Abstract
The anisotropy of the dielectric property of polymer materials was measured at GHz bands using cylindrical cavity resonators. We could measure the dielectric anisotropy for the glass epoxy boards with multi-layers. We also measured the dielectric anisotropy of some polymer materials at 5GHz by this method. Epoxy sheet and polytetrafluoroethylene (PTFE) were found to be isotropic materials, whereas polyimide films were anisotropic materials, and their anisotropy increased as the thickness of the films decreased. A more precise design in new device development may be realized by considering the anisotropy of materials.
