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.
Highlights
frequency selective surface (FSS) is a kind of periodic artificial electromagnetic surface
Our purpose is to design a low profile miniaturized FSS based on metasurface with high angular stability to against the generation of grating lobe
The simulated results demonstrate that the proposed FSS has merits of polarization-independent, angular-stable and wide stopband performance
Summary
FSS is a kind of periodic artificial electromagnetic surface. Due to its low loss, low cost, low profile and easy conformal, FSS has been widely used in numerous areas such as radomes [1]–[4] rasorbers [5]–[8], antenna reflectors [9]–[12], spatial filters [13]–[16], as well as electromagnetic band gap materials [17]–[19].The operating principle of the traditional FSS is based on resonance. Our purpose is to design a low profile miniaturized FSS based on metasurface with high angular stability to against the generation of grating lobe. The proposed FSS should have wide stopband while the transmission zeros can be adjusted independently.
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