A power handling capability improved HTS filter using modified sliced line resonators

Highlights: • We proposed a modified sliced line resonator with high power handling capability. • The peak current densities of all sliced lines in the resonator are almost equal. • A 10 W HTS filter was designed and fabricated. • The power handling capacity increases 76% compared with the sliced line resonator. - Abstract: In this article, a modified sliced-line resonator for high temperature superconducting (HTS) filters with high power handling capability is proposed. The resonator consists of 18 equal length lines in parallel with 3 unequal length lines on both outsides. The maximum current density of this kind of resonator is investigated and compared with the conventional microstrip line resonator and the sliced-line resonator. The simulations show that the resonator enables an increase of 76% power handling capability compared with the sliced-line resonator. A four-pole HTS filter with a centre frequency of 3.65 GHz and a bandwidth of 0.7% was designed and fabricated based on the proposed resonator. The measurements of the filter show a power handling capability more than 10 W