Direct Synthesis of Dual-Parameter Concentric Ring RA with Enhanced Bandwidth

<table>3D radiation patterns of the 32 <svg height="8.5" id="M44" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.1 8.5" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,0,0,-.017,.062,8.438)"><path d="M528 54l-36 -38l-198 201l-198 -201l-36 38l197 200l-197 201l36 38l198 -202l198 202l36 -38l-197 -201z" id="xD7"></path></g>
</svg> 32 RA computed at the central frequency.</table>

International Journal of Antennas and Propagation

fig9

Figure 9

Figure 9: Direct Synthesis of Dual-Parameter Concentric Ring RA with Enhanced Bandwidth 