Some results of application of helical radiators in linear antenna arrays for shaping flat-topped radiation patterns

Electrodynamical modeling of linear antenna arrays consisting of three and five cylindrical helical radiators is carried out. The modeling includes optimization of the radiator geometrical parameters aimed at shaping flat-topped (sectorial) array element radiation patterns with providing low return loss. Some results characterizing sufficiently high quality of the flat-topped radiation patterns in the frequency band 2.7–2.9 GHz at element spacing 0.9–1.1 of wavelength, as well as influence of array edges on the element radiation pattern shape are presented.