Microwave Characteristics of a Conductor Backed CPW by a Home Printed Electronics Technology with Silver Nanoparticle Ink

Various printed electronics with conductive ink are proposed for IoT technology in the radio frequency region. Recently, we can be available a home ink-jet printer with silver nanoparticle ink, readily. However, there are few reports to apply this technology in microwave and millimeter wave regions. In order to investigate the possibility of this technology, transmission characteristics of a conductor backed coplanar waveguide by the home ink-jet printer with silver nanoparticle ink are evaluated in frequency ranges from 50 MHz to 18 GHz. Moreover, complex permittivity of special paper and PET film and conductivity of a printed silver conductor are evaluated in millimeter wave region. As a result, the printed transmission line has been characterized with a loss of 0.2 dB/mm at 18 GHz.