%0 Journal Article
%A Abimbola Ayorinde, Ayotunde
%A Adeniyi Adekola, Sulaiman
%A MOWETE, IKE
%T An Impedance-Matched Exponentially-non-Uniform Axial-Mode Helical Antenna
%J IRANIAN JOURNAL OF ELECTRICAL AND ELECTRONIC ENGINEERING
%V 19
%N 4
%U http://ijeee.iust.ac.ir/article-1-2773-en.html
%R 10.22068/IJEEE.19.4.2773
%D 2023
%K Axial Mode, Exponential non-Uniformity, Helical Antenna, Impedance Matching, Return Loss.,
%X This paper, using the circuit-geometric features of the Method of Moments (MoM), presents a comprehensive analytical treatment of an exponentially non-uniform helical antenna (ENH), mounted on a ground plane of finite extent. Earlier investigations reported in the literature established that the introduction of an exponential non-uniformity in the turns spacing of an otherwise uniformly wound helical antenna significantly improves its axial ratio and power gain profiles, but failed to address two important questions; one concerning the influence of the degree of non-uniformity on the antenna performance: and the other, the associated return loss profile, which is of particular importance in practical applications. It is shown in this paper, that when a properly designed impedance matching circuitry is introduced, a return loss of the ENH of close to 60 dB is achievable; without compromising axial ratio and gain performances. Indeed, axial ratio bandwidth remained unchanged at 54.55% for both the impedance-matched and unmatched ENHs, whilst maximum gain changed marginally from 14.19dB, for the unmatched ENH to 14.18dB for the impedance-matched antenna.
%> http://ijeee.iust.ac.ir/article-1-2773-en.pdf
%P 78-90
%& 78
%!
%9 Research Paper
%L A-10-4516-1
%+ DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING UNIVERSITY OF LAGOS, AKOKA,, LAGOS, NIGERIA
%G eng
%@ 1735-2827
%[ 2023