Millimetre Wave Kinetic Inductance Parametric Amplification using Ridge Gap Waveguide

D. Banys, M. A. McCulloch, T. Sweetnam, V. Gilles, L. Piccirillo

Research output: Contribution to journalArticlepeer-review


We present the design and simulation methodology of a superconducting ridge-gap waveguide (RGWG) as a potential basis for mm-wave kinetic inductance travelling wave parametric amplifiers (KI-TWPAs). A superconducting RGWG was designed using Ansys HFSS to support a quasi-TEM mode of transmission over a bandwidth of 20–120 GHz with its internal dimensions optimised for integration with W-band rectangular waveguide. A design of an impedance loaded travelling wave structure incorporating periodic perturbations of the ridge was described. A method to simulate the nonlinear kinetic inductance via user-defined components in Keysight’s ADS was outlined, which yielded the power dependent S-parameters and parametric signal gain. A RGWG with a 30 nm NbTiN coating and 5 μ m conductor spacing, corresponding to a kinetic inductance fraction α∼ 60 % was used for the description of a KI-TWPA with 900 perturbations equivalent to a physical length 25 cm that achieved more than 10 dB of signal gain over a 75–110 GHz bandwidth via 4-wave mixing (4WM).

Original languageEnglish
Pages (from-to)734-742
Number of pages9
JournalJournal of Low Temperature Physics
Issue number3-4
Early online date19 Sept 2022
Publication statusPublished - 1 Nov 2022


  • Kinetic inductance
  • Millimetre wave
  • Parametric amplifier
  • Ridge gap waveguide
  • Travelling wave
  • W-band


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