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Design of Circularly Polarized Annular-Ring Slot Antennas Fed by a Double-Bent Microstripline

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5 Author(s)
Jia-Yi Sze ; Nat. Defense Univ., Taoyuan ; Hsu, C.-I.G. ; Min-Hua Ho ; Yu-He Ou
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A novel design of a circularly polarized annular-ring slot antenna is discussed. The circular polarization is attained through a newly proposed double-bent microstripline that feeds the antenna at two different positions. Several structural parameters were experimentally studied with care to establish a design procedure, which was subsequently drawn into a design flow chart. Validation was carried out using the antennas designed at 3.5 and 1.59 GHz. The measured 3-dB axial-ratio bandwidth (ARBW) for the former is 10.5% and for the latter, 10.0%, which is larger than the 8.5% 3-dB ARBW required by an Inmarsat application.

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Antennas and Propagation, IEEE Transactions on  (Volume:55 ,  Issue: 11 )