A novel method to extract dispersive properties for dielectrics over a wide frequency range is proposed. This method is based on measuring scattering parameters for planar transmission lines and applying genetic algorithms. The scattering parameters are converted into ABCD matrix parameters. The complex propagation constant of the TEM wave inside the line is obtained from A-parameters of the ABCD matrix. For planar transmission lines, analytical or empirical formulas for dielectric loss,conductor loss, anaphase constant are known. The genetic algorithm is then used to extract the Debye parameters for the dielectric substrates. FDTD modeling is used to verify the dispersive parameter extraction by comparing with the measurement.

Meeting Name

IEEE Instrumentation and Measurement Technology Conference (2006: Apr. 24-27, Sorrento, Italy)


Electrical and Computer Engineering

Keywords and Phrases

Debye Dispersion Law; S-Parameter Measurement; Conduction Loss; Dielectric Loss; Planar Structure Transmission Lines; Genetic Algorithm; Dielectric Losses; Electric Lines; Finite Difference Time Domain Method; Genetic Algorithms; Parameter Estimation; Vectors; Dispersive Material Parameters; Vector Network Analyzers; Dielectric Materials

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2006 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Apr 2006