An axial ratio beamwidth enhancement of S-band satellite antenna with parasitic elements

In this article, a structural modification of S-band turnstile antenna to enhance the axial ratio beamwidth by attaching parasitic elements is suggested and investigated. Through the parametric studies and optimization, the positions, shapes and values of the final optimized elements have been obtained with two crossed Bow-tie dipole antennas. The overall structure is composed of main radiator and feeding part using Wilkinson power divider with two stubs for generating phase difference. The electrical performances have been verified in terms of the return loss, radiation pattern, and axial ratio beamwidth by using commercially available full EM simulator.