Analysis and Design of Gap-Coupled Annular Ring Microstrip Antenna

<table>(a) Variation of radiation pattern <svg height="16.237499" id="M68" style="vertical-align:-4.74141pt" version="1.1" viewbox="0 0 18.9625 16.237499" width="18.9625" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,16.2375)">
<g transform="translate(72,-59.01)">
<text transform="matrix(1,0,0,-1,-71.95,63.79)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝐸</tspan>
</text>
<text transform="matrix(1,0,0,-1,-63.02,60.66)">
<tspan style="font-size: 8.75px; " x="0" y="0">𝜙</tspan>
</text>
</g>
</g>
</svg> with angle for <i>S</i>  =  0.095 cm. (b) Variation of radiation pattern <span class="inline" id="M69"></span> with angle for
<i>S</i>  =  0.095 cm.</table>

International Journal of Antennas and Propagation

Analysis and Design of Gap-Coupled Annular Ring Microstrip Antenna

Figure 6