Abstract
A circular polarised 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 the second level, the sequential arrangement is applied to four identical first-level sub-arrays, regularising the structure. Experimental validations confirm a gain exceeding 10 dB from 5.35 to 7.25 GHz, with a maximum of 13 dB. Global bandwidth is 30% despite an area of only 2.84 λ 0 2
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