Fundamentals of Electromagnetic Wave Absorbers

Summary

This chapter discusses basic matters on electromagnetic (EM)‐wave absorbers from various perspectives. As is well known, EM‐wave absorbers are classified according to various factors such as the structure, the material to be used, and the frequency band to be applied. The chapter explains the wave absorbers related to an incident wave radiated from a far oscillator, that is, the absorber against a plane wave case. It provides the examples of the main application of the wave absorber and the related materials used therein. The EM‐wave absorber application fields are expanding along with the development of communication technologies. With respect to the wave absorbers of the anechoic chamber, many studies have been conducted, and much research that incorporates the latest analysis has been published. For example, with respect to the pyramid‐type or wedge absorbers, research based on theory and experiments, the moment method, and the frequency‐domain finite‐difference method have been reported.