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Simple design of broadband circularly polarized two-arm Archimedean spiral antenna


Huy Hung Tran, Nghia Nguyen-Trong

Source title: 
International Journal of RF and Microwave Computer-Aided Engineering, 29(9): e21813, 2019 (ISI)
Academic year of acceptance: 

This article presents a broadband circularly polarized two‐arm Archimedean spiral antenna with a novel simple feeding method. Contrary to the conventional spiral antenna excited by a vertically or horizontally balun, the presented design is directly fed by a coxial cable with a planar feeding section optimized to provide a broadband input impedance matching. An antenna prototype has been fabricated and measured to validate the concept. Measured results of reflection coefficient and axial ratio show a good performance over a frequency range from 1.0 to 3.5 GHz, equivalent to ~111.1%. Within this band, the antenna prototype exhibits bidirectional radiation with broadside gain values of better than 3.6 dBic.