Title :
High-Tc superconducting planar filters with improved performance
Author :
Vendik, Irina B. ; Gashinova, Marina S. ; Goubina, Maria N. ; Kolmakov, Yaroslav A. ; Kolmakov, Igor A. ; Zhang, Guoyong Y.
Author_Institution :
St. Petersburg Electrotech. Univ., Russia
fDate :
6/1/2003 12:00:00 AM
Abstract :
The results of design and investigation of band-pass filters are presented. The filter is based on a set of double-resonator structures. The main constituent of the filter is the pair of coupled resonators in the form of modified hairpins. The combination of coupling inside the pair and between the pairs provides the desired filter performance. The 12-pole filter (17×22 mm) manufactured on the double-sided YBCO films on LaAlO3 substrate exhibited at T=50 K, 0.3 dB insertion loss, 15 dB return loss in 4% pass band (f0=1.7475 GHz) and 60 dB out of band rejection. Another band-pass filter is 12-pole quasielliptic filter based on quasilumped resonators. This filter area is 21×32 mm (MgO). Filter was designed with 902.5 MHz center frequency, 25 MHz bandwidth and 70 dB out of band rejection.
Keywords :
Chebyshev filters; band-pass filters; barium compounds; elliptic filters; high-temperature superconductors; microstrip filters; microstrip resonators; superconducting filters; superconducting resonators; superconducting thin films; yttrium compounds; 0.3 dB; 1.7475 GHz; 15 dB; 25 MHz; 902.5 MHz; Chebyshev filter; LaAlO3; LaAlO3 substrate; MgO; MgO substrate; YBCO film; YBaCuO; band-pass filter; coupled hairpin resonators; double-resonator structure; high-Tc superconducting planar filter; insertion loss; microstrip resonator filter; multi-pole filter; quasielliptic filter; quasilumped resonator; return loss; Band pass filters; Chebyshev approximation; Dielectric substrates; Frequency response; Insertion loss; Magnetic resonance; Microstrip filters; Microstrip resonators; Resonator filters; Superconducting filters;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.813710
