Title :
A novel rounded-patch dual-mode HTS microstrip filter
Author :
Bertin, G. ; Piovano, B. ; Accatino, L. ; Dai, G. ; Tebano, R. ; Ricci, F.
Author_Institution :
Telecom Italia Lab., Italy
Abstract :
A novel dual-mode high-temperature superconducting (HTS) microstrip filter is presented. Resonators are realized with patches of smooth contour that comprise an internal conductor-free region of elliptical shape. Coupling lines are of low impedance in order to reduce peak current density and increase the power handling capability. The elliptical region is inclined at 45° for providing fine control of coupling and tuning. Two 4-pole filters of Chebyshev and quasi-elliptic type with center frequency of 1.95 GHz and bandwidth of 70 MHz were designed and fabricated. Measured results at 77 K are well comparable with theoretical modelling.
Keywords :
Chebyshev filters; barium compounds; critical current density (superconductivity); high-temperature superconductors; microstrip filters; microstrip resonators; superconducting filters; superconducting thin films; yttrium compounds; 1.95 GHz; 4-pole filters; 70 MHz; 77 K; Chebyshev filters; YBa2Cu3O7; coupling lines; internal conductor free region; novel dual mode high temperature superconducting microstrip filter; peak current density; power handling capability; quasielliptic filter; resonators; tuning; Chebyshev approximation; Current density; Frequency; High temperature superconductors; Impedance; Microstrip filters; Resonator filters; Shape; Superconducting filters; Tuning;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1339180
