Design of sextuple-mode triple-ring HTS UWB filter using two-round interpolation |
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| Affiliation: | 1.School of Aeronautics and Astronautics, University of Electronic Science and Technology of China, Chengdu 611731, China;2.Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong SAR, China |
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| Abstract: | A single-stage ring resonator capable of introducing six modes within the ultra-wideband (UWB) passband is presented. The sextuple-mode resonator consists of three rings and three sets of stepped-impedance open stubs. Based on this sextuple-mode resonator, a UWB filter fed by the interdigital-coupling line (ICL) is designed. And we propose a two-round interpolation method to obtain the filter's initial dimensions. The designed filter is fabricated on a double-sided YBCO/MgO/YBCO high-temperature superconducting (HTS) thin film for demonstration. The experimental results show that this UWB filter produces eight resonances in the passband eventually, which effectively improves the in-band reflection and the band-edge steepness. Moreover, the upper stopband performance is enhanced due to the transmission zeros (TZs) generated by the stepped-impedance open stubs and the ICL structure. The measured good performance verifies the practicability of the two-round interpolation approach, which can also be extended to other odd-even-mode filter designs. |
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| Keywords: | HTS filter ring resonator sextuple-mode two-round interpolation ultra-wideband (UWB) |
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