Multiport S-parameter calculation from two-port network analyzer measurements with or without switch matrix

A simple method to calculate 3- to n-port S-parameters from two-port network analyzer measurements is described. This multiport calculation (MC) procedure supports all two-port calibration methods e.g. SOLT or LMR without any additional standard. Small included approximations have no influence on the quality of practical measurement results. This developed MC-procedure works with vector network analyzers with three or four measurement channels to measure two-port paths of n-port devices with high accuracy. A switch matrix can be used to simplify the measurements. The presented calculation algorithm of the MC-procedure is out-standing regarding the simplicity and numerical robustness. The algorithm allows an easy programming for the correction of measurements of any device independent of the number of ports (3 to n). Experimental results attest the very good precision of MC error corrected measurements.