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A wideband circularly polarized antenna with L-shaped monopole slots and rotated parasitic patches has been proposed. The measured results show that the antenna has VSWR (<; 2) and axial-ratio (AR <; 3 dB) bandwidth of 64%. A novel wideband feeding structure has been used to excite the L-shaped slot and match the structure to 50-Ω impedance. The rotated parasitic patches are devised in the close proximity of slot to further enhance the circular polarization purity. Moreover, a Bazooka (sleeve) balun is used to eliminate the currents on the shield of coaxial feeding line and degrade AR. The antenna is relatively low-profile, low-cost, and easy to fabricate.
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Pazoki et al. (2015) studied this question.
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