Measurement Analysis of Active Standing Wave Ratio on Networks with a Four-Port Vector Network Analyzer
Résumé
TThe measurement of the active Standing Wave Ratio (SWR) of an antenna array poses an important problem since it requires, for a correct evaluation, to take into account the simultaneous excitation of the various elements that compose it. Indeed, the reflection coefficients obtained for each element when the other elements are powered differ from those obtained by a passive measurement because of the different interactions between the elements. In this paper, we show that the active SWR parameters obtained by using the passive distribution matrix do not correspond to the actual values obtained during a simultaneous excitation of all the elements. A true active SWR measurement procedure is then developed
using the potential of a four-port vector network analyzer having two synchronizing internal sources.
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