Abstract
Owing to the continuous growth of THz absorber, it finds applications in multidimensional fields such as wireless communication, biomedical, military, and defense. These absorbers play a crucial role in RF imaging system design, mutual coupling reduction in antenna array systems, and RCS reduction applications. In this chapter, we begin with defining the THz band, EM wave absorbers, FSS, metamaterial, and impedance matching. Then, we showcase how FSS and metamaterials play a vital role in the design of absorbers. Further, we classify THz absorbers as FSS, resistive sheets, flexible, and graphene-based absorbers showcasing their working principles. Then, we differentiate THz absorber fabrication techniques, including conventional UV lithography and advanced nano-fabrication technology. The chapter concludes by highlighting different types of absorbance measurement techniques such as THz time-domain spectroscopy, waveguide setup, and anechoic chambers in detail, along with their advantages and limitations.
