Modeling electromagnetic wave propagation in paper reel for uhf rfid system development

Abstract

According to the operation frequency, radio frequency identification systems are dividable into low frequency and high frequency systems. In low frequency systems, a magnetic field is used in the coupling between the identification device and the reader, and various loop solutions are used as antennas. In high frequency systems, an electric field is used in the coupling, and the antennas used are usually dipole, folded dipole, or microstrip antennas. In passive radio frequency identification systems (RFID), data and power is transferred between a reader and an identification device wirelessly by means of electromagnetic waves. Antenna solutions, in both the identification device and the reader, are crucial to the performance of RFID systems. To improve the performance of these RFID systems application, specific antennas can be used for challenging items, including metals, liquids, or lossy material. This chapter describes the simulation model for radio wave attenuation in paper reel. Simulated values for propagation in different grades of paper are presented.