This paper presents an indirect method for measuring the switch terms of a
vector network analyzer (VNA) using at least three reciprocal devices, which do
not need to be characterized beforehand. This method is particularly suitable
for VNAs that use a three-sampler architecture, which allows for applying
first-tier calibration methods based on the error box model. The proposed
method was experimentally verified by comparing directly and indirectly
measured switch terms and performing a multiline thru-reflect-line (TRL)
calibration.Comment: GitHub: https://github.com/ZiadHatab/vna-switch-term