THz Passive RFID Tag Based on Dielectric Resonator Linear Array

In this paper, we propose a solution to mitigate the strong clutter signal for a use in a THz indoor self localization system using a chipless tag based on linear dielectric resonator arrays to enhance the Radar Cross Section (RCS) and therefore increase its detectability. Simulation results are presented for a five elements array separated by $ 0.8\lambda$ at 105 GHz where a 18 dB RCS enhancement is achieved. For a multiple tag scenario, seven frequency coded tags that take the binary values from 001 to 111 can be realized by coding bit 1 and 0 by the presence and the absence of three different resonance frequencies in the RCS spectrum, equivalently the presence and the absence of the dielectric resonator array with different dimensions. The tags can be discriminated with a free ambiguity over a wide range of incidence angle of the reader signal of $-/+ 35^{\circ}$.