Two-dimensional Periodic Structures for Frequency Selection of Signals

Abstract

Two-dimensional (2D) periodic structures of the microwave and terahertz ranges are becoming more and more widespread as the basic elements of instruments and devices for controlling the parameters of electromagnetic signals in radio astronomy, nuclear physics, medical technologies, electronic engineering, instrumentation, and radar technology. They are known in the literature as “Frequency Selective Surfaces” (FSS). Their electrodynamic performance depends not only on the geometric dimensions and physical properties of materials but also on the periodical spacing of their constituent elements. In the case when their dimensions are much less than the wavelength of the incident radiation, they are called “metasurfaces”. This chapter analyzes the effect of dimensions and electrophysical properties of structural materials on the transfer characteristics of frequency-selective surfaces with crossshaped apertures.

Keywords: Complex shaped apertures, Dielectric substrate, Frequency selective surface, Fractional bandwidth, Generalized sheet-transition conditions, Microwave range, Resistive elements, Wave impedance.

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