DocumentCode :
1780760
Title :
Parametric study of broadband tunable helix antenna matching
Author :
Kgwadi, Monageng ; Drysdale, Timothy D.
Author_Institution :
Electron. & Nanoscale Eng. Res. Div., Univ. of Glasgow, Glasgow, UK
fYear :
2014
fDate :
10-11 Nov. 2014
Firstpage :
128
Lastpage :
131
Abstract :
Helical antennas are versatile, but they have almost purely resistive input impedance, so lumped element matching networks inevitably incur power loss. We investigate an alternative matching technique that claims up to 1:1 VSWR with post-fabrication tuning, by using an extension above the ground plane. However, our results show that the lowest return losses may actually occur outside the desired band of operation. We show that the matching technique is dependent on the geometry of the matching structure. In an attempt to bring the best match back inside the operating band, we expand the parameter space of the ground plane extension by considering a double bend which we expect to give more linear impedance transition. We achieved broadband operation with up to 20% fractional bandwidth for -15dB return losses within the targeted 2.4GHz LAN frequency band. Further work is required to derive design equations for this matching geometry.
Keywords :
broadband antennas; helical antennas; broadband tunable helix antenna matching; ground plane extension; helical antennas; linear impedance transition; lumped element matching networks; matching structure; matching technique; parameter space; post fabrication tuning; Bandwidth; Broadband antennas; Geometry; Helical antennas; Impedance; Wires; Helix antenna; impedance matching;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation Conference (LAPC), 2014 Loughborough
Conference_Location :
Loughborough
Type :
conf
DOI :
10.1109/LAPC.2014.6996337
Filename :
6996337
Link To Document :
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