A Convoluted Frequency Selective Surface for Wideband Communication Applications

Ultraminiaturised Polarisation Selective Surface (PSS) for dual‐band Wi‐Fi and WLAN shielding applications

“…Spatial filters, also referred to as frequency selective surfaces (FSSs), are among the widely adopted and useful technique that can overcome EMI. FSSs are one‐ or two‐dimensional (1D or 2D) periodic arrays of identical metallic elements either printed on a dielectric substrate [1–15] or milled into a metallic surface. The FSS selectively rejects the undesired frequencies while acting transparent for the rest of the spectrum.…”

“…Numerous configurations of compact FSS and a few PSS have been presented in the existing literature so far to secure environment from unwanted EM radiations. Single configuration, multilayer topology, meandered structures, convoluted, and fractal shapes in the FSS are among widely reported FSS types adopted to reduce the size of a unit cell [11–13]. For instance, Ferreira et al [14] have presented a single‐layer quarter ring FSS for dual‐band Wi‐Fi shielding applications.…”

“…The Elucidation in the light of [11–28] reveals that large periodicity of the unit cells has put up significant challenges for the research community, whereas miniaturisation of the unit cell is highly desirable. Furthermore, the handful reports of the existing PSS are limited to only single‐band operation and thus cannot be employed for multiband applications except [28], which is bulky in nature.…”

Polarization insensitive penta‐bandstop frequency selective surface for closely placed bands

“…[2][3][4] Other than conventional methods such as metallic enclosure and foils, spatial filters also referred to as frequency selective surfaces (FSS) have been employed to secure the location from unwanted radio signals. [5][6][7][8][9][10][11][12][13] Existing research on FSS structures has been reported for either tri-bands, quad-bands, or wideband 11 suppression, however, only a few designs have been reported so far that have the capability to suppress five bands in close spectral proximity. 10,14 A quad-band dielectric less FSS design is proposed in.…”

“…Numerous efforts have been carried out to address the radiation hazards to humans as well as the presence of undesired radio bands in these localities 2‐4 . Other than conventional methods such as metallic enclosure and foils, spatial filters also referred to as frequency selective surfaces (FSS) have been employed to secure the location from unwanted radio signals 5‐13 …”