Abstract
Inkjet printing is a low-cost technique suitable to fabricate flexible electronic devices using solutions of conductive nanoparticles on any type of substrate without material waste as in conventional etching techniques. In this study, a low-profile wideband coplanar waveguide-fed monopole antenna operating at 20 GHz is designed and printed using silver nanoparticle ink on polyethylene terephthalate (PET) and on Epson paper substrates. The effects of varying the drop spacing (DS) of the ink on the conductivity of the printed films as well as on the antenna parameters were fully investigated by numerical simulations and by measurements. A conductivity of 1.8 × 10 7 Ω -1 m -1 was obtained for the films printed on PET using a DS of 30 μm leading to superior antenna performance with an achieved gain and antenna radiation efficiency of 1.67 dB and 96%, respectively. In addition, the size reduction reached 99%. On the other hand, antennas on Epson paper substrate show an | S 11 | bandwidth <;-10 dB extending from 17.18 up to 24.3 GHz, leading to a fractional bandwidth of 34.34%.
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