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Wideband circular polarization with a boresight axial ratio of ≤ 2.2 dB is achieved over 35% of bandwidth by sequential rotation of linearly polarized radial stub‐fed slot elements (2 × 2 array). The effect of the feed interactions upon the antenna radiation pattern is also analysed. The impedance bandwidth of the antenna is 40%, centered at 2.1 GHz for VSWR ≤ 1.5. The average measured gain of the antenna is 3 dB.
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P. H. Rao (2004) studied this question.
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