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Design of a Modified Tree-fractal Antenna for RFID Reader Applications

This research paper describes the design of a modified tree-fractal antenna intended for RFID reader applications. The proposed planar antenna is linearly polarized and comprise of a tree-fractal shaped monopole radiator with a filleted ground plane. Simulation results indicate that the planar antenna exhibit a wider bandwidth (3.98 GHz – 8.6 GHz) with an omnidirectional radiation pattern. The overall dimension of the design i.e. 0.46λ × 0.36λ × 0.015λ (λ = wavelength at lowest cutoff frequency) shows that the proposed design is compact related to previously reported designs. With a peak realized gain of 3.6 dBi, the tree-fractal antenna is suitable for short-range RFID reader applications.