| Summary: | It is expected that the operation of microwave Kinetic Inductance Travelling
Wave Parametric Amplifiers (KITWPAs) can be extended to the millimetre (mm)
and the sub-mm wavelength range as long as the frequency is below the gap
frequency of the superconducting film. This paper presents possible mm-wave
designs for KITWPAs based on microstrip transmission lines. Our device is
designed based on the BCS (Bardeen-Cooper-Schrieffer) model which successfully
reproduces the measured transmission profile, gain, bandwidth, and nonlinear
response of a fabricated KITWPA operating in the Ka-band, and includes the
millimetre-wave dielectric loss determined by fitting the quality factor of a Wband microstrip resonator. We suggest a layout for a KITWPA operating near
220 GHz that can be fabricated using the same superconducting properties as the
Ka-band device and can be coupled to a waveguide system. We conclude the
paper by extending the 220 GHz design to higher frequency regimes approaching
1 THz.
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