Title :
High T/sub c/ superconducting CPW bandstop filters for radio astronomy front ends [YBa/sub 2/Cu/sub 3/O/sub 7/-LaAlO/sub 3/]
Author :
Wallage, S. ; Tauritz, J.L. ; Tan, G.H. ; Hadley, P. ; Mooij, J.E.
Author_Institution :
Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands
fDate :
6/1/1997 12:00:00 AM
Abstract :
We have designed and tested a superconducting coplanar waveguide (CPW) bandstop filter consisting of 8 coupled line sections at a center frequency of 1.53 GHz. A packaged 94.7% bandwidth low pass Chebychev design yielded a filter with a center frequency of 1.56 GHz, less than 1.2 dB insertion loss in the passband and better than 28 dB rejection at 20 Kelvin. With a skirt selectivity of 1.53(=BW/sub 1 dB//BW/sub -28 dB/) and low insertion loss this filter is an excellent candidate for suppressing contiguous spurious signals in cooled low-noise receiving front ends.
Keywords :
Chebyshev filters; UHF filters; band-stop filters; barium compounds; coplanar waveguides; high-temperature superconductors; low-pass filters; radiotelescopes; superconducting junction devices; superconducting microwave devices; waveguide filters; yttrium compounds; 1.2 dB; 1.53 GHz; 20 K; CPW bandstop filters; LaAlO/sub 3/; YBa/sub 2/Cu/sub 3/O/sub 7/-LaAlO/sub 3/; center frequency; contiguous spurious signals; coplanar waveguide; coupled line sections; high T/sub c/ superconductors; insertion loss; low pass Chebychev design; microwave filters; radio astronomy front ends; skirt selectivity; Band pass filters; Bandwidth; Coplanar waveguides; Frequency; Insertion loss; Kelvin; Packaging; Passband; Superconducting filters; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
