Research Article

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

Figure 1

Radiation patterns of tag antenna with four-axis reflection symmetry and non-four-axis reflection symmetry.
194145.fig.001a
(a) Four-axis reflection symmetry
194145.fig.001b
(b) Non-four-axis reflection symmetry