Basic Study on a Novel FDTD Method Implemented Frequency Dispersion of PCB

Signal transmission degrades significantly in GHz band due to loss of substrates, which is generally frequency-dependent. In this paper, the purpose is to develop a novel FDTD algorithm which can incorporate frequency dispersion of FR-4 substrates. Complex relative permittivity is measured up to 26.5 GHz by balanced-type circular disk resonator and then used in the FDTD analyses. It is shown that numerical results are in a good agreement with measurement results using VNA over the broad frequency range, demonstrating validity of the method.