Ultra-Wideband stands poised to replace any current wireless technology and revolutionize even the SOHO market. UWB is a revolutionary wireless technology for transmitting digital data over a wide spectrum of frequency bands with very low power. Aggressive commercialization efforts of UWB technology are currently in progress. This book describes essentials of Ultra-wideband (UWB) communications systems as well as its target markets such as military, entertainment, and automotive industries. This book introduces UWB communications systems in simple and easy to understand language. It covers the fundamentals for short pulse generation and propagation, regulatory issues, UWB interference concerns, and the applications and potential target markets. It offers a comprehensive background to UWB technology, short pulse generation, UWB antenna concepts, UWB modulation and multiple access techniques as well as UWB applications. This book is for self-study by individuals new to the field of UWB communications. perfect reference for non-technical readers as well as a good study aide for undergraduate students for understanding more technical text books in the field.