The Stripline Circulators
Theory and Practice
Chapter One
Architecture of Symmetrical
Stripline Junction Circulators
1.1 INTRODUCTION
The three-port circulator is a unique nonreciprocal symmetrical junction having one
typical input port, one output port, and one decoupled port. The fundamental definition
of the junction circulator has its origin in energy conservation. It states that the only
matched symmetrical three-port junction corresponds to the definition of the circulator.
A wave incident in such a junction at port 1 is emergent at port 2, one incident at port 2
is emergent at port 3, and so on in a cyclic manner. One possible model of a circulator is
a magnetized ferrite or garnet gyromagnetic resonator having three-fold symmetry connected
or coupled to three transmission lines or waveguides. The purpose of this introductory
chapter is to provide one phenomenological description of the operation of this
sort of device, to summarize some of the more common resonator geometries met in its
construction, and to indicate some of its uses. The introduction of any such r ... read full excerpt from The Stripline Circulators: Theory and Practice ebook
