Displacement Sensor Based on Separated Inverted-F Antenna

In this paper, the concept of separated Inverted-F antenna (SIFA) is proposed, coupling feeding is used in SIFA, and the thickness of the additional capacitor's dielectric is studied to find the suitable range of being a displacement sensor. Simulation result shows that the current can get through the capacitor, and feeder's moving can let the resonant frequency shift linearly. So it's reliable to transform the SIFA to a displacement sensor, so as to provide evaluation basis for structural health monitoring (SHM).