This book provides a practical introduction of integrated passive device (IPD) technology for both undergraduate and graduate students of electronic engineering, electrical engineering, practicing engineers, communication engineering, and other interested students and researchers. There is no need to justify the existence of IPDs; they are the essential building blocks of mobile and wireless communication systems. IPDs play an important role in the front-end RF sections of mobile phones, and have been developed to meet the ever increasing needs of size and cost reduction in microwave applications. The purpose of this book is to provide a practical overview of this integrated passive technology, potential applications, motivations, and the problems associated with IPDs, and to learn the practical design and fabrication methods of IPDs.