Angularly Stable Bandpass Frequency Selective Surface Based on Metasurface

Abstract

A novel bandpass frequency selective surface (FSS) working at 2.4 GHz is proposed in this paper based on metasurface with independent-polarization, wide rejection band and good angular stability. The 10-dB upper stopband could cover 3.35-9.4 GHz with a fractional bandwidth of 94.9%. In addition, the filtering response could remain stable under different polarizations and incidence angles. Parameter analysis and equivalent circuit model are illustrated to explain the resonance behavior of the proposed FSS. It is demonstrated that the lower resonant point in the stopband could be tuned independently by changing the length of small rectangular patches in the top layer. While the higher resonant point could be changeable independently by adjusting the diameter of circular gap in the bottom layer. A prototype of the proposed FSS is fabricated and its simulated results are coincided with measurements.

Single-Layer, All-Metallic Metasurface Filter With Nearly 90° Angularly Stable Resonance

“…Achieving angular stability for a broad angular spectrum using only a single layer is challenging, due to the limited degrees of freedom the designer has to match all terms of Y s (ω, θ), presented in (17). In this article, we have presented a design for a single-layer, all-metallic angularly stable metasurface filter based on smooth boundaries element, without the need for dielectric layers.…”

Anisotropic Metasurface With Asymmetric Propagation of Electromagnetic Waves and Enhancements of Antenna Gain

“…Based on the distribution of unit cells, the EM metasurface can be classified into homogeneous and inhomogeneous metasurfaces. A homogenous metasurface consists of identical elements arranged periodically in a twodimensional (2D) plane [1], controlling phase, amplitude, and polarization of EM waves [2]- [5]. In contrast, an inhomogeneous metasurface comprises unit cells with different geometries and predesigned sequences.…”