Many persons deserve warm thanks for making this book a reality. The major part of this book contains the results of more than a decade of research activities performed in my group at POSTECH. I have been fortunate from the support of numerous excellent students, who devote their time and energy to work on Doherty power amplifiers. I would like to express my sincere gratitude to all those people who have worked on Doherty power amplifier. The deliberate work is the basis of this book.

I would like to express my sincere appreciation to all the Academic Press staff involved in this project for their cheerful professionalism and outstanding efforts. Last but not the least, I would like to thank my very nearest family for their patience and understanding during the many days spent working on this book.