Title :
Dual mode superconducting planar filters based on slotted square resonators
Author :
Cassinese, A. ; Andreone, A. ; Barra, M. ; Granata, C. ; Orgiani, P. ; Palomba, F. ; Panariello, G. ; Pica, G. ; Schettino, F.
Author_Institution :
Naples Univ., Italy
fDate :
3/1/2001 12:00:00 AM
Abstract :
A new kind of dual-mode filter based on cross and transverse slotted square resonators is presented. A pair of unequal crossed slots formed on a square patch resonator provides both a reduction of the filter size and a simple and controllable way to couple the two degenerate modes. Transverse cuts opportunely realized on the patch further decrease the operating frequency without any appreciable change in the power handling capability of the device. Three examples of single stage filters operating in C-band with 1% and 10% fractional bandwidth are designed with a commercial 2.5D software and fabricated using Nb and YBa2Cu3O7 films grown on LaAlO3 (100) substrates. The filters response is characterized at different temperatures and the insurgence of non-linearity investigated varying the input power and carrying out intermodulation measurements
Keywords :
barium compounds; high-temperature superconductors; microwave filters; niobium; resonator filters; superconducting filters; superconducting microwave devices; superconducting resonators; superconducting thin films; yttrium compounds; 2.5D software; C-band; CAD; LaAlO3(100) substrate; Nb; Nb film; YBa2Cu3O7; YBa2Cu3O7 film; dual-mode superconducting planar filter; intermodulation; nonlinearity; power handling; slotted square patch resonator; Bandwidth; Frequency; High temperature superconductors; Microwave filters; Resonator filters; Size control; Superconducting films; Superconducting filters; Superconducting microwave devices; Surface resistance;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
