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.
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