While moving towards a ubiquitous society where anyone can get information from anywhere at anytime, antennas are becoming a key component for cellular handsets and other portable wireless devices. Users of portable wireless devices want such devices to be of small volume, light weight, low cost, and working with the different worldwide communication standards. Due to enormous increase in the number of cellular handset users around the world, many questions are raised about the possible hazard effect of the cellular handset electromagnetic field (EMF) radiation. Thereby, health concerns regarding the use of a cellular handset near the human head have been growing and took a lot of attention by researchers. This book, therefore, investigates the design of multi-band antennas for cellular handsets, and the coupling between these antennas and human body with the factors that may influence this coupling. The contents of this book should be helpful to practicing engineers, graduate students, and professors engaging in designing multi-band antennas and evaluating their coupling with human body, or anyone else who may be interesting in evaluating the cell phone thermal effect.