Polarization Mismatch Analysis of the Randomly-Oriented RFID Tags Based on Monte Carlo Analysis

This paper investigates the polarization mismatch influences from randomly-oriented tags to detection efficiencies for radio frequency identification (RFID) applications. The random numbers produced by Monte-Carlo method are used to define the orientation relationships between the different polarized reader and tag antennas, and further employed for the modeling and simulation analysis. Considering the polarization mismatch and environmental influences, the transmission losses over free space are calculated by the modified Friis equation. It is then used to compute the final detection efficiencies under different polarizations. The results are obtained under different transmitting powers and distances to give the guideline for the polarization reconfigurable reader antenna design.