A New Technique for Accurate RF Attenuation Measurements

A new technique has been developed for measuring attenuation at RF. Using this technique it is practical to measure accurately greater than 100 dB of RF attenuation in a single step. This technique uses noise injection and coherent detection as additions to an IF series substitution method of RF measurement. A technical description of this new technique is discussed in detail. The component specifications and performance data of an experimental measurement system are described. The measurement results using this system are shown to support the theory. The factors that limit the measurement accuracy of this new technique are discussed and compared with the limitations existing in techniques representing the present state-of-the-art.