In response to the continuous innovation in the field driven by the rapid development of mobile communication, this book systematically explores the technologies and applications of mobile terminal antennas. It presents the fundamental theories, design methodologies, and physical implementations of mobile terminal antennas across a wide spectrum of configurations. The book thoroughly examines single-, dual-, and multi-antenna configurations for 5G mobile terminals, as well as single-, dual-, and multi-band designs. It also covers fixed single-beam and reconfigurable multi-beam technologies. The content is enhanced by numerous practical design examples featuring broadband miniaturized antennas, sub-6 GHz antennas, and millimeter-wave phased array antennas. These examples provide the theoretical foundations and technical references that are essential for designing advanced 5G mobile terminal antennas. This book will be an invaluable resource for R&D engineers and university students and researchers in electronic and communication engineering specializing in mobile terminal antennas. Professionals in the mobile terminal antenna industry will find it to be an authoritative training manual and reference guide.