Illustration of the Impedance Behaviour of Extremely Low-Profile Coupled Shorted-Patches Antennas for UHF RFID of People

<table>A comparison of the radiation efficiency of standard patch and coupled shorted-patches antennas using the same substrate and footprint size (60 × 100 × 0.76 mm).</table>

International Journal of Antennas and Propagation

fig3

Figure 3

Figure 3: Illustration of the Impedance Behaviour of Extremely Low-Profile Coupled Shorted-Patches Antennas for UHF RFID of People 