An analytical study of curved frequency selective surfaces for shielding applications

Abstract

This paper demonstrates an analytical study of different nonplanar frequency selective surfaces (FSSs) for X‐band (8–12 GHz) electromagnetic (EM) shielding applications. A well‐known metallic square loop unit cell is used for the analysis, which is arranged in a periodic pattern on a three‐dimensional (3‐D) printer compatible dielectric substrate. The geometry is wrapped on various kinds of curved surfaces (cylindrical, paraboloid, and hemispherical surfaces) and investigated using the finite element boundary integral (FEBI) technique. The structure exhibits a band stop characteristic with a fractional bandwidth of 62.74% (6.68–12.66 GHz, having transmission coefficient below −10 dB), resonating around 9.53 GHz under different angles of incident EM wave. Finally, the 3‐D printing method is used to fabricate the prototypes for performing laboratory measurements. The simulated and measured results follow each other closely, thereby establishing the proposed technique in realizing nonplanar FSSs.

Development of a Simple Setup to Measure Shielding Effectiveness at Microwave Frequencies

“…The shielding effectiveness, SE , of the chamber can be obtained by considering the ratio of the magnitude of the incident electric field, , to the transmitted electric field, , or the ratio of the magnitude of the incident magnetic field, , to the transmitted magnetic field, , or, alternatively, the ratio of the incident power, , to the magnitude of the transmitted power, [ 20 ].…”

“…where the condition a 2 = 0 can be straightforwardly obtained by closing port 2 with a matched load. The shielding effectiveness, SE, of the chamber can be obtained by considering the ratio of the magnitude of the incident electric field, P T [20].…”

“…Therefore, developing lightweight and cost-effective EMI-shielding materials is necessary to mitigate EMI pollution [ 18 , 19 , 20 ].…”