Electromagnetic Identification from UHF to THz: State of the Art, Novel Approaches and Outlook

This paper presents a brief review of the passive EM identification technologies up to THz frequency range. Special attention is devoted to THz identification, where a Dielectric Resonator (DR) is considered to be the most effective frequency encoding element up to date. In this paradigm, the recent advances in DR based identification are comprehensively reviewed. Furthermore, the DR resonance modes are for the first time separated and thus the corresponding RCS of each mode is accurately evaluated. However, the literature counterpart, the superposition of all modes is considered to be the DR RCS. After that, the clutter suppression is discussed in the context of a specific indoor localization scenario. Accordingly, the backscattering signal and system models for separating and detecting these modes are presented. Hence, these developed models are paving the way for developing a unifying evaluation framework which aspires to evaluate performance of the various tag design approaches in different real scenarios.