The Impact of Ageing on the Dielectric Properties of Laminates for 79 GHz Automotive Radar

We present a study of the change in dielectric properties for an example laminate under different accelerated ageing conditions and various durations. The dielectric properties are extracted by use of an open resonator. An estimate of the impact of the changed properties is demonstrated for a microstrip line, a grounded coplanar line and a patch antenna at 79 GHz. We report significant changes in permittivity and loss tangent for temperature loading with potentially drastic impact on the performance of RF interconnects and components.