Summary
The method of evaluating the attenuation by measuring the ratio of voltages or powers in the lateral branches of two directional couplers, between which the attenuator is placed, provides a complete elimination of two of the three components of the matching error.
In order to reduce residual errors, the directional coupler at the input of the attenuator must have a good directivity, and the directional coupler at its output must have small reflections from its flanges and from the load in its main branch.
It is possible to eliminate completely in the first approximation the matching eror by using a sliding load (or any other method of phase adjustment).
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Literature cited
Beatty, Journal of Research NBS, 52, 1 (1954).
B. E. Rabinovich and O. V. Stoyakina, “Equipment for testing standard signal generators by their output voltage in the range of 16–1000 Mc”. Advanced Scientific, Technical and Production Experience, TsITEIN Press, topic 33 (1960), No. 1.
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Rabinovich, B.E. Method free from mismatching errors for measuring the loss of attenuators. Meas Tech 5, 238–243 (1962). https://doi.org/10.1007/BF00978676
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DOI: https://doi.org/10.1007/BF00978676