A Simple Adapter De-Embedding Method in the Six-Port Calibration Process Using a Scalar Analyzer

Toshiyuki YAKABE
Hatsuo YABE

IEICE TRANSACTIONS on Electronics   Vol.E77-C    No.6    pp.925-929
Publication Date: 1994/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Measurement Techniques for Microwave/Millimeter Wave)
de-embedding,  six-port,  microwave measurement,  calibration,  

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A simple adapter de-embedding method is presented in a six-port calibration process using only one sliding load and one standard short. Adapter de-embedding is performed to extract the S-parameters of the adapter from the six-port system parameters. The concept of this method is based on the relations between the S-parameters and the Fourier coefficients of the periodic return loss of the adapter. To complete the de-embedding procedure, there are two measurement steps: one is return loss measurement with the sliding load, and the other, sidearm power measurement with the standard short. Using these measured values, unique solutions of the S-parameters are determined. A computer-controlled six-port with 2.4 mm coaxial-type connector was designed for calibration using a waveguide-type sliding load over the frequency range of 8.5-12.0 GHz. Through experiments, the adapter for joining two unlike connector types was measured. Then the reflection coefficients of the adapter with the sliding load measured by the calibrated six-port and those calculated from the S-parameters were compared with each other. As a result, an overall good agreement with standard deviation of less than 0.1% was found at all setting frequencies. One of the main features of the method is that the S-prameters of a two-port as well as the system parameters of a six-port can be determined by means of simple scalar measurement.