Limitations of Near-Field Back Projection for Phased Array Tuning Applications

Authors: Daniël Janse van Rensburg
Publication: AMTA 2001
Copyright Owner: NSI-MI Technologies

Simulated data is presented for a planar array to demonstrate the limitations of planar near-field back projections. It is well known that the result obtained in this way is of limited resolution and accuracy and these limitations are further illustrated through the data presented here. The impact of probe to AUT separation distance is shown as well as the correspondence between array excitation perturbations and that detected through the back projection technique. Results are shown for a simple iterative array excitation adjustment process. The purpose of this paper is to provide guidelines for the application of the planar near-field back projection technique.

 

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