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Superconducting spiral bandpass filter designed by a pseudo-Fourier technique

Journal
Date Issued
2018
Author(s)
Huang, Frederick
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Lopez-Perez, Jose A.
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Garcia, Pablo
DOI
Abstract
An iterative technique to adjust ripple in a bandpass filter has been developed by curve-fitting numerical data. It gives an approximate relation of ripple against filter coupling coefficients and resonator resonant frequencies instead of finding a Jacobian matrix for each individual filter, in exchange for making more iterations. Numerical examples show reasonable convergence for Chebyshev filters up to the 16th-order, coupled quadruplets, coupled triplets and folded cross-coupled filters. A bandpass filter for a radio telescope in Yebes, Spain is designed and measured, a tenth-order superconducting spiral filter with 7% bandwidth, 2295 MHz centre frequency, <0.1 dB ripple and overall substrate size 30 mm × 8 mm. The 11 iterative simulations totalled 8.5 h of computer processing time.
Volume
12
Issue
8
Start page
1293
Uri
Url
Issn Identifier
1751-8725
Rights
open.access
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