Impact of CNT-film printed on conformal resonator on paper

Printed electronics is one of promising technology to make passive microwave circuits, which can be manufactured using traditional inkjet-printing tools at low temperature fabrication and a low cost production. In the present study, we report a tunable microwave resonator depending on the density of carbon nanotubes (CNT) printed in thin layers. The whole module is realized by inkjet printing on paper substrate and designed by finite-element simulations using HFSS to operate around 30 GHz. The resonator is firstly printed by Ag ink and then the CNT films are printed on a specific place of the resonator, which we can control the electrical conductivity by tuning on the density printed (from 3.49 to 27.9 CNT/μm2), and resulting in the variation of the frequency resonance of the resonator. The electrical performance characterization of the resonator printed is reported, and demonstrated two different states, one state called “ON” and one state called “OFF”.