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A novel slot-ring circularly polarised antenna is reported. With sectorial slots loading, the axial ratio (AR) bandwidth is increased and the circumference of the slot-ring is also reduced to 0.5λ0 (λ0 is the free-space wavelength at the centre frequency). The antenna features a 22.4% impedance bandwidth for |S11|≤−10 dB, a 10.6% bandwidth for AR≤3 dB and stable radiation patterns over the whole operating band.
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Xue et al. (2009) studied this question.
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