Abstract
This paper presents a synthesis design method for superconducting dual-mode dual-band filters. A low-pass to dual-band bandpass frequency transformation is proposed based on lossless lumped-element dual-mode resonator circuits. Formulas for extracting the coupling coefficient k and external quality factor Qe of dual-mode microstrip resonators are derived using the coupling matrix theory and the proposed frequency transformation formula. This makes the design process of dual-mode dual-band filters similar to that of the single bandpass filter. For the demonstration, four dual-band superconducting filters with different dual-mode resonator structures, such as stepped-impedance, stub-loaded, and embedded resonators are designed and fabricated. The measured results match well with the simulations.
Original language | English |
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Article number | 1502809 |
Number of pages | 9 |
Journal | IEEE Transactions on Applied Superconductivity |
Volume | 27 |
Issue number | 7 |
Early online date | 26 Jul 2017 |
DOIs | |
Publication status | Published - Oct 2017 |