The dynamic science of electromagnetic waves has been described in this comprehensive book. It consists of a vast range of topics connected to logical as well as mathematical solutions of troubles linked to scattering, propagation, radiation, and emission in various mediums. Designs of several devices and their measurement aspects have been introduced. Subjects linked to microwave section, Terahertz, and quasi-optical sections have been discussed. Bi-isotropic metamaterial in optical region has also been discussed thoroughly. Appealing mathematical techniques in frequency domain and time domain for scattering, radiation, forward, as well as, reverse problems and microwave imaging have been briefed. This book will benefit engineers from diverse backgrounds interested in antennas, microwave engineering, and numerical methods.