This book is primarily targeted to the young engineers and researchers who are planning to start their early careers in the field of reconfigurable antenna designs; and also at the experienced scientists, who are planning to keep themselves updated on the state-of-the- art designs in reconfigurable antennas. This book would serve as a single platform wherein the discussion would range from the basic design methodology to advanced designs, and current work scenarios. The book aims at covering the basic designs and methodology of reconfigurable antennas, to the recent developments in the field of reconfigurable antennas, metasurface-based reconfigurable designs, reflectarray and transmitarray based structures, and liquid-based reconfigurable antennas.Part of IOP Series in Electromagnetics and Metamaterials.