About Frequency Domain Reflectometry

Dear everyone,

I have some measurement(scattering parameter) data of microwave cable.

And try to apply ifft for transformation of time domain. But result is bad.

About time domain, VNA and simulation tool is same result. It's mean result is good.

I don't know how to apply method.

If you know method, please help me.

Thanks in advance.

define "bad".

You want to use a wide a frequency range as possible.
You want to use the right frequency spacing/# of points for the data.