This book aims to cover a new emerging need in designing digital phase shifter for modern communication systems. With the advancement of new generation mobile communication systems, directed beams of antenna arrays save a substantial amount of power as well as improve the communication quality. In this regard, beam-forming circuits, such as digital phase shifters (DPS) constitute essential parts of the antenna array systems. Therefore, this book is devoted to the design of digital phase shifters for various communications systems. Nowadays, phase array systems demand compact phase shifters suitable for chip implementation with wide phase-range and broad frequency band. Each chapter of this book is organized as stand-alone in such a way that the reader requires no specific background acquired from the other chapters. For each phase shifter topology introduced in this book, the reader is furnished with explicit design equations to construct the circuit under consideration. Furthermore, design equations are programmed using MATLAB to assess the electrical performance of the phase shifters with ideal and lossy components. MATLAB design programs are given at the and of each chapter as appendices and provided as soft copy on the web page of the book. In chapters 12 and 14, MMIC layouts for the lattice and T-section based DPS are provided for the readers. It is hoped that an interested reader can immediately identifies the “optimum phase shifter topology” for the need under consideration with its estimated electric performance.

J. N. Srivastava, PhD, has over 20 years of experience in teaching undergraduate, postgraduate, and PhD classes on plant pathology as Associate Professor cum Senior Scientist at Bihar Agricultural University, India, and as Assistant Professor/Jr. at Sher-e-Kashmir University of Agriculture Sciences and Technology, India. In addition to teaching and research, he is also engaged in various agriculture extension activities, such as farm advisory services, and has acted as principal investigator and co-principal investigator for several projects on biological control/integrated disease management. A prolific author, Dr. Srivastava has published many research papers in both Indian and international journals, book chapters, extension articles, practical and technical bulletins, and leaflets.

A. K. Singh, PhD, is Assistant Professor in the Division of Plant Pathology at Sher-e-Kashmir University of Agricultural Sciences and Technology, Jammu and Kashmir, India. He has been engaged for more than 12 years in teaching (both undergraduate and postgraduate levels) and research and is involved in the transfer of technology through different extension activities. He has published more than 30 research papers in national and international journals, one practical manual, and several book chapters and popular articles and has presented many research papers at international, national, and regional symposiums and seminars.