Compact Design of Circularly Polarized Antenna with Vertical Slotted Ground for RFID Reader Application

<div>Geometry of proposed antenna. (a) 3D structure; (b) top view; (c) side view (hide vertical slotted ground). <svg height="8.68572pt" id="M26" style="vertical-align:-0.0498209pt" version="1.1" viewbox="-0.0498162 -8.6359 11.0606 8.68572" width="11.0606pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M828 650H570L564 622C646 614 650 609 634 524L604 366H253L281 524C296 608 308 615 382 622L388 650H132L126 622C211 615 214 609 198 524L121 122C106 42 102 35 23 28L17 0H276L282 28C196 35 191 40 206 122L243 324H597L559 123C544 42 537 35 452 28L446 0H710L716 28C632 35 628 43 643 122L719 524C735 610 741 615 822 622L828 650Z" id="g113-73"></path></g></svg> is the total height of the five layers, <span class="nowrap"><svg height="12.5794pt" id="M27" style="vertical-align:-3.29107pt" version="1.1" viewbox="-0.0498162 -9.28833 137.938 12.5794" width="137.938pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g 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24C82 9 125 -12 172 -12C225 -11 292 15 346 59C408 108 437 166 437 226C437 309 371 397 242 397C214 397 170 382 133 369L158 548Z" id="g50-54"></path></g></svg>,</span> and dielectric constant <span class="nowrap"><svg height="11.6399pt" id="M28" style="vertical-align:-3.29108pt" version="1.1" viewbox="-0.0498162 -8.34882 39.9013 11.6399" width="39.9013pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M387 375C387 402 357 448 257 448C172 448 82 404 82 326C82 289 108 255 156 241V239C85 223 23 181 23 116C23 39 89 -12 182 -12C265 -12 336 31 378 91L361 114C320 73 269 47 216 47C157 47 115 82 115 137C115 191 160 219 218 219C243 219 262 218 272 217L304 259L302 266C295 265 281 264 255 264C195 264 163 294 163 335C163 377 200 416 249 416C293 416 321 389 329 342C331 332 335 329 341 329C355 329 387 352 387 375Z" id="g113-247"></path></g><g transform="matrix(.0091,0,0,-0.0091,5.005,3.132)"><path d="M398 365C398 411 356 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Journal of Electrical and Computer Engineering

fig1

Figure 1

Figure 1: Compact Design of Circularly Polarized Antenna with Vertical Slotted Ground for RFID Reader Application 