Metamaterial-FSS for THz Applications

Abstract

This chapter provides an overview of the metamaterial-Frequency Selective Surfaces (FSSs) for terahertz (THz) applications. In order to support various next generation wireless applications, the demand of the high data rate capacity systems keeps on increasing day by day. Lower frequency ranges such as microwave frequency bands offer smaller bandwidth, and these bands are already congested because of supporting the several wireless applications. To achieve a higher data rate, larger bandwidth is required, which can be obtained at high frequency, i.e., utilizing THz band. In this chapter, first, the electromagnetic spectrum is discussed with the focus of THz bands and its applications. Frequency selective surfaces (FSSs) are currently an active area of research due to their capability to manipulate the EM waves and unprecedented features. FSSs act as spatial filters, i.e., some particular band of frequency is transmitted, and others are reflected and found a wide applications in communications, radar systems, and sensing. However, traditional FSSs have the unit elements sizes which are in the order of half-wavelength at frequency of operation, which limit its applications, and hence they need to be miniaturized for use in various applications with better performances. Electromagnetic metamaterials are the man-made structures exhibiting the unique electromagnetic characteristics, which do not occur naturally. Recently, metamaterial has shown its capability toward the miniaturization of the microwave structures as well the antennas. In this regard, metamaterial concept plays a vital role in the miniaturization of the FSS by using subwavelength unit elements. Here, a brief overview of the metamaterial inspired FSS is discussed in detail. In the last, simulation setup and design flow for designing FSS using EM simulator such as HFSS and CST are described.