Metamaterials for Wireless Communications, Radiofrequency Identification, and Sensors

<table>Schematic of a typical UHF-RFID tag in the most general case. An impedance matching network is located in between the chip (modeled as a<svg height="11.75" id="M233" style="vertical-align:-0.23206pt" version="1.1" viewbox="0 0 28.725 11.75" width="28.725" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg> parallel load) and the tag antenna. <svg height="18.612499" id="M234" style="vertical-align:-2.22495pt" version="1.1" viewbox="0 0 21.775 18.612499" width="21.775" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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</svg> is the power reflection coefficient, which is related to the power transmission coefficient according to<svg height="18.725" id="M235" style="vertical-align:-2.3205pt" version="1.1" viewbox="0 0 92.525002 18.725" width="92.525002" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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<g transform="matrix(.012,-0,0,-.012,80.25,7.613)"><path d="M412 140l28 -9q0 -2 -35 -131h-373v23q112 112 161 170q59 70 92 127t33 115q0 63 -31 98t-86 35q-75 0 -137 -93l-22 20l57 81q55 59 135 59q69 0 118.5 -46.5t49.5 -122.5q0 -62 -29.5 -114t-102.5 -130l-141 -149h186q42 0 58.5 10.5t38.5 56.5z" id="x32"></path></g>
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</svg>.</table>

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fig29

Figure 29

Figure 29: Metamaterials for Wireless Communications, Radiofrequency Identification, and Sensors 