Characterization of liquid crystal polymer from 110 GHz to 170 GHz

Liquid crystal polymer is a promising substrate for mm-wave packaging. In this work, we present the characterization of liquid crystal polymer from 110 GHz to 170 GHz. The microstrip ring resonator method is used for the relative permittivity and loss tangent extraction at mm-wave frequencies. The effect of radiation loss in the extraction of loss tangent is analyzed through full electromagnetic 3D models to verify that radiation loss can be neglected for the particular geometry under study. The Monte Carlo uncertainty analysis is used to analyze the uncertainty of the method taking into account the uncertainty of each measurement involved in the characterization. Using a frequency dispersive model for the effective permittivity for the microstrip, the relative permittivity of LCP is extracted to be 3.17 and the loss tangent varies from 0.0055 to 0.009. This work is the first to characterize the liquid crystal polymer in D-band.