A measurement system to investigate dielectric properties of flexible substrates for sensing applications

The rapid prototyping of flexible and low-cost sensors is becoming a real need, especially for research purposes and applications requiring customizable and shapeable sensing solutions. In this paper a dedicated measurement system aimed at investigating the dielectric properties of different flexible materials is presented, aimed at the development of a low-cost, flexible, customizable, inkjet printed pressure sensor. The values of the dielectric permittivity of materials have been indirectly estimated by measuring the capacitance of a suitable set-up. A measurement accuracy of ±1.5%Cm±1.0 pF, up to 220 pF has been achieved. Dielectric constant estimations of rigid, flexible and compressible materials have been reported.