Nanojet Printed Coplanar Waveguides on Flexible Polyimide Substrate up to 24GHz

This work proposes an approach for manufacturing of high precision ungrounded coplanar waveguides as high speed interconnections for flexible and wearable sensors as well as IoT systems. Characterization of these printed transmission lines up to a frequency of 24GHz reveals an insertion loss of up to 8dB/cm and therefore provides practical advice towards realizable line lengths. Although exhibiting approximately 4 times the attenuation as compared to conventionally manufactured flexible PCB transmission lines, the proposed approach allows for selectively realizing highly precise structures where necessary. Moreover, it is applicable on three-dimensional substrates, such as 3D-MIDs and therefore addresses various future applications.