Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure

Tao Lin, Wei Bin^†, Guo Xubo, Li Hongcheng, Luo Chenjie, Cao Bisong^‡, Jiang Linan

(a) Coupled N-spiral resonators. (b) Coupled N-spiral resonators with OLSCSs. (c) Simulated response of coupled N-spiral resonators in panels (a). (d) Simulated response of coupled N-spiral resonators with OLSCSs in panel (b).