This paper proposes dual functional microwave sensor for displacement and angular detection of liquid material based on electric coupled (ELC) resonator. The proposed resonator uses a two-port band stop filter operating at a resonant frequency of 2.72 GHz. Polystyrene-mm pipe channels are used to accommodate water samples placed in the sensing area of the sensor in the center of the ELC resonator. Displacement and angular detection were observed based on the shift in the resonant frequency of the resonator. Based on the measurement results, the proposed sensor has a sensitivity for displacement detection of 31.5 MHz/cm with a distance range of d =1 – 4 cm while for angular detection it is 0.33 MHz/o with a rotation angle of 0 – 90° for polystyrene-mm pipe channel filled with water content. This paper makes a significant contribution by proposed a dual functional microwave sensor for displacement and angular detection that can be recommended for the automotive, robotics and aerospace industries.
