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Single-feed slotted equilateral-triangular microstrip antenna for circular polarization

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3 Author(s)
Jui-Han Lu ; Dept. of Electron. Commun. Eng., Nat. Kaohsiung Inst. of Marine Technol., Taiwan ; Chia-Luan Tang ; Kin-Lu Wong

Novel designs of single-feed equilateral-triangular microstrip antennas for circular polarization (CP) are proposed and studied experimentally. It is demonstrated that by embedding a narrow slot or a cross slot of unequal slot lengths in the triangular patch, circularly polarized radiation of microstrip antennas can easily be achieved using a single probe feed. Furthermore, results show that for the design with a cross slot, the proposed antenna can perform CP radiation with a reduced antenna size at a given frequency (denoted as compact CP operation here); that is, the required antenna size is smaller for the proposed antenna for performing CP radiation as compared to a conventional circularly polarized triangular microstrip antenna at a fixed operating frequency. Details of the proposed CP designs are described, and typical experimental results are presented and discussed

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Antennas and Propagation, IEEE Transactions on  (Volume:47 ,  Issue: 7 )