Title :
Microwave properties of YBa/sub 2/Cu/sub 3/O/sub x/ films grown by liquid phase epitaxy
Author :
Miura, S. ; Jian-Guo Wen ; Suzuki, K. ; Morishita, T. ; Yoshitake, T. ; Fujii, G. ; Suzuki, S.
Author_Institution :
Supercond. Res. Lab., ISTEC, Tokyo, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
Microstrip resonators and filters have been fabricated, using liquid phase epitaxially grown YBa/sub 2/Cu/sub 3/O/sub x/ films on MgO[100] substrates. A microstrip resonator at 10.8 GHz with a YBCO ground plane shows unloaded Q values of 14200 at 77 K and 23300 at 40 K. A microstrip four-pole band-pass filter, with a midband frequency of 10 GHz and a fractional bandwidth of 2% shows an insertion loss less than 0.2 dB and a return loss better than 15 dB at 77 K. The nonlinear behavior of this filter was studied by inter-modulation distortion measurements. This filter shows relatively high power handling capabilities with a third-order intercept point of +65 dBm at 77 K.
Keywords :
Q-factor; band-pass filters; barium compounds; high-temperature superconductors; microstrip filters; microstrip resonators; superconducting epitaxial layers; superconducting microwave devices; yttrium compounds; 10.8 GHz; 40 K; 77 K; MgO; MgO[100] substrates; YBCO ground plane; YBa/sub 2/Cu/sub 3/O; YBa/sub 2/Cu/sub 3/O/sub x/ films; fractional bandwidth; insertion loss; inter-modulation distortion measurements; liquid phase epitaxy; microstrip filters; microstrip four-pole band-pass filter; microstrip resonators; microwave properties; midband frequency; nonlinear behavior; power handling capabilities; return loss; third-order intercept point; unloaded Q values; Band pass filters; Bandwidth; Frequency; Insertion loss; Microstrip filters; Microstrip resonators; Microwave filters; Resonator filters; Substrates; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
