Independent Permittivity Sensor Based on Dual T-Shaped Resonator for Solid Material Characterization

This paper proposes an independent permittivity sensor for solid material characterization. The proposed sensor consists of a dual T-shaped resonator with a single port operating at fr1 = 2.32 GHz as 1^st resonator and fr2 = 1.82 GHz as 2^nd resonator for direct detection which has independent performance with different sensing hotspot so it can be used independently. The permittivity of the MUT is detected directly by placing the Material Under Test (MUT) above the surface of the 1^st and the 2^nd resonator. Based on measurement result, the proposed sensor can detect four different MUT independently with different sensing hotspot. This research is very useful for the characterization of solid materials independently for several applications such as biomedical, quality control and pharmaceutical industries.