Evaluation of near-field measurement rates using modulated probes

Rapid near-field measurements by means of a probe array using the modulated scattering method is discussed, and the possible measurement rates in typical configurations are estimated. The measurement signal undergoes two coherent detection stages: one at the test antenna frequency and the other at the modulation frequency of the probes. The different configurations which include monostatic and bistatic set-ups, and adjusted and nonadjusted probes are described and compared. Consideration is also given to sensitivity limits on the reduction of measurement time. It is shown that in spite of a weak sensitivity, the modulated scattering technique reduces the measurement time while preserving acceptable levels of accuracy.