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http://hdl.handle.net/20.500.12386/31365
Titolo: | Suppression of spurious harmonic responses in superconducting microstrip spiral filters using gold overlay and stagger tuning | Autori: | Huang, F BOLLI, Pietro MARIOTTI, SERGIO |
Data pubblicazione: | 2020 | Rivista: | IET MICROWAVES, ANTENNAS & PROPAGATION | Numero: | 14 | Fascicolo: | 15 | Da pagina:: | 2123 | Abstract: | The higher order resonances of microwave superconducting filters with spiral resonators were suppressed, giving a very wide stop-band. In one filter spirals were modified to have equal fundamental resonances, but different higher order resonances, by adding stubs and using non-uniform line width. The higher resonances were reduced to −39 dB, in a stop band up to 4.3 times the pass band centre. In another filter, parasitic resistive resonators were added, suppressing the responses to −57 dB. The resistance is provided by patterning the 200 nm gold overlay already required for the external contacts. The increase in pass band loss is not measurable. Measurements of a single spiral resonator with a gold-YBCO bi-layer (200 and 600 nm respectively) suggest that the resistivity of the gold layer at 15 K is the order of 22 times that of bulk gold, a slight advantage for the present application. At 100 K, it is about double. | URI: | http://hdl.handle.net/20.500.12386/31365 | URL: | https://ietresearch.onlinelibrary.wiley.com/doi/10.1049/iet-map.2019.1113 https://api.elsevier.com/content/abstract/scopus_id/85096965454 |
ISSN: | 1751-8725 | DOI: | 10.1049/iet-map.2019.1113 | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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