In this paper, mathematical analysis and numericalcalculations of main parameters of finline structures with finitemetallization thickness and substrate mounting grooves are developedbased on the Method of Lines (MoL). The results obtained provideconfirmation of the validity of the technique used and prove itssimplicity and adequacy for treating different types of planarstructures mainly finline based structures.Unilateral and bilateral finlines including practical parameters, suchas metallization thickness and grooves' depths, have beeninvestigated. The effect of these two parameters have been discussedbased on realistic configurations and the results show that, at higherfrequencies, the grooves supporting the substrate cannot be neglectedand, in addition, their influence is more significant than the effectof finite thickness metallic strips. The isolated finline with morecomplex configuration with a particular interest in applicationsinvolving active components was also analyzed. The obtained resultsconfirm the previous published predictions for these types ofstructures.
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