UHF band switchable superconducting filter with pin diode switches

• Published in: Electronics letters 2014-05, Vol.50 (10), p.775-777
• Main Authors: Song, Xiaoke, Wei, Bin, Cao, Bisong, Guo, Xubo, Zhang, Xiaoping
• Format: Article
• Language: English
• Subjects: Applied sciences; bandwidth 29 MHz; Capacitors; Circuit properties; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; frequency 516 MHz; high Q resonators; high‐temperature superconductors; insertion loss; interdigital capacitors; low‐loss switchable superconducting filter; Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Noise levels; PIN diode switches; PIN diodes; p‐i‐n diodes; resonator filters; Resonators; return loss; Superconducting circuits, devices and systems; superconducting filters; superconducting switches; Superconductivity; Switches; Switching, multiplexing, switched capacity circuits; Tuning; two‐pole 2 bit switchable high‐temperature superconducting filter; UHF; UHF band switchable superconducting filter; UHF filters
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2014.0818

A low-loss switchable superconducting filter is presented. High Q resonators loaded with switchable superconducting interdigital capacitors are introduced. A two-pole 2-bit switchable high-temperature superconducting (HTS) filter at 516 MHz with a bandwidth of 29 MHz is designed and fabricated. The measured centre frequency tuning range is 33 MHz (6.4%). In all states, the HTS filter with pin diode switches exhibits an insertion loss