Experimental characterisations of thin film transmission line losses

New frequency-variant losses of planar thin film transmission lines are experimentally investigated in a broad frequency range. The frequency-variant transmission line parameters are accurately determined in the measured frequency band (i.e. from 40 MHz to 50 GHz). Then, it is shown that there are three critical frequencies that characterise the loss mechanism of thin film transmission lines. The conventional skin-effect model is not accurate in thin and fine transmission lines.This work was supported by the Development of Technologies for Next-generation Electromagnetic Wave Measurement Standards, project of the Korea Research Institute of Standards and Science under grant no. 12011016