Spatial Angular Filtering by FSSs Made of Chains of Interconnected SRRs and CSRRs

Abstract

Two frequency selective surfaces (FSSs) made of an infinite set of parallel 1-D chains of interconnected split ring resonators (I-SRRs) and interconnected complementary split ring resonators (I-CSRRs) are studied. The main result was that the central frequencies of the stopband and passband can be strongly tuned by controlling the angle of incidence.

Design, concepts, and applications of electromagnetic metasurfaces

“…This includes metasurfaces producing beams possessing angular orbital momentum [57] or vortex waves [58][59][60][61][62][63], holograms [64,65], and stable beam traction [66]. Additionally, nonreciprocal transformations [67][68][69][70][71], nonlinear interactions [72][73][74], analog computing [75,76], and spatial filtering [77][78][79] have also been reported.…”

Synthesis of Spherical Metasurfaces Based on Susceptibility Tensor GSTCs

“…This leaves out 8 complex susceptibility parameters (among which one must ensure χ em ‰ 0 and χ me ‰ 0), which further reduces to 4 complex susceptibility parameters if one cares for only one polarization (and the transformation of the other polarization is arbitrary). In this case, we also have two equations in (9) disappearing, reducing the total number of equations from 4 to 2. In the case of θ-polarization, we have then 2 equations for the remaining parameters are χ θθ ee , χ φφ mm , χ θφ em and χ φθ me .…”

“…where the subscripts 1 and 2 correspond to the two transformations. The double transformation in (17) involves only 2 of the 4 equations in (9), and is hence a reduced-rank (from 4 to 2) transformation.…”

“…We shall now consider the case of a transformation with specifications for both polarizations. This leads to a full-rank system, involving the 4 equations in (9) and, without non-gyrotropy constraint, 16 unknowns. Using approach 1, we further specify here monoanisotropy, which leads, using the short-cut notationχ ee " jω 0 χ ee and χ mm " jωµ 0 χ mm , to the system…”

Design of a Compact Passband Frequency Selective Surface with Stable Resonance

“…In a comparison of traditional filters, the frequency selective surfaces (FSS) can perform a significant role in either stopping or passing the spectral behavior depending on the type of array element. These surfaces find a wide variety of applications such as spatial angular filters [2], frequency reuse reflector antennas [3], and radomes [4] in microwave and optics. The FSS usually consists of two-dimensional infinite extent periodic array of conducting metal patches or aperture elements on one side of the dielectric slab.…”