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This letter 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&#x2013;reflect&#x2013;line (TRL) calibration.

Indirect Measurement of Switch Terms of a Vector Network Analyzer With Reciprocal Devices