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Simple design of broadband circularly polarized two‐arm Archimedean spiral antenna
Author(s) -
Tran Huy Hung,
NguyenTrong Nghia
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21813
Subject(s) - spiral antenna , optics , physics , antenna (radio) , coaxial antenna , broadband , axial ratio , antenna measurement , antenna factor , reflection coefficient , impedance matching , balun , planar , acoustics , radiation pattern , electrical impedance , circular polarization , telecommunications , computer science , microstrip , computer graphics (images) , quantum mechanics
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.