  Superconducting quantum circuits are typically operated at low temperatures
(mK), necessitating cryogenic low-noise, wide-band amplifiers for signal
readout ultimately also compatible with room temperature electronics. While
existing implementations partly meet these criteria, they suffer from certain
limitations, such as rippled transmission spectra or limited dynamic range,
some of which are caused by the lack of proper impedance matching. We develop a
MIcrostrip Kinetic Inductance Travelling Wave Amplifier (MI-KITWA), exploiting
the nonlinear kinetic inductance of tungsten-silicide for wave-mixing of the
signal and a pump, and engineer the impedance to $50 \Omega$, while decreasing
the phase velocity, with benefit for the amplification. Despite losses, pumping
on our device amplifies the signal by 15 dB over a 2 GHz bandwidth.
