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

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

International Journal of Antennas and Propagation

Figure 6: Dual-Dipole UHF RFID Tag Antenna with Quasi-Isotropic Patterns Based on Four-Axis Reflection Symmetry 