A dual band circular polarized antenna array based on the sequential arrangement of non-identical disc patches

We present a circular polarized antenna array based on the sequential rotation architecture applied to a set of nonidentical antenna elements. Exploiting the recursive application of sequential rotation architecture, the entire set of elements is excited with the opportune phase progression, despite the different resonant frequencies. The resulting structure is an irregular array, suitable for operation at two independent frequencies.Simulation shows a gain exceeding 11.0 dB at 5.3 GHz and 12.5 dB at 6.9 GHz. Return loss better than 18 dB is observed, as well as, polarization ratios exceeding 22 dB. Adequate bandwidths around the operation frequencies are observed as well.