A multidirectional capacitive proximity sensor array

TR Image
The measurement results. Four subfigures are for the S21 at different frequencies. Four curves in each subfigure represent the object coming from four different directions.

This paper presents a multi-directional capacitive proximity sensor array based on band-stop filter. The band- stop filter is composed of four decoupled LC resonant circuits, so each stop band is determined by one capacitive sensor and its corresponding lumped inductor, respectively. Therefore, the change in capacitance can be obtained by measuring the change of the notches of the band-stop response. The filter is fabricated into a cubic shape for sensing different directions. Experiment results show that the fabricated sensor can detect objects coming from all four directions simultaneously by measuring the transmission at frequencies near four notches. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.