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The equivalent source mismatch (GammaG) of a 1.85 mm coaxial power splitter was characterized by use of two statistical measurement techniques. The first technique, originally described by Juroshek uses a modified one-port calibration method to determine GammaG. The second method uses two-port measurements of the splitter with one of the ports loaded with a series of calibration standards. This second, ldquoindirectrdquo method provides measurements of S-parameters for the three-port device that can subsequently be used to calculate GammaG. Measurements of GammaG made with the two techniques are in good agreement. This demonstrates that the value of GammaG of a splitter can be determined by statistical measurement techniques, thus providing the possibility of exploiting redundant measurements to reduce the effect of random measurement errors. Analysis of repeated measurements of GammaG shows that the effect of random measurement errors is lower for the indirect method than for the Juroshek method.