A well calibrated VNA is the best way of measuring S11/ S22.
A broadband cal kit load is as close to 50Ohm as HP can make it.
A slight mismatch at the end of an air line will allow you to normalise the return loss measurements, but not a full correction (the port match and directivities are not resolvable with this method IIRC)
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--- In hp_agilent_equipment@..., Brooke Clarke <brooke@...> wrote:
Hi:
The most accurate way of characterizing S11 or S22 is to use a scalar network analyzer with a bridge and precision air
line. The cal load is a precision load that's just slightly off from 50.0 Ohms but how much off doesn't matter.
It's far more accurate than a VNA. The key idea is that the air line is exactly 50.0 Ohms and the mismatch causes
ripple above and below that so the center of the ripples is where the location of 50.0 Ohms.
Have Fun,
Brooke Clarke
hp_agilent_equipment@... wrote:
Re: S11 and S22 comparisons on 8753
