Establishment of S-parameter Traceability for 3.5 mm Coaxial Lines from 10 MHz to 100 MHz

This paper describes the National Metrology Institute of Japan´s (NMIJ) development of the International System of Units (SI) traceable S-parameter standard and measurement techniques in 3.5 mm coaxial lines at radio frequencies (from 10 to 100 MHz). The primary standard is a 300-mm-length air line. The S-parameters of the air line were evaluated by measuring the dimensions and the insertion loss. Using the offset load method, the reflection coefficient of a matched load termination was characterized to perform thru-reflect-match calibrations in vector network analyzer measurements. The uncertainty of the matched load termination, estimated by Monte Carlo simulations, was approximately 0.001 at 100 MHz.