16-Element circular polarised antenna array based on sequential arrangement of non-identical disc patches

A circular polarized antenna array based on the recursive application of the sequential rotation architecture is presented. The first level sequential arrangement is applied to a set of four non-identical slightly detuned patches, resulting in a broadband improper array. At second level the sequential arrangement is applied to four identical first-level sub-arrays, regularizing the structure. Experimental validations confirm a gain exceeding 10 dB from 5.35 GHz to 7.25 GHz, with a maximum of 13 dB. Global bandwidth is 30% despite an area of only 2.84\lambda^2_0.