films
Author :
Kanaya, H. ; Senoh, H. ; Kaneyuki, T. ; Awai, I.
Author_Institution :
Dept. of Electr. & Electron. Eng., Yamaguchi Univ., Ube, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
High temperature superconducting Y-Ba-Cu-O films were prepared on MgO polycrystal substrates by the sol-gel process. The average transition temperature and the surface resistance are 83 K and 2.8 m/spl Omega/ (at 30 K and 9.9 GHz, input power =-10 dBm), respectively. We fabricated a YBCO coplanar waveguide (CPW) quarter-wavelength (/spl lambda//4) resonator around 2 GHz (the length of the resonator is one half as long as that of the popular half-wavelength (/spl lambda/1/2) resonator) and compared its RF properties with that of a /spl lambda//2 resonator. Moreover, 2-pole CPW bandpass filter using YBCO sol-gel film was constructed with capacitively coupled /spl lambda//4 resonators. It has a narrow fractional bandwidth (3.60%) at 30 K.
Keywords :
UHF filters; band-pass filters; barium compounds; coplanar waveguide components; high-temperature superconductors; resonator filters; sol-gel processing; superconducting microwave devices; superconducting resonators; superconducting thin films; yttrium compounds; 2 GHz; 2.8 mohm; 83 K; CPW bandpass filter; MgO; RF properties; YBaCuO-MgO; capacitively coupled /spl lambda//4 resonators; coplanar quarter-wavelength resonator filters; fractional bandwidth; superconducting sol-gel films; surface resistance; transition temperature; Coplanar waveguides; High temperature superconductors; Radio frequency; Resonator filters; Substrates; Superconducting films; Superconducting filters; Superconducting transition temperature; Surface resistance; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
