Waveguide Junction Circulators: Theory and Practice

Waveguide Junction Circulators brings together for the first time all the design aspects of this class of device. In a typical application the circulator allows a single antenna to be used for both transmission and reception. Together with semiconductor, passive and electronic devices, the circulator constitutes an essential building block in modern radar, satellite and telecommunication equipment. Features include: * Examination of the properties and adjustments of the 3-port junction circulator and focus on the gyromagnetic resonator * Description of the design of practical classic circulator arrangements * Discussion of aspects of filter theory in the design of the classic 3-port junction circulator * Consideration of practical concerns such as insertion loss and commercial specifications Written by a leading academic authority and experienced industrial consultant, Waveguide Junction Circulators is a vital information source for designers working in microwave engineering. This valuable guide provides the academic researcher with a firm foundation in the theoretical aspects of this class of device whilst offering the industrial engineer an experimental platform for commercial design.

Table of Contents:
Preface ix 1 Architecture of Symmetrical Waveguide Junction Circulators 1 2 Scattering Matrix of m-Port Circulator 23 3 Eigenvalue Adjustment pf 3-Port Circulator 39 4 Impedance Matrix of Junction Circulator 57 5 The Post Gyromagnetic Resonator 77 6 Okada Resonator 89 7 Isotropic, Anisotropic and Gyromagnetic Circular Waveguides 109 8 Isotropic, Anisotropic Open Circular Wavelengths 139 9 The Dialectric Cavity Resonator 155 10 The Gyromagnetic Cavity Resonator 179 11 Impedance in Rectangular, Ridge and Radial Waveguides 199 12 Junction Circular Using Post Resonators 229 13 Complex Gyrator Circuit of a Waveguide Junction Circulator using an Okada Resonator 255 14 Degree-1 and 2 Okada Circulators 279 15 An Evanescent Mode Okada Junction Circulator 297 16 Complex Gyrator Circuit of an H-Plane Junction Circulator using an Okada Resonator 311 17 Complex Gyrator Circuit of an Evanescent-Mode E-Plane Junction Circulator using H-Plane Turnstile Resonators 339 18 Waveguide Circulators using Triangular and Prism Resonators 359 19 Synthesis of Quarter-Wave Coupled Junction Circulators with Degrees 1 and 2 Complex Gyrator Circuits 379 20 The 4-Port Single Junction Waveguide Circulator 399 21 Microwave Switching using Junction Circulators 431 22 Insertion Loss of Waveguide Circulators 431 23 Synthesis of Stepped Impedance Transducers 445 24 Experimental Evaluation of Junction Circulators 471 25 Circulator Specifications 489 26 Gyromagnetic Effect in Magnetic Insulator 511 Index 537

About the Author :
Joseph Helszajn,, PhD, is an international authority on non-reciprocal microwave circuits and devices. He has made a significant contribution to the characterization of the complex gyrator circuits and gain-bandwidth products of planar gyromagnetic resonators and other gyromagnetic devices. Professor Helszajn is a Fellow of the Institute of Electrical and Electronic Engineers, the City and Guilds Institute, the Royal Society of Edinburgh and the Royal Academy of Engineering. He previously authored thirteen books, nine of which were published by Wiley.