Prediction of Near-Field Coupling between Misaligned Antennas

A technique for estimating the main-beam to mainbeam mutual coupling between misaligned-near-field antennas is presented, and predicted and. measured data are compared. The technique is based on calculated main-beam near-field patterns as a function of range for individual antennas. Curves that display the gain reduction along the boresight direction as well as the gain reduction for angles off boresight have been calculated for various types of illumination functions for circular and rectangular apertures. To account for beam distortions caused by asymmetrical illumination due to antennas being misaligned as well as being in very close proximity to each other, experimental data were utilized to improve the prediction technique.