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This paper explains about how a frequency modulated continuous wave (FMCW) standard system in Advanced Design System (ADS) software is implemented for ground penetrating radar (GPR) experiments using the built-in Design Guide as reference. At the moment, there is no model created especially for GPR investigation in ADS. Therefore, the purpose of this paper is to give an idea on how GPR experiment results can be simulated and analyzed without having to perform the actual experiment. Simulations have been done in ADS to see how the components change affects the baseband spectrum. The final circuit system was designed based on the spectrum line stability.