The Angular Stability of a Miniaturized Frequency Selective Surface Wi-Fi Protection Shield

A dual band FSS for Wi-Fi (2.45 GHz and 5.2 GHz) protection shield was designed by using the proposed method based on the metamaterial theory. The S
₂₁
frequency characteristics of the two FSSs were compared both analytically and experimentally by changing the incident angles of EM waves. This confirmed that the angular dependency of the S
₂₁
frequency characteristics of the proposed FSS is more stable than that of a conventional double loop FSS, as shown by electromagnetic analysis and experiment, confirming the validity of the proposed method and the feasibility of the FSS.