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In the procedures for microwave power calibration, which are well documented, the subject of mismatch errors (or corrections) plays a major role. In particular, the evaluation of mismatch corrections requires the measurement of complex r eflection coefficients; and the accuracy of this measurement is limited , in part, by connector imperfections. The applica tion of recently developed "power equation" methods to th is problem provides both a simplified determ ination of the mismatch correction (Mgm) and improved accuracy. In particular, the intermed iate step of measuring the reflection coefficients is eliminated, and the precision connector requirement is greatly relaxed. If this new method were adopted at each level of the usual calibrat ion hierarchy, the accuracy of disseminating measuremen ts re ferenced to the primary standards at NBS would be greatly improved. T he accuracy potential was demonstrated in a series of experiments involving the Type N, GPC-7, a nd waveguide flan ge connectors. The outcome of this experi ment al evaluation, in whi ch the "ord inary" Type N performed on a par with GPC-7, rai ses some rather serious questions relative to current trends in connector development.

An improved method for microwave power calibration, with application to the evaluation of connectors