A Physical Surface Roughness Model and Its Applications

Journal article


Publication Details

Author(s): Gold G, Helmreich K
Journal: IEEE Transactions on Microwave Theory and Techniques
Publication year: 2017
ISSN: 0018-9480
Language: English


Abstract


This paper covers the essential aspects of modeling surface roughness for microwave applications based on underlying physics. After a short summary of the relevant field theoretical fundamentals, surface roughness metrology and commonly used roughness parameters are described. Existing models and their limitations are discussed before the recently proposed Gradient Model is introduced. To this purpose, the modeling approach, the derivation from Maxwell's equations, model predictions, and their experimental verification are shown. Reasonable choices for effective material parameters reflecting the electromagnetic effects of surface roughness as well as a corresponding surface impedance concept are derived. Both concepts allow for easy application of the Gradient Model with 3-D field solvers or analytical models. The obtained simulation results illustrate roughness impact on loss and phase delay in typical transmission lines. Comparison to measurement results up to 100 GHz shows that the Gradient Model accurately predicts these quantities for rough conductor surfaces. As it is not limited to transmission lines only, it significantly improves the design process for arbitrary microwave applications with 3-D field solvers for this frequency range.



FAU Authors / FAU Editors

Gold, Gerald Dr.-Ing.
Professur für Rechnergestützten Schaltungsentwurf
Helmreich, Klaus Prof. Dr.-Ing.
Professur für Rechnergestützten Schaltungsentwurf


How to cite

APA:
Gold, G., & Helmreich, K. (2017). A Physical Surface Roughness Model and Its Applications. IEEE Transactions on Microwave Theory and Techniques. https://dx.doi.org/10.1109/TMTT.2017.2695192

MLA:
Gold, Gerald, and Klaus Helmreich. "A Physical Surface Roughness Model and Its Applications." IEEE Transactions on Microwave Theory and Techniques (2017).

BibTeX: 

Last updated on 2018-11-08 at 02:45