About the Book
Stripline circulator theory and applications from the world's foremost authority
The stripline junction circulator is a unique three-port non-reciprocal microwave junction used to connect a single antenna to both a transmitter and a receiver. Its operation relies on the interaction between an electron spin in a suitably magnetized insulator with an alternating radio frequency magnetic field. In its simplest form, it consists of a microwave planar gyromagnetic resonator symmetrically coupled by three transmission lines.
This book explores the magnetic interaction involved in the stripline circulator's operation, the nature of the microwave resonator shape, and the network problem that arises in coupling the microwave resonator to the microwave circuit. The stripline circulator is an important device met across a wide range of industries, including wireless, military, radar, and satellite communications. The book's design tables are a unique feature, offering valuable design support.
Written by an international authority on non-reciprocal microwave circuits and devices, the book is organized into logical blocks of chapters that focus on specific effects and circuit aspects of the stripline circulator. Among the highlights of coverage are:
Spatial shape demagnetizing factors of magnetic insulators
Standing wave solutions of wye gyromagnetic planar resonators
Lumped element circulators
Negative permeability tracking and semi-tracking circulators
Four-port single-junction circulators
Fabrication of very weakly and weakly magnetized microstrip circulators
The final chapter explores important and continuing discrepancies between theoretical models and actual practice. For designers building circulators, isolators, and phase shifters; researchers working on the limitation of ferrite devices; and graduate students intending to work in the field, Dr. Helszajn's insights and perspectives are invaluable.
About the Author
Joseph HELSZAJN, PhD, DSc, is a Chartered Engineer and a Fellow of the Institution of Electrical Engineers, the Institute of Electrical and Electronic Engineers, the City and Guilds Institute, the Royal Society of Edinburgh, and the Royal Academy of Engineering. He is the recipient of the 1995 Institution of Electrical Engineers J.J. Thomson Medal and was appointed an Officer of the Order of the British Empire in the 1997 Queen's Birthday Honours List. Dr. Helszajn is the recipient of the honorary degree of Doctor of Engineering from Napier University (2004) and the honorary degree of Doctor of the University from Heriot-Watt University (2007), both located in the United Kingdom.