Wearable antennas have been increasingly popular in recent years due to their small size, high efficiency, attractive data transmission features, and compatibility with modern communication systems. In order to make communications devices that are compact and comfortable to wear, researchers have tended to reduce antenna components, taking into account antenna efficiency and bandwidth. This book aims to design a new type of micro-antenna suitable for the 5th generation of communication devices worn by the user, as part of the efforts to develop the concept of "Internet of Things", which aims to link the various devices that humans use in their daily lives through the Internet. To make the antenna suitable for wearable applications, it must be lightweight, small, and convenient for use as health monitors. The use of Electromagnetic Band Gaps (EBG) structures in antenna design is becoming more and more popular in the antenna community. Due to its unique properties in improving antenna performance and suppressing surface waves in the antenna's ground plane while increasing antenna gain.