A Finite Element Method to Model Transmission Lines with Various Rough Conductor Surfaces up to 110 GHz

This paper presents a new procedure to characterize frequently utilized transmission lines with conductors having different surfaces with various roughness. Static finite element electromagnetic field calculations are combined with available dynamic formulas for line characterization up to 110 GHz. Simulation results of microstrip lines obtained with this method are compared with results from established simulation software as well as their corresponding measurements. With this easy and fast method, the need for full-wave analysis considering surface roughness of common transmission lines gets obsolete.