Single-Fed Broadband CP Bidirectional Antenna with Double-Layer Diagonally Aligned Plates for Universal UHF-RFID Applications

<div>Simulation results under variable feeding gap (<i>δ</i>): (a) |<i>S</i><sub>11</sub>|, (b) axial ratio.</div>

International Journal of Antennas and Propagation

Figure 7: Single-Fed Broadband CP Bidirectional Antenna with Double-Layer Diagonally Aligned Plates for Universal UHF-RFID Applications 