Abstract

obstacles, and multiple round mast/open mast combinations. An analytical model referred to as the EM shadowing model was developed to provide a good engineering description of the antenna gain loss and pattern characteristics. The EM shadowing model is based on a weighted superposition of the scattered Spherical Angular Functions (SAF's) of each obstacle due to illumination by the victim antenna. The weighing coefficients are computed in terms of the first-order multiple-scattered SAF's for the multiple obstacle cluster. [B.J. Cown, Antenna Pattern Performance and Coupling in the Presence of Near-Field Shipboard Obstacles, Final Tech. Report, Ga.

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