access icon free Design and tuning of superconducting filter at VHF-band with mechanically switchable interdigital capacitors

© The Institution of Engineering and Technology
Received 06/12/2012, Published
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A tunable superconducting resonator consisting of a microstrip spiral and an 8-bit switchable interdigital capacitor array, controlled by eight mechanical switches, is presented. The measured tuning range of the resonator is 1 MHz from 198.2 to 199.2 MHz with a fine average resolution of 4 kHz and an unloaded Q of over 55000. A four-pole narrowband superconducting filter at 198.7 MHz with 0.2% fractional bandwidth is designed with this resonator and fabricated. By changing the states of the mechanical switches, the resonant frequency of each resonator and hence the frequency response of the filter is successfully tuned.

Inspec keywords: superconducting filters; mathematical programming; VHF amplifiers; switches; interdigital transducers; frequency response; superconducting resonators

Other keywords: 8-bit switchable interdigital capacitor array; VHF-band; four-pole narrowband superconducting filter; resonant frequency; mechanical switches; fractional bandwidth; mechanically switchable interdigital capacitors; tunable superconducting resonator; microstrip spiral; frequency response

Subjects: Superconducting devices; Superconducting microwave devices; Relays and switches; Waveguide and microwave transmission line components; Optimisation techniques; Amplifiers; Filters and other networks; Acoustic wave devices; General circuit analysis and synthesis methods

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