One of the major challenges confronting the microwave metrologist today is that of providing an accuracy assessment for the automatic network analyzer (ANA). This paper provides the background and theory for the recently developed on-line solution now in use with the six-port systems at the National Bureau of Standards (NBS).
Glenn F. Engen, "On-line accuracy assessment for the dual six-port ANA: Background and theory," IEEE Transactions on Instrumentation and Measurement, vol. 36, no. 2, pp. 501-506, June 1987.
The complete article is available for download from the publications page.