Abstract
In this paper, frequency selective surface (FSS) with low profile, miniaturized structure and closely located dual-band is proposed based on the fractal technology. The FSS is designed by etching the conductive pattern on a single layer substrate. Two fractal slots are designed to increase the spatial efficiency of the pattern and provide two isolated resonances. For the dual-band FSS, the miniaturization should work for both of the resonances to keep the frequency ratio. Therefore, the slots are convoluted as different principles and twisted with each other to keep the miniaturization and isolation. With the third-order fractal pattern, two pass-bands are achieved at 1.04 GHz and 1.49 GHz with the frequency ratio of 1.42. The dimension of the element is as compact as 0.039λ× 0.039λ where λ is the wavelength of low frequency resonance. Moreover, benefiting from the miniaturized element, the angular stability is very good that the resonances keep stable when the incident angle increasing from 0° to 60°. In order to get insight of the mechanism of the proposed element, an equivalent circuit model is established and studied. A prototype is fabricated and all the proposed performances are verified by simulations and measurements.
Highlights
Frequency selective surface (FSS) is a kind of periodic structures with arbitrary shapes, it can exhibit reflection or transmission characteristics at a certain frequency, which works as a spatial filter for the incident electromagnetic waves [1]
FSS with compact structure, low profile and highly isolated dual-band is proposed in this paper
Novel convoluting principles are applied in the third-order pattern to achieve low frequency ratio and high isolation between the dual resonances
Summary
Frequency selective surface (FSS) is a kind of periodic structures with arbitrary shapes, it can exhibit reflection or transmission characteristics at a certain frequency, which works as a spatial filter for the incident electromagnetic waves [1]. FSS has caused extensive research for its widely applications in hybrid radomes, antenna sub-reflectors, absorbers, electromagnetic shields, etc. With the increasing demands of wireless communication and radar systems working on multiple transmission bands, multi-band FSS have attracted much attention, which can provide much more exact electrical windows in frequency domain [9]. As a common structural requirement, the dimension of the FSS element should be compact enough to arrange a sufficient number of elements in a finite space and to suppress the appearance grid lobes.
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