WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 20, 2021
Impedance Matching of Axial Mode Helical Antennas
Authors: , , ,
Abstract: In this paper, we study the input impedance characteristics of axial mode helical antennas
to find an effective way for matching it to 50 Ω. The study is done on the important matching
parameters such as like wire diameter and helix to the ground plane gap. It is intended that these
parameters control the matching without detrimentally affecting the radiation pattern. Using
transmission line theory, a simple broadband technique is proposed, which is applicable for perfect
matching of antennas with similar design parameters. We provide design curves to help to choose the
proper dimensions of the matching section based on the antenna's unmatched input impedance.
Finally, using the proposed technique, a 4-turn axial mode helix is designed at 2.5 GHz center
frequency and the measurement results of the manufactured antenna will be included. This parametric
study gives a good insight into the input impedance characteristics of axial mode helical antennas and
the proposed impedance matching approach provides a simple, useful method for matching these types
of antennas.
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Keywords: Circuits for Antennas, Antenna, helix, helical, axial mode, wireless power transfer, impedance matching
Pages: 66-69
DOI: 10.37394/23201.2021.20.8