Coaxial Connector Conversion Method for Traceable Scattering Parameter Measurement

This paper reports a connector conversion technique for coaxial lines in the frequency range from 9 kHz to 100 MHz. We designed and fabricated an original connector conversion adaptor, which is composed of an inner conductor and an outer conductor without insulator beads. The scattering parameter of the adaptor was theoretically calculated from the dimensional measurement data, and the expanded uncertainties were propagated from the dimensional measurements, electrical measurements, and configuration of the inner and outer conductors. The method is traceable to the length standard. A measurement to validate the method was performed using a 7 mm to 3.5 mm connector conversion adaptor because these two metrology standards have already been developed in Japan. We confirmed the validity of the proposed method in the frequency range from 9 kHz to 100 MHz.