Modeling the RFID radio channel applied to vehicular identification as a waveguide environment

Radio Frequency Identification (RFID) Systems are a wireless communication. Recently they are being applied to vehicular identification in road and freeways. This motivates the analysis of the propagation environment for outdoor in such systems. The RFID Systems that are used for the vehicular identification consists of the reader, the tag and the radio channel which is made up on the ground (asphalt), the free space and surrounded by irregular walls (buses, vans, sport cars, etc., located at adjacent lanes). In this work, the radio channel considering a tunnel environment and modeling as a waveguide is analyzed, in order to obtain the electromagnetic performance of the radio channel. The results show that the proposed model is suitable.