Dual-Dipole UHF RFID Tag Antenna with Quasi-Isotropic Patterns Based on Four-Axis Reflection Symmetry

<table>Simulated reflection coefficient of the proposed antenna with different sizes of the feed loop.</table>

International Journal of Antennas and Propagation

Figure 7: Dual-Dipole UHF RFID Tag Antenna with Quasi-Isotropic Patterns Based on Four-Axis Reflection Symmetry 