This book presents a comprehensive approach to antenna designs for various applications, including 5G communication, the internet of things (IoT), and wearable devices. It discusses models, designs, and developments of MIMO antennas, antenna performance measurement, 5G communication challenges and opportunities, and MIMO antennas for LTE/ISM applications.It covers important topics including mmWave antennas, antenna arrays for MIMO applications, reconfigurable/band-notched MIMO antennas, multiband MIMO antennas, wideband MIMO antennas, and fractal-based compact multiband hybrid antennas.FEATURESDiscusses antenna design optimization techniques in detailCovers MIMO antenna performance measurement, multiband MIMO antennas, and wideband MIMO antennasDiscusses modeling, simulation, and specific absorption rate (SAR) analysis of antennasProvides applications including radio-frequency identification (RFID), wearable antennas, and antennas for IoTMultifunctional MIMO Antennas: Fundamentals and