Abstract: A character Identification method has been proposed to obtain a specific reaction of a tag inside a printed chipless RFID system on a lossy dielectric substrate. The proposed technique is based on the eigenmode resonance to generate weight excitation coefficients and to extract a desired current distribution induced on the tag illuminated by a transmitter/receiver antennas arrays using the SVD-eigenmodes. The proposed methodology is based on techniques such as the proposed regrouping method to create groups of tags and the correlation method applied between a measure receive signal and the receive signal belong the library (or the create database). This method allows the confirmation/or not of the belonging of the tag to a group and the recognition of the measure tag based on two important parameters: the magnitude and the phase of an identification vector. The CIM method allows the user to better distinguish the tag from others, and to improve the independence from the environment.

Abstract: An exemplary phase shifter is a waveguide with multiple alternate paths for waves. The phase shifter includes at least two alternative paths, one straight and one curved. Rounding, chamfer, or a combination of both are used at the corners where the path transitions from the straight waveguide section to the curved waveguide section or vice versa.