Abstract—Short-range communication systems have chosen the 60 GHz spectrum to fulfill consumers’ demands for high data speeds. This frequency, nevertheless, is diminished by obstructions. This work aims to overcome the constraints of the 60 GHz band by enhancing interior surroundings through the implementation of Square Loop (SL) Frequency Selective Surfaces (FSSs) wallpaper, consequently maximizing its efficiency. Analyzed utilizing both MATLAB and CST Studio Suite tools, the response of the SL FSS wallpaper at a frequency of 61.5 GHz has been examined. The software ‘Wireless InSite’ is also utilized to showcase the improved transmission of waves within a building that has been altered with SL FSSs wallpaper. The demonstration is conducted on single input single output and multiple input multiple output systems to validate the efficacy of FSSs in enhancing the capacity of such systems, as well as to assess the impact of the human body on capacity. The simulation findings demonstrate that the use of SL FSS wallpaper to remodel a structure is an appealing approach to greatly enhancing the interior 60 GHz wireless communications band. This research additionally introduces and contrasts two extensive indoor propagation route loss models: the Close-In (CI) free space reference distance model and the floating intercept (FI) model. Analyzed data is derived from ‘Wireless InSite’ at distances ranging from 4 to 14.31 m. The results indicate that the CI model offers accurate estimation and demonstrates consistent behavior across all frequencies and distances. Furthermore, compared to the FI model, the CI model boasts a strong physical foundation and lower computational complexity.