Characterization of the Dielectric Properties of Commercially Available Low-loss UV-curable Resins from 60 GHz to 90 GHz

In this paper, two important dielectric properties, the relative permittivity and the loss tangent of a new commercially available UV-curable SLA resin sample are determined. The characterization of the dielectric material is performed in the millimetre-wave range using an open-cavity Fabry-Pérot resonator. According to the manufacturer's data sheet, this ultra low-loss photoresist material, optimised for advanced electronic applications, has a relative permittivity of 2.6 and a loss tangent of 0.003, both at 10 GHz. First, the accuracy of the Fabry-Pérot open-cavity resonator was determined using a reference material called Rexolite. Then, the new dielectric material was measured in a frequency band from 60 GHz to 90 GHz. The results show that the new commercial resin sample has a relative permittivity of 2.59 and a loss tangent of 0.0031 at 71.8 GHz.