Suppression of spurious harmonic responses in superconducting microstrip spiral filters using gold overlay and stagger tuning
Date Issued
2020
Author(s)
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.
Volume
14
Issue
15
Start page
2123
Issn Identifier
1751-8725
Rights
open.access
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IET Microwaves Antenna Prop - 2020 - Huang.pdf
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