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Electrical and electronic engineering
A method is proposed to adaptively change the axial-ratio beam of simple circularly-polarized antennas. It is shown, that by varying the phase shift between two orthogonal elements the axial-ratio beam shape can be dynamically adjusted. This allows control of the direction of minimum axial-ratio and the ability to increase or decrease the beamwidth in one of two planes. The method is intended for satellite navigation systems: it can improve the rejection of reflected signals in varying propagation conditions (e.g. urban canyons), while using simple and low-cost circularly-polarized antennas.
A. Narbudowicz, M. J. Ammann, and J. Przewocki, (2014) Shaping the Axial-Ratio Footprint of Crossed-Dipole Antennas, LAPC - Loughborough Antennas & Propagation Conference, Loughborough, UK, pp. 598-601, 10/11/2014