Within this Project, the main goal is to find the approximate values of the parasitic elements for 0805 SMD resistors and capacitors as well as 0603 SMD resistors and capacitors when operated on higher frequencies. To achieve the required task, the substrate RT/duroid 5870 (Rogers Corporation) with a printed copper transmission line on it, was used. This transmission line was cut in the middle and the SMD components were fixed on that gap by soldering at both sides. This model was then placed on a solid copper box and attached to the Network Analyzer with the help of connectors. The measurements were taken within the frequency range of 50 MHz and 10 GHz and transferred from the Network Analyzer to the computer (attached to the Network Analyzer) with the help of the ADS (Advanced Design System) software. Finally, compatible circuit models (for resistors and capacitors) were created in ADS by considering all the parasitic elements and the recorded measurements (respective S-parameters) were matched and optimized by using the fitting technique as well as by the different features of ADS.