The mismatch error in th e measurement of ultrahigh-frequency and microwave va riable atten uators is analyzed and expression s are derived. An example is given to show t h at the mismatch error in measurin g t h e difference in atten uation between two attenuators is less than t ile sum of t h e mi smatc h errors obtained when measuring each attenuator individually.
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R.W. Beatty (1954) studied this question.