Wideband (10–67 GHz) Dielectric Properties of Biosourced Cellulose Ester Flexible Films

In this article, the dielectric properties of a biosourced polymer are investigated. To that end, coplanar transmission lines were fabricated on a 600-μm thick cellulose palmitate substrate by using a photolithographic process and a transfer technique. The S-parameters of the transmission lines were measured in a broad microwave frequency band spanning from 10 to 67 GHz in order to determine the propagation constant. From these data, the complex...