Abstract
Design of Compact Polarization Insensitive Triple Bandstop Frequency Selective Surface with High Stability under Oblique Incidence
Highlights
Frequency selective surfaces (FSS) have attracted the attention of researchers for their variety of electromagnetic (EM) properties which include their use as bandstop and bandpass filters [1], [2], artificial magnetic conductors [3], polarization converters [4] and reactive impedance surfaces [5]
EM waves are subject to multipath propagation and FSS structures cannot be always put perpendicular to the incident EM waves, stable and unperturbed response is necessary for bandstop FSS under oblique incidence
For FSS structures acting as multiple bandstop filter (BSF), the response under oblique incidence gets worse as it approaches towards grazing angle of ± 90°
Summary
Frequency selective surfaces (FSS) have attracted the attention of researchers for their variety of electromagnetic (EM) properties which include their use as bandstop and bandpass filters [1], [2], artificial magnetic conductors [3], polarization converters [4] and reactive impedance surfaces [5]. In order to satisfy these requirements, multiple bandstop FSS with polarization insensitivity and stability under oblique incidence are seeking attention and have been reported in recent literature [9,10,11,12,13,14,15,16]. For FSS structures acting as multiple bandstop filter (BSF), the response under oblique incidence gets worse as it approaches towards grazing angle of ± 90°. Stable characteristic is limited to, generally, within ± 60° incident angle in case of triple band FSS [12,13,14,15,16]. The proposed design is compared with other previously reported bandstop FSS structures to demonstrate its superior performance under oblique incidence resolving the limitation of using multi-bandstop FSS in varied multipath environment. All the simulations pertaining to the proposed work are carried out using FEM based simulation software ANSYS HFSS v. 15
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