Improved Low-Profile Helical Antenna Design for INMARSAT Applications

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="829371.fig.003a" src="https://static.hindawi.com/articles/ijap/volume-2012/829371/figures/829371.fig.003a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b> Impedance curve as a function of <i>s </i></td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="829371.fig.003b" src="https://static.hindawi.com/articles/ijap/volume-2012/829371/figures/829371.fig.003b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Impedance curve as a function of <svg height="12.4375" id="M38" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 4.6999998 12.4375" width="4.6999998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,12.163)"><path d="M238 681l-124 -585q-7 -31 4 -31q10 0 37.5 18.5t49.5 41.5l16 -22q-40 -48 -89.5 -81.5t-76.5 -33.5q-42 0 -16 122l105 488q7 32 0 41t-39 9h-35l5 26q35 3 71 13t58 17.5t26 7.5q14 0 8 -31z" id="x1D459"></path></g>
</svg>  and<i> w </i></td></tr></table></td></tr></table>

<table>Effect of copper strip match stub position and size on input impedance.</table>

International Journal of Antennas and Propagation

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Figure 3

Figure 3: Improved Low-Profile Helical Antenna Design for INMARSAT Applications 