Modeling folded dipoles and feedlines for radiation and scattering

Dipole-like antennas, suited for use as radiating elements in large phased arrays, are modeled for efficient analysis by decomposing the antenna into a radiating mode part and a transmission line mode part. All the essential features of folded dipoles, integrated balun feedlines, and feedline scattering are contained in the models. Feedline scattering, in particular, is an important consideration in analyzing phased arrays. The models are suited for moment-method analysis of arrays of such antennas, because the models entail simplified radiation mode parts. Extensive results of exercising the models were obtained for assessing model accuracy. Agreement between full-moment-method analyses and combined-mode analyses was reasonably good