Volume 19, Issue 4 (December 2023)                   IJEEE 2023, 19(4): 78-90 | Back to browse issues page

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Abimbola Ayorinde A, Adeniyi Adekola S, MOWETE I. An Impedance-Matched Exponentially-non-Uniform Axial-Mode Helical Antenna. IJEEE 2023; 19 (4) :78-90
URL: http://ijeee.iust.ac.ir/article-1-2773-en.html
An Impedance-Matched Exponentially-non-Uniform Axial-Mode Helical Antenna
Ayotunde Abimbola Ayorinde , Sulaiman Adeniyi Adekola , IKE MOWETE
Abstract:   (1089 Views)
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. 
Keywords: Axial Mode, Exponential non-Uniformity, Helical Antenna, Impedance Matching, Return Loss.
Full-Text [PDF 1460 kb]   (432 Downloads)    
Type of Study: Research Paper | Subject: Antenna
Received: 2023/01/08 | Revised: 2024/04/20 | Accepted: 2023/09/13
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© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.