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A low-profile broadband quad-polarization reconfigurable omnidirectional antenna is presented. The quad-polarization antenna consists of a circular loop for horizontal polarization (HP) and a toploaded monopole for vertical polarization (VP). The circular loop is composed of four arc dipoles excited by a broadband feeding network. The left-handed circular polarization (LHCP) is obtained by simultaneously feeding the circular loop and the top-loaded monopole with different phases. Two λ g/2 phase shifters are introduced for the right-handed circular polarization (RHCP). The 12 p-i-n diodes are employed in the feeding network to realize the quad-polarization reconfiguration. It is shown that the bandwidth of the quad-polarization reconfigurable omnidirectional antenna overlapped for HP, VP, LHCP, and RHCP is about 28.6% (1.65-2.2 GHz) with good omnidirectional patterns. The total height of the antenna is about 0.09λ0.
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Cui et al. (2019) studied this question.
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