Compact Circularly Polarized Multiband Antennas for RFID Applications

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="783602.fig.003a" src="https://static.hindawi.com/articles/ijap/volume-2014/783602/figures/783602.fig.003a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Reflection coefficient S11</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="783602.fig.003b" src="https://static.hindawi.com/articles/ijap/volume-2014/783602/figures/783602.fig.003b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Axial ratio</td></tr></table></td></tr></table>

<table>Coax-fed dual-band CP antenna S11 and axial ratio results.</table>

International Journal of Antennas and Propagation

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Figure 3

Figure 3: Compact Circularly Polarized Multiband Antennas for RFID Applications 