This book consists of an analysis of the theory, properties and the technological applications of metamaterials for the development of new devices like invisibility cloaks, absorbers and concentrators of EM waves, etc. For developing a new device, it is important to know the electrodynamic features of the metamaterial according to which the device is created. The electromagnetic metamaterials affect EM waves and regulate the surrounding electromagnetic field by changing their permeability characteristics. It is this feature which enables the creation of electromagnetic wave scattering surfaces which utilize metamaterials. This book discusses various aspects related to metamaterials and will be beneficial for both students and experts interested in this field.