Convoluted Frequency Selective Surface Wallpaper to Block the Industrial, Scientific, and Medical Radio Bands Inside Buildings

Abstract

This paper reports some of the findings in a project done at Al-Ahliyya Amman University in Jordan. The project was to create a band-stop square loop and convoluted frequency selective surface (FSS) wallpaper. FSS wallpaper as a state of the art that may be applicable on wall to block Wi-Fi frequency working on the 2.4GHz frequency inside buildings by blocking all unwanted outdoor transmissions, regardless their origin (Taylor et al., 2011). The convoluted FSS differs from the designed square loop FSS, by getting a better performance in presence of different incident angles of the propagating wave (0o-60o) and to reach a stable resonance frequency for both a transverse electric (TE) and a transverse magnetic (TM) incident waves. The designed FSS is used to modify the indoor wireless physical propagation environment and reducing the interference level which enhancing the network security with in the buldings in the unlicensed 2.4GHz, as industrial, scientific, and medical (ISM) radio bands (Sung et al., 2006).