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International Journal of Antennas and Propagation
Volume 2017, Article ID 7365793, 5 pages
Research Article

Design of Internal Wire-Based Impedance Matching of Helical Antennas Using an Equivalent Thin-Wire Model

1School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade, Serbia
2Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523-1373, USA
3Serbian Academy of Sciences and Arts, Knez Mihailova 35, 11000 Belgrade, Serbia

Correspondence should be addressed to Milan M. Ilić; sr.fte@cilinalim

Received 9 August 2017; Accepted 23 November 2017; Published 17 December 2017

Academic Editor: Miguel Ferrando Bataller

Copyright © 2017 Slobodan V. Savić et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose a novel design of internal impedance matching networks for axial-mode helical antennas. This network comprises a single wire attached to the helix. One of the main challenges when designing an internal matching network is its strong electromagnetic coupling with the antenna. The matching network must hence be designed in the presence of the antenna, which slows down the design process. To overcome this problem, we formulate an equivalent thin-wire model of the complete helix, including the matching wire (matching network) and the dielectric support. This computationally low-demanding model can be analyzed extremely rapidly, yielding accurate results, which are in excellent agreement with alternative numerical solutions and measurements.